Ultrahigh-speed clock extraction circuit
US7024122B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 2002 |
| Grant date | Apr 4, 2006 |
| Priority date | — |
| Expiry date | Sep 22, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L61/50
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In an ultrahigh-speed clock extraction circuit wherein a local pulse generating light source 22 for 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 demultiplier 32 and multipliers 43 and 52 are set so that the frequency of a modulation signal for an optical modulator 41 and 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 photodetector 42 differ from each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.