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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
-50
-45
-40
-35
-30
-25
-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
Pulse Propagation in Multiple
Coupling Lengths (I)
B = 4
0B = 8
0
Pulse Propagation in Multiple
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Wide Pulse
Separation
Pulse Propagation in Multiple
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
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
-50
-45
-40
-35
-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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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
-50
-45
-40
-35
-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
-15
-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/7/30/2019 optical.ppt
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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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Priority
GOD
Health
Family
Work and Education
Social Activity
Entertainment