Rotating waveplate system with averaging of the detected signal

Details Rotating waveplate system with averaging of the detected signal Rotating waveplate system with averaging of the detected signal

1994-01-21

1995-08-08

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 33, G02F 101

Patent

active

054401178

ABSTRACT:
A polarization-independent optical detection apparatus for measuring light output from optical fibers comprises an optical detector having an input port for receiving input light by way of an optical path and an output for a corresponding detection signal. A polarization-transformation element is rotatably mounted in the optical path so that the input light passes through the element to reach the input port. A drive motor rotates the polarization-transformation element in a plane extending transversely of the optical path. The polarization-transforming element is selected to transform the polarization state of the input light reaching the detector, as the element spins, so that, for any given input polarization state, the time averaged electrical signal from the detector is approximately the average electrical signal from the detector over all input polarization states.

REFERENCES:
patent: 3917408 (1975-11-01), Stachnik
patent: 3982204 (1976-09-01), Andringa
patent: 4171908 (1979-10-01), Robert et al.
patent: 4654529 (1987-03-01), Boulay et al.
patent: 5076696 (1991-12-01), Cohn et al.
patent: 5329357 (1994-07-01), Bernoux et al.
High-Resolution Measurement of Polarization Dependent Loss, Bruce M. Nyman and Gregory Wolter, IEEE Photonics Technology Letters, vol. 5, No. 7, Jul. 1993.

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