Optical waveguides – Planar optical waveguide – Thin film optical waveguide
Patent
1997-10-01
2000-10-24
Ngo, Hung N.
Optical waveguides
Planar optical waveguide
Thin film optical waveguide
385 46, 385122, 385143, G02B 610
Patent
active
061379395
ABSTRACT:
The present invention teaches a novel technique for reducing the temperature-related spectrum shifts in optical devices, particularly waveguide grating routers (WGR). In general, the present invention modifies a portion of the length of at least one waveguide within an optical device in a manner that stabilizes the wavelength spectrum passing therethough even when exposed to temperature variations. More specifically, by knowing how the refractive index of a certain material changes with temperature variations as compared to that of common waveguide materials, such a silica, one may employ the teachings of the present invention to precisely modify the nature of the optical path through which a signal travels to fully compensate for any temperature-related wavelength spectrum shift. In other words, be able to produce an optical device with a plurality of waveguides each of which is appropriately modified so that any optical signal passing therethrough has the same wavelength at any two given temperatures.
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Henry Charles Howard
Li Yuan P.
Lucent Technologies - Inc.
Ngo Hung N.
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