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Opt Express. 2011 Nov 21;19(24):24102-8. doi: 10.1364/OE.19.024102.

Large tunable fractional delay of slow light pulse and its application to fast optical correlator.

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Department of Electrical and Computer Engineering, Yokohama National University, 79-5 Tokiwadai, Yokohama, 240-8501, Japan.


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.

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