A 64 channel and 25 GHz spacing multi/demultiplexer has been successfully fabricated by monolithically integrating a Mach-Zehnder interferometer and two arrayed-waveguide gratings (AWGs) in a PLC chip. The centre wavelength of the AWG was precisely tuned with UV laser irradiation at 193 nm.
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Abe et al. (2001) studied this question.
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