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:
Feb. 29, 2000
Filed:
May. 06, 1997
Atsuhiko Utsumi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A method, device, and system for controlling the wavelength of an optical signal. For example, the system includes an E/O converter for converting an input electrical signal into an optical signal, an optical band-pass filter to which the optical signal is supplied, an O/E converter for converting the optical signal passed through the filter into an output electrical signal, a detecting unit for detecting a bit error of the output electrical signal, and a control unit for controlling a parameter (e.g., temperature of a laser diode) on which the wavelength of the optical signal depends so that the bit error detected decreases. In this system, the wavelength of the optical signal is maintained constant, so that a degradation in transmission quality due to wavelength changes is prevented.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile