Optical heterodyne receiver

Details Optical heterodyne receiver Optical heterodyne receiver

1987-06-29

1989-08-08

Safourek, Benedict V.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455611, H04B 900

Patent

active

048560936

ABSTRACT:
Optical heterodyne receivers for ASK-, PSK-, FSK-, and DPSK-modulated signals are disclosed which contain a polarization controller. The receiver contains a unit (Q, Q') which works on the difference-detector principle to eliminate the shot noise of the local oscillator (LO), which emits circularly polarized light. It further includes a quadrature demodulator (D, D', D") which, besides delivering the useful signal (N), provides polarization control signals (S.sub.E, S.sub.W) with which the ellipticity and the polarization angle of the received light (E.sub.S) are adjusted in such a way that the received light (E.sub.S) is linearly polarized at an angle of 45.degree. or 135.degree..

REFERENCES:
patent: 3971930 (1976-07-01), Fitzmaurice et al.
patent: 4718120 (1988-01-01), Tzeng
"Electronics Letters", Sep. 12th, 1985, vol. 21; No. 19; Hodgkinson et al.; Demodulation of Optical DPSK Using In-phase and Quadrature Detection; pp. 867-868.

Affiliated with

Also associated with

Rating

Optical heterodyne receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical heterodyne receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical heterodyne receiver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-912462