Patent ID: 7330651
Filing Date: 2008-02-12
Classification: H01S,H04B

Abstract:
1. An optical transmission system including a plurality of optical amplifying apparatuses connected through an optical transmission line, comprising: the optical transmission line for transmitting a signal light; and the optical amplifying apparatuses for amplifying the signal light, each of which includes an optical detecting unit for detecting an input level of an amplified spontaneous emission (ASE) light, an optical amplifying unit for amplifying the signal light, an optical attenuating unit for adjusting an attenuation level for the signal light, the optical attenuating unit being installed on an input side of the optical amplifying unit; and a supervisory controlling unit for supervising the input level of the ASE light, which is detected by the optical detecting unit, wherein the optical attenuating unit adjusts the attenuation level for the signal light, based on a difference between an output level of the ASE light outputted from the preceding optical amplifying apparatus and the input level of the ASE light inputted thereto, wherein the supervisory controlling unit communicates monitored information between respective optical amplifying apparatuses, and wherein each of the optical amplifying apparatuses includes a supervisory controlling unit by which ASE light information is provided directly from other ones of the supervisory controlling units.