Tai Lieu OptiSystem

8/11/2019 Tai Lieu OptiSystem

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MC LC

BI 1: MY PHT LASER IU CH NGOI ................................................ 1

M u OptiSys_Design ......................... ......................... ......................... ........... 1

Tng quan v Giao din ....................................................................................... 2

S dng Component Library................................................................................ 2

Kt ni cc phn t ..................... ......................... ................................................ 4

Quan st kt qu .................................................................................................. 5

Kt ni cc my quan st ..................................................................................... 7

Cc my quan st v gim st d liu .............................................................. .... 8

Cc tham s ca phn t ......................... ......................... ......................... ......... 10Hin th cc tham s trong layout....................................................................... 10

Thay i n v ca tham s ......................... ......................... ......................... ... 11

Thay i cc mode tham s: biu din s hc .................................................... 11

Cc tham s ca my quan st ........................................................................... 12

Chy m phng ................................................................................................. 13

Hin th kt qu t cc my quan st .................... .............................................. 14

Oscilloscope ...................................................................................................... 14

My phn tch quang ph................................................................................... 15

My quan st tn hiu quang trong min thi gian .............................................. 16

Thu phng v ln vt ......................................................................................... 17

Lu li th ....................... ......................... ......................... ......................... ... 19

Lu kt qu m phng ....................................................................................... 20

BI 2: H THNG CON - M PHNG C PHN CP.................................... 21

Ti file mu ....................................................................................................... 21

To mt h thng con ........................................................................................ 22

To cc cng u ra ........................................................................................... 23

Cc thuc tnh ca h thng con: tn v biu tng ......................................... .. 25

Thm cc tham s ton cc vo h thng con ..................................... ............... 27

S dng cc tham s ton cc ....................... ......................... ......................... ... 28

Thm thnh phn vo Th vin ......................................................................... 30


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To th mc ph trong Th vin ty chnh ...................... ......................... ......... 30

Thm thnh phn vo th vin ....................... ......................... ......................... .. 31

To thm cc cng ...................... ......................... ......................... ..................... 32

Chy m phng ................................................................................................. 34

BI 3: H THNG QUANG THIT K WDM ..................... ......................... .. 35

Tham s ton cc ........................ ......................... .............................................. 35

Thit b pht ...................................................................................................... 35

Nhm tham s ..................... ......................... ......................... ......................... ... 38

Th nghim thit b pht ......................... ......................... ......................... ......... 39

EDFA + si quang ...................... ......................... ......................... ..................... 40

Thu kt qu sau khi tch knh ....................... ......................... ......................... ... 43

Thm b thu ...................................................................................................... 44My o BER ......................... ........................ ......................... ......................... ... 45

Nhp p chut vo my o BER hin th kt qu v hnh ..................... .. 46

hnh v kt qu ...................... ......................... ......................... ..................... 46

Mu BER........................................................................................................... 47

hnh BER 3D ............................................................................................... 48

BI 4: THAM S QUT BER x CNG SUT VO ..................................... .. 50

La chn cc tham s lp bng cch s dng ch Sweep ..................... ......... 51

Thay i s ln qut lp li ................................................................. ............... 51

Thay i cc gi tr qut lp li ..................... ......................... ......................... ... 52

Chy m phng ................................................................................................. 53

Ly kt qu bng cch s dng Graph builder ................................................... 54

Graphs v Views ............................................................................................... 55

Duyt tham s qut lp li ................................................................................. 55

Tng hp th t vic qut lp li ................................. ......................... ......... 56

BI 5: CC PHIN BN THIT K - C TNH EDFA ......................... ......... 58

BI 6 : TI U HA BIN H THNG ....................... ......................... ... 60

BI 7: TI U HA CHIU DI SI EDFA ....................... ......................... .. 63

BI 8: B TN SC S DNG CHO H THNG CON V TP LNH ........ 65

BI 9: THIT K CA MT B KHUCH I BNG THNG RNGRAMAN S DNG H THNG CON................................................................ 71


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Gii thiu tng quan .......................................................................................... 71

nh ngha ngun nhiu line ......................... ......................... ......................... ... 71

nh ngha ca mt h thng ph vi ngun nhiu line ............................ ......... 73

Thit k mt b khuch i Raman vi bng thng tng v phng trong din

rng. .................................................................................................................. 76S dng cc ha 3D tng tc ............................................................. ......... 78

BI 10: TI U HA GI TR TNG PHNG CA B KHUCH IRAMAN BNG THNG RNG ....................................... ......................... ......... 80

Ti u ha chiu di ca si .............................................................................. 80

nh hng ca suy hao si quang ..................................................................... 82


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Gii thiu

Cch hiu qu nht lm quen vi OptiSys_Design l hon thnh cc bi hctrong ti liu ny, ni bn hc cch s dng phn mm bng cch gii quyt cc bitp.

BI 1: MY PHT LASER IU CH NGOI

Bi hc ny hng dn cch to mt my pht s dng Laser iu ch ngoi. Gipbn lm quen vi th vin, cc tham s, trnh bin tp layout, cc cng c quan st.

M u OptiSys_Design bt u OptiSys_Design, t Taskbar :

Start Programs OptiSys_Design 1.0 OptiSys_DesignKhi ti xong, giao din ha ngi dng ca OptiSys_Design s xut hin

Hnh 1 - Giao din ha ngi dng ca OptiSys_Design


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Tng quan v Giao dinNhng phn chnh ca giao din OptiSys_Design gm Layout Editor, ProjectBrowserv Component Library.Layout Editordng nh v cc thnh phn khcnhau, bin tp v to kt ni gia chng. Project Browser tm v tr thng qua Dn hin ti, v c cu mt D n sao cho cc kt qu t c mt cch hiu qu.

Component Librarygip truy xut cc phn t dng cho thit k.

Project Overview dng thu phng cc thnh phn trn Layout. ParameterGroupst chc cc tham s ca cc phn t theo cch , gip cho ngi s dngkhng cn thay i cch tham s nh Bc sng Lasers trong mi phn t. OutputWindowhin th cc thng bo sinh ra trong qu trnh m phng.

Hnh 2 - Cc thnh phn chnh ca giao din ha ngi dng

S dng Component Library v d di y chng ta s thit k my pht iu ch ngoi. a tt c cc phn

t cn thit ra t Component Library. OptiSys_Design cung cp 1 b cc phn tmc nh.

To D n mi, t menu chnh, vo File New

T th vin, vo mc Default Transmitters Optical Sources.

Chn CW Laser 1.0v t n vo vng lm vic bng cch ko th biu tng.


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Hnh 3 Thm mt CW Laser vo layout

T th vin, vo mc Default Transmitters Optical Modulators.

Chn Mach-Zehnder Modulator 1.0v t n vo vng lm vic bng cch koth biu tng.


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Hnh 4 Thm b iu ch Mach-Zehnder vo layout

T th vin, vo mc Default Transmitters Bit Sequence Generators

Chn Pseudo-Random Bit Sequence Generator 1.0v t n vo vng lm vicbng cch ko th biu tng.

