| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical communication apparatus in which at least two optical circuits cascaded by an optical fiber are included in a signal transfer system, transmission/reception is performed via a transmission line and a failure point is easily identified.SOLUTION: In a disconnection failure of an optical transmission line 50, a Raman amplifier 10 generates main and supervisory signal loss alarms, an optical amplifier 11 generates a main signal loss alarm, and a supervisory signal transmission and reception part 14 detects the supervisory signal loss. Meanwhile, in a failure 100 generated in an optical fiber 15, the supervisory signal transmission and reception part 14 performs automatic power reduction (APR) control. Thus, an optical amplifier 23 stops outputting the main signal and continues to output the supervisory signal. The Raman amplifier 10 generates the main signal loss alarm but does not detect the supervisory signal loss, and the optical amplifier 11 generates the main signal loss alarm, and the supervisory signal transmission and reception part 14 detects the loss of supervisory signal. A monitoring part 17 identifies a failure point according to a combination of an existence of the signal loss alarm by the Raman and optical amplifiers 10 and 11 and the supervisory signal loss detection by the supervisory signal transmission and reception part 14. |
