Ultrahigh-speed clock extraction circuit

Details Ultrahigh-speed clock extraction circuit Ultrahigh-speed clock extraction circuit

2006-04-04

2006-04-04

Leung, Christina Y (Department: 2633)

Optical communications

Transmitter and receiver system

Including synchronization

C398S163000

Reexamination Certificate

active

07024122

ABSTRACT:
In an ultrahigh-speed clock extraction circuit wherein a local pulse generating light source22for generating a local optical pulse stream synchronized in bit phase with an input optical signal pulse stream is placed in a phase-locked loop, when repetition frequencies of the input optical signal pulse stream and the local optical pulse stream bear a particular relationship, a frequency demultiplier32and multipliers43and52are set so that the frequency of a modulation signal for an optical modulator41and a frequency which is a natural-number multiple of the modulation signal frequency, and the frequency of a down-converted version of an optical pulse stream output from a photodetector42differ from each other.

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Patent Abstracts of Japan, JP 10-209962, Aug. 7, 1998.
I. D. Phillips, et al., Electronics Letters, vol. 36, No. 7, XP-006015059, pp. 650-651, “100 Gbit/s Optical Clock Recovery Using Electrical Phaselocked Loop Consisting of Commercially Available Components”, Mar. 30, 2000.
K. Uchiyama, et al., “All-Optical Time-Division Demultiplexing Experiment With Simultaneous Output of All Constituent Channels From 100Gbit/s OTDM Signal”, Electronics Letters, vol. 37, No. 10, May 10, 2001, pp. 1-2.
Kentaro Uchiyama, et al., “160-Gbit/s All-Optical Time-Division Demultiplexing Utilizing Modified Multiple-Output OTDM Demultiplexer (MOXIC)”, Electronics Letters, vol. 38, No. 20, 10 pages.

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