Patent ID: 6633380
Filing Date: 2003-10-14
Classification: G01J

Abstract:
A wavelength characteristic measurement apparatus for measuring an optical wavelength characteristic of an measured object comprising:a wavelength variable light source for outputting signal light; and an optical spectrum analyzer for measuring a spectral distribution of measured light provided by making the signal light incident on the measured object, wherein the optical spectrum analyzer comprises: a first spectral clement for extracting a specific wavelength component from the measured light; and first drive means for varying the angle of the first spectral element, the first driving means for sweeping the extracted wavelength over a predetermined sweep wavelength range, wherein the wavelength variable light source comprises: an external oscillator having: a laser element for outputting single mode signal light as the signal light; and a second spectral element for causing the laser element to lase at an arbitrary wavelength; and second drive means for varying the angle of the second spectral element, the second drive means for sweeping the signal light wavelength of the signal light over the sweep wavelength range, wherein each of the first and second drive means comprises means for synchronizing the sweep start with each other, wherein the first and second drive means vary and control the rotation angle of the first or second spectral element in accordance with a rotation correction function derived from an extracted wavelength characteristic relative to the rotation angle of the first spectral element and a signal light wavelength characteristic relative to the rotation angle of the second spectral element to match the extracted wavelength and the signal light wavelength with the sweep wavelength range.