T th vin, vo mc Default Transmitters Pulse GeneratorsElectrical.

Chn NRZ Pulse Generator 1.0 v t n vo vng lm vic bng cch ko thbiu tng.

Hnh 5 Thm mt b to dy bit gi ngu nhin v b to xung NRZ vo layout

Kt ni cc phn t gi tn hiu t phn t ny n phn t khc ta phi ni cng u ra ca phn ttrc vi u vo ca phn t sau

Khi kt ni cc phn t, khng th ni nhiu u vo ti cng 1 u ra. Ngha l:

Kt ni cc phn t bng cch click vo cng ca phn t th nht v ko ncng ca phn t tip theo:


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B to dy bit gi ngu nhin n cng u vo b to xung NRZ

Cng ra b to xung NRZ n cng u vo b iu ch Mach-Zehnder

u ra CW laser n u vo b to sng mang the Mach- Zehnder

Hnh 6 Kt ni cc phn t.

Quan st kt quC nhiu cch quan st kt qu trong OptiSys_Design, th mcVisualizers trongComponent Library cho php ngi dng hin th kt qu m phng. Ty vo loi

tn hiu u vo m ta c b hin thi in hoc quang

quan st tn hiu in to ra t b to xung NRZ trong min thi gian, ta c thchn b hin th Oscilloscope Visualizer:

T th vin, vo mc Default Visualizers Electrical

Chnt Oscilloscope Visualizer 1.0v t n vo vng lm vic bng cch ko thbiu tng.


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Hnh 7 Thm my quan st Oscilloscope Visualizer vo layout

Tn hiu quang c th biu din bng cch chn cc my quan st t th vin. quan st tn hiu quang iu ch trong min thi gian ta s dng My phn tch

ph v My quan st tn hiu quang trong min thi gian:

T th vin, vo Default Visualizers Optical

Chn Optical Spectrum Analyzer 1.0 v t n vo vng lm vic bng cch koth biu tng.

Chn Optical Time Domain Visualizer 1.0 v t n vo vng lm vic bngcch ko th biu tng.


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Hnh 8 Thm my quan st quang optical Visualizers vo layout

Kt ni cc my quan st quan st tn hiu t mt phn t, ta phi ni u ra ca phn t ti cng u voca my quan st.

Khi ni cc phn t vi my quan st, c th ni nhiu my quan st ti cng 1cng ra ca phn t.

Ni phn t v my quan st bng cch click vo cng u ra ca phn t v koth ti cng u vo ca my quan st:

u ra ca b to xung NRZ ti cng vo ca Oscilloscope.

u ra ca b Mach-Zehnder ti my phn tch quang v ti my quan st tn hiuquang trn min thi gian.


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Hnh 9 Ni cc my quan st

Cc my quan st v gim st d liuKhi ni 1 my quan st ti u ra ca 1 phn t, OptiSys_Design u tin s chnmt Data Monitor mc nh vo cng ra ca phn t, sau my quan st s ckt ni.

Cc my quan st lun c kt ni ti gim st, l do nhiu my quan st c thcng gn vo 1 cng l do chng cng gn vo cng 1 gim st. Gim st d liuc i din bi hnh ch nht xung quanh cng u ra ca phn t.

Hnh 10 Cc gim st v my quan st


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Cc my quan st x l d liu lu t gim st d liu, ta c th chn thm gim stvo 1 cng m khng cn ni ti 1 my quan st no, gim st s lun lu dliu sau khi qu trnh m phng kt thc. Ngha l nu bn chn mt gim st vomt cng trc khi qu trnh m phng bt u, sau khi m phng xong bn c thni my quan st vo gim st ny m khng cn chy li m phng t u.

T thanh cng c Layout, chn cng c Monitor, con tr chut s chuyn sangmode gim st

Click vo u ra ca phn t CW laser

Click vo thanh cng cLayout tt mode gim st

Hnh 11 To ra mt gim st

Gim st s lu tn hiu ti u ra CW Laser, khng cn tnh ton li h thng nubn mun quan st tn hiu v b qua vic thm my quan st vo cng .

Tuy nhin phi nh thm gim st vo cng


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Hnh 13 Hin th cc tham s trong layout

Thay i n v ca tham sMt s tham s c nhiu n v khc nhau, nh Tn s c th l Hz, THz v Cngsut c th l W, mW hay dBm. Qu trnh chuyn i s din ra t ng.

Nhn Enter hoc click sang khc cp nht gi tr va nhp

Hnh 14 Thay i n v ca tham s

Thay i cc mode tham s: biu din s hcMi tham s c th c 3 mode:Normal, Sweep vScript

Mode Script cho php ngi dng nhp biu din s hc v cng nh truy nhptham s nh ngha ton cc.

Ti CW Laser, click vo thuc tnh Mode.


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T menu danh sch, chn mode Script

Trong mc Value, nhp biu thc 193.1+0.1

Click vo nt Verify Script

Bn s thy gi tr ca biu din dng kch bn bn trong danh sch thng bo tronghp thoi v kt qu bng 193.2

Hnh 15 S dng biu thc s hc

Cc tham s ca my quan st truy nhp n tham s ca my quan st, bn phi chn biu tng v click pvo . S xut hin hp thoi dng quan st cc th v kt qu c to ratrong qu trnh m phng


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Trong trnh bin tp layout, chn biu tng my phn tch quang

Bm chut phi vo n, xut hin mt thc n.

Chn Component properties.

Hnh 16 Truy nhp vo my quan st

Chy m phngOptiSys_Design cho php ngi dng iu khin qu trnh tnh ton theo nhiucch:

Tnh ton ton b d n: nhiu bn thit k, qut lp ton b

Tnh ton bn thit k hin ti: qut lp ton b

Tnh ton ln lp hin ti: ln qut lp hin thi trong bn thit k hin thi

V c bn, ta s tnh ton ton b d n, v ta khng c nhiu bn thit k v khngqut lp.

T thc n File chn Calculate :


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Hnh 17 Chy m phng

T hp thoi tnh ton, chon PLAY bt u qu trnh m phng

Hin th kt qu t cc my quan stp chut vo bt c my quan st no cng u xut hin hp thoi quan stcc th v kt qu to ra t qu trnh m phng. Click p ln na ng hpthoi

OscilloscopeTn hiu in c quan st trong min thi gian s dng oscilloscope

Click p vo my quan st Oscilloscope Visualizer

V OptiSys_Design c th truyn tn hiu v nhiu tch bit, ngi dng c thquan st kt qu tch bit. Trong oscilloscope, ngi dng c th truy nhp tn hiukhng c nhiu, ch nhieux, c tn hiu cng nhiu, hoc tt c mi th trong cng th.


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Hnh 19 My phn tch quang ph (OSA).

