Patent ID: 8248689
Filing Date: 2012-08-21
Classification: H01S

Abstract:
1. A distributed Raman amplifying system, comprising: a pump light source coupled to one end side, the other end side, or both end sides of an optical transmission path, which supplies pump light to amplify light transmitted through the optical transmission path by distributed Raman amplification to the optical transmission path; a first light monitor which monitors powers of main signal light and optical supervisory channel light input to the optical transmission path from the one end side of the optical transmission path; a second light monitor which monitors powers of light wavelength bands of the main signal light and the optical supervisory channel light output from the other end side of the optical transmission path; a reference light transmitter coupled to the one end side of the optical transmission path which supplies reference light of which wavelength is set within a gain band of the distributed Raman amplification and out of a wavelength band of the main signal light to the optical transmission path; a first reference light monitor which monitors a power of the reference light input to the optical transmission path from one end side of the optical transmission path; a second reference light monitor which monitors the power of the reference light output from the other end side of the optical transmission path; and a processor which controls the supply of the pump light in the pump light source as well as supervising a state of the optical transmission path, based on monitor results from the first and second light monitors and monitor results in the first and second reference light monitors.