| 摘要 |
An optical amplifier and an optical multiplexing transmission system using the same are disclosed. Automatic restoration of the operation becomes possible and malfunctioning of an APSD function is prevented. The optical amplifier using Raman amplification includes; a Raman excitation light source for generating Raman light; and a detection circuit for detecting a signal error in an OSC (optical supervisory channel) signal transmitted in addition to optical transmission signal. When the detection circuit detects a bit error in the OSC signal, an output power from Raman excitation light source is controlled so as not to injure the human body.
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