| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for monitoring optical signal quality deterioration factors which contribute to realization of an economical and reliable optical network having a large communication capacity per service and can accommodate multimedia services having various signal formats and signal bit rates. SOLUTION: The monitoring apparatus 101 has a first and second evaluating parts 105, 107 for obtaining a mean Q-value parameter and waveform deterioration parameters from an optical signal amplitude histogram obtained from an optical signal under test, and a third evaluating part 111 which prescribes both the mean Q-value parameter and the waveform deterioration parameters, to decide whether the main factor of the optical signal quality deterioration is the waveform deterioration or others by comparison, etc., of these parameters, using an initial value or initial characteristics.
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