Lightwave Research Laboratory Research Group


Professor Keren Bergman

Research Scientists

Dr. Sebastien Rumley
Dr. Payman Samadi

Post-Doctoral Researchers

Dr. Qixiang Cheng
Dr. Dessislava Nikolova
Dr. Robert Polster

Visiting Scholars

Ji Zhou

Ph.D. Students

Nathan Abrams
Erik Francis Anderson
Meisam Bahadori
Sasha Gazman
Hang Guan
Yishen Huang
Aneek. James
Natalie Janosik
Richard Dai
Min Yee Teh
Ari Novack
Yiwen Shen
Ziyi Zhu

Master's and Undergraduate Researchers


Professor Keren Bergman (Principal Investigator)


Office: 1300 Mudd

Phone: 212-854-2280

Keren Bergman is the primary investigator of the Lightwave Research Laboratory and the Charles Batchelor Professor of Electrical Engineering of Columbia University in the City of New York.

Dr. Sebastien Rumley (Research Scientist)

Email: rumley [at] ee.columbia [dot] edu

Office: 806 CEPSR

Phone: 212-854-8068

Sebastien Rumley received his M.S. degree in telecommunications engineering from the Ecole Polytechnique Federale de Lausanne (EPFL) in 2005, after graduate studies in Lausanne, Zurich and Santiago de Chile (PUC). He received PhD degree in 2011 from the EPFL, where he worked as research assistant at the Telecommunications Laboratory between 2006 and 2011. His research focuses on optical interconnect modeling, mainly for applications in High-Performance Computing and Distributed Computing platforms.

Dr. Payman Samadi (Research Scientist)

Email: samadi [at] ee.columbia [dot] edu

Office: 806 Shapiro CEPSR

Phone: 212-854-8068

Payman Samadi received his B.S. and M.S. in Electrical Engineering from Shahid Beheshti University and University of Windsor in 2005 and 2007. He received his Ph.D. in Photonics from McGill University in 2012. He worked as a product manager at Optiwave Systems Inc. from 2011-2013. His research interests include application of Optical Interconnects for High Performance Computing, Software-Defined Networking and Optical Transport Networks.

Dr. Qixiang Cheng (Post-Doctoral Researcher)

Email: qc2228 [at] columbia [dot] edu

Office: 803 CEPSR

Phone: 212-854-5348

Qixiang Cheng received his B.S from Huazhong University of Sci. & Tech., China in 2010 and Ph.D. from the University of Cambridge, UK studying III/V integrated optical switches in 2014. He then stayed as a research assistant until March 2015, he joined Shannon Lab., Huawei, China researching future optical computing systems. His current research interests include design, simulation, and characterization of large-scale optical integrated switches and optical interconnects in data-centers based on silicon platform.

Dr. Dessislava Nikolova (Post-Doctoral Researcher)

Email: dnn2108 [at] columbia [dot] edu

Office: 806 CEPSR

Phone: 212-854-8068

Dessislava Nikolova has a M.Sc. degree in Solid State Physics from Sofia University, Bulgaria and a PhD in Computer Science from University of Antwerp, Belgium. She has spent two years as a research engineer in optical access networks with Alcatel working on scheduling algorithms for passive optical networks. After obtaining her PhD she was awarded a Marie-Curie Fellowship to study the interaction between magnetism and plasmonics on the nanoscale at the London Center for Nanotechnology. Her current research interests are designing, modelling and demonstrating silicon photonic systems for optical interconnects, switches and quantum communication.

Dr. Robert Polster (Post-Doctoral Researcher)

Email: rpp2130 [at] columbia [dot] edu

Office: 811 CEPSR

Phone: 212-854-1249

Robert Polster received his Ph.D. from the Universite Paris Sud in 2015 for his research on silicon photonic links that was carried out at the CEA-LETI in Grenoble, France. He received his M.S. degree in physics from the Humboldt University, Berlin, Germany in 2012. His Master thesis was carried out at the Institute for Quantum Optics and Quantum Information Theory (IQOQI) in Vienna from 2011-2012. He carried out further studies at the Paul-Scherrer-Institut / ETH Zurich and in the high field laser laboratory of the Max-Born-Institute in Berlin from 2006-2009. His current research interest is silicon photonic links.

Nathan Abrams (Ph.D. Candidate)

Email: nca2123 [at] columbia [dot] edu

Office: 803 CEPSR

Phone: 212-854-5348

Nathan Abrams received both his B.S. in Electrical Engineering from Columbia University in 2014 and his B.A. in Natural Mathematics and Sciences from Whitman College in Walla Walla, WA in 2014. He is currently working towards his M.S. and Ph.D at Columbia University, with research interests relating to photonic devices.

Erik Francis Anderson (Ph.D. Candidate)


Office: 807 CEPSR

Erik graduated with a Bachelor of Science in Electrical Engineering from Northwest Nazarene University in Nampa, Idaho in May 2016. He is currently working towards his M.S. and Ph.D at Columbia University, with research interests relating to integrated photonic devices.

Meisam Bahadori (Ph.D. Candidate)

Email: mb3875 [at] columbia [dot] edu

Office: 821 CEPSR

Phone: 212-854-5946

Meisam Bahadori received his B.S. degree in electrical engineering, majoring in Telecommunications, from Sharif University of Technology in 2011. After that, he worked towards M.S. degree in electrical engineering, majoring in Microwaves and Optics, at the same school and graduated with the highest honors in June 2013. From September 2011 to August 2014, he was a research assistant at the Integrated Photonics Laboratory, where he studied the theory of propagation of light in metallic nanostructures and plasmonic devices. He is currently pursuing a PhD in electrical engineering with research interests related to photonics and optical devices.

