Optical communications – Transmitter and receiver system – Including synchronization
Reexamination Certificate
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.
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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).
Ko Je-soo
Lee Jae-myoung
Blakely & Sokoloff, Taylor & Zafman
Chan Jason
Electronics and Telecommunications Research Institute
Wang Quan-Zhen
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