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Eight-channel wavelength-division-multiplexed (WDM) channel selectors were fabricated based on an monolithic integration of two arrayed-waveguide gratings and a semiconductor optical amplifier array on InP substrates. A compact device size of 5.2/spl times/3.6 mm/sup 2/ was achieved with a combination of deep-ridge waveguides and buried waveguides. The device can select an arbitrary signal from a WDM signal with a low crosstalk of less than -40 dB, and fiber-to-fiber zero insertion loss operations were also achieved.
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Ishii et al. (1999) studied this question.
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