Kaisar R. Khan Ph. D (EE) Candidate University of Central Florida
Believe • Professionalism • Innovation • Integrity • Honesty • Patience
EDUCATION • Ph. D, (Expected date of Graduation Fall 2007) University of Central Florida • MSEE, The University of Texas at El Paso • M. Eng, Bangladesh University of Engineering and Technology, Dhaka.
Research Area: High speed electronics and Optoelectronics Major Advisor: Dr. Thomas Wu Dept. of ECE, UCF
JOURNAL PUBLICATIONS • 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 optic link with EDFA” Journal of Optical Fiber Technology, Elseiver Publication, July 2004, pp 266-274. • Md. Kaisar R Khan, FM Atiq, H. Kabir and S. M Shamim Hasan, “Performance evaluation of 64-MQAM signal transmitted through fiber optic link with fiber amplifier”, November 2003, IEB Journal of Electrical Engineering, Dhaka, Bangladesh. • Md. Kaisar R Khan, Q. Ahsan and M. R Bhuiyan, “Expected Energy Production Cost of Two Area interconnected Systems with Jointly Owned Units” Electric Power System Research journal (Elseiver), April 2004.
CONFERENCE PROCEEDINGS • Jie Chen, Kaisar Khan, Thomas X. Wu, M. Auerbach, Larry Mertens, Don Wilson, and Jim Houyouse, “RFLoss Measurement of Pipeline Security Monitoring System” Presented in IEEE APS/URSI annual meeting, July 2005, Washington D.C • K. Khan, T. Wu, Y. Lu and S.T. Wu, “Liquid Crystal all optical switches”, Presented in IEEE APS/URSI annual meeting, June 2004, Monterey, CA • Md. Kaisar R Khan, Q. Ahsan and M. R Bhuiyan, “Expected Energy Generation of Two Geographically Isolated Area System with Jointly Owned Units”, Presented third International Conference on Renewable Energy for Sustainable Development, October 2003,Dhaka, Bangladesh • 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 OSA conference on laser and optics, October 5 -9, Tucson, Arizona. • Md. Kaisar R Khan and Mehdi Shadaram “Performance Evaluation of M-QAM Fiber Optic Link with EDFA” Proceeding of Communication Systems, Networks and Digital Signal Processing Symposium, July 15-17, 2002, Stafford shire university UK, pp. 140-143. • Md. Kaisar R Khan and Mehdi Shadaram, "Effect of amplified spontaneous emission noise on the phase of reference signals transmitted through fiber amplifiers," ICAPT 2002, Quebec City, Canada, June 2002.
PROFESSIONAL TRAINING • GTA Certification course, Faculty resources center, UCF, Spring, 2005 • Laboratory safety orientation course, UT El Paso, 2000 • Management training for the government officers in Bangladesh, Aug. –Dec. 1998 • Two month on job attachment to a satellite earth station at Dhaka, Bangladesh, May 99 to July 99 • Training on SPC digital switching system in Bangladesh, February 1999 • Industrial attachment on video system to Philips Bangladesh Ltd., Dec 93 to Jan 94
GRADUATE COURSES More than twenty graduate courses taken in the areas of : • RF and Optical fiber communication • Laser and Optoelectronic • Semiconductor devices and VLSI design • Telecommunication and Networking • Wireless communication etc
PROJECT PROPOSAL • 189K Digital telephone installation project in Bangladesh, Submitted to the government of Bangladesh. • Dynamic Magneto Transport Effect on Semiconductor Material, Kaisar Khan and Thomas Wu, submitted to SATOP. • Remote RF Measurements for Pipeline Monitoring, (FloWatch Phase II), Jie Chen, Kaisar Khan and Thomas Wu, submitted to Emtel, Melbourne, Florida. • RF sensor design for remote gas pipeline monitoring system, Kaisar Khan, Yupeng Chen and Thomas Wu, submitted to Emtel, Melbourne, Florida.
