Electrically controlled photonic crystal slow light device and its application to optical correlator

Norihiro Ishikura; Ryo Hayakawa; Ryo Hosoi; Mizuki Shinkawa; Hong C. Nguyen; Naoya Yazawa; Toshihiko Baba

doi:10.1117/12.2003624

6 March 2013 Electrically controlled photonic crystal slow light device and its application to optical correlator

Norihiro Ishikura, Ryo Hayakawa, Ryo Hosoi, Mizuki Shinkawa, Hong C. Nguyen, Naoya Yazawa, Toshihiko Baba

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

Abstract

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.

Citation Download Citation

Norihiro Ishikura, Ryo Hayakawa, Ryo Hosoi, Mizuki Shinkawa, Hong C. Nguyen, Naoya Yazawa, and 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); https://doi.org/10.1117/12.2003624

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KEYWORDS

Picosecond phenomena

Slow light

Dispersion

Optical correlators

Photonic crystals

Waveguides

Silicon

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