Optical waveguides – With optical coupler – Particular coupling structure
Reexamination Certificate
2005-12-27
2005-12-27
Song, Sarah (Department: 2874)
Optical waveguides
With optical coupler
Particular coupling structure
C385S129000, C385S033000
Reexamination Certificate
active
06980720
ABSTRACT:
A low loss coupling arrangement between a slab/strip waveguide and a rib waveguide in an optical waveguiding structure formed on a silicon-on-insulator (SOI) platform utilizes tapered sections at the input and/or output of the rib waveguide to reduce loss. Optical reflections are reduced by using silicon tapers (either vertical tapers, horizontal tapers, or two-dimensional tapers) that gradually transition the effective index seen by an optical signal propagating along the slab/strip waveguide and subsequently into and out of the rib waveguide. Loss can be further reduced by using adiabatically contoured silicon regions at the input and output of the rib waveguide to reduce mode mismatch between the slab/strip waveguide and rib waveguide. In a preferred embodiment, concatenated tapered and adiabatic sections can be used to provide for reduced optical reflection loss and reduced optical mode mismatch.
REFERENCES:
patent: 2002/0172464 (2002-11-01), Delwala
patent: 2003/0068152 (2003-04-01), Gunn, III
Ghiron Margaret
Gothoskar Prakash
Montgomery Robert Keith
Patel Vipulkumar
Pathak Soham
SiOptical Inc.
Song Sarah
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