Digital phase estimator, digital phase locked loop and...

Details Digital phase estimator, digital phase locked loop and... Digital phase estimator, digital phase locked loop and...

2011-06-28

2011-06-28

Singh, Dalzid (Department: 2613)

Optical communications

Receiver

C398S025000, C398S208000

Reexamination Certificate

active

07970290

ABSTRACT:
The present invention provides a digital phase estimator, a digital phase locked loop and an optical coherent receiver. The optical coherent receiver comprises a local oscillator laser, for supplying a local oscillator optical signal; an optical 90 degree frequency mixer, for mixing a received optical signal with the local oscillator optical signal; first and second balancing photoelectric detectors, for converting the optical signals outputted from the optical 90 degree frequency mixer into baseband electrical signals; first and second A/D converters, for respectively converting output signals from the first and the second balancing photoelectric detectors into digital signals; a digital phase locked loop, for compensating a phase difference between a carrier signal of the received optical signal and the local oscillator optical signal, and outputting the compensated signal; and a data recovering unit, for recovering data from the compensated signal.

REFERENCES:
patent: 6366574 (2002-04-01), Baissus et al.
patent: 2007/0041474 (2007-02-01), Gurney et al.
Ly-Gagnon, D. et al., Unrepeated 210-km Transmission with Coherent Detection and Digital Signal Processing of 20-Gb/s QPSK Signal, University of Tokyo, Tokyo, Japan (3 pages), 2005.
Kazovsky, L., Decision-Driven Phase-Locked Loop for Optical Homodyne Receivers: Performance Analysis and Laser Linewidth Requirements, Journal of Lightwave Technology, vol. LT-3, No. 6, Dec. 1985.
Proakis, John G.,Digital Communications, Fourth Edition McGraw-Hill, Inc., table of contents including pp. xi-xvii, pp. 342-343 (6 pages), 1983.

Affiliated with

Also associated with

Rating

Digital phase estimator, digital phase locked loop and... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital phase estimator, digital phase locked loop and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital phase estimator, digital phase locked loop and... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2702647