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:
Mar. 16, 2010
Filed:
Aug. 30, 2006
Hiromi Tsuji, Tokyo, JP;
Hiromi Tsuji, Tokyo, JP;
OKI Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A multi-rate clock signal extracting device includes a light modulator, a photoelectric converter, a band-pass filter unit, a phase comparison unit, a bit rate changeover switch and a modulating electric signal generating unit. The light modulator modulates a light signal according to a modulating electric signal as a mixing signal obtained by mixing an electric signal with frequency f/(2) and an electric signal with frequency Δf so as to output it as a modulated light signal. The modulated light signal is converted into a first electric signal by the photoelectric converter. A second electric signal group with frequency (2)×Δf is generated from signal components with frequencies (2)×Δf included in the modulated light signal by the photoelectric converter and the band-pass filter unit so as to be input into the phase comparison unit. The bit rate changeover switch selects an electric signal corresponding to the bit rate of the light signal so as to input it into a modulating electric signal generating unit. The modulating electric signal generating unit outputs the modulating electric signal.