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:
Aug. 22, 1995
Filed:
Feb. 08, 1993
Katsuji Kaminishi, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An optical transmission apparatus of NRZ modulation system includes a laser driving circuit for deriving a current obtained by adding together an NRZ modulation signal, a D.C. bias, and a clock signal having an amplitude smaller than the bias, a semiconductor laser driven by the laser driving circuit, an optical fiber for transmitting a laser beam from the semiconductor laser to a reception side, a photodetector for detecting a laser beam on the reception side and converting the detected laser beam to an electrical signal, a data regenerating circuit for deriving an NRZ modulation signal from the detected electrical signal, and a clock extracting circuit for extracting the clock signal superposed on the NRZ modulation signal from the detected electrical signal.