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Post-Doctoral/Visiting Researchers

Group Assistant

  • Tamara Berton

Recent Former Group Members

 
2012 Group

Mingzhi Lu

Mingzhi Lu B.S. Electrical Engineering
Southeast University, Nanjing, China
M.S. Electrical Engineering
University of California Santa Barbara

mlu@ece.ucsb.edu

Mingzhi 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.

Before joining the group, Mingzhi had focused on various topics such as Terahertz, metamaterials, FSS, pyroelectrics and acoustic signal processing.

Recent Publications:

  • M. Lu, H. Park, J.S. Parker, E. Bloch, A. Sivananthan, Z. Griffith, L.A. Johansson, M.J. Rodwell, and L.A. Coldren, “A Heterodyne Optical Phase-locked Loop for Multiple Applications,” Proc. Optical Fiber Communication Conference, paper no. OW3D.1, Anaheim, CA (March 17-21, 2013)
  • M. Lu, H. Park, A. Sivananthan, J.S. Parker, E. Bloch, L.A. Johansson, M.J. Rodwell, and L.A. Coldren, “Monolithic Integration of a High-speed Widely-tunable Optical Coherent Receiver,” Photonic Technology Letters, 25, (11), pp. 1077-1080, June 1, 2013.
  • M. Lu, H. Park, E. Bloch, A. Sivananthan, J.S. Parker, Z. Griffith, L.A. Johansson, M.J. Rodwell, and L.A. Coldren, “An Integrated 40 Gbit/s Optical Costas Receiver,” Journal of Lightwave Technology, 31, (13), pp. 2244-2253, July 1, 2013
  • M. Lu, H. Park, E. Bloch, A. Sivananthan, A. Bhardwaj, L.A. Johansson, M.J. Rodwell, and L.A. Coldren, “Highly Integrated Optical Heterodyne Phase-locked Loop with Phase/frequency Detection,” Optics Express, 20, (9), pp. 9736-9741 (April 2012)
  • M.Lu, H. Park, E. Bloch, A. Sivananthan, Z. Griffith, A. Bhardwaj, L.A. Johansson, M.J. Rodwell, and L.A. Coldren, “A Highly Integrated Optical Phase-locked Loop with Single-sideband Frequency Sweeping,” Proc. CLEO 2012, paper no. CW1K, San Jose, CA (May 6-11, 2012)
  • M.Lu, H. Park, E. Bloch, A. Sivananthan, Z. Griffith, L.A. Johansson, M.J. Rodwell, and L.A. Coldren, “A Highly Integrated Optical Phase-locked Loop for Laser Wavelength Stablization,” Proc. IEEE Photonics Conference, paper no. ThR2, Burlingame, CA (September 23-27, 2012)
  • M.Lu, H. Park, E. Bloch, A. Sivananthan, J.S.Parker, Z. Griffith, L.A. Johansson, M.J. Rodwell, and L.A. Coldren,“A Photonic Integrated Circuit for a 40Gbaud/s Homodyne Receiver using an Optical Costas Loop,” Proc. IEEE Photonics Conference, paper no. PD1.4, Burlingame, CA (September 23-27, 2012) POST DEADLINE

Abi Sivananthan

Abi Sivananthan abirami.sivananthan@gmail.com

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

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).

Recent Publications:

  • A.V. Barve, Y. Zheng, L.A. Johansson, A. Mehta, A. Husain, and L.A. Coldren, “High Speed Polarization Modulation of Oxide Confined Asymmetric VCSELs in Multimode Regime,” Proc. IEEE Photonics Conference, paper no. TuE2.3, Bellevue, WA (September 8-12, 2013)
  • A.V. Barve, Y. Zheng, L.A. Johansson, and L.A. Coldren, “Frequency Dependent Polarization Dynamics in Vertical Cavity Surface Emitting Lasers with Electrical Injection,” Proc. IEEE Photonics Conference, TuF3, Burlingame, CA, (September 23-27, 2012)
  • A.V. Barve, Y.Zheng, L.A.Johansson, A. Mehta, A. Husain and L.A. Coldren, "Fast Polarization Modulation in Vertical Cavity Lasers with Electrical RF Injection,” Proc. 23rd IEEE Semiconductor Laser Conference, paper no. PD1.4, San Diego, CA (October 7-10, 2012) POST DEADLINE
  • A.V. Barve, Y. Zheng, L.A. Johansson, A. Mehta, A. Husain, and L.A. Coldren, “Ultrafast Polarization Modulation in Vertical Cavity Surface Emitting Lasers with Frequency Dependent Current Injection,” Applied Physics Letters, 101, (25), pp. 1-4, (November 2012)

Weihua Guo

Weihua Guo

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

guow@ece.ucsb.edu

Weihua 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.

Recent Publications:

  • “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.

Leif Johansson

Leif Johansson Ph.D. Engineering, 2002
University College, London
M.Sc. Engineering, 1997
KTH, Stockholm, Sweden

leif@ece.ucsb.edu

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.

Recent Publications:

Milan Mashanovitch (Mašanović)

Milan Mashanovitch http://www.ece.ucsb.edu/~mashan/

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.