Ultra fast optical signal processing using arrayed waveguide grating

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Ultra-short optical pulse shaping based on time-space conversion has been widely demonstrated by using free-space optics with diffraction grating pairs and lenses. We have proposed time-to-space conversion optical signal processing using an arrayed waveguide grating. The arrayed-waveguide grating system has the advantages of a long time window, and well suites to handle subpico- to several picosecond pulses. Moreover, it is compact, compatible with fiber optics, and can be integrated with functional photonic devices. We introduce several applications of this technology to terabit communication systems, such as pulse shaping, dispersion comp ensation, and optical COM encoder and decoder. Furthermore, we proposed a novel method for measuring the waveform of short optical pulses, which uses two-photon absorption process hi a silicon image sensor. We confirmed that infrared ^ht images with 1550nm wavelength were successfully, captured by the image sensor. Then we constructed a Michelson interferometer with a tilted reference mirror for measuring autocorrelation wave forms of optical pulses instantaneously without scanning mechanism.