"Recent Topics on High-dimensional Modulation and Optical Device Design Optimization"

Keisuke Kojima, Senior Principal Researcher, Mitsubishi Electric Research Laboratories, Cambridge, MA

June 10th (Friday), 4:15pm
Engineering Science Building (ESB), Room 2001

The talk will focus on two research themes being explored at Mitsubishi Electric Research Laboratories (Cambridge, MA). High-dimensional modulation gives an opportunity to improve the linear and nonlinear transmission characteristics of coherent optical fiber transmission systems. I will talk about the recent advances in 4D, 8D, 16D, and 24D modulation formats. The emphasis will be given on the 4D-2A8PSK format we recently proposed, which has the same spectral efficiency as DP-8QAM, and has much better linear/nonlinear performances. We are also working on optical device designs using optimization algorithms. Tens of device parameters can be optimized simultaneously to achieve desired performance. This was applied to wavelength splitters and polarization splitters. I will review these activities.

About Keisuke Kojima:

photo of Keisuke KojimaKeisuke Kojima received the B.S., M.S., and Ph.D. degrees in electrical engineering from the University of Tokyo in 1981, 1983, and 1990, respectively. He also received the M.S. degree from the University of California, Berkeley in 1982. From 1983 to 1991, he was with Mitsubishi Electric Corp., Japan, working on the research of narrow linewidth lasers and AlGaAs/GaAs DFB and DBR lasers. From 1991-2000, he worked with AT&T/Lucent Bell Laboratories on the R&D of uncooled Fabry–Perot and DFB lasers, vertical-cavity surface-emitting lasers and passive optical network systems, first as a Member of Technical Staff, and later as a Technical Manager. He also worked with Agere Systems, Denselight Semiconductors, and TriQuint Semiconductors on optical devices, modules, and optical systems testbed. Since 2005, he has been a Senior Principal Researcher with Mitsubishi Electric Research Laboratories, Cambridge, MA, where he is currently working on the research of photonic-integrated circuits and coherent optical systems. He is a Fellow of the Optical Society of America.

Hosted by: Professor Jonathan Klamkin