Khuech dai Raman.ppt

5/19/2018 Khuech dai Raman.ppt

1/19

Hc vin Cng Ngh Bu ChnhVin Thng

N TT NGHIP I HC ti:

Khuch i Raman trong h thngthng tin quang

Gio vin hngdn: ThS. Nguyn Th Thu NgaSinh vin thchin: Vng Thnh NamLp: D2004VT1

H Ni 12-2008


2/19

NIDUNG N

1. Gii thiu v khuch i quang

2. B khuch i Raman3. ng dng ca khuch i Raman

4. Kt lun


3/19

1. Gii thiu v khuch i

quangNguyn l khuch i quang

Cc tham s khuch i quangng dng ca khuch i quang


4/19

Nguyn l khuch i quang

Da trn hintng pht x kch

thch v khng cc cng hngtrong khuchi


5/19

Cc tham s khuch i quang

khuch i:

Bng thng li:

H s nhiu:

2

1

2 Tv

g

g

in

out

P

PG

out

in

SNRSNRNF


6/19

ng dng khuch i quang


7/19

2. B khuch i Raman

Tn x Raman

Nguyn l b khuch i Raman

Bm v phng trnh tn hiu

Ngun nhiu trong b khuch i Raman

Phn loi


8/19

Tn x Raman

Trng thi kch thch

Trng thi u

Trng thi cui

Photon tn x

a)Tn x Stoke

Photon tn x

Trng thi cui

Trng thi u

Trng thi kch thch

a)Tn x phn Stoke

Nng lng

Tn x Stoke:Tn x phn Stoke:

12

12


9/19

Nguyn l b khuch i Raman

f bm = (E3 E1)/h

f khuch i = (E2 E1)/h

Mc nng lng chuyn (Transition state)

E3

Laser bmTn hiu cnkhuch i

Tn hiu ckhuch i

E

E 1

2 Mc nng lng dao ng (vibration state)

Mc nng lng nn (ground state)


10/19


Tn ti qua mt bng tnrng (ln n 40THz)

Ph thuc phn cc:Gn nh trit tiu khi bmv tn hin phn cc vunggc

Ph khuch i:


11/19


Khuch i Raman n bm

Cng sut bm:Vi bm thun:

Vi bm nghch:Cng sut tn hiu khuch i:

khuch i tn hiu:

)exp()( 0 zPzP pp

)](exp[)( 0 zLPzP pp

)0()()exp()0()( 0 sseffRss PLGLLPgPLP

z

spR

s

s zdzzPgP

zPzG

0)(exp

)0(

)()(


12/19


S dng nhiu laser

bm ti cc bcsng khc nhau

Ph khuch i

rng v tng ibng phng

Khuch i Raman abm:


13/19

Ngun nhiu trong b khuch i Raman

Nhiu tn x Rayleigh kp DRS:

Nhiu do thi gian sng ca electron ti trng thi kch thchngnNhiu pht x t pht ASE

Nhiu do bc sng nh sng bm v nh sng tn hiu gnnhau

Tng ng vi 2 hin tng tn x n: Mt tnx phn x v mt tn x tiKhuch i t pht (ASE) truyn trong hng nghchs c phn x li trong hng thun nh DRS


14/19

Phn loi

Khuch i Raman phn b


15/19

3. ng dng b khuch i Raman

ng dng trong h thng WDM

ng dng vo thit b khuch i quangOPTera Long Haul 1600


16/19

ng dng trong h thng WDM

Khuch i Raman l nn tng cho khuch i cngsut ti c ly di v cc di hot ng ti cc bngtn rng.

Tchbngquang

Ghpbngquang

Khuych i quang bng S

Khuych i quang bng C

Khuych i quang bng L

DRA

Laser bm nhiu

bc sng

Khuch i quang trong h thng DWDM a bng


17/19

ng dng vo thit b khuch i quangOPTera Long Haul 1600

Cc b khuch iRaman DraA vDraB.

tng c c lytruyn dn phathu ngi ta lpthm cc b khuchi Raman. l

cc card DRA.

DRA-B

OUT

(DRA-A)

MON-L

UPG

(DRA-B)

MON-C

DROP OUT

Internal tap

coupler

WDM

coupler

WDM

coupler

Raman AmplifierDRA-A

To Dual Ampli fier To Fiber plant

Connector

Raman Amplifier

S khi card khuch i Raman


18/19

4. Kt lun

Gii thiu chung v khuch i quang

B khuch i Raman

ng dng ca b khuch i Raman


19/19

Em xin chn thnh

cmn!

Khuech dai Raman.ppt

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Transcript of Khuech dai Raman.ppt