Recent Former Group Members
|| B.S. Electrical Engineering
University, Nanjing, China
M.S. Electrical Engineering
University of California Santa Barbara
Lu got his B.S. in EE from Southeast University, Nanjing, China, and MS
in EE from UCSB. He is now pursuing his PhD in Prof. Coldren's group.
His current research interest is on high-frequency coherent optical receiver,
based on photonic integrated circuits.
joining the group, Mingzhi had focused on various topics such as Terahertz,
metamaterials, FSS, pyroelectrics and acoustic signal processing.
Abirami received a B.S. in Engineering Physics from the University of Illinois at Urbana Champaign in 2007, and received an M.S. in Electrical and Computer Engineering from the University of California, Santa Barbara, California in 2009. She is currently working towards a Ph. D. in Electrical Engineering at the University of California, Santa Barbara. Her current research interests are focused on the design and fabrication of monolithically integrated optical phase locked loops for low linewidth semiconductor lasers and widely tunable photonic integrated transmitters on the InP/InGaAsP integration platform.
Ajit V. Barve
- B.S. University of Mumbai, 2005
- M.S., Electrical Engineering, Indian Institute of Technology, Kanpur, India, 2007.
- Ph.D. (Distinction), Electrical Engineering , University of New Mexico, Albuquerque. 2012.
His areas of interest are, growth, fabrication and characterization of nanostructured optoelectronic devices. His doctoral research involved making ultrasensitive focal plane arrays with quantum dot infrared photodetectors, which resulted in over 25 publications in international journals and conferences, including a book chapter in a Semiconductors and Semimetals series book titled 'Advances in Infrared Photodetectors '. He also worked with SK Infrared LLC and Vega Technology and Systems LLC. Ajit joined Prof. Coldren's group at UCSB in 2012. His current research is focused on understanding and controlling the polarization properties of vertical cavity surface emitting lasers (VCSEL).
Ph.D. Microelectronics and Solid State Electronics, 2004
Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China
B.Sc. Physics, 1998
Nanjing University, Jiangsu, China
received his B.Sc. in Physics at Nanjing University, China, in 1998. Afterwards
he did research on optical microcavities and semiconductor optical amplifiers
at the Institute of Semiconductors, Chinese Academy of Sciences, Beijing,
as a postgraduate student and got his Ph.D. there in 2004. After then
he joined the Semiconductor Photonics Group in the School of Physics,
Trinity College Dublin, Ireland, as a post doctoral researcher. He did
research there on various things like microcavity enhanced two-photon
absorption photodetectors, photonic integrated transmitters for coherent
WDM optical communications, in-band optical-signal-to-noise-ratio monitoring
techniques, optical pulse characterization techniques, and coherent optical
receivers. In October of 2010 he joined Prof. Coldren’s group. His
primary interest at the moment is on using InP based photonic integrated
circuits to realize functions which are either impossible or difficult
to be realized by using other techniques.
- “Fabry-Pérot laser characterization based on the amplified spontaneous emission spectrum and the Fourier series expansion method,” W. H. Guo, D. C. Byrne, Q. Y. Lu, B. Corbett, and J. F. Donegan, IEEE Journal of Selected Topics in Quantum Electronics, vol. 17, no. 4, 2011.
- “Design of slotted single mode lasers suitable for photonic integration,” Q. Y. Lu, W. H. Guo, D. C. Byrne, and J. F. Donegan, IEEE Photonics Technology Letters, vol. 22, no. 11, pp. 787-789, 2010.
- “Description of polarisation dependence of two-photon absorption in silicon,” J. O’Dowd, W. H. Guo, M. Lynch, E. Flood, A. L. Bradley, and J. F. Donegan, Electronics Letters, vol. 46, no. 12, pp. 854-856, 2010.
- “Compact 2D FDTD method combined with Padé approximation transform for leaky modes analysis,” Q. Y. Lu, W. H. Guo, D. C. Byrne, and J. F. Donegan, IEEE Journal of Lightwave Technology, vol. 28, no. 11, pp. 1638-1645, 2010.
- “In-band OSNR monitoring using a pair of Michelson fiber interferometers,” E. Flood, W. H. Guo, D. Reid, M. Lynch, A. L. Bradley, L. P. Barry, and J. F. Donegan, Optics Experss, vol. 1, no. 4, pp. 3618-3625, 2010.
