Review of Blue-Green Wavelength Division Multiplexing Technology(Invited)
Wavelength division multiplexing(WDM)technology has been shown to effectively increase the capacity of optical communications with minimal channel crosstalk in the near-infrared light band.However,to date,WDM systems in the blue-green band support a limited number of wavelength channels with coarse channel spacing.This is because no multi/demultiplexers(MUX/DeMUX)exist that use fine wavelength spacing for visible light.To clarify this issue,this study reviews the development of WDM in the visible band and discusses the recent development of dense blue-green WDM based on integrated optical phased array DeMUX.Finally,the study summarizes and prospects the development trends of blue-green WDM.
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