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:
Jan. 17, 1995
Filed:
Jun. 01, 1993
Fujitsu Limited, Kawasaki, JP;
Abstract
A supervisory and control signal transmitting system for use in an optically amplifying repeater system amplifies attenuated light and for transmitting data over a long distance between a transmitting station and a receiving station through a plurality of repeaters. The supervisory and control signal transmitting system comprises a sub signal superimposing portion for superimposing both a sub signal with a carrier frequency modulated by a supervisory and control signal and a modulation factor stabilizing signal with a different frequency thereof on an optical main signal modulated corresponding to transmission data, a transmitter sub signal superimposing portion for monitoring the output of the sub signal superimposing portion and for controlling the sub signal superimposing portion so as to stabilize the modulation factor of the sub signal to be superimposed, a modulating portion for receiving the output of the transmitter sub signal superimposing portion, and a stabilizing signal erasing portion for monitoring the output of the modulating portion, for extracting the frequency component of the modulation factor stabilizing signal, and for driving the modulating portion so as to erase the stabilizing signal from the output of the modulating portion.