Lab Procedures:Optical Communication and Optoelectronic Kaisar Khan and Dr. Guifang. Li CREOL, UCF
optical filters Attenuator
E-O Effect RF spectrum for 1 MHz ac signal (maximum bias) Normalized intensity profile of E-O cell
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)
Laser Output Related to Bias Current Optical power measured at the detector v/s bias current
Liquid Crystal Cell Commercial LC Cell LC cell manufactured in the lab d = 5 um
WDM Signal O/P without Filter O/P with Filter
Simulated BER Performance 10 Gbps 40 Gbps
Liquid Crystal All-Optical Waveguide Switches Kaisar Khan, Thomas X. Wu, Yanqing Lu and Shin-Tson Wu ECE and CREOL, University of Central Florida Orlando, FL 32816
Motivation for LC All Optical Switch • All optical switches are used for high bit rate data 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.
System Requirement • Return to zero (RZ) soliton like pulse. Existing modulation technique for 10 Gb/s is non return to zero (NRZ) • Very narrow soliton pulse width (femto second). P0=Normalized Incident Power τB =Separation Between Adjacent Bit τ0=1/e Half Width of pulse intensity
WG1 WG2 I/P O/P Switching Technique • Nonlinear Kerr effect: intensity-dependent change in refractive index. • For low input power the light beam is transferred from one waveguide to the other. • For high input power the light beam remains in the same waveguide.
Governing Equation • For WG 1 • For WG 2
2-D Pulse Shape for Close Pulse Separation Overshoot in Pulse Shape due to pulse coalescence between adjacent pulses τB = 4 τ0 τB = 8 τ0
2-D Pulse Shape forWide Pulse Separation • Pulse propagate without coalescence. τB = 15 τ0 τB = 20 τ0
O/P I/P Pulse Propagation in Single Coupling Length Waveguide 1 Waveguide 2
Narrow Pulse Separation Pulse Propagation in Multiple Coupling Lengths (I) τB = 4 τ0 τB = 8 τ0
Wide Pulse Separation Pulse Propagation in Multiple Coupling Lengths (II) τB = 20 τ0 τB = 15 τ0
Transmission Characteristics 1 2 4 8 7 6 5
Significant Results • Bit rate limits the performance of liquid crystal all optical switches. • Numerical results show that the bit spacing must be approximately eight times the pulse width in order to avoid interactions between adjacent pulses. • Due to short distance Soliton-Soliton interaction doesn’t affect in this case.
RF loss measurement of pipeline Kaisar Khan, Jie Chen, Satish Valenkar and Dr. Thomas Wu
RF Loss Measurement of Gas Pipe (I) • Baseline Test Set Model Impedance transformer Coax to WG transformer g/4 Short Circuit Matched Load Receiver Section (B) Transmitter Section (A) Section of Pipe (P)
Receiver Section (B) Transmitter Section (A) RF Loss Measurement of Gas Pipe (II) • Transmitter Section: • Receiver Section: • Total S-parameter: where;
40mm 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 mm 30mm 30mm 30mm a2 a1 b1 a3 b3 a4 b4 b2 3mm 31.6mm 31mm 31.4mm 33mm
Probe depth of penetration to launch RF waves Short Circuit L 2g P Coax – Waveguide Adapter Design • Operating frequency: 1.3 GHz • Medium inside the waveguide: Air • Dielectric in coaxial line: Air Theoretical simulation results: Reflection (dB) Reflection (dB) Distance P (m) Probe Length L (m)
Frequency Dependant Attenuation Jie Chen, Kaisar Khan, Thomas X. Wu, M. Auerbach, Larry Mertens, Don Wilson, and Jim Houyouse, “RFLoss Measurement of Pipeline Security Monitoring System” Presented in IEEE APS/URSI annual meeting, July 2005, Washington D.C
1.2 GHz Transceiver Design Kaisar Khan, Yupeng Chen and Dr. L. Marten UCF and Emtel Inc.
System Overview : Flow Watch Monitoring System Sensor System Breach Pipeline RF signal