Sasha Gazman (Ph.D. Candidate)

Email: ag3529 [at] columbia [dot] edu

Office: 821 CEPSR

Phone: 212-854-5946

Sasha Gazman received his BS in Electrical Engineering with concentration in Nanotechnology from Boston University in May 2013. He is the recipient of the P. T. Hsu Memorial Award for senior design project. After graduation he worked at MC10 and Fromlabs working on medical sensors and 3D printers. His current research interests are optical networks for data centers and FPGA development of optical network interface hardware.

Hang Guan (Ph.D. Candidate)

Email: hg2388 [at] columbia [dot] edu

Office: 804 CEPSR

Phone: 212-854-5874

Hang Guan received his B.S. in Electrical and Computer Engineering from University of Electronic Science and Technology of China in 2012 and his M.S. from National University of Singapore in 2014. He is currently pursuing his Ph.D. at Columbia University, with interests in novel silicon photonic devices and systems.

Yishen Huang (Ph.D. Candidate)

Email: yh2785 [at] columbia [dot] edu

Office: 803 CEPSR

Phone: 212-854-5348

Yishen received his B.S. degree in Engineering Physics from Queen's University in Kingston, Canada in 2015 as a Chancellor's Scholar and a Dean's Scholar. He completed internships with Ciena Networks and IBM prior to joining Lightwave Research Laboratory. Currently he is pursuing his M.S. and Ph.D at Columbia University, with interests in optical interconnects for High-Performance Computing.

Aneek. James (Ph.D. Candidate)


Office: 808 CEPSR

Aneek James graduated magna cum laude from the University of Georgia in 2017 with a B.S. in Electrical and Electronics Engineering. He previously worked at UGA's Lightwave and Microwave Research laboratory, where he received Goldwater Scholarship Honorable Mention for studying high-speed, adaptive microwave photonic filters. He is now currently pursuing his M.S./PhD. at Columbia University, with interests in silicon photonic chip design and testing for data communications.

Natalie Janosik (Ph.D. Candidate)

Email: nsj2114 [at] columbia [dot] edu

Office: 807 CEPSR

Natalie Janosik received her Bachelor of Science degree in Electrical Engineering with a minor in Computer Science at the University of Pittsburgh where she did research on oscillator-based computing technology. She worked for Raytheon Space and Airborne Systems Electronic Warfare division the past two summers. She is currently working toward her MS/PhD degree at Columbia University with research focusing on silicon photonics and optical computing.

Richard Dai (Ph.D. Candidate)

Email: ld2719 [at] columbia [dot] edu

Office: 807 CEPSR

Richard Dai received his B.S. in Electrical Engineering, along with a minor in Computer Science, at New Jersey Institute of Technology in May 2016. He is currently pursuing his M.S. and Ph.D at Columbia University, with a focus in photonic devices and systems.

Min Yee Teh (Ph.D. Candidate)

Email: mt3126 [at] columbia [dot] edu

Office: 807 CEPSR

Min Yee Teh received the Bachelor of Science (Magna cum Laude and with honors in Engineering) from Brown University in 2016. He worked as an intern in the Automotive MEMS group of Analog Devices Inc. He is currently working toward his MSc/PhD in Columbia University focusing on optical interconnects and high performance computing.

Ari Novack (Ph.D. Candidate)

Email: ajn2137 [at] columbia [dot] edu

Office: 803 CEPSR

Phone: 212-854-5348

Ari Novack received a B.S. in Engineering and a B.A. in Physics from Swarthmore College in 2012. He studied at the National University of Singapore through 2014 before moving to Columbia University to pursue a Ph.D. His research interest is integrated silicon photonics including the germanium photodetector.

Yiwen Shen (Ph.D. Candidate)

Email: ys2799 [at] columbia [dot] edu

Office: 821 CEPSR

Phone: 212-854-5946

Yiwen Shen received his B.Sc. degree from the University of Toronto in 2014 in Electrical Engineering. During 2013-2014 he undertook research projects relating to the fabrication of femtosecond laser-written lab-in-fiber devices for sensing applications. He is currently working towards a M.Sc. degree at Columbia University with a focus on optical interconnects and software defined networking with applications in data centers networks.

Ji Zhou (Visiting Scholar)


Office: 808 CEPSR

Ji Zhou received the B.S. degree in Communication Engineering from the Beijing University of Posts and Telecommunications, Beijing, China, in 2012, where he is currently working toward the Ph.D. degree at the School of Information and Communication Engineering and State Key Laboratory of Information Photonics and Optical Communications. Now, he is a visiting scholar at Columbia University. His current research interests include digital signal processing for direct-detection and coherent optical communications as well as their applications in visible light communications, access networks and optical interconnection networks.

Ziyi Zhu (Ph.D. Candidate)

Email: zz2374 [at] columbia [dot] edu

Ziyi Zhu received the B.S. in Electrical Engineering and graduated with honors from Sichuan
University in Chengdu, China, in 2015 and the M.S. in Electrical Engineering, with honors, from
Columbia University, New York, NY, USA, in 2017. Currently, he is working towards a Ph.D.
degree with interests in developing and testing optical switches and FPGA controlled optical