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Planar Concave Grating Demultiplexer With High Reflective Bragg Reflector Facets

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6 Author(s)

We present measurement results of an ultracompact four-channel silicon-on-insulator planar concave grating demultiplexer fabricated in a complimentary metal-oxide-semiconductor line using deep-ultraviolet lithography. The demultiplexer has four output channels separated by 20 nm and a footprint of only 280 mum times 150 mum. The crosstalk is better than 25 dB and the on-chip loss is drastically reduced down to 1.9 dB by replacing each facet by a second-order Bragg reflector.

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Photonics Technology Letters, IEEE  (Volume:20 ,  Issue: 4 )