My quan st tn hiu quang trong min thi gianTn hiu quang c quan st trong min thi gian s dng my ny

Click p vo My quan st tn hiu quang trong min thi gian

Trong min thi gian, OptiSys_Design s bin dch tn hiu quang v mt phcng su ca nhiu sang nhiu s hc trong min thi gian

S phn cc tn hiu quang c th truy nhp s dng cc th bn di: Cng suttng cng (Total power), Cng sut ca phn cc X v ca phn cc Y. Khi chn

phn cc X hoc Y ngi dng cng c th chn pha hoc Chirp ca tn hiu ca

phn cc ring .


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Hnh 20 - My quan st tn hiu quang trong min thi gian

Thu phng v ln vtC nhiu cng c u gip bn phn tch v xut thng tin t th

Nu my phn tch quang ph hin th qu gn, click p vo n

Chut phi vo pha trn th chn biu tng Zoom, hoc click vo nt vchn cng cZoom

Cng c ny gip cho vic thu phng cc vng trn th


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Hnh 21 Cng c Zoom

Bn c th ln vt tm ra gi tr cho mi im trn th.

Click vo ntMenugc trn bn tri chn ca sInfo

Click vo ntMenugc trn bn tri chn Tracer.

Cng c ln vt cho php bn quan st gi tr ca mi im trn th trong ca sthng tin.


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Hnh 22 Cng c ln vt Tracer

Lu li thBn c th to bng gm cc im vi gi tr mi im thuc th v lu vo 1file, copy th vo clipboard di dng nh bitmap hoc xut ra nhiu nh dngfile chng hn meta file hoc bitmap

Click vo ntMenugc trn bn tri chn Table of Points.

lu d liu di dng file text, trong hp thoi bng lu gi tr cc im clickvo nt Export to file


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Hnh 23 Bng tp hp cc im

Lu kt qu m phngOptiSys_Design cho php ngi dng lu d liu t cc gim st. C ngha l bnc th lu file project vi cc tn hiu t cc gim st, ln tip theo khi bn ti file

project vo, cc my quan st s tnh ton li th v gi tr t cc gim st .

Sau khi qu trnh tnh ton kt thc, vo thc n File chn Save As

Trong hp thoi Save astch vo Save monitor data.

Nh vy tt c kt qu s c lu li.

Hnh 24 Lu li d n v cc kt qu m phng


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BI 2: H THNG CON - M PHNG C PHN CP

Mi h thng con ging nh mt phn t, c biu tng, tham s, cc cng u vo

u ra, tuy nhin chng c xy dng t mt nhm cc phn t hoc nhm cc hthng con khc. Bn c th d dng to mt h thng con bng cch nhm cc phnt trn layout

Cc h thng con s gip bn to ra cc phn t ring da trn th vin m khngcn phi lp trnh, hay t chc layout theo phn cp khi lng phn t cc mckhc nhau kh ln

Hnh 25 M phng s phn cp.

Bi hc ny s ch ra cch to mt h thng con s dng li Laser iu ch ngoi phn trc ca bi 1. Bn s thy quen thuc vi cc h thng con v th vin phnt.

Ti file mu Chn thc n File/Load,


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Hnh 27 Hin th bn trong mt h thng con

quay li h thng chnh, tt h thng con bng cch click chut phi vo vngnn chn Close Subsystemhoc click vo th Main layoutv vn m h thngcon

Hnh 28 ng h thng con

To cc cng u ra Trong thanh cng c layout, chn cng cDraw Output Port,


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nh v con tr gn vi ng bin ti liu, click vo ,

Ni u ra b iu ch Mach-Zehnder Vi cng ca h thng con.

Cng c to ra, nu quay li Main layout ta s thy biu tng u ra ca hthng con. to cc cng u vo ta thc hin th tc tng t. V y l mt

my pht nn trong v d ny khng c phn to cng u vo.

Hnh 29 To cng kt ni cho h thng con


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Bn c th thay i v tr cng bng cch click p vo cng trn h thng con

Hnh 30 Cc thuc tnh ca cng

Cc thuc tnh ca h thng con: tn v biu tngBn c th thay i tn v biu tng ca h thng con bng cch thay i cc thams ca n.

Trong layout chnh, click p vo biu tng h thng con

Trong hp thoi thuc tnh ca h thng con, thay i Label thnh ExternalModulated Transmitter

Bm vo nt OK

Tn ca phn t v th c cp nht.


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Hnh 31 - Thay i tn phn t

thay i biu tng ca h thng con ta c th ti hnh nh ty t mt file no.

Trong layout chnh, click p vo biu tng h thng con,

Trong hp thoi thuc tnh ca h thng con, tch vo tham s Use Image Click vo gi tr ca tham s Filename, x

Bn c th dng tn External.bmp.


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Hnh 32 Thay i biu tng cho phn t

Thm cc tham s ton cc vo h thng conTrong v d ny chng ta c 1 h thng con c tn External Modulated Transmitter,nu ta cn truy nhp bt k tham s no bn trong my pht ny ta phi xem bntrong ca h thng con ny.

thay i gi tr tham s phn t ca h thng con m khng cn xem kin trcbn trong mi ln truy nhp, ta c th to cc tham s ton cc

Trong cc bc tip theo ta s xut cc tham s Cng sut v Tn s ra truy nhpm khng cn xem cu trc bn trong caExternal Modulated Transmitter.

TrongMain layout, click p vo theExternal Modulated Transmitter,

Trong hp thoi thuc tnh click chn ntAdd Param,

Trong hp thoi tham s nhp cc gi tr sau:

o

Name: Frequencyo Type: floating-pointo Category: Maino Minimum value: 100o Maximum value: 200o Current value: 193.1o Units: THz


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Bm vo ntAdd

Tham s Tn s s c thm vo External Modulated Transmitter.

Trong hp thoi thuc tnh click chn nt Add Param,

Trong hp thoi tham s nhp cc gi tr sau:o Name: Powero Type: floating-pointo Category: Maino Minimum value: -100o Maximum value: 30o Current value: 0o Units: dBm

Bm vo ntAdd

Hnh 33: To cc tham s

S dng cc tham s ton cc mc cui ny, chng ta thm 2 tham s vo h thng ph, by gi chng ta

cn to mi lin h gia cc thnh phn bn trong vi cc tham s ton cc

Chn Mun pht ngoi vi v chiu vo trong n

Nhn p vo thnh phn CW Laser

Trong hp thoi properties, chn tham s Frequency

Thay i ch tham s thnh Script

Thit lp n v thnh THz


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Trong khung gi tr tham s, nhp Frequency

Lp li tin trnh trn vi tham s nng lng, nhp Power v khung gi tr thams v thit lp n v l dBm

Hnh 34: S dng cc tham s kiu ch

Bn cng c th chn gi tr tham s v chut phi vo n, t menu mi m ra chothy cc tham s ton cc sn c cho h thng ph

Hnh 35: S dng cc tham s ton cc

Nhn nt OK

ng h thng ph


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Vi cc bc trn, chng ta thit lp cc gi tr tham s cho tn s v nng lngca CW Laser c cc tham s ton cc trong h thng ph di tnFrequency v Power

Hnh 36: Tham s ton cc v cc b

Thm thnh phn vo Th vinTrong th vin ca OptiSys_Design c 2 th mc chnh: Mc nh v Ty chnh.Thnh phn mc nh ca th vin tc l ch c, ngha l bn khng th thm haythay i cc tham s ca thnh phn ny. Th vin ty chnh cho php ngi dng

pht trin th vin v thm vo cc thnh phn. Cc thnh phn mi c th datn cc thnh phn ca th vin mc nh, tuy nhin cn phi mang mt ci nnmi. Ngi dng cng c th to h thng ph trong th vin Ty chnh

Hnh 37: Th vin thnh phn

To th mc ph trong Th vin ty chnh thm mun pht ngoi vi vo Th vin ty chnh, chng ta to mt th mc vitn Transmitters.

Chn th mc Ty chnh trong thnh phn Th vin


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Hnh 39: Thm thnh phn vo th vin ty chnh

To thm cc cng ly tn hiu in t B to xung NRZ bn trong Mun pht ngoi vi, chng ta

c th to thm mt cng ra trong h thng ph.

Nhn vo bn trong Mun pht ngoi vi

To mi mt cng ra trong h thng ph.

Hnh 40: Thm mt cng ra trong h thng ph

Tuy nhin chng ta khng th kt ni u ra ca b to xung vi cng ny v nang ni vi u vo ca Mun Mach-Zehnder. gii quyt vn ny chng ta


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c th sao chp tn hiu t B to xung v kt ni c 2 cng: u vo Mun Mach-Zehnder v u ra H thng ph.

T th vin thnh phn, chn Default > Tools

Chn Fork 1x2 1.0v thay th n trn khng gian lm vic bng cch ko

biu tng t th vin, ri th n vo khng gian lm vicVic sp xp thnh phn tr nn d dng hn nu bn thay i kch thc ca bnthit k. Bn c th thay i kch thc ca bn thit k bng cch nhn Ctrl+Shiftv ko tren nn ca bn thit k thay i kch thc cho ph hp.

Hnh 41: Thm b chia nhnh (Fork) vo h thng ph

Chn v xa kt ni mu xanh gia B to xung v Mun

Kt ni u ra B to xung vi u vo ca b chia nhnh

Kt ni u ra th nht ca b chia nhnh vi u ra ca ca h thng ph. Kt ni u ra cn li ca b chia nhnh vi u vo ca Mun.


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Hnh 42: Mun pht mgoi vi vi 2 u ra

ng h thng ph

Nu bn mun quan st thay i bn to ra trn h thng ph, bn phi xa Munpht ngoi vi t Th vin ty chnh v cp nht th vin bng cch ko th Munpht ngoi vi vi 2 cng t bn thit k.

Chy m phngBn c th kt ni cng ra ca mun pht ngoi vi vi cc thnh phn hoc thit bo lng khc.

Kt ni u ra u tin ca Thit b truyn dn vi xil

Kt ni u ra th 2 n my phn tch ph v my phn tch t tnh theo

thi gian Chy m phng

Cc thit b phn tch s cho ra kt qu v th t cc u ra. Ch rng tn strung tm v nng lng ca thit b pht c inh ngha l cc thng sFrequency v Power.

Hnh 43: Kt qu t Mun truyn dn ngoi vi


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BI 3: H THNG QUANG THIT K WDM

Chng ny s ch ra cch lm th no m phng mt h thng WDM vi 8knh. Bn cng s lm quen vi cc thnh phn trong th vin, nhm thng s cng

nh cc thit b o mi nh: Phn tch Eye/BER.

Tham s ton cc thc hin m phng chng ta s s dng cc tham s mc nh cho Tc bit, di chui v tc ly mu.

Chn File>New

Nhn p vo hnh nn thit k.

Ch tham s ton cc s dng cho m phng:

Tc bit = 2.5Gb/s

di chui: 128 bits

Khe thi gian = 5.12e-08

Hnh 44: Tham s ton cc

Thit b pht

To mt mun laser ngoi vi theo cc bc hng dn bi 1


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Chn cc thnh phn t mun laser ngoi vi

iu chnh kch thc ca bn thit k bng cch nhn Ctrl+Shift, nhn vonn ca bn thit k v ko con tr khp bn thit k.

Sao chp/dn cc thnh phn to ra 8 b pht.

Hnh 45: To 8 b mun pht laser

T th vin thnh phn, chn Default > WDM Multiplexers Library >

Multiplexers Chn WDM Mux 8x1 1.0v thay th n vo khng gian thit k bng cch

ko biu tng t th vin.

Kt ni u ra Mun Mach-Zehnder vi u vo ca b Mux WDM 8x1

Bn cng c th chn la cc gi tr c hin th bng b lc bn trong b Muxbng cch chn Disp trong th Channels ca hp thoi Properties Mux.


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Hnh 46: Hin th cc knh ghp nhiu tn s

T th vin thnh phn, chn Default > Amplifiers Library > Optical > EDFA

Chn EDFA Ideal 1.0 v t n vo khong khng thit k bng cch ko biutng t th vin.

Kt ni u ra b Mux WDM 8x1 vi u vo ca EDFA Ideal

Hnh 47: Thm b khuch i vo B pht


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Nhm tham s nhp gi tr ca tn s vo mi knh bn c th nhn p vo mi CW Laser vnhp gi tr tn s. n gin ha qu trnh nhp liu bn c th s dng Nhmtham s.

Bng nhm tham s cho php bn truy nhp vo cc tham s ph hp trong mphng WDM v d nh Frequency v Power. Ngha l bn khng cn thay i tngthnh phn m s nhp gi tr cho mt lot cc tham s.

T menu chnh, chn View/Parameter group, hoc nhn Ctrl+5.

Hnh 47: Nhm tham s

Trong bng nhm tham s, bn c th can thip vo cc tham s nh: Tc bit,tn s, phin, dng tn hiu u ra, nng lng v tc ly mu. Bn cng c thnhp n v ca nhm tham s bng cch nhp gi tr mi hoc s dng cng c tthanh menu context.

Trong bng nhm tham s, chn ct Value Chut phi vo cng c chn

T menu xut hin, chn Spread

T hp thoi Parameter Group Spread, nhp tn s u tin ca knh vbc nhy: 193.1 v 0.1

Nhn OK


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Gi tr ca cc tn s sau khi cp nht s hin ra 8 tn s ring bit, t 193.1THzn 193.8THz.

