| 摘要 |
An optical fiber amplification repeater system used in the method are provided which enable monitoring of the optical transmission paths with high accuracy without degradation of transmission characteristics of main signal light and with reduced loss of backward scattering light, in wavelength division multiplexing transmission. In the optical fiber amplification repeater system in which main signal light is received and transmitted between optical wavelength multiplexing end ports through optical fiber amplification repeaters each having upward and downward repeater circuits including an optical fiber amplifier mounted in a pair of upward and downward optical transmission paths and the optical wavelength multiplexing end port having monitoring devices to receive and transmit monitoring optical pulse are provided and optical circulator and optical fiber grating are connected to the optical fiber amplifier. Backward scattering light is guided through the optical circulator to the optical grating and only the backward scattering light of the monitoring optical pulse is output to an opposite optical transmitter path to feed it to the monitoring devices.
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