Patent ID: 6088088
Filing Date: 2000-07-11
Classification: G01M

Abstract:
A measurement scheme for isolating dispersive characteristics of an optical component at at least two discrete optical frequencies, comprising the steps of:modulating a first optical carrier at a first modulation frequency to produce a first lower modulation sideband and a first upper modulation sideband;performing a first modulation phase shift measurement on the modulated first optical carrier;modulating a second optical carrier at a second modulation frequency to produce a second lower modulation sideband and a second upper modulation sideband, the frequency of one of the second lower modulation sideband and the second upper modulation sideband coinciding with the frequency of one of the first lower modulation sideband and the first upper modulation sideband;performing a second modulation phase shift measurement on the modulated second optical carrier wherein the one of the second lower modulation sideband and the second upper modulation sideband coinciding in frequency with the one of the first lower modulation sideband and the first upper modulation sideband provides a reference phase term for the first modulation phase shift measurement and the second modulation phase shift measurement; andextracting a first phase term from the reference phase term and the first modulation phase shift measurement and a second phase term from the reference phase term and the second modulation phase shift measurement, the first phase term at the frequency of the first lower modulation sideband and the second phase term at the frequency of the second upper modulation sideband when the frequency of the first upper modulation sideband coincides with the frequency of the second lower modulation sideband, the first phase term at the frequency of the first lower modulation sideband and the second phase term at the frequency of the second lower modulation sideband when the frequency of the first upper modulation sideband coincides with the frequency of the second upper modulation sideband, the first phase term at the frequency of the first upper modulation sideband and the second phase term at the frequency of the second upper modulation sideband when the frequency of the first lower modulation sideband coincides with the frequency of the second lower modulation sideband.