Hnh 48: Nhp gi tr tn s

Th nghim thit b pht xc minh cu hnh h thng ca thit k, chng ta s dng mt OSA v mt my

phn tch WDM thu li ph tn hiu v tng nng lng ca mi knh tn s

T th vin thnh phn, chn Default > Visualizers > Optical

Chn Optical Spectrum Analyzer 1.0 v t n vo khng gian thit k bngcch ko th biu tng trong th vin

Kt ni cc thit b o vi u ra ca EDFA

Chy m phng

Nhn p chut vo cc thit b o hin th kt qu v cc th

Bn nn chn hin th ng thi ph ca 8 knh tn hiu, my phn tch WDM scho ra 8 knh song, nng lng trung bnh ca mi knh s vo khong 17dBm

bng thng 0.1nm.


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Hnh 49: Kt qu thu c t cc my phn tch.

EDFA + si quang to ra si kt ni vi b khuch i EDFA, thc hin theo cc bc sau:

T th vin thnh phn, chn Default > Optical > Optical Fibers Library Chn Nonlinear Dispersive Fiber 1.0 v t n vo khng gian thit kt

bng cch ko th biu tng trong th vin.

Trong hp tnh nng Nonlinear Dispersive Fiber, i tham s chiu di thnh80km.

T th vin thnh phn, chn Default > Amplifiers Library > Optical >EDFA

Chn EDFA Ideal 1.0 v t n vo vng lm vic bng cch ko th t thvin.

Kt ni u ra ca si Nonlinear Dispersive vo u vo ca EDFA ideal.


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Hnh 50: Si quang + b khuch i EDFA

tnh ton hiu nng ca h thng da trn s lng si quang v b khuch iEDFA, bn c th s dng b iu khin lp

B iu khin lp cho php bn thit lp s ln tn hiu s truyn qua cc thnh

phn kt ni gia u vo v u ra ca b iu khin lp.

T th vin thnh phn, chn Default > Tools

Chn Loop Control 1.0 v t n vo vng thit k bng cch ko th t thvin

Kt ni EDFA Ideal (u kt ni vo b mux) vo u vo ca b iu khinlp

Kt ni u ra b lp vi si phi tuyn

Kt ni EDFA Ideal (u kt ni vi si quang) vo u vo ca b iukhin lp.

Hnh 51: B iu khin lp


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Tham s Number of loops trong b iu khin lp l s ln tn hiu quay tr litrong vng lp.

Trong tnh nng ca b iu khin lp, thit lp s vng lp ln 3

Hnh 52: Tham s ca b iu khin lp

Ngha l chng ra s truyn tn hiu qua 3x80km = 240km.

T th vin thnh phn, chn Default > WDM multiplexers Library >

Demultiplexes. Chn WDM Demux 1x8 1.0v t n vo vng lm vic bng cch ko th

biu tng trong th vin.

Kt ni u ra b iu khin lp vi u vo ca b Demux 1x8 WDM.

Bn c th cho hin th gi tr tn s ca cc knh ln giao din thit k:


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Hnh 53: Tch knh

Thu kt qu sau khi tch knh xc minh cu hnh h thng ca thit k, chng ta c th s dng OSA, my

phn tch WDM v my phn tch ph thi gian thu c nng lng ca tnhiu theo tn s v thi gian sau khi tch knh.

T th vin thnh phn, chn Default > Visualizers > Optical

Chn Optical Time Domain Visualizers 1.0v t n vo vng lm vicbng cch ko th biu tng trong th vin.

Sao chp my phn tch ph v my thu WDM

Kt ni cc my phn tch vi u vo th nht ca b tch knh (193.1THz)

Chy m phng m phng ny s tn mt cht thi gian.

Nhn p vo cc my phn tch hin th kt qu v hnh.


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Hnh 54: Kt qu m phng t cc my phn tch.

Thm b thu

Pha sau b tch knh, chng ta s lp thm: photodetector, b khuch i in vb lc Bessel

T th vin thnh phn, chn Default > Receivers Library > Photodetectors

Chn Photodetector PIN 1.0v t n vo vng lm vic bng cch ko thbiu tng trong th vin.

T th vin, chn Default > Amplifiers Library > Electrical

Chn Electrical Amplifier 1.0v t n vo vng lm vic bng cch koth biu tng trong th vin.

T th vin, chn Default > Amplifiers Library > Electrical Chn Low Pass Bessel 1.0v t n vo vng lm vic bng cch ko th

biu tng trong th vin.

Kt ni u ra th nht ca b tch knh vo Photodetector PIN

Kt ni u ra ca Photodetector PIN vi u vo ca my khuch i in

Kt ni u ra ca my khuch i in vi u vo b lc

Thit lp li ca b khuch i l 0dB.


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Hnh 55: Thm b thu vo h thng WDM

My o BER tnh ton hiu nng ca h thng chng ta s dng my o t s li bit(BER). Thnh phn ny c th d tnh BER, Q-factor, hiu nng v nhiu

mt. Bn c th m hnh BER v gi tr BER ti mi im trn th mt sdng hnh 3D.

T th vin, chn Default > Amplifiers Library > Electrical

Chn BER Analyzer 1.0v t n vo vng lm vic bng cch koth biu tng trong th vin.

u vo th nht ca my o BER nhn tn hiu nh phn

Kt ni u ra ca b to chui bit gi ngu nhin ti u vo th nhtca my o BER.

u vo th 2 nhn tn hiu nguyn mu ban u, b tr gia tn hiu bnpht v bn thu.

Kt ni u ra

Kt ni u ra ca b to xung NRZ u tin vi u vo th 2 camy o BER.

Kt ni u ra ca b khuch i in ti cng th 3 ca my o BER


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Hnh 56: Kt ni my o BER

Chy m phng qu trnh ny tn mt t thi gian

Nhp p chut vo my o BER hin th kt qu v hnh

hnh v kt qu

Trong my o BER, chn Show Eye Diagram ( hnh mt)

Khi m my o BER bn c th thy cc hnh i km vi hnh mt:

Q-factor: y l gi tr cao nht ca Q-Factor tc thi

Min BER: y l gi tr thp nht ca BER tc thi

Ngng: y l gi tr ngng tc thi cho ta max Q-Factor v min BER

nh: y l nh ca Eye vi gi tr tc thi

Mu BER: khi kch hot, cho ta thy vng m gi tr BER thp hn gi tr ngidng thit lp.


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Hnh 57: hnh phn tch BER

Bn cng c th phn tch cc kt qu chnh t hnh trong khung phn tch: Gitr Q-Factor ln nht, gi tr BER thp nht, m ln nht ca mt, ngng tc

thi ti Max Q-Factor/Min BER.

Hnh 58: Kt qu phn tch BER

Mu BER tnh ton mu BER bn cn chn check box trong khung hin th kt qu BER,hoc bn c th chn tnh nng ny t cc my phn tch.

