Structural Optimization of an Optical 90 Degree Hybrid Based on a Weaklyguided 4x4 Multimode Interference Coupler Using a Parallelized Real-coded Micro-genetic Algorithm

Authors

  • Takashi Yasui Faculty of Engineering Kitami Institute of Technology, Kitami-shi, Hokkaido, 090-8507, Japan
  • Jun-ichiro Sugisaka Faculty of Engineering Kitami Institute of Technology, Kitami-shi, Hokkaido, 090-8507, Japan
  • Koichi Hirayama Faculty of Engineering Kitami Institute of Technology, Kitami-shi, Hokkaido, 090-8507, Japan

Keywords:

Beam-propagation method, finite element method, genetic algorithm, multimode interference coupler, optical waveguides, parallel computation

Abstract

The optimal design of a 4x4 multimode interference (MMI) coupler as an optical 90° hybrid based on a weakly-guided optical waveguide was considered. Seven geometrical parameters of a 4x4 MMI coupler were optimized by a real-coded micro-genetic algorithm, and parallelized using a message-passing interface. The beam-propagation method was used to evaluate the fitness of the MMI coupler in the optimization process. The optimized 4x4 MMI coupler showed a common-mode rejection ratio greater than 28.9 dBe and a phase error less than 2.52° across a wavelength range of 1520 to 1580 nm, which satisfied typical system requirements. The optimization process was executed on a Beowulf-style cluster comprising five identical PCs, and its parallel efficiency was 0.78.

Author Biographies

Takashi Yasui, Faculty of Engineering Kitami Institute of Technology, Kitami-shi, Hokkaido, 090-8507, Japan

Takashi Yasui graduated with the B.S. degree in Electronic Engineering from Fukui University, Fukui, Japan, in 1997, and the M.S. and Ph.D. degrees in Electronic Engineering from Hokkaido University, Sapporo, Japan, in 1999 and 2001, respectively. From 1999 to 2002, he was a Research Fellow of the Japan Society for the Promotion of Science. In 2002, he joined Fujitsu Ltd., Chiba, Japan. From 2004 to 2011, he was an Assistant Professor of the Department of Electronic and Control Systems Engineering, Shimane University, Matsue, Japan. Since 2011, he has been an Associate Professor of the Faculty of Engineering, Kitami Institute of Technology, Kitami, Japan. He has been engaged in research on wave electronics. Yasui is a member of the IEEE, the Optical Society of America (OSA), the Institute of Electronics, Information and Communication Engineers (IEICE) of Japan, and the Information Processing Society of Japan. In 2018, he was awarded the Excellent Paper Award from IEICE.

Jun-ichiro Sugisaka, Faculty of Engineering Kitami Institute of Technology, Kitami-shi, Hokkaido, 090-8507, Japan

Jun-ichiro Sugisaka graduated with the B.E., M.E., and Ph.D. degrees in Optics and Photonics from the University of Tsukuba, Tsukuba, Japan, in 2005, 2007, and 2010, respectively. From 2008 to 2010, he was a research fellow at the Japan Society for the Promotion of Science. From 2010 to 2013, he joined the Center for Optical Research Education at Utsunomiya University, Utsunomiya, Japan, as a doctoral research fellow. From 2013 to 2019, he joined Kitami Institute of Technology as an Assistant Professor. Thenceforth, he has been an Associate Professor of Kitami Institute of Technology. His research interests are in photonic crystals, diffraction, scattering theory inverse problems, artificial intelligence, and computational electromagnetics. Sugisaka is a member of the Institute of Electronics, Information and Communication Engineers (IEICE) of Japan, the Japan Society of Applied Physics, IEEE, and the Optical Society of America. In 2018, he was awarded the Best Paper Award from the IEICE.

Koichi Hirayama, Faculty of Engineering Kitami Institute of Technology, Kitami-shi, Hokkaido, 090-8507, Japan

Koichi Hirayama received the B.S., M.S. and Ph.D. degrees in Electronic Engineering from Hokkaido University, Sapporo, Japan, in 1984, 1986 and 1989, respectively. In 1989, he joined the Department of Electronic Engineering, Kushiro National College of Technology, Kushiro, Japan. In 1992, he became an Associate Professor of Electronic Engineering at Kitami Institute of Technology, Kitami, Japan, and in 2004 he became a Professor. He has been interested in the analysis and optimal design of electromagnetic and optical waveguides. Hirayama is a senior member of IEEE. In 2018, he was awarded the Excellent Paper Award from IEICE.

References

Y. Sakamaki, Y. Nasu, T. Hashimoto, K. Hattori, T. Saida, and H. Takahashi, “Reduction of phasedifference deviation in 90º optical hybrid over wide wavelength range,” IEICE Electron. Express, vol. 7, no. 3, pp. 216-221, Feb. 2010.

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Published

2021-07-16

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