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:
Oct. 28, 2008
Filed:
Sep. 03, 2004
Koji Kikushima, Ichikawa, JP;
Koji Kikushima, Ichikawa, JP;
Abstract
The optical signal receiver of this invention is an optical signal receiver that receives and frequency-demodulates an optical signal, comprising: an optical branch device for splitting an input optical signal into two optical signals (); an optical delay line for delaying one of the two branched optical signals (); a first photoelectric conversion circuit () for converting the optical signal from the optical delay line into the first electrical signal (); a second photoelectric conversion circuit () for converting the other optical signal of the two branched optical signals into a second electrical signal; the rectangular-wave forming circuit () for outputting a single rectangular-wave signal using the first electrical signal from the first photoelectric conversion circuit and the second electrical signal from the second photoelectric conversion circuit as inputs; and a smoothing circuit () for smoothing the rectangular-wave signal from the rectangular-wave forming circuit.