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We discuss an emerging monolithic “photonic integrated circuit” technology for application in future wavelength division multiplexed (WDM) networks. Based on a planar reflection-grating wavelength multiplexer/demultiplexer, and realized in InP-matched material for the long wavelength fiber band, the WDM optical cavity may be integrated with different active elements to provide a variety of spectrally-matched WDM functional components. We consider the design and performance of the basic mux/demux, and review the current status of both the passive device and integrated active components. We also look to the future and assess prospective near-term advancements.
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Soole et al. (1994) studied this question.
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