| 摘要 |
A CATV station apparatus 100 subjects received optical signals to processes of optical-electrical conversion, signal separation, coupling, and demodulation for obtaining an uplink signal. A received photocurrent monitoring section 170 compares a received photocurrent at a optical receiving section 110 with a predetermined reference current. If the received photocurrent is equal to or higher than the reference current, an amplifying section 130 amplifies a signal output from a signal separating section 120 at a predetermined level. If the received photocurrent is lower than the reference current, on the other hand, it is determined that a non-linear phenomenon, such as stimulated Brillouin scattering, has occurred in an optical fiber 200 . The amplifying section 130 then outputs a signal at a level which does not affect, even after being coupled with other signals, communications performed by other optical transmission systems.
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