Direct detecting of optical PSK signals

Details Direct detecting of optical PSK signals Direct detecting of optical PSK signals

1992-08-11

1994-10-11

Olms, Douglas W.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359189, H04B 1006

Patent

active

053552431

ABSTRACT:
A self homodyne direct detection optical transmission system includes a transmitter in which binary data signals are converted into double differential phase shift keyed (DDPSK) optical signals. The receiver includes a two-path optical interferometer, having a path unbalance optical delay substantially equal to 1 bit period, to which received DDPSK signals are applied. The interferometer output is converted into a plurality of balanced phase diversity outputs. From each of the phase diversity outputs a replica of the binary data signals is recovered and the replica signals are combined to form an output binary data signal.

REFERENCES:
patent: 5148128 (1992-09-01), Mazumder
patent: 5181136 (1993-01-01), Kavehrad et al.
DeKrom, `Impct of Laser Phase Noise on the Performance of a {3.times.3} Phase and Polarization Diversity Optical Homodyne DPSK receiver`, Journal of Lightwave Technology vol. 8 No. 11 Nov. 1990, 1709-1715.
Neelakanta et al. `Light-Emitting Diode as Radio-Frequency Detector: Development of RFI-Free Electromagnetic Field Sensor` Electronics Letters, Nov. 9, 1989 vol. 25 No. 23, 1606-1608.

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