Optical amplification apparatus using Raman amplification

摘要

An object of the invention is to provide an optical amplification apparatus using Raman amplification, which can reliably judge an input interruption of signal light and can shut down the supply of excitation light in accordance with a judged input interruption of the signal light. The apparatus comprises a first optical amplifying means for Raman amplifying signal light propagated through a Raman amplification medium which is connected thereto via a connector, wherein said first optical amplifying means comprises: a transmission excitation light power detection section for detecting the power of excitation light supplied to said Raman amplification medium; a reflection excitation light power detection section for detecting the power of reflection light generated as a result that the excitation light supplied to said Raman amplification medium is reflected by an end face of the connector; and a safety light control section for judging, based on each detection result from said transmission excitation light power detection section and said reflection excitation light power detection section, whether said connector is normally connected or not, and setting the excitation light power accordingly.