Optical waveguides – With optical coupler – Plural
Reexamination Certificate
2006-09-19
2006-09-19
Pak, Sung (Department: 2874)
Optical waveguides
With optical coupler
Plural
Reexamination Certificate
active
07110639
ABSTRACT:
The present invention provides a lightwave circuit device, an optical multiplexer, and an optical demultiplexer with which light can be multiplexed or demultiplexed even when a plurality of lightwaves of varying wavelength are inputted. The lightwave circuit device includes first to third Mach-Zehnder interferometers. The first to third Mach-Zehnder interferometers each have first to third ports, a first optical coupler, first and second optical waveguides, a second optical coupler, and a first heater provided along at least one of the first and the second optical waveguides. The second port of the first Mach-Zehnder interferometer and the first port of the second Mach-Zehnder interferometer are optically coupled, and the third port of the first Mach-Zehnder interferometer and the first port of the third Mach-Zehnder interferometer are optically coupled.
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Tsutomu Kitoh, Manabu Oguma, Yasuyuki Inoue, Tomohiro Shibata, Motohaya Ishii, and Yoshinori Hibino, C-3-125 Low-crosstalk 4-channel coarse WDM filter using silica-based planar-lightwave-circuit, Proceedings of the 2002 Institute of Electronics, Information and Communication Engineers General Conference, 2002, p. 257, Japan.
Chu Chris
Global IP Counselors, LLP
Pak Sung
Sumitomo Electric Industries Ltd.
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