6 March 2013 Electrically controlled photonic crystal slow light device and its application to optical correlator
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Proceedings Volume 8636, Advances in Slow and Fast Light VI; 86360X (2013) https://doi.org/10.1117/12.2003624
Event: SPIE OPTO, 2013, San Francisco, California, United States
Lattice-shifted photonic crystal waveguides (LSPCWs) are effective for generating wide-band on-chip slow light at room temperature. In this study, we integrated the LSPCW with multi-heaters using CMOS-compatible process, and demonstrated electrically-tunable slow light. Seven heaters were placed on each side of the LSPCW with air slots for thermal isolation. On-demand temperature distributions were formed by controlling each heating power independently. When the heating powers were optimized, a clear delay peak of slow light corresponding to the flat photonic band of the LSPCW was observed, which suggests that fabrication errors in the air-hole diameters were less than 5 nm and related band fluctuation was well compensated by the heating. When a linear temperature distribution was added to this condition, the delay was reduced up to 54 ps. When a quadratic distribution was added, the group delay dispersion was generated in the range from -10.2 to 17.5 ps/nm. We applied the tunable delay to the delay scanning in optical correlator. Here, output pulse were compressed to 0.6 ps through self-phase modulation and dispersion compensation in external fibers, and its delay was tuned in range of 17 ps. At a scanning frequency of 100 Hz, which is <10 times faster than that of conventional mechanical delay scanners, pulse lengths of 0.3 - 6 ps were measured with a <95% accuracy. We are also fabricating all on-chip optical correlator consisting of this slow light delay scanner and two-photon-absorption photo-diodes.
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Norihiro Ishikura, Norihiro Ishikura, Ryo Hayakawa, Ryo Hayakawa, Ryo Hosoi, Ryo Hosoi, Mizuki Shinkawa, Mizuki Shinkawa, Hong C. Nguyen, Hong C. Nguyen, Naoya Yazawa, Naoya Yazawa, Toshihiko Baba, Toshihiko Baba, } "Electrically controlled photonic crystal slow light device and its application to optical correlator", Proc. SPIE 8636, Advances in Slow and Fast Light VI, 86360X (6 March 2013); doi: 10.1117/12.2003624; https://doi.org/10.1117/12.2003624

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