| 摘要 |
PROBLEM TO BE SOLVED: To perform a wavelength dispersion measurement having extremely high wavelength accuracy relative to a transmission medium to be measured. SOLUTION: This device comprises an optical frequency comb generation part for generating an optical frequency comb having a plurality of optical frequency components having fixed optical frequency intervals f and mutually synchronized phases, controlled so that the optical frequency of one optical frequency component in the optical frequency comb becomes always constant, a light modulation means for modulating the optical frequency comb with a smaller frequency f<SB>0</SB>than the optical frequency interval f and inputting modulated light into the transmission medium to be measured, an optical branching filter, a photodetector, a phase difference detection means, and a data processing part. The optical branching filter branches modulated light transmitted through the transmission medium to be measured into each optical frequency component of the optical frequency comb. The photodetector detects individually the optical power of each optical frequency component in the branched optical frequency comb. The phase difference detection means mutually compares and detects the phase difference of the frequency f<SB>0</SB>component in the optical power of each optical frequency component. The data processing part calculates the wavelength dispersion value of the transmission medium to be measured from the relation between the phase difference of the frequency f<SB>0</SB>component and the optical frequency of each branched optical frequency component. COPYRIGHT: (C)2005,JPO&NCIPI
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