optical.ppt

7/30/2019 optical.ppt

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Kaisar R. Khan

Ph. D (EE) Candidate

University of CentralFlorida


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Believe

Professionalism

Innovation

Integrity Honesty

Patience


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EDUCATION

Ph. D, (Expected date of GraduationFall 2007) University of CentralFlorida

MSEE, The University of Texas at ElPaso

M. Eng, Bangladesh University ofEngineering and Technology, Dhaka.


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Research Area:High speed electronics andOptoelectronics

Major Advisor:

Dr. Thomas Wu

Dept. of ECE, UCF


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JOURNAL PUBLICATIONS1. Kaisar R. Khan, H. Kabir, T.X. Wu, S. M Shamim Hasan

and Mehdi Shadaram. Performance evaluation of Multi-wavelength M-QAM signal transmitted through fiber opticlink with EDFA Journal of Optical Fiber Technology,Elseiver Publication, July 2004, pp 266-274.

2. Md. Kaisar R Khan, FM Atiq, H. Kabir and S. M ShamimHasan, Performance evaluation of 64-MQAM signaltransmitted through fiber optic link with fiber amplifier,November 2003, IEB Journal of Electrical Engineering,Dhaka, Bangladesh.

3. Md. Kaisar R Khan, Q. Ahsan and M. R Bhuiyan,Expected Energy Production Cost of Two Area

interconnected Systems with Jointly Owned Units ElectricPower System Research journal (Elseiver), April 2004.


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CONFERENCEPROCEEDINGS

1. Jie Chen, Kaisar Khan, Thomas X. Wu, M. Auerbach, Larry Mertens, Don Wilson,and Jim Houyouse, RFLoss Measurement of Pipeline Security Monitoring SystemPresented in IEEE APS/URSI annual meeting, July 2005, Washington D.C

2. K. Khan, T. Wu, Y. Lu and S.T. Wu, Liquid Crystal all optical switches, Presentedin IEEE APS/URSI annual meeting, June 2004, Monterey, CA

3. Md. Kaisar R Khan, Q. Ahsan and M. R Bhuiyan, Expected Energy Generation ofTwo Geographically Isolated Area System with Jointly Owned Units, Presentedthird International Conference on Renewable Energy for Sustainable Development,

October 2003,Dhaka, Bangladesh4. K. Khan, M. Rahman , Xiang li and M. Potasek Effects of Pulse Separation and

Bit-Rate in Multi-Terabit/sec All-optical Waveguide Switches Presented at OSAconference on laser and optics, October 5 -9, Tucson, Arizona.

5. Md. Kaisar R Khanand Mehdi Shadaram Performance Evaluation of M-QAMFiber Optic Link with EDFA Proceeding of Communication Systems, Networks andDigital Signal Processing Symposium, July 15-17, 2002, Stafford shire universityUK, pp. 140-143.

6. Md. Kaisar R Khan and Mehdi Shadaram, "Effect of amplified spontaneous

emission noise on the phase of reference signals transmitted through fiberamplifiers," ICAPT 2002, Quebec City, Canada, June 2002.


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PROFESSIONAL TRAINING1. GTA Certification course, Faculty

resources center, UCF, Spring, 20052. Laboratory safety orientation course, UT

El Paso, 2000

3. Management training for the governmentofficers in Bangladesh, Aug. Dec. 1998

4. Two month on job attachment to asatellite earth station at Dhaka,

Bangladesh, May 99 to July 995. Training on SPC digital switching system

in Bangladesh, February 19996. Industrial attachment on video system to

Philips Bangladesh Ltd., Dec 93 to Jan 94


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GRADUATE COURSES

More than twenty graduate courses

taken in the areas of :

1. RF and Optical fiber communication2. Laser and Optoelectronic

3. Semiconductor devices and VLSI

design4. Telecommunication and Networking

5. Wireless communication etc


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PROJECT PROPOSAL1. 189K Digital telephone installation project

in Bangladesh, Submitted to thegovernment of Bangladesh.

2. Dynamic Magneto Transport Effect on

Semiconductor Material, Kaisar Khan andThomas Wu, submitted to SATOP.

