title: Large tunable fractional delay of slow light pulse and its application to fast optical correlator.
abstract: The slow light device based on photonic crystal coupled waveguide was fabricated, and a tunable delay of 72 ps was obtained for 2-ps-wide slow light pulses by local heating, which corresponds to a tunable fractional delay of 36. This value was further enhanced to 110 by compressing the output pulses through self-phase modulation and dispersion compensation in external fibers. We applied this device to optical correlator as a delay scanner, where the fractional delay determines the resolution of the delay scanning. Using this correlator, we successfully observed sub-picosecond pulses at a scan frequency up to 2 kHz, which is 100 times faster than that of mechanical scanners in conventional correlators.
authors: Department of Electrical and Computer Engineering, Yokohama National University, 79-5 Tokiwadai, Yokohama, 240-8501, Japan. ishikura-norihiro-hv@ynu.jp
authors: Norihiro
authors: N
authors: Ishikura
authors: Toshihiko
authors: T
authors: Baba
authors: Eichi
authors: E
authors: Kuramochi
authors: Masaya
authors: M
authors: Notomi
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D012031:Refractometry / Q000295:instrumentation*; D013223:Statistics as Topic; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*