| 摘要 |
<P>PROBLEM TO BE SOLVED: To precisely calculate the power of a noise component included in an optical signal at a high speed. <P>SOLUTION: 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 to another apparatus at a frequency on the order of milliseconds. <P>COPYRIGHT: (C)2009,JPO&INPIT |
