10 September 2007 Dispersion compensator based on multiple 1D coupled-defect-type photonic crystals
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We have developed an ultra compact dispersion compensator based on multiple one dimensional coupled-defect-type photonic crystals, utilizing large optical group velocity dependence on the wavelength without polarization mode dependence. The photonic crystal of the compensator consists of a SiO2/Ti2O5 multi-layer thin-film structure and SiO2 defect layers and was designed for a 1.55-μm, 40-Gbit/s optical communication system. The thin-film structure is substrate-free, which enables the compensator to be small, that is, a 1.4-mm-edge cube. To obtain a large group-velocity difference, 60 substrate-free films are stacked to form the compensator. The passband is 2 nm, and the group delay time-difference within the band is more than 100 ps. A 40-Gbit/s non-return-to-zero optical transmission experiment was carried out with the compensator, demonstrating dispersion-compensation operation over a 10-km standard single-mode fiber, which corresponds to dispersion of 170 ps/nm.
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Misuzu Sagawa, Misuzu Sagawa, Shigeo Goto, Shigeo Goto, Kazuhiko Hosomi, Kazuhiko Hosomi, Toshiki Sugawara, Toshiki Sugawara, Toshio Katsuyama, Toshio Katsuyama, Yasuhiko Arakawa, Yasuhiko Arakawa, } "Dispersion compensator based on multiple 1D coupled-defect-type photonic crystals", Proc. SPIE 6779, Nanophotonics for Communication: Materials, Devices, and Systems IV, 67790H (10 September 2007); doi: 10.1117/12.731969; https://doi.org/10.1117/12.731969

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