Wavelength characteristic measurement apparatus
AssigneeAndo Electric Co., Ltd.
InventorsTohru Mori, Takashi Iwasaki
Life of this patent
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Abstract
An optical spectrum analyzer 100 and a wavelength variable light source 101 have each a sweep synchronization start function. A correction function of the rotation speed of a motor 106 for varying the angle of a diffraction grating in a spectroscope 104 so that extracted wavelength and output signal light wavelength match over a setup sweep wavelength range is found from the output signal light wavelength characteristic relative to the rotation angle of a spectral element 119 and the extracted wavelength of the spectroscope 104, and the rotation angle of motor 106 for driving the spectroscope 104 is varied for each setup wavelength in accordance with the correction function, then sweep is performed.
Claims7
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.
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 element for extracting a specific wavelength component from the measured light, the first spectral element having a wavelength transmission characteristic wherein the maximum transmission quantities are flat over a predetermined wavelength range preceding and following the extracted wavelength as the center relative to a preset resolution;
- and
- first drive means for varying the angle of the first spectral element and sweeping the extracted wavelength over a predetermined sweep wavelength range,
- the wavelength variable light source comprises:
- an external oscillator comprising:
- 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 and sweeping the signal light wavelength of the signal light over the sweep wavelength range,
- wherein rotation speeds of the first and second motors for varying the angles of the first and second spectral elements respectively are previously determined no gather and bundle the signal light wavelength in the predetermined wavelength range and the first and second drive means rotate the first a second motors at uniform rate in accordance with the rotation speeds.
Dependencies are inferred from the claim text.