ELECTRICAL AND COMPUTER ENGINEERING
Northrop Grumman Endowed Chair; Professor, Department of Surgery
68-109 ENG IVEmail:
Phone: (310) 825-9655
RESEARCH AND INTERESTS
- RF photonics
- fiber optic integrated circuits
- integrated optics
- microwave photonics.
- Fiber Optic ICs: Electronics integrated circuits play a critical role in fiber optic communication networks. Traditionally, electronics has been used to perform the so-called 3R regeneration (amplification, reshaping and retiming) of the data. Our research is focused on more innovativ applications of electronic ICs in fiber optic systems that will offer improved performance, or new and previously unattainable functionality. For example, electronic signal conditioning can be used to extend the performance of optical transmitter and receivers. Our research in electronic predistortion has resulted in the first single-chip linearizers for analog fiber optic links. This technology enhances the information carrying capacity of optical networks. Currently, we are extending the capabilities of this technology by integrating adaptive capability into the analog ICs. Our approach is digital control of analog functions and will result in a linearizer that can adapt itself to the particular optical transmitter (laser or external modulator) and to the environmental variations.
- Integrated Optics: Optical devices and circuits can be made using patterned thin films, in a manner very similar to fabrication of electronic integrated circuits. Integrated optic research deals with the design of active and passive waveguide components, modulators and switches, materials and fabrication technology for planar lightwave circuits. These devices represent key building blocks of the Internet backbone. Our research exploits the unique optical properties of Silicon-on-Insulator (SOI). From a material and processing perspective, this technology is fully compatible with standard silicon processing and hence can be manufactured in silicon fab houses. In addition, owing to a strong index mismatch between silicon and SiO2 (or air) optical fields are tightly confined in SOI structures. This allows us to miniaturize the device and circuit dimensions. Our past research has resulted in the first SOI demonstration of virtually all building block components of fiber optic networks. Current research is focused on nano-scopic waveguides and resonators, nonlinear optics, and methods for rendering such devices practical. As an example of the latter, we are developing two-dimensional adiabatic waveguide tapers with which we can efficiently couple light from a normal optical fiber into nano-scopic devices.
- Microwave Photonics: The broadband, low loss transmission capability of optical fiber links has led to much interest in their use for the distribution and control of microwave and millimeter-wave signals. Application areas include antenna remoting for wireless data and cellular radio systems, optically controlled phased array antennas, microwave signal processing and broadband cable television distribution. Photonics brings new functions to microwave systems such as long delay lines, fast spectrum analysis, frequency conversion, probing and control of microwave devices, low phase noise oscillators and ultra-fast analog to digital converters. Our research is focused on using photonics to process microwave and millimeter wave signals. Both linear and nonlinear optical phenomena are used in such techniques. An example of ongoing research is photonic time manipulation (time stretching, compression and reversal) of electrical signals and their application to analog-to-digital (A/D) and digital-to-analog (D/A) conversion.
- K. Goda and B. Jalali, Dispersive Fourier transformation for fast continuous single-shot measurements, Nature Photonics 7, 102 (2013)
- K. Goda, A. Ayazi, D. R. Gossett, J. Sadasivam, C. K. Lonappan, E. Sollier, A. M. Fard, S. C. Hur, J. Adam, C. Murray, C. Wang, N. Brackbill, D. Di Carlo, and B. Jalali, “High-throughput single-microparticle imaging flow analyzer,” Proceedings of the National Academy of Sciences 109, 11630 (2012)
- D. R. Solli, G. Herink, B. Jalali, and C. Ropers, “Fluctuations and correlations in modulation instability,” Nature Photonics 6. 463 (2012)
- K. Goda, A. Mahjoubfar, C. Wang, A. Fard, J. Adam, D. R. Gossett, A. Ayazi, E. Sollier, O. Malik, E. Chen, Y. Liu, R. Brown, N. Sarkhosh, D. Di Carlo, and B. Jalali, “Hybrid dispersion laser scanner,” Scientific Reports 2, 445 (2012)
- D. R. Solli, B. Jalali, and C. Ropers, “Seeded supercontinuum generation with optical parametric down-conversion,” Physical Review Letters 105, 233902 (2010)
- Tan Z., Wang C., Goda K., Malik O., Jalali B., “Jammed-array wideband sawtooth filter,” Opt Express. 2011 Nov 21;19(24):24563-8.
- Diebold E.D., Hon N.K., Tan Z., Chou J., Sienick T., Wang C., Jalali B., “Giant tunable optical dispersion using chromo-modal excitation of a multimode waveguide” Opt Express. 2011 Nov 21;19(24):23809-17.
- Fard A., Yang J.Y., Buckley B., Wang J., Chitgarha M.R., Zhang L., Willner A.E., Jalali B., “Time-stretch oscilloscope with dual-channel differential detection front end for monitoring of 100 Fb/s return-to-zero differential quadrature phase-shift keying data,” Opt Lett. 2011 Oct 1;36(19):3804-6.
- Fard A., Gupta S., Jalali B., “Digital broadband linearization technique and its application to photonic time-stretch analog-to-digital converter,” Opt Lett. 2011 Apr. 1l36(7):1077-9.
- Kim S.H., Goda K., Fard A., Jalali B., “Optical time-domain analog pattern correlator for high-speed real-time image recognition,” Opt Lett. 2011 Jan 15;36(2):220-2.
AWARDS AND RECOGNITION
- Distinguished Engineering Achievement Award from the Engineering Council “For seminal contributions in establishing the field of silicon photonics and for time stretch techniques resulting in a new generation of real time high throughput instruments”., 2013
- IEEE International Symposium on Signal Processing and Information Technology, Best Paper Award, M. Asghari and B. Jalali, “Anamorphic Transform and its Application to time-bandwidth compression”., 2013
- Fellow, Society of Photo-Optical Instrumentation Engineers, 2013
- IEEE Photonics Society’s Aron Kressel Award “For contributions to the science and technology of silicon photonics”., 2012
- Fellow, American Physical Society, 2011
- R.W. Wood Prize from the Optical Society of America “For the Invention and Demonstration of Raman Lasing in Silicon”, 2007
- “Scientific American 50”, 2006
- Maxwell Prize from the American Physical Society for “outstanding and pioneering contributions in the area plasma-based accelerators and laser-plasma interactions”, 2006
- Advanced Solid State Photonics (ASSP) Conference, Best Student Paper Award, Graduate student V. Raghunathan (Professor B. Jalali, advisor), 2006
- Fellow of the Optical Society of America, 2004
- Best Paper Award, First ADC Forum (IMTC), 2003
- IEEE Fellow, 2003
- BridgeGate 20 Award, 2001
- IEEE Lasers and Electro-Optical Society Distinguished Lecturer Award, 1998