| 摘要 |
The wavelength of light modulated according to a modulating signal is monitored by generating criterion light having a stable wavelength, combining part of the modulated light with the criterion light, comparing the combined light with the modulating signal, and calculating an error rate indicating how frequently the combined light disagrees with the modulating signal. A high error rate indicates that the modulated light has the same wavelength as the criterion light, leading to interference when the two are combined. In a monitoring system, an alarm signal is output if the error rate is too low. In a wavelength stabilizing system, the wavelength of the modulated light is controlled so as to maximize the error rate.
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