Patent ID: 7522273
Filing Date: 2009-04-21
Classification: G01M

Abstract:
1. An optical characteristic measuring instrument that measures an optical characteristic of a device under test, comprising: a polarization separator that receives light emitted from the device under test, separates the received light into p-polarized light and s-polarized light, and outputs the p-polarized light and s-polarized light; a light generator that generates incident light; an optical modulator that applies intensity modulation to the incident light, and emits modulated light; a light inputter that makes the incident light which has undergone the intensity modulation incident on the device under test, wherein the incident light is coincident with a p-polarization axis and an s-polarization axis of said polarization separator; a first measurer that measures a phase shift equivalent value and an amplitude equivalent value of the incident light based upon the output from said polarization separator; a second measurer that measures a phase shift equivalent value of the incident light based upon the light emitted from the device under test; and an optical characteristic measurer that measures the optical characteristic of the device under test based upon the measured results by said first measurer and said second measurer, wherein the optical characteristic measurer measures the optical characteristic of the device under test based upon the measured result by said second measurer, if there is a deviation between a p-polarization component of the amplitude equivalent value of the incident light and an s-polarization component of the amplitude equivalent value of the incident light, and the measured result by said second measurer is not changed in accordance with the measured result by said first measurer.