Optical mixing for heterodyne detection

Details Optical mixing for heterodyne detection Optical mixing for heterodyne detection

1991-06-14

1992-12-08

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359189, H04B 1006

Patent

active

051702754

ABSTRACT:
A transmitted (TX) signal received from the remote location is mixed in a polarization resolving beam splitter (10) with a local oscillator (LO) signal from a laser (15). The LO and TX signal components emerging from the beam splitter (10) are orthogonally polarized, but their polarization states are brought into alignment by passage through two birefringent elements (19, 20) before falling on two photodetectors (17, 18). Adjustment of a polarization controller (16) ensures that approximately equal LO power falls on each photodetector.

REFERENCES:
patent: 4718120 (1988-01-01), Tzeng
patent: 4723317 (1988-02-01), Glance
patent: 4958918 (1990-09-01), Walker
patent: 5027436 (1991-06-01), Delavaux

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