Temperature compensated fiber optic bypass switch
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United States of America Patent
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Jul 3, 1990
Grant Date -
N/A
app pub date -
Apr 3, 1989
filing date -
Apr 3, 1989
priority date (Note) -
Expired
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Abstract
A variable refractive index device, such as a Bragg cell, is temperature stabilized by sensing ray path deviations of a secondary diffracted beam. Two photodetectors with centers offset from the exit position of the central ray of the beam at normal temperature operation receive light energy as a function of the deviation of this ray path from the normal position. Light in each fiber is detected to derive electrical signals that are utilized to establish a correction signal to a voltage controlled oscillator which varies the frequency thereof and compensates for the diffraction deviations caused by temperature variations.
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