Chn Mu BER t check box my o s tnh ton li v a ra kt qu, hnhmi

Trong khung hin th BER, chn th BER pattern

Hnh 59: Tnh ton mu BER


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hnh BER 3D tnh ton BER 3D, bn phi cho php tnh ton mu BER v hnh 3D

Chn biu tng my o BER trn thit k

Chut phi vo n, t hp thoi mi m chn Component properties

Chn th BER Patterns

Bt cc thng s tnh ton mu BER v hnh 3D

Nhn OK my s tnh li v a ra hnh mi

Hnh 60: Tnh ton hnh 3D

hnh 3D c tch hp trn th graphs ca project

Trong menu chnh, chn View > Project Browser, hoc nhn Ctrl+2

Trong th Project, chn tip Graphs

T biu cy, chn my o BER

Trin khai biu cy v chn hnh mu BER

Chut phi ln n, t menu mi m ra, chn Quick View


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Hnh 61: hnh 3D ca mu BER


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BI 4: THAM S QUT BER x CNG SUT VO

Cc th tc sau y s ch cho bn cch tng hp cc kt qu t BER/Eye

Analyzer. ( th BER v biu mt). Phn tch kt qu vi cng sut tn hiu

u vo thay i nh s dng phng php qut tham s. Trong bi ny, bn s lmquen vi cc khi nim nh qut tham s (parameter sweeps), to th (graph

builder), kt qu (results), th (graphs) v mn hnh (views).

Trong v d ny, chng ta s thc hin lp li tham s Power(Cng sut) ca phn

t CW Laser. y, ta c File "BER_InputPowerSweep.osd" c chy

to ra kt qu, chng ti s gii thiu cc bc cn thit c c nhng kt qu

vi cc thit k khc nhau.

Hnh 62 - Mu v d v tnh ton BER x Input Power (Cng sut vo)


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La chn cc tham s lp bng cch s dng ch Sweepu tin, chng ta s chn vic lp li tham s Powerbng cch s dng tnh nng

qut tham s (parameter sweep). Chng ta c th tnh ton thit k bng vic s

dng cc gi tr khc nhau ca cng sut u vo:

Kch p vo phn t CW Laser,

Trong cc hp thoi Parameters, kch vo ct Mode ca tham s Power

Chn ch Sweep.

Cc bc ny c m t trong Hnh 63:

Hnh 63 - Thay i ch sang Sweep

Thay i s ln qut lp li xc nh s ln qut lp li bn phi thc hin theo cc bc sau y:

Vo Tab Parameter Sweeps

T menu Design Version. Chn Set Total Sweep Iterations

Nhp vo Total Iterationsgi tr l 10 (Nh vy tng s ln qut l 10)


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Hnh 64: Gn s ln lp

Thay i cc gi tr qut lp liTrong tab Parameter Sweepsbn c th nhp gi tr trc tip vo trong bng, hoc

bn c th thit lp gi tr u v gi cui v sau s dng cng c Sweep

Iterations Spread.

Trong tab Parameter Sweeps, nhp gi tr cng sut u tin l -50

dBm,

Nhp gi cng sut cui cng l 0 dBm,

Chn ton b ct,

Trong menu Tools, chn Sweep Iterations Spread->Linear



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Hnh 65 - Nhp tt c gi tr lp li

Chy m phng

T menu File chn Caculate :

Hnh 66 - Chy m phng


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Ly kt qu bng cch s dng Graph builder to ra mt th biu din BER theo cng sut, bn cn phi truy nhp vo cc

kt qu to ra bi BER Analyzer.

Trong menu Tools, chn Graph builder

Trong cc cng c Graph builder, chn tham sPowerca phn t CW

Laserlm trc X (trong vng X coordinate source)

By gi chn cc kt qu Min. BER t BER Analyzer lm trc Y (trong

vng Y coordinate source).

Nhp chut vo nt Add, th s c b sung vo tab Graph trong

Project Browers

Cc bc ny c m t trong Hnh 67

Hnh 67 - Xy dng th


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Graphs v ViewsSau khi m phng chng ti xy dng cc biu hnh dung BER so vi u

vo in, biu ny l b sung vo tab th trong trnh duyt d n, bn c th

truy cp vo biu ny sau ny th tc.

M Project Browserln (Ctrl +2),

Trong Project Browserchn tab Graphs,

Trong tab Graphs, kch vo "Power vs Min. BER",

Bng cch kch chut phi trn tn th, bn c th chn Quick Viewhoc

Add to View xem th.

Cc bc c m t trong hnh 68:

Hnh 68: Chn tab Quick View v Add to View

Duyt tham s qut lp liBn cng c th m BER visualizer v c c nhng Eye diagrams (biu

mt), th Q factor v BER cho cc ln qut lp li khc nhau.


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Kch p vo BER Analyzer,

Chn Show Eye Diagram,

Trong thanh cng c, thay i Sweep iteration,

Quan st thy trong hnh s thy mi ln lp bn s c c kt qu khc nhau, mimt gi tr tng ng vi mt gi tr cng sut u vo.


Hnh 69 - Duyt qua cc tham s qut lp li, biu mt, v Q-Factor cho mi

gi tr ca cng sut u vo

Tng hp th t vic qut lp liVisualizer c th to ra cc th cho tt c cc ln qut lp li, tuy nhin cc

Visualizer s ch hin th phin qut hin ti khi ngi dng truy cp cc th

bng cch kch p vo n v duyt cc ln lp li khc nhau.


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N c th truy nhp vo cc th ca tt c qut lp li bng cch s dng cc tab

Graphstrong Project Browser.

Vo Project Browser(Ctrl +2),

Chn tab Graphs, Trong tab Graphs, chn cy BER Analyzer 1.0,

La chn t th Q Factor,

Nhp chut phi vo n, sau chn Add to View hoc Quick View

xem.

Quan st trn hnh bn s thy mt mn hnh hin th vi cc th cho tt c cc

ln qut lp li, mi mt ci tng ng vi mt gi tr u vo.


Hnh 70 - Tng hp cc th t cc ln qut lp li khc nhau trong mt hnh


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BI 5: CC PHIN BN THIT K - C TNH EDFA

File mu "EDFA Characterization.osd" cho thy cch s dng OptiSys_Design

vi nhiu phin bn thit k. Trong v d ny, chng ti s m t b khuch i

quang si EDFA bng cch s dng qut cc thng s u vo ca b khuch i.

Hnh 71- EDFA Characterization.osd

V d ny s dng tham s qut khc nhau cho mi phin bn thit k:

Chiu di: Chiu di si EDFA t 1-20 mt.

Cng sut tn hiu vo: Cng sut tn hiu ca CW Laser t -40 n 0 dBm.

Cng sut ngun bm: Cng sut laser bm t 10 n 200 mW.

Bc sng: Bc sng ca CW Laser t 1525-1600 nm.


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Hnh 71 - Cc phin bn thit k EDFA v cc tham s qut

Vi mi phin bn thit k chng ta c ba th th hin cng sut tn hiu u ra

(Output Power), li (Gain) v h s tp m (Noise Figure) vi cc tham s qut.

Ba th c tng hp vo mt hnh, iu ny c ngha chng ti c bn hnh:

li, h s tp m v cng sut ra so vi chiu di, cng sut vo, cng sut ngunbm v bc sng.

