Method for polarization birefringence compensation in a waveguide demultiplexer using a compensator with a high refractive index capping layer.
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United States of America Patent
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app pub date -
Jan 25, 2002
filing date -
Sep 12, 2001
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Abstract
A method is disclosed for polarization birefringence compensation in a photonic device with a slab waveguide having a core. A compensator region is formed in the slab waveguide to minimize the wavelength shift between light of different polarizations. A thin capping layer, typically of silicon nitride, having a higher refractive index than the core, is formed on the compensator region to increase the birefringence contrast between the compensator region and the planar waveguide.
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