TY - JOUR
T1 - Sidemode suppression of optical add-and-drop multiplexer utilizing vertically coupled InGaAsP waveguides
AU - Horita, Masayoshi
AU - Tanaka, Shinsuke
AU - Matsushima, Yuichi
PY - 1999
Y1 - 1999
N2 - 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.
AB - 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.
KW - Grating width
KW - Laser beam direct drawing
KW - Optical add-and-drop multiplexer
KW - Semiconductor waveguides
KW - Sidemode suppression
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M3 - Article
AN - SCOPUS:0032624569
VL - 38
SP - 1273
EP - 1277
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 2 B
ER -