Wavelength division multiplexing and demultiplexing with photonic crystal waveguide couplers
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概要
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A multiplexer–demultiplexer (MUX–DEMUX)based on PC waveguide couplers is proposed, and its wavelengthdemultiplexing properties are theoretically investigated. First, atwo-channel MUX–DEMUX is designed and characterized, andthen, by cascading, two stages of photonic crystal (PC) waveguidecouplers with different coupling coefficients are constructed. Thedevice sizes are expected to be drastically reduced from a scale ofa few tens of micrometers to a scale of a few hundreds of micrometersin a MUX–DEMUX with a channel spacing of about 20 nmrequired for wide-passband wavelength division multiplexing(WWDM) systems. The simulation results are obtained using atime-domain beam propagation method (BPM) based on a finiteelement scheme and a simpler coupled-mode theory.
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