Hnh 73: Graphs and Views


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BI 6 : TI U HA BIN H THNG

OptiSys_Design c th ti u ha cc thng s ti a, gim thiu hoc tm gi

tr mc tiu cho kt qu.

iu ny c ngha bn c th ti u ha chiu di si ca EDFA c c li

ti a, tnh ton s suy hao/ li t c v mc tiu Q-Factor (cht lng tn

hiu), gim thiu BER bng cch ti u chiu di ca lin kt,

File mu "System Margin.osd" cho thy lm th no c lng bin h

thng; bin ny cho thy mc thit hi cng sut c th c b sung vo h

thng. Vi mc tiu BER l 10, c ngha l mc tiu Q-Factor bng 6.

Hnh 74 - System Margin.osd

Trong v d ny h thng con (Subsystem) "System under test" l mt h thng

rng. Vic ti u ha s ti u thng s suy hao t phn t Attenuator t c


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mc tiu gi tr Q-Factor t kt qu BER Analyzer. Thng s suy hao s trong bin

h thng l dB.

Hnh 75: Ti u ha tham s

Bn phi hot ti u ha trong hp thoi tnh ton chy ti u.

Hnh 76: hot ti u ha


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Hnh 77 Ly kt qu


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BI 7: TI U HA CHIU DI SI EDFA

File mu "EDFA Fiber Length Optimization.osd" cho cch ti a ha li nh

ti u ha chiu di si EDFA.

Hnh 78 - EDFA Fiber Length Optimization.osd

Trong tab Optimization, bn c th chn cc thuc tnh Optimization truy nhp

vo cc thng s c s dng cho ti u.

Trong v d ny, chng ti tm kim trong khong chiu di ca si t 1 n 20 mt,

gi tr ti a ha li c o t WDM Dual Port Analyzer.


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Hnh 79 - Tham s cho si di ti u ha

Bn phi kch hot ti u ha trong hp thoi tnh ton chy ti u.

Trong v d ny, li ti a t c l 36 dB, v vi chiu di si l 8 mt.

Hnh 80 - Kt qu sau khi tnh ton


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BI 8: B TN SC S DNG CHO H THNG CON V TPLNH

Bi hc ny s minh ha mt m phng n gin v s b tn sc dn n cc khi

nim nh ngha cho H thng con v tp lnh.Tip theo, hy thit lp mt v d vi cc b tr sau y, trong bao gm

Hnh 81 B tn sc trn mt khong lin kt

1.

Mt ngun tin c trch t xung Gauss RZ theo quy tc c ngi sdng xc nh chui bit.

2. Tng cng b khuch i v b lc.

3. SMF v DCF

4. Trong dng b khuch i v b lc.


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5. Quan st tn hiu.

Hy cng chng ti kim tra cc dng sng tn hiu u vo, sau khi SMF v ktthc on tn hiu. Chng ta c th nhn ra rng sau khi SMF cc xung tn hiu bsuy gim, m rng theo cc h s xp x 2 v c s tc ng ng k gia cc k

hiu.

Hnh 82 Tn hiu pht trin trong mt on b tn sc trn mt khong linkt.

By gi chng ti c th s dng cc tnh nng tp lnh mnh hn ca Opticsysnhm trnh s khng cn thit khi phi xc nh li nhng thng s c b tr phthuc vo cc tn hiu trong nhng trng hp tn hiu u vo thay i. Mt trongnhng thng s l bng thng bn trong ca hai b lc. M hp thoi thng s b


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lc v bt Mode ca Bandwidth ti Script. Chut phi vo gi tr v chnBit rate. Sau them 3* c ton b gi tr 3* Bit rate.

Click vo vng lm vic v hin th hp thoi Global parameters. Tng gp i tl bit v tnh ton li. Hnh di y cho thy s khng ph thuc vo tn sc m

rng trong SMF, tn hiu c lu gi mt ln na sau khi hon tt tp lnh, c vngun v hnh dng xung.

Hnh 83 Cc kt qu v tnh ton cc tp lnh ca b tn sc trong khong

lin kt.

Rt c th lin kt n gin ny c th c ch cho vic xy dng H thng akhong rt ln. Trong trng hp n c khuyn khch gi gn n vo mt

h thng con, m sau ny s cho php ti to cng mt kt hp ca cc thnh phnmt cch nhanh chng v hiu qu.

Chng ti to ra mt phin bn thit k mi. Chn Design Version/Add DesignVersion t menu chnh ca Optisys v thay i tn thnh Amplified DispersionCompensating Subsysteam. Sau chng ti sao chp v dn tt c cc thnh phnca phin bn 1 trong n.


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Tip theo, nh th hin bi 2: Subsystems-Hierarchical simulation, chng tichn tt c cc thnh phn, ngoi tr cc ngun tn hiu v b khuch i tngcng (bao gm ton b hoc b qua cc dng tn hiu), chn Create subsystem

bng cch nhp chut phi t menu n. B tr ca chng ti b gy ra thnh cccc tn hiu trc quan ca mt h thng con. u tin chng ta to ra mt cng u

ra trong h thng con bng cch chn Look Inside t menu chut phi v sdng cng c Output port. Sau chng ta c th thay i tn ca cc h thngcon mi cung cp thm thng tin mt ci g , v d: Amplified DispersionCompensated Span, s dng Component Parameters t menu n.

Hnh 84 B tn sc biu din nh mt h thng con

Tip theo, chng ta c th s dng cc h thng con mi c to ra xy dngcc on lin kt ln hn. Chng ta hy to ra mt phin bn thit k v thay i tnca mnh Multi-Span Link. Sau , chng ti sao chp v dn tt c cc thnh

phn ca Amplified Dispersion Compensating Subsystem trong .

By gi chng ta c th sp xp mt h thng khong 3 on bng cch sao chp vdn Amplified Dispersion Compensated Span thnh thnh phn con v lin ktu vo v u ra tng ng.


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Hnh 85 Xy dng mt h ng a khong s dng ngi dung nh ngha hthng con.

By gi chng ta nh ngha mt dng sng phc tp hn v thc hin cc tnh ton.Sau chng ta c th hin th v so snh cc u vo v u ra tn hiu v bin v hnh dng xung.


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Hnh 86 dng sng u vo v u ra ca mt ng dn b tn sc.


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BI 9: THIT K CA MT B KHUCH I BNG THNGRNG RAMAN S DNG H THNG CON.

Gii thiu tng quan

S lng cc knh c trin khai trong h thng ng di DWDM ang nhanhchng tng vt hang tram knh trong band-C (1528-1563 nm) v band-L(1575-1610 nm). Nhu cu ny cho nhiu bng thng l hng tm kim cho cc b khuchi si mi v tinh vi hn m phng trong mt phm vi quang ph rt rng truyn bng thng max trn mt on ng di.

