Reduction of truncation loss of a tapered active waveguide

Details Reduction of truncation loss of a tapered active waveguide Reduction of truncation loss of a tapered active waveguide

2005-12-06

2005-12-06

Palmer, Phan T. H. (Department: 2874)

Optical waveguides

With optical coupler

Particular coupling structure

C385S014000, C385S043000, C372S050121

Reexamination Certificate

active

06973241

ABSTRACT:
A semiconductor optical device comprises an active waveguide having a tapered portion, and a passive waveguide extending beyond the end of the active waveguide and optically coupled to the tapered portion of the active waveguide. The passive waveguide beyond the end of the active waveguide supports an optical mode of larger size than the optical mode supported by the active waveguide. The tapered portion of the active waveguide is truncated and the separation between the active waveguide and the passive waveguide is greater than in previously known devices in order to minimize or at least reduce the truncation loss at the truncation.

REFERENCES:
patent: 5844929 (1998-12-01), Lealman et al.
patent: 6253009 (2001-06-01), Lestra et al.
patent: 2003/0210866 (2003-11-01), Kuhara et al.
patent: 2 326 020 (1998-12-01), None

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