学術雑誌論文

Design of a Wavelength Demultiplexer Based on a Bent Waveguide Coupler Using the Three-Dimensional Beam-Propagation Method

eng

09168524

Institute of Electronics, Information and Communication Engineers

5

765

770

2003-05-01

Version of Record

http://search.ieice.org/

A bent-waveguide-based multimode interference (MMI) demultiplexer is designed for the operation at 0.85- and 1.55-μm wavelengths using the three-dimensional semi-vectorial beam-propagation method. First, it is shown that the use of a straight MMI waveguide results in a long coupler length of more than 1000μm for wavelength demulitplexing. To reduce the coupler length, we next introduce a bent MMI waveguide. Bending with a radius of 1500μm leads to a coupler length of less than 200μm. After designing two output waveguides connected to the MMI section, we finally choose a coupler length to be 175μm for efficient demultiplexing properties. Consequently, an output power of more than 90% can be obtained, leading to a low insertion loss of 0.34dB at both 0.85- and 1.55-μm wavelengths. The demultiplexer achieves small polarization dependence, i.e., less than 2dB difference in contrast and 0.02dB difference in insertion loss.

Copyright (C) 2003, IEICE

Article

AA10826283