Proceedings PaperGraded-index single-mode polymer waveguide hologram on GaAs substrate for near-infrared twelve-channel wavelength division demultiplexer
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A twelve-channel single-mode wavelength division demultiplexer operating at 830, 840, 850, 860, 870, 880, 890, 900, 910, 920, 930 and 940 nm with diffraction angle varying from 10 degree(s) to 65 degree(s) and using a graded index (GRIN) polymer waveguide is reported for the first time on a semi-insulating GaAs substrate. Diffraction efficiency up to 55% was measured. The wavelength spreading of the Ti:Al2O3 laser (approximately 4 nm, 3 dB bandwidth) causes an average crosstalk figure of -20.5 dB. The beam width of the diffracted signal as a function of the input beam width, the grating interaction length, and the diffraction angle are considered.