| 摘要 |
PROBLEM TO BE SOLVED: To provide a physical quantity measurement system for eliminating an effect due to a temperature change. SOLUTION: The physical quantity measurement system comprises: an array waveguide diffraction grating 6 including center wavelengths of three or more output channels within a 1/10 loss band of a Bragg diffraction grating 2; and an reflective center wavelength change detecting section 8 for calculating a first group signal from a received optical signal whose center wavelength of the output channel corresponds to the output channel on the short wavelength side of a reflective center wavelength of the Bragg diffraction grating 2, calculating a second group signal from the received optical signal whose center wavelength of the output channel corresponds to the output channel on the long wavelength side of the reflective center wavelength of the Bragg diffraction grating 2, and detecting a change in the reflective center wavelength due to the physical quantity from a differential signal between the first and second group signals. COPYRIGHT: (C)2009,JPO&INPIT
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