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Kaisar R. Khan

Kaisar R. Khan

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Kaisar R. Khan

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  1. Kaisar R. Khan Ph. D (EE) Candidate University of Central Florida

  2. Believe • Professionalism • Innovation • Integrity • Honesty • Patience

  3. 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.

  4. Research Area: High speed electronics and Optoelectronics Major Advisor: Dr. Thomas Wu Dept. of ECE, UCF

  5. 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.

  6. 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.

  7. 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

  8. 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

  9. 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.

  10. Research Activities

  11. Lab Procedures:Optical Communication and Optoelectronic Kaisar Khan and Dr. Guifang. Li CREOL, UCF

  12. Instrument (I)

  13. optical filters Attenuator

  14. Measurement of NA of Optical Fiber

  15. Measurement of fiber attenuation

  16. Observation of interference

  17. Fiber Optic Link

  18. Polarization of Light

  19. Diffraction

  20. Hologram

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

  22. 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)

  23. Laser Output Related to Bias Current Optical power measured at the detector v/s bias current

  24. Liquid Crystal Cell Commercial LC Cell LC cell manufactured in the lab d = 5 um

  25. Schematic Diagram For WDM System

  26. WDM Signal O/P without Filter O/P with Filter

  27. Simulated BER Performance 10 Gbps 40 Gbps

  28. 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

  29. 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.

  30. 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

  31. 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.

  32. Governing Equation • For WG 1 • For WG 2

  33. 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

  34. 2-D Pulse Shape forWide Pulse Separation • Pulse propagate without coalescence. τB = 15 τ0 τB = 20 τ0

  35. O/P I/P Pulse Propagation in Single Coupling Length Waveguide 1 Waveguide 2

  36. Narrow Pulse Separation Pulse Propagation in Multiple Coupling Lengths (I) τB = 4 τ0 τB = 8 τ0

  37. Wide Pulse Separation Pulse Propagation in Multiple Coupling Lengths (II) τB = 20 τ0 τB = 15 τ0

  38. Transmission Characteristics 1 2 4 8 7 6 5

  39. 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.

  40. RF loss measurement of pipeline Kaisar Khan, Jie Chen, Satish Valenkar and Dr. Thomas Wu

  41. RF loss measurement

  42. 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)

  43. Receiver Section (B) Transmitter Section (A) RF Loss Measurement of Gas Pipe (II) • Transmitter Section: • Receiver Section: • Total S-parameter: where;

  44. 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

  45. Probe depth of penetration to launch RF waves Short Circuit L 2g 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)

  46. 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

  47. 1.2 GHz Transceiver Design Kaisar Khan, Yupeng Chen and Dr. L. Marten UCF and Emtel Inc.

  48. System Overview : Flow Watch Monitoring System Sensor System Breach Pipeline RF signal