The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 2006
Filed:
Nov. 01, 2002
Kentaro Uchiyama, Shinagawa-ku, JP;
Hidehiko Takara, Yokosuka, JP;
Eiichi Yamada, Sagamihara, JP;
Etsu Hashimoto, Fujisawa, JP;
Toshio Morioka, Yokosuka, JP;
Kentaro Uchiyama, Shinagawa-ku, JP;
Hidehiko Takara, Yokosuka, JP;
Eiichi Yamada, Sagamihara, JP;
Etsu Hashimoto, Fujisawa, JP;
Toshio Morioka, Yokosuka, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
In an ultrahigh-speed clock extraction circuit wherein a local pulse generating light sourcefor 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 demultiplierand multipliersandare set so that the frequency of a modulation signal for an optical modulatorand 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 photodetectordiffer from each other.