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Opt Express. 2008 Jun 9;16(12):9245-53.

Large delay-bandwidth product and tuning of slow light pulse in photonic crystal coupled waveguide.

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  • 1Yokohama National University, Department of Electrical and Computer Engineering79-5 Tokiwadai, Hodogayaku, Yokohama 240-8501, Japan.


This paper reports two advances in a slow light device consisting of chirped photonic crystal slab coupled waveguide on SOI substrate. One is concerning the delay-bandwidth product, indicating the buffering capacity of the device. We experimentally evaluated a record high value of 57 (a 40 ps delay and a 1.4 THz bandwidth). We also observed ~1 ps wide optical pulse transmission in the cross-correlation measurement. Regarding the pulse as a signal and considering the broadening of the pulse width due to the imperfect dispersion compensation in the device, storage of more than 12 signal bits was confirmed. The other is a wide-range tuning of the pulse delay. We propose a technique for externally controlling the chirping to permit variable delay. We demonstrate tuning of the pulse delay up to 23 ps, corresponding to a ~7 mm extension of the free space length.

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