Guided-wave optical wavelength-division multi/demultiplexer using high-silica channel waveguides

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Abstract
A guided-wave optical waveguide-division multi/demultiplexer for bidirectional transmission at (0.81 μm, 1.2 μm)/(0.89 μm, 1.3 μm) wavelengths has been realised using high-silica channel waveguides on silicon substrate. The multi/demultiplexer connected with graded-index multi-mode fibres shows a loss of 3.5−5 dB together with far-end and near-end crosstalk levels less than −30 dB and −50 dB, respectively.