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Applying a Mode Selector to Improve the Pulse-Compression Performance of Asymmetric-Coupled-Waveguide-Based Dispersion Compensators |
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| Authors: | Yong Lee Kazuhiko Hosomi Hiroyuki Uchiyama Toshio Katsuyama Shinya Kominami Tomoyoshi Mishima |
| Affiliation: | (1) Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji Tokyo, 185-8601, Japan;(2) Advanced Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji Tokyo, 185-8601, Japan |
| Abstract: | An InGaAsP slab-type asymmetric-coupled-waveguide-based dispersion compensator with a mode selector has been designed and fabricated. The mode selector is necessary to select either a symmetric [with a positive group-velocity dispersion (GVD)] or antisymmetric (with a negative GVD) supermode. These supermodes exist simultaneously in the dispersion-compensation region of the device. Pulse-compression experiments were used to test the dispersion compensator, evaluating the function of the mode selector. A theoretical study of the experimental results shows that the mode selector obtains a very strong selectivity (nearly 100%) for the antisymmetric supermode. |
| Keywords: | asymmetric coupled waveguide dispersion compensator mode selector pulse compression symmetric supermode antisymmetric supermode |
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