Cc chi tit c th ca hiu ng Raman kch thch cho php mt k thut th v cho thu c s tng din tch phng ca b khuch i bng rng Raman (Y. Emori,K. Tanaka and S. Namiki, Electron. Lett. 35, 1355, 1999). N ch i hi mt cuhnh nhiu bm ph hp v khng da vo b lc thu ng, li che, vv

nh ngha ngun nhiu line giai on u ca h thng bm cho php thit lp mt nhm mi hai iot lazer

bm c Parameterized biu din tn hiu v cc bc sng tip theo v ngun:

Sau chng ti gp knh kt qu qu u ra ca n s dng, v d, hai b gpknh v mt ngun 2x1 kt hp. Cc knh ca cc b ghp phi c iu chnhcho ph hp vi bc sng ca cc my bm, nh i vi trng hp ca mt ghpknh a truy nhp 8x1.


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Hnh 88 B cc ca mt ngun nhiu line

nh ngha ca mt h thng ph vi ngun nhiu lineN s tin dng cho vic s dng kt hp ca cc yu t xc nh c 2 mybm v cc ngun tn hiu ca b khuch i bng rng Raman. Cch d nht t c iu ny l n cc chi tit trong mt h thng ph, m l c s

dng sau ny cho cc ng dng khc nhau vi mt s iu chnh nh cc thng s.

u tin chng ta m mt phin bn thit k mi c tn Multi-Line Sources.

Sau khi to cc h thng con nh trong Creating a Subsystem chng ta sao chpv dn 2 ln. Hai trng hp mi h thng con s c s dng nh ngun tn hiutrong khu vc lm vic 1510 1630 nm. Hy chng ti thay i tn ca cc hthng con tng ng ti Multi-Line Pump 1400 - 1510 nm, Multi-Line Source


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1510 - 1570 nm v Multi-Line Source 1570 - 1630 nm bi mt click duuble vobiu tng ca h v in cc trng Label trong hp thoi tham s.

By gi chng ta cn phi iu chnh cc thng s bn trong ca 2 trng hp trn h thng con s dng chng l ngun tn hiu. Cc bc sau y l cch nhanh

nht lm iu :1.

Nhp chut phi vo biu tng ca Multi-Line Source 1510 - 1570 nm

2. Chn Lock Inside t menu n. Cc chi tit bn trong c hin th tronglayout ca ngi chnh sa.

3. M Parameter groups bng cch nhn t hp phm Ctrl+5.

4. Trong Group t danh sch th xung chn Power, trong Units t danhsch th sung chn dBm.

5.

Bm vo nt Value chn tt c cc gi tr trong ct .

6. Nhp chut phi vo Value v chn Assign multiple t menu n. Tronghp thoi bt ln nhp -10.

Hnh 89 Trin khai nhanh chng vic tng thch cc thng s ca mt ngunnhiu line


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7. Tip theo trong Group t danh sch trt xung chn Frequency, trongUnits t danh sch trt xung chn nm.

8.

Chut phi vo Value v chn Spread t menu n. Trong hp thoihin ra nhp vo gi tr 1510 ca Start Value v 5.2 ca Increment.

Hnh 90 Trin khai nhanh chng vic iu chnh mt nhiu nhiu line n mtvng quang ph mi.

9. Chn Output Signal Type t Group. Nh m t trn Multiple Assign0 t Value ca tham s Parameterized. iu ny c ngha l cc tn hiu

s c to ra vi ph ly mu y , s dng Sampled signal i dinthay v mt Parameterized signal .

10.ng h thng con

11.Lp li cc bc tng t cho cc h thng con tip theo thit lp bc sngngun ca n t 1.572,6-1630 nm v ngun t -10 dBm.

By gi chng ti c cc my bm cn thit v cc tn hiu v c th bt u xydng cc b khuch i Raman.


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Hnh 91 B khuch i Raman ca mt h thng con

Thit k mt b khuch i Raman vi bng thng tng v phng trong dinrng.u tin chng ta m mt phin bn thit k mi c tn l Broadband RamanAmplifier.

Sau chng ti sao chp v dn tt c cc h thng con t phin bn thit k trc vo ci mi. Sau khi thm cc thnh phn b khuch i Raman t th vinthnh phn "Amplifiers", 2x1 kt hp v mt s xung tn hiu OSA chng ti n

cc layout nh sau:


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Hnh 92 Bng thng tng v phng trn di rng ca b khch i Raman.

i vi cc tnh cht ca si khuch i chng ta nhp cc gi tr in hnh ca mtsi SMF-28 v thit lp chiu di ca n ti 40 km.

Tt c mi th by gi thit lp v chng ti bt u tnh ton ca phin bn thitk hin ti. Khi n c hon tt, chng ti c th hin th v phn tch ph tn hiuti cc im khc nhau ca h thng v d nh ngun u ra.


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BI 10: TI U HA GI TR TNG PHNG CA BKHUCH I RAMAN BNG THNG RNG

bng phng ca vic t c ca b khuch i trong si l mt vn quan

trng hng u cho cc h thng WDM. Bi hc ny s chng minh lm th no ti u ha hn na tnh thng nht thu c ca cc b khuch i Raman c mt trong Lesson 9: Design of a broadband Raman amplifier using subsystems.

C rt nhiu thng s nh hng ng k hiu sut ca b khuch i Raman,nhng mt trong nhng iu d dng kim sot nht c l l chiu di si.

Ti u ha chiu di ca siTrc tin chng ta thit lp ch ca tham s "Fiber Lengh" ti "Sweep". Tiptheo chng ta iu chnh s ln lp li n 13 bng cch s dng trnh t cc bcc m t trong Thay i s ln lp li qut.

Tip theo chng ta xc nh phm vi ca cc gi tr cho chiu di cp quang t 10n 40 km, nh trong thay i cc gi tr lp i lp li qu trnh qut.

Hnh 95 Sweeping(qut) chiu di ca khch i Raman tng v phng trnbng thng rng.

Tip theo chng ta phi thm "Results" " Maximal Forward Gain [dB] " v "Forward Gain Flatness [dB] " vo bng hin th kt qu nh trong hnh sau y:


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Hnh 96 La chn kt qu

By gi chng ta thc hin cc tnh ton bng cch kim tra " Calculate alliterations in current design version ". Khi hon tt cc " Results " ca s tab chacc gi tr tng ng ca hai kt qu nh mt chc nng ca cc tham s qut chiudi si.


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Hnh 97 - Kt qu l mt hm ca cc tham s qut chiu di si

N ngay lp tc cho thy rng tng phng ti u


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Hnh 98 Sweeping(qut) suy hao ca si

Sau khi tnh ton chng ti nhn c kt qu nh sau, trong cho thy phngti u v im tng nh tng ng vi h s suy gim 0,22-0,23 dB / km.

Hnh 99 - Kt qu l mt hm ca suy hao si trn cc tham s qut

l thng tin cng hin th v phn tch u ra pha trc tng ph chng thuc cho cc gi tr khc nhau ca suy hao nh trong hnh sau y:


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Hnh 100 - u ra pha trc tng ph l ty thuc vo s suy gim ca cc si

Tai Lieu OptiSystem

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