Study of ultra-high-speed optical signal processing circuits for photonic network system

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Complicated photonic signal processing without electrical processing is strongly required for the next generation photonic network using wavelength division multiplexing technology. The purpose of this study was the realization of high-performance and high-speed photonic processing circuits integrated with small phase modulators and amplitude modulators with low-phase error waveguides.1.We have realized arbitrary wave form generator consisted of the arrayed-waveguide grating with a channel spacing of 12.5 GHz, 30 channels, and a crosstalk of less than -20 dB ; and amplitude modulators with an extinction ratio of 20 dB, and the maximum phase modulation of 2π were integrated to each channel. The feedback system which monitored the beat wave form between adjacent channel signals was configured to generate arbitrary waveform. The system could generate the transform limited pulse.2.We have fabricated the monolithic dispersion compensation circuit and successfully demonstrated the recovery of the degraded waveform of the 40 Gbit/s signals.3.The multi-stage arrowhead type arrayed-waveguide grating was proposed and fabricated. The loss at the center frequency was 7.5 dB for three-stage type, and was 17 dB for five-stage one. We have also fabricated the high-resolution arrayed-waveguide grating with a channel spacing of 25 GHz, and the wide range arrayed-waveguide grating with a channel spacing of 100 GHz.