Coupling length variation and multi-wavelength demultiplexing in photonic crystal waveguides
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摘要:
In this Letter,the effects of material/structure parameters of photonic crystal (PhC) parallel waveguides on the coupling length are investigated.The results show that,increasing the effective relative permittivity of the PhC leads to a downward shift of the photonic bandgap and a variation of the coupling length.A compact PhC 1.31/1.55 μm wavelength division multiplexer (WDM)/demultiplexer with simple structure is proposed,where the output power ratios are more than 24 dB.This WDM can multiplex/demultiplex other light waves efficiently.