Optical amplification apparatus, optical communication apparatus, and optical communication method

摘要

A Raman amplifier (111) inputs pump light into an optical fiber (transmission path (101)) through which an optical signal passes, to amplify the optical signal. An optical receiving unit (114) is provided downstream of the Raman amplifier (111) and monitors the power of the optical signal amplified by the Raman amplifier (111). A calculating unit (116) determines Raman amplification gain based on the power of the optical signal monitored by the optical receiving unit (114), and calculates the power of a noise component included in the optical signal based on the gain. The calculating unit (116), in real-time, calculates the power, which varies in complicated manners depending on conditions, and outputs information concerning to the power to another apparatus at a frequency on the order of milliseconds. The power of the noise component is substracted from the power of the received optical signal in order to calculate the power of the signal component. Power control of the amplifier is carried out based on the power calculated for the signal component.