Polarization deversity heterodyne receiver of a baseband combini

Details Polarization deversity heterodyne receiver of a baseband combini Polarization deversity heterodyne receiver of a baseband combini

1990-03-28

1992-08-11

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359189, H04B 1006

Patent

active

051384760

ABSTRACT:
In a polarization diversity heterodyne receiving device comprising a first arrangement (16 to 18, 21 to 24, 26, 27) for receiving an incident signal beam having an incident beam intensity and an incident state of polarization to produce IF signals having signal amplitudes and a second arrangement (31, 32) for demodulating the IF signals into baseband signals which are combined into a device output signal having an output amplitude independent of the incident state, a comparing arrangement (34 to 36) produces a control signal which is feedback supplied to the first arrangement to adjust the signal amplitudes in a common ratio so as to render the output amplitude independent of the incident beam intensity. Preferably, the first arrangement comprises a unit (16 to 18, 21, 22) for detecting the incident signal beam to produce detected signals, IF amplifiers for amplifying the detected signals into amplifier output signals, and gain adjusters for giving first and second gains to the respective amplifier output signals to produce the IF signals. The control signal is delivered to the gain adjusters to adjust the first and the second gains. Alternatively, the control signal is used to control optical detectors for detecting into the detected signals optical beams which comprise orthogonally polarized components of a coupled beam consisting of the incident signal beam and a local oscillation beam.

REFERENCES:
Smith, "Techniques for Multigigabit Coherent Optical Transmission", Journal of Lightwave Technology, vol. LT-5, No. 10, pp. 1466-1478, Oct. '87.
K. Emura et al, "Novel Optical FSK Heterodyne Single Filter Detection System Using A Directly Modulated DFB-Laser Diode", Electronics Letters, vol. 20, No. 24, Nov. 22, 1984, pp. 1022-1023.
Davis et al, "Coherent Optical Receiver for 680 Mbit/s Using Phase Diversity", Electronics Letters, vol. 22, No. 1, Jan. 2, 1986, p. 10.

Affiliated with

Also associated with

Rating

Polarization deversity heterodyne receiver of a baseband combini does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-351369