3. Remote RF Measurements for PipelineMonitoring, (FloWatch Phase II), Jie Chen,

Kaisar Khan and Thomas Wu, submittedto Emtel, Melbourne, Florida.4. RF sensor design for remote gas pipeline

monitoring system, Kaisar Khan, YupengChen and Thomas Wu, submitted to

Emtel, Melbourne, Florida.


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ResearchActivities


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Lab Procedures:

Optical Communicationand Optoelectronic

Kaisar Khan and Dr. Guifang. Li

CREOL, UCF


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Instrument (I)


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optical filtersAttenuator


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Measurement of NA of OpticalFiber


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Measurement of fiberattenuation


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Observation of interference


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Fiber Optic Link


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Polarization of Light

With halfwave retirder

-1

0

1

2

3

4

5

6

0 8 16 24 32 40 48 56 64 72 80 88 96 104

112

120

128

136

144

152

160

168

176

184

192

200

Angle

Current,uA

Series2


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Diffraction


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Hologram


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E-O Effect

Normalized intensity profile of E-O cell RF spectrum for 1 MHz ac signal (maximum bias)


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Light Source (Laser Diode)

Spectral output of the laser diode,

operating below threshold. (I= 37 mA)Spectral output of the laser diode,

operating at threshold (I=48mA)


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Laser Output Related to BiasCurrent

Optical power measured at the detector v/s bias current


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Liquid Crystal Cell

0

5

10

15

20

25

0.01 1 1.3 1.6 1.9 2.2 2.5 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 7 10

Vrms

Transmitte

dPower(uW)

90 Degree

45 Degree

Commercial LC Cell LC cell manufactured in the lab d = 5 um


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Schematic Diagram For WDM

System


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WDM Signal

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-20

-15

-10

-5

0

150

0

150

3

150

7

151

0

151

3

151

7

152

0

152

3

152

7

153

0

153

3

153

6

154

0

154

3

154

6

155

0

155

3

155

6

156

0

156

3

156

6

156

9

157

3

157

6

157

9

158

3

158

6

158

9

159

3

159

6

159

9

Wavelength, nm

Intensity,

dBm

Odd Even

O/P without Filter

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

150

0

150

3

150

7

151

0

151

3

151

7

152

0

152

3

152

7

153

0

153

3

153

6

154

0

154

3

154

6

155

0

155

3

155

6

156

0

156

3

156

6

156

9

157

3

157

6

157

9

158

3

158

6

158

9

159

3

159

6

159

9

wavelength, nm

Intensity,

dBm

O/P with Filter


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Simulated BER Performance

10 Gbps 40 Gbps


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Liquid Crystal All-OpticalWaveguide Switches

Kaisar Khan, Thomas X. Wu, Yanqing Lu and Shin-Tson Wu

ECE and CREOL,University of Central Florida

Orlando, FL 32816


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Motivation for LC All OpticalSwitch

All optical switches are used for high bit ratedata transfer (continuous or burst).

Also used for optical packet switching. Support switching of soliton pulses.

Use of high nonlinear properties of LC in optical

switching.


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System Requirement

Return to zero (RZ) soliton like pulse.

Existing modulation technique for 10 Gb/s isnon return

to zero (NRZ)

Very narrow soliton pulse width (femtosecond).

N

0k0B01])/ksech[(P)(0,q

P0=Normalized Incident Power

B =Separation Between Adjacent Bit

0=1/e Half Width of pulse intensity


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WG1

WG2

I/P O/P

Switching Technique

N

0k0B01])/ksech[(P)(0,q

Nonlinear Kerr effect: intensity-dependent change inrefractive index.

For low input power the light beam is transferred fromone waveguide to the other.

For high input power the light beam remains in thesame waveguide.

0)(0,q2


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Governing Equation

0]1

)2

*21

*1

(1

)2

2

2

1(

1[

21)

2

2

2

1(

21

1

qqqqqqqqpqi

qqqqq

iq

0]2

)1

*12

*2

(2

)2

1

2

2(

2[

12)

2

1

2

2(

22

2

qqqqqqqqpqi

qqqqq

iq

For WG 1

For WG 2

0

0

21

12

ff

2

Ae

n2


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2-D Pulse Shape forClose Pulse Separation

Overshoot in Pulse Shape due to pulsecoalescence between adjacent pulses

B = 4

0

B = 8

0


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2-D Pulse Shape forWide Pulse Separation

Pulse propagate without coalescence.

