| 摘要 |
PROBLEM TO BE SOLVED: To provide a device and a method which determine an absolute wavelength of an optical signal by the following process, a determination of a coarse wavelength response and a fine wavelength response is made, then, the absolute wavelength is obtained by combining the above two wavelength responses. SOLUTION: This device determines the wavelength of the optical signal from the coarse wavelength response and the fine wavelength response. The coarse wavelength response is obtained by an optical filter. An appropriate detector detects the response of a wavelength dependency and transmits it to a processing logic. The fine wavelength response is sensed by using an interferometer which can make an interference pattern. The two detectors are set transversely with a distance within the interference pattern and detect an intensity response at each position. The intensity response is transmitted to a unit which determines the fine wavelength response. Finally, the wavelength is determined in the processing logic by using the determined coarse wavelength response and fine wavelength response. COPYRIGHT: (C)2004,JPO&NCIPI
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