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:
Mar. 19, 1996
Filed:
Feb. 26, 1993
Hideaki Tsushima, Wakou, JP;
Shinya Sasaki, Kodaira, JP;
Yukio Nakano, Zama, JP;
Hiroyuki Nakano, Asaka, JP;
Ryoji Tateyari, Koganei, JP;
Hironari Matsuda, Yokohama, JP;
Kenji Tomooka, Yokohama, JP;
Naohiro Sakakida, Kawasaki, JP;
Shin Nishimura, Yokohama, JP;
Yoshihiro Yano, Yokohama, JP;
Youichi Igarashi, Yokosuka, JP;
Satoshi Aoki, Chigasaki, JP;
Masahiro Takatori, Hachiouji, JP;
Tohru Kazawa, Kokubunji, JP;
Yoshihiro Ashi, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical repeater for realizing transmission of supervisory information of an optical fiber transmission system without the output power of an optical fiber amplifier being reduced, wherein a supervisory optical transmitter and optical receiver with a wavelength which is similar to the wavelength of the pumping light source of the optical fiber amplifier are mounted, and on the input side of the optical repeater, pumping light is multiplexed in the forward direction and a supervisory optical signal, which is multiplexed in wavelength and transmitted, is demultiplexed simultaneously by the first wavelength multi- and demultiplexer and they are received by the supervisory optical receiver, and on the output side of the optical repeater, pumping light is muitiplexed in the reverse direction and a supervisory optical signal outputted from the supervisory optical transmitter is multiplexed by the second wavelength multi- and demultiplexer.