Temperature-compensated planar waveguide optical apparatus

Details Temperature-compensated planar waveguide optical apparatus Temperature-compensated planar waveguide optical apparatus

2006-01-10

2006-01-10

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

Optical waveguides

With optical coupler

Input/output coupler

C385S003000, C385S010000, C385S014000, C359S569000, C359S565000

Reexamination Certificate

active

06985656

ABSTRACT:
An optical apparatus (spectral filter, temporal encoder, or other) comprises a planar optical waveguide having at least one set of diffractive elements. Each diffractive element set routes by diffraction therefrom a portion of the optical signal propagating in the planar waveguide. The planar waveguide includes at least one material having thermo-optic properties chosen so as to yield a designed temperature dependence of spectral and/or temporal characteristics of the diffracted portion of the optical signal. Variations of material refractive indices, physical dimensions, and/or optical mode distributions with temperature may at least partly compensate one another to yield the designed temperature dependence. Optical materials with ∂n/∂T of various magnitudes and signs may be variously incorporated into the waveguide core and/or cladding. The designed temperature dependence may be: i) substantial temperature independence; ii) a temperature derivative of zero at a selected temperature; or iii) a designed variation with respect to temperature.

REFERENCES:
patent: 6678429 (2004-01-01), Mossberg et al.
patent: 6829417 (2004-12-01), Greiner et al.
patent: 6879441 (2005-04-01), Mossberg

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