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. 10, 2011
Filed:
Nov. 28, 2007
Hiroyuki Nakano, Yokohama, JP;
Hiroshi Takeuchi, Tokyo, JP;
Hiroshi Masuda, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical transmission apparatus including an optical amplifier for providing a high-power optical amplifier on the receive side, in which a wavelength of pumping light for an optical amplifier on the transmission side is suitably shifted to be different from a wavelength of pumping light for an optical amplifier on the receive side, pumping optical power for the optical amplifier on the transmission side is not all consumed in a doped fiber in amplification process, and remnant pump light that was left surplus is added by a wavelength multiplex coupler to the pumping light for the optical amplifier on the receive side, thereby enhancing a gain and light output without an increase in output power of the pumping light used for the optical amplifier on the receive side.