Method and apparatus of clock recovery using optical filters

Details Method and apparatus of clock recovery using optical filters Method and apparatus of clock recovery using optical filters

2007-01-09

2007-01-09

Chan, Jason (Department: 2613)

Optical communications

Transmitter and receiver system

Including synchronization

Reexamination Certificate

active

10444192

ABSTRACT:
A method and apparatus for optical clock recovery using optical filters with fixed reflective wavelengths is provided. In the apparatus, a first filter receives an optical signal and extracts one out of two spectral lines corresponding to two side peaks that are second in magnitude to a peak and exist at both sides of a peak on the spectrum of the received optical signal. A second filter extracts a spectral line corresponding the largest peak on the spectrum of the received optical signal. An attenuator equalizes the power levels of the two spectral lines extracted by the first and second filters. A beating generation unit receives signals corresponding to the two equalized spectral lines and generates beating between the equalized spectral lines, thereby recovering a clock component.

REFERENCES:
patent: 5386311 (1995-01-01), Shields
patent: 5761228 (1998-06-01), Yano
patent: 6728493 (2004-04-01), Whittaker et al.
patent: 7035538 (2006-04-01), Willner et al.
patent: 2004/0208615 (2004-10-01), Kean
Bernd Franz “Optical signal processing for very high speed (>40Gbit/s) ETDM binary NRZ clock recovery” ALCATEL Corporate Research Center-Optical Systems and Networks; copyright 2000 Optical Society of America (MG1-1 - MG1-3).

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