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:
May. 27, 2008
Filed:
Jul. 05, 2004
Hiroji Masuda, Yokosuka, JP;
Hiroto Kawakami, Yokosuka, JP;
Yutaka Miyamoto, Yokohama, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
An optical fiber communication system is provided which uses remote pumping that is capable of improving pumping efficiency and reducing a noise figure. A coupler () of a linear repeater () couples signal light to pumping light outputted from a pumping light source (). The outputted signal light and pumping light reach a linear repeater () through transmission fibers (to) and remote pumping modules (F andR). A coupler () of the linear repeater () couples the signal light to the pumping light supplied from a pumping light source (), to output the signal light and the pumping light to the transmission fiber (). The remote pumping module (F) divides the pumping light propagated in the transmission fiber (), from the signal light. The remote pumping moduleF branches the divided pumping light in two directions with a predetermined ratio. After branching, each of the branched pumping light is coupled to the signal light to be supplied to both ends of an erbium-doped fiber. The remote pumping module (R) is similar in structure to the remote pumping module (F).