Polarization compensated integrated optical filters and multiple

Details Polarization compensated integrated optical filters and multiple Polarization compensated integrated optical filters and multiple

1993-03-19

1994-08-23

Healy, Brian

Optical waveguides

Polarization without modulation

385 14, 385 24, 385 28, 385 29, 385 46, 385130, 385131, 385132, 359115, 359120, 359122, G02B 612, G02B 610, H04J 1400

Patent

active

053414446

ABSTRACT:
In accordance with the invention the birefringence induced by compressive strain in silica waveguides on silicon substrates is compensated with a high index patch--such as silicon nitride--placed adjacent the core. The patch is disposed sufficiently close to the core to optically couple with the transmitted optical mode. The patch is preferably wider than the core to intersect the exponential tail of the transmitted optical mode. Such a high index patch preferentially couples TE polarization modes. By choosing an appropriate length for the patch, both strain and bend birefringence can be compensated.

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