Patent ID: 7609386

Claim:
An optical characteristic measuring apparatus for measuring an optical characteristic of a measuring object, the optical characteristic measuring apparatus comprising: a first wavelength variable light source which sweeps a wavelength of a first input light and outputs the first input light to an interference section; a second wavelength variable light source which sweeps a wavelength of a second input light and outputs the second input light to the interference section, frequencies of the first input light and the second input light being different from each other and polarized states of the first input light and the second input light being perpendicular to each other; the interference section which multiplexes and inputs the first input light and the second input light to the measuring object, makes output light from the measuring object interfere with at least one of the first input light and the second input light, and outputs a plurality of interference lights; a detecting section for detecting a frequency difference of the first input light and the second input light from the first wavelength variable light source and the second wavelength variable light source; and a control section for controlling a frequency difference of the first wavelength variable light source and the second wavelength variable light source based on the frequency difference detected by the detecting section.