Athermal optical devices

Details Athermal optical devices Athermal optical devices

1998-02-11

2000-09-12

Ngo, Hung N.

Optical waveguides

With optical coupler

385 14, 385 46, 385131, 385132, G02B 626

Patent

active

06118909&

ABSTRACT:
Optical devices, such as wavelength routers, having a plurality of waveguides of differing lengths, with improved independence to temperature fluctuations. Improved temperature independence is achieved by varying the cross-section of the device waveguides. Cross-section variation can be implemented in one or more of the following ways: selectively applying a temperature-compensating material (e.g., a polymer) over portions of the waveguides, and/or varying the dimensions and/or compositions of the materials used in the waveguides, either along each waveguide or between waveguides or both. By carefully designing the devices, the temperature effects resulting from the different lengths of the different waveguides can be compensated to produce a relatively temperature-independent device. The index of refraction of the temperature-compensating material changes with temperature in the same direction as the indices of refraction of the rest of the waveguide materials, and the effective length of the portion of a waveguide covered by the temperature-compensating material is inversely proportional to the effective length of the waveguide.

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