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:
Sep. 10, 1996
Filed:
Apr. 07, 1993
Keiji Tomooka, Yokohama, JP;
Naohiro Sakakida, Kawasaki, JP;
Shin Nishimura, Yokohama, JP;
Yoshihiro Ashi, Yokohama, JP;
Hironari Matsuda, Yokohama, JP;
Satoshi Aoki, Chigasaki, JP;
Yukio Nakano, Zama, JP;
Masahiro Takatori, Hachiouji, JP;
Toru Kazawa, Kokubunji, JP;
Shinya Sasaki, Kodaira, JP;
Ryoji Takeyari, Koganei, JP;
Hiroyuki Nakano, Asaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical transmission system accomplishes optical transmission to a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the optical transmission to a short distance by directly connecting the linear terminals therebetween, with an electric-to-optic converter replaced by an electric-to-optic converter having a semiconductor amplifier, with an optic-to-electric converter by an optic-to-electric converter having an avalanche photodiode as light receiver, an with no use of any optical booster amplifier and optical preamplifier in the multiplexing line terminal. With these, the optical transmission system can be easily constructed depending on the transmission distance required.