Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1993-01-04
1994-01-25
Lerner, Martin
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359250, 359259, 385 2, G02F 103, G02F 1035
Patent
active
052820769
ABSTRACT:
A device for compensating for changes in temperature and strain in electro-optic modulators without altering the voltage field effects. Devices for modulating light intensity in response to a varying electrical signal are particularly useful with optical fiber information sensing systems. Such modulators basically receive a light signal, collimate and polarize the light, then pass it through a wave plate to cause circular polarization. The light signal then is passed through a modulator material which rotates the beam polarization in response to varying voltage signals imposed on the modulator. Unfortunately, changes in temperature and strain also change the state of polarization. I have now found that by transmitting the light signal through two equal crystals in series that are rotated 180.degree. from each other, a uniform strain or temperature change will result in canceled polarization effects. Thus, effects of changes in temperature and/or strain are canceled without affecting the voltage field effects.
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Gilliam Frank D.
Lerner Martin
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