B = 15

0

B = 20

0


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Pulse Propagation in SingleCoupling Length

I/P O/P

Waveguide 1 Waveguide 2

Pulse Propagation in Multiple


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Narrow Pulse Separation


Coupling Lengths (I)

B = 4

0B = 8

0



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Wide Pulse

Separation


Coupling Lengths (II)

B = 15

0

B = 20

0


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Transmission Characteristics

1

2

4

56

78

2

)(2

2)(

1

2)(

1)(

1T

qq

q


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Significant Results

Bit rate limits the performance of liquidcrystal all optical switches.

Numerical results show that the bit spacingmust be approximately eight times the pulsewidth in order to avoid interactions betweenadjacent pulses.

Due to short distance Soliton-Soliton

interaction doesnt affect in this case.


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RF loss measurementof pipeline

Kaisar Khan, Jie Chen, Satish Valenkarand Dr. Thomas Wu


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RF loss measurement

RF L M t f G


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RF Loss Measurement of GasPipe (I)

Baseline Test Set Model

Receiver Section (B)Section of Pipe (P)Transmitter Section (A)

g/4Coax to WG transformer

Impedance transformer

Matched

Load

Short

Circuit

RF Loss Measurement of Gas


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RF Loss Measurement of GasPipe (II)

AA

AA

A

SS

SSS

2221

1211

BB

BB

B

SS

SSS

2221

1211

TT

TT

T

SS

SSS

2221

1211

Transmitter Section:

Receiver Section:

Total S-parameter:

where;BA

AABAT

SS

SSSSS

1122

1221111111

1

BA

ABT

SS

SSS

1122

121212

1

BA

BAT

SS

SSS

1122

212121

1

BA

BABBT

SS

SSSSS

1122

1222212222

1

Receiver Section (B)Transmitter Section (A)


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30mm

30mm

30mm

b3b2b1 a3

a2a1

31.4mm

31mm

31.6mm

a1

= 2.5 mm

b1

= 5.75 mm

a2

= 5 mm

b2 = 11.5 mm

a3= 7.5 mm

b3

= 17.3 mm

a4

= 11.4 mm

b4

= 26.25 mmb

4a

4

40mm

33mm

3mm


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Coax Waveguide Adapter Design

Operating frequency: 1.3 GHz

Medium inside the waveguide: Air

Dielectric in coaxial line: Air

Probe depth of

penetration to

launch RF waves

PShort

Circuit 2gL

Theoretical simulation results:

Probe Length L (m)

Reflection(d

B)

Reflection(d

B)

Distance P (m)

Frequency Dependant


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Frequency DependantAttenuation

Jie Chen, Kaisar Khan, Thomas X. Wu, M. Auerbach, Larry Mertens, Don Wilson, andJim Houyouse, RFLoss Measurement of Pipeline Security Monitoring SystemPresented inIEEE APS/URSI annual meeting, July 2005, Washington D.C


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1.2 GHz Transceiver

Design

Kaisar Khan, Yupeng Chen and Dr. L. Marten

UCF and Emtel Inc.

System Overview : Flow


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System Overview : FlowWatch Monitoring System

Breach

PipelineRF signal

Sensor System

Si l/N i ti (SNR) f ti f di t


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Signal/Noise ratio (SNR) as a function of distancefor (a) demonstration system and (b) operational

system

(a) (b)(a) (b)


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Transceiver Block Diagram

RF Amp PA

LNA

IF Amp

Output

Timer

(FPGA) Impedancematching (50 ohm)

BPF

IF: BPF(10MHz)

PeakDetector

LPF ADC DSPFIFO

Limiter

DAC

STC

synthesizer


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Phase Noise in OFLink with EDFA

Kaisar Khan and Dr. Mehdi Shadaram

UT El Paso, TX


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System Block Diagram

1550 nm

Msg.

