Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-02-13
2000-11-14
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
385 37, G02B 634
Patent
active
061473413
ABSTRACT:
A compact temperature compensating device for an optical fiber grating includes an inner expansion member disposed concentrically within and in a substantially parallel relationship with an outer expansion member. The outer expansion member has a coefficient of thermal expansion greater than that of the inner expansion member. The device further includes a base member and a pivoting lever. The base member is fixedly attached to a distal end of the outer and inner expansion members and to a distal end of the fiber grating disposed concentrically within the inner expansion member. The lever is connected to a proximal end of the inner and outer expansion members and to a proximal end of the fiber grating through joints that are flexurally deformable so that, as the expansion members expand and contract differentially within an expected temperature range, the lever pivots about the inner expansion member and imparts a desired amount of axial strain in the fiber grating to maintain the grating wavelength substantially constant.
REFERENCES:
patent: 5914972 (1999-06-01), Siala et al.
patent: 5917975 (1999-06-01), Bloom
patent: 5991483 (1999-11-01), Engelberth
Lemaire Paul Joseph
Shepherd Lloyd
Weld John David
Allen Stephone B.
Lucent Technologies - Inc.
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