Ishikura Norihiro, Baba Toshihiko, Kuramochi Eichi, Notomi Masaya
Department of Electrical and Computer Engineering, Yokohama National University, 79-5 Tokiwadai, Yokohama, 240-8501, Japan.
Opt Express. 2011 Nov 21;19(24):24102-8. doi: 10.1364/OE.19.024102.
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.
制备了基于光子晶体耦合波导的慢光器件，通过局部加热，对于宽度为2 ps的慢光脉冲获得了72 ps的可调延迟，这对应于36的可调分数延迟。通过在外部光纤中进行自相位调制和色散补偿来压缩输出脉冲，该值进一步提高到110。我们将此器件用作延迟扫描器应用于光学相关器，其中分数延迟决定延迟扫描的分辨率。使用该相关器，我们成功地在高达2 kHz的扫描频率下观测到了亚皮秒脉冲，这比传统相关器中的机械扫描器快100倍。