- “Leaky modes analysis in very deeply etched ridge waveguides,” Q. Y. Lu, W. H. Guo, D. C. Byrne, and J. F. Donegan, IEEE Photonics Technology Letters, vol. 22, no. 6, pp.407-409, 2010.
|| Ph.D. Engineering, 2002
University College, London
M.Sc. Engineering, 1997
KTH, Stockholm, Sweden
Leif A. Johansson received the Ph.D. degree in engineering from University College London, London, U.K., in 2002.
He is currently a Research Scientist with the University of California, Santa Barbara. Leif’s research interests include design and characterization of integrated photonic devices for analog and digital applications, and analog photonic systems and subsystems. In 2005, he co-founded Freedom Photonics to commercialize indium phosphide integrated photonic circuit technology.
Coherent Optical Receivers,” L. A. Johansson, U. Krishnamachari,
A. Ramaswamy, J. Klamkin, S. Ristic, H.-F. Chou, L. A. Coldren, M. J.
Rodwell, and J. E. Bowers, OFC/NFOEC,
OThF5, San Diego, CA (March 21-25, 2010) INVITED PAPER
the Performance of Sampled-Grating DBR Laser-Based Analog Optical Transmitters,” L.A. Johansson, Y.A. Akulova, C. Coldren, and L.A. Coldren, Journal of Lightwave Technology, 26, (7), pp. 807-815 (April
of 10 Gbps Duobinary Signals Using an Integrated Laser-Mach Zehnder
Modulator,” L.A. Johansson and L.A. Coldren, Proc. OFC/NFOEC,
OThC4, San Diego, CA (February 24-28, 2008)
the Performance of Sampled-Grating DBR Laser-Based Analog Optical Transmitters,”
L.A. Johansson, Y.A. Akulova, C. Coldren, and L.A. Coldren, (2007)
Adaptively Predistorted Analog Optical Transmitter,” L.A. Johansson, Y.A. Akulova, P.C. Koh, and L.A. Coldren, Proc.
European Conference Optical Communication (ECOC),
paper no. We1.6.3, Cannes, France (September 2006)
Optical Down-Sampling for High-Performance Analog Links,”
L.A. Johansson and L.A. Coldren, Proc. Optical Fiber Communication
OFC, paper no. JThB30, Anaheim, CA (March 5-10, 2006)
Milan Mashanovitch (Mašanović)
Dr. Milan Mashanovitch (Mašanović) is a project scientist/adjunct professor at the Electrical and Computer Engineering Department of the University of California in Santa Barbara.
Milan received his Dipl. Ing. degree from the School of Electrical Engineering, University of Belgrade, Belgrade, Serbia, as a valedictorian, in 1998. He started his graduate work in the field of integrated photonics at the University of California Santa Barbara in 1998, where he obtained his M.S. (2000) and Ph.D. (2004) degrees. Since 2004, he has been working as a staff scientist/adjunct professor at UC Santa Barbara.
Dr. Mashanovitch is the author or coauthor of more than 85 research papers in peer reviewed journals and conferences. He co-authored the second edition of the book, “Diode Lasers and Photonic Integrated Circuits” with Larry Coldren and Scott Corzine, published by John Wiley in 2012. His current research interests include InP photonic integrated circuits (lasers, transmitters, wavelength converters, optical routers), technologies for packet packet-switched optical networks, as well as optical switching technologies for local area networks and harsh environments.
Dr. Mashanovitch has successfully contributed to a number of DARPA funded photonic integration programs: Next Generation Internet (NGI); Chip-Scale WDM (CS-WDM); and Data in the Optical Domain Networks (DOD-N) as a member and photonic integration effort lead on the LASOR (Label Switched Optical Router) team.
Dr. Mashanovitch is a recipient of numerous awards, scholarships and travel grants, including the 2004 IEEE Lasers & Electro-Optics Society Graduate Student Fellowship Award, the 2003 Best Student Paper Award at the Indium Phosphide and Related Materials Conference, and the Studenica Foundation Graduate Student Fellowship Award.
In 2005, Dr. Mashanovitch co-founded Freedom Photonics LLC, a successful photonic integration company based in Santa Barbara, California, which commercializes advanced photonic components and subsytems for defense and commercial markets.