| 摘要 |
In a device which extracts an optical interference signal (SA) for analyzing the spectrum of light to be measured, the light (11) to be measured is incident to an optical interferometer (20) capable of sweeping an optical path difference and interference light output therefrom is converted into an electric signal to obtain an optical interference signal (SA). On the other hand, the optical power of the light (11) to be measured is extracted to create an optical power signal, which is provided to a divider, wherein the optical interference signal is divided by the optical power signal to obtain a noise-free optical interference signal.
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