Patent ID: 7724435
Filing Date: 2010-05-25
Classification: G02B

Abstract:
1. A method for performing importance sampling in optical polarization measurement, comprising: using a plurality of variable DGD (differential group delay) sections cascaded in series to form an optical path, each variable DGD section operable to produce a variable differential group delay; connecting a polarization controller between two adjacent variable DGD sections in the cascaded plurality of variable DGD sections to control polarization of light transmitting through the optical path; selecting a probability density function, which has a distribution other than a Maxwellian distribution, to generate DGD values for each of the plurality of variable DGD sections; applying DGD values generated by the probability density function to the plurality of variable DGD sections in performing importance sampling measurements; and controlling the polarization controllers, in a way different from controlling of the variable DGD sections and without changing the DGD value distribution among the variable DGD sections, to randomize the polarization state between two adjacent variable DGD sections.