A sidemode suppression for a vertically and contra-directionally coupled semiconductor waveguide-type optical add-and-drop multiplexer is investigated theoretically and experimentally, by introducing a window function to a grating width. Grating configuration dependence of device characteristics was numerically calculated based on the finite element method and the coupled-mode equations. It was found that the sidemode suppression ratio (SMSR) could be improved to be more than 30dB even by a simple linear changing of the grating width. In the device fabrication, a trimmed grating was formed by a multi-step exposure method, including an interferometric exposure and a laser beam direct drawing. SMSR of 18 dB was obtained for a fabricated device, and improvement was obvious in contrast with a uniform grating. A comparison between the calculated and experimental results is also given.
|ジャーナル||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|出版ステータス||Published - 1999|
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