Thermal compensation and alignment for optical devices
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United States of America Patent
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N/A
Issued Date -
Jun 26, 2003
app pub date -
Dec 21, 2001
filing date -
Dec 21, 2001
priority date (Note) -
Abandoned
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Abstract
An arrayed waveguide device has an expansion rod for adjusting a position of the optical paths at a star coupler, by thermal expansion, to compensate for wavelength response dependence on temperature. A bearing surface parallel to a plane of the waveguides prevents movement out of the plane and allow movement along the bearing surface parallel to the plane. Thus small lateral movements can occur accurately without introducing losses through unwanted vertical movements using a passive mechanical arrangement. It a be used together with active thermal control, to give better compensating accuracy, or compensation for manufacturing variations. An optical component assembly has a substrate having one or more mating profiles, and first and second planar waveguide chips having mating profiles. During assembly, the mating profiles enable passive alignment of an optical coupling between is respective waveguides of the chips. A groove locates a fiber on the chip using passive alignment.
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