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. 03, 2004
Filed:
Nov. 06, 2000
Akira Sasaki, Chiba, JP;
Shigeru Shikii, Aichi, JP;
Hirokazu Ishimatsu, Tokyo, JP;
Naomi Oohashi, Kanagawa, JP;
Katsuhiro Ishimura, Chiba, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
An optical transmission system according to the present invention includes a connection confirming circuit for confirming connection of an input data signal, a test signal generator for generating a test signal, and a switching device on a transmitter side. The switching device selectively generates the input data signal from an output terminal in the case where the input data signal is detected by the connection confirming circuit , and the test signal when the input data signal is not detected. An output of the switching device is connected to an optical transmitter TX. On a receiver side, there is provided a determination circuit for receiving an optical signal from a transmission path and detecting the test signal to determine transmission characteristics of the transmission path on the basis of the test signal.