1:1

Coupler

External

Modulator

Msg. Signal

1:1

CouplerPhoto diode

De-modulator

Laser diode

IsolatorOpt. Pump

1:1

Cou ler


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Optical Amplifier in the link

Power Amplifier

Inline Amplifiers

Receiver Amplifiers

Tx Rx

Tx Rx

Tx Rx

EDFAs Gain Saturation


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EDFA s Gain SaturationCharacteristics

EDFAs Wavelength Dependant


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EDFAs Wavelength DependantGain Characteristics

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-20

-15

-10

-5

0

1500

1503

1506

1509

1512

1515

1518

1520

1523

1526

1529

1532

1535

1538

1541

1544

1547

1549

1552

1555

1558

1561

1564

1567

1570

1573

1576

1578

1581

1584

1587

1590

1593

1596

1599

Wavelength, nm

Intensity,

dBm


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Phase Noise

Md. Kaisar R Khan andMehdi Shadaram, "Effect of amplified spontaneous emission noise on

the phase of reference signals transmitted through fiber amplifiers," ICAPT 2002, Quebec City,Canada, June 2002


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QAM Transmission ThroughOF Link with EDFA

Kaisar Khan and Dr. Mehdi Shadaram

UT El Paso, TX


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System Block Diagram

1550 nm

Msg.

1:1

Cou ler

External

Modulator

M-QAMSi nal

1:1CouplerPhoto diode

M-QAM

Receiver

Laser diode

IsolatorOpt. Pump

1:1

Coupler


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Optical Amplifier in the link

Power Amplifier

Inline Amplifiers

Receiver Amplifiers

Tx Rx

Tx Rx

Tx Rx


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EDFAs Characteristics

EDFAs Wavelength Dependant


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EDFA s Wavelength DependantGain Characteristics

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-40

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-30

-25

-20

-15

-10

-5

0

1500

1503

1506

1509

1512

1515

1518

1520

1523

1526

1529

1532

1535

1538

1541

1544

1547

1549

1552

1555

1558

1561

1564

1567

1570

1573

1576

1578

1581

1584

1587

1590

1593

1596

1599

Wavelength, nm

Intensity,

dBm


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Effect of Link Loss

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-12

-9

-6

-3

0

-35 -30 -25 -20 -15 -10 -5 0 5 10

Po, dBm

log(BER)

L = 10 dB 20 dB 30 dB 40 dB Upper Bound

-15

-13.5

-12

-10.5

-9

-7.5

-6

-4.5

-3

-1.5

0

-35 -30 -25 -20 -15 -10 -5 0 5 10 15

Po, dBm

log(BER)

L = 0 d B 20 d B 4 0 d B 6 0 dB Up per Bo un d


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Effect of Amplifier Position

-15

-13.5

-12

-10.5

-9

-7.5

-6

-4.5

-3

-1.5

0

-35 -30 -25 -20 -15 -10 -5 0 5 10

Po, dBm

log(BER)

Power In-line Rx Upper Bound

-15

-13.5

-12

-10.5

-9

-7.5

-6

-4.5

-3

-1.5

0

-25 -20 -15 -10 -5 0 5 10Po, dBm

log(BER

)

Power In-line Rx Upper Bound

20 dB40 dB


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WDM Application of 16-QAM Signal

Kaisar R. Khan, H. Kabir, T.X. Wu, S. M Shamim Hasan and MehdiShadaram. Performance evaluation of Multi-wavelength M-QAM signaltransmitted through fiber optic link with EDFA Journal of Optical FiberTechnology, Elseiver Publication, July 2004, pp 266-274.


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Significant Results1. ASE noise is the most dominating noise at low and

medium link losses, but at very high link losses thethermal noise becomes as a dominating noise.

2. Higher wavelengths show less degree of saturation andultimately better BER performance ofM-QAM signal.

3. The receiver amplifier performs better than the other twoamplifier positions (power and in-line amplifier) the link athigh link losses, because the amplifier placed at thereceiver end experience less degree of saturation due tolink losses.


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Last mile solution usingFree Space Optics

Kaisar Khan and Yusuf Niaz

June 2003

BTTB, Bangladesh

BER with Random


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BER with RandomIrradiance

dI

dxdx

dIIPIBERBER

x

x

x

II

I

mx

I

mx

I

]exp[

})exp()exp({

)()(

2

22

81

21

21

12

0

20

0

}2)/ln({

22

1

2

)(

)(2

121

2

)(

)(2

121

0

0

})exp()exp({ 21

21

12

0

20

0 2

)(

2

1

2

)(

2

121 dxdxBER

mxmx

20

21

2/101

20

21

21

20

201

21

200110 )}/ln()(2)({1

mmmm

Probability distribution of


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Probability distribution ofthreshold crossing

0

5

10

15

20

25

30

0.1

0.4

0.7 1

1.3

1.6

1.9

2.2

2.5

2.8

3.1

3.4

3.7 4

4.3

4.6

4.9

5.2

5.5

5.8

6.1

6.4

6.7 7

7.3

7.6

7.9

8.2

8.5

8.8

9.1

9.4

9.7 10

tau

Io

Series2

Broadband Access Network( d l )


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Todays access plant is predominantly narrow band

Required for increased capacity & higher speed

Alternative broadband access technologies

New broadband services or applications

(Residential Services)

Access Backbone

Tomorrow

Today

Switch

Narrowband

(64 Kbps)

(The Bottleneck)

Switch/

Router

Broadband

(2-20+ Mbps)

LD Traffic

LD Traffic

VIDEO

VOICE BAND

DATA

VOICE

VOICE / DATA

roa an ccess e wor us nessServices)


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Services)

Services mix

Lower initial deployment cost - Success Base Deployment

Customized Solutions

Security

Metro HubMetro DWDM /

OADM Transport

DSLAM

xDSL

DS3

E3-ATM

TeraLinkTeraLink

Vertical Feeder

Riser Fiber

FT1/DS1/DS3

SONET/SDH/ATM/IP

ServicesLAN-IP Services

Ethernet

IP Services

GBE Services

1, 2, 3 ...1, 2, 3 ...

Service

Distribution

Network

Collector

Ring

Metro Node

Metro Node Metro Node

Metro Node

Office

Complex

Campus

Industrial

Park

Collector

Ring


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Next G Wireless Access


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Limitations of Wireless LAN

Bandwidth small

Shared media

Not Scalable

Poor performance for TCP/IPparticularly for congested network.


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FSO is poised to become a major player in the localbroadband access market, particularly among smalland medium-size businesses, which typically lackfiber connections.


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Key Requirements :

1. Multiprotocol support

2. Scalability

3. Reliability and availability4. Openness

5. Ease of installation and management

6. Size and power consumption7. Cost effectiveness


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C bl TV


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Cable TV


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Distance

< 2 Km is commercially available

> 5 Km in R&D stage

Problem

1. Low SNR due beam focusing

2. Laser beam scintillation due toatmospheric turbulence


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Resources

www. ieee. org

www.ietf.org

www.airfiber.com

www.opticomm.com

www.lightPointe.com
http://www.ietf.org/http://www.airfiber.com/http://www.opticomm.com/http://www.lightpointe.com/http://www.lightpointe.com/http://www.opticomm.com/http://www.airfiber.com/http://www.ietf.org/


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THESIS

Effect of ASE noise on reference and M-QAM signals in afiber-optic link with EDFA, MS thesis at UT El PasoAdvisor: Mehdi Shadaram, Professor and Head, Dept. ofECE, UTEP

Expected energy generation of two area interconnected

system with jointly owned units, M. Eng. thesis at BUETAdvisor: Quamrul Ahsan, Professor and Dean, Faculty ofECE, BUET

Digital design of a dc motor speed controller, senior projectconducted at BIT, Rajsahi


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TEACHING EXPERIENCE

Teach under graduate courses and Labs inthe area of telecommunication,microprocessor, electronic, andnetworking as GTA/AdjunctLecturer/Lecturer for more than 6 years.


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LAB

1. Electronics 2 (EEL4309) at UCF2. Analog Filter Design (EEL 4140 ) at UCF3. Analog Devices Lab (EEL 1070C )at Florida

Technical College4. Measurement Laboratory (EE 221 ), at CCNY5. Tool Skills Laboratory (EM 130) at NY City Tech6. Electronics Laboratory at UTEP7. Microprocessors at UTEP8. Telecomm Laboratory at BUET


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Lecture

1. EEL4205 (Electric Machinery) atUCF

2. EEL 1070C: Analog Devices and

Operation at Florida TechnicalCollege

3. MAT1001:Remedial Math course at

BMCC4. Electromagnetic at BIT , Rajshahi

5. Electrical Machines at BIT, Rajshahi


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GOD

Health

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