| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a means for reducing or removing the effect caused by the phase noise of an interferometer system. <P>SOLUTION: The phase noise can be removed at least partially by using a delay/phase correlation approach against two interferometers 12, 14 in an interferometer system 42. The correlation approach can be used for measuring the group delay 44 of a device to be measured. This approach includes determining differences 46, 48 between an output phase of each interferometer at a time t and the phase of the same output at a time subtracting the delay of the other interferometer from the time t. In an embodiment, a first phase difference is the difference between the phase of the output 52 of a test interferometer at the time t and the phase of the output of a test interferometer at a time offsetting the known delay of a reference interferometer from the time t. A second phase difference is calculated by using the same technique but a time offset is the delay expressing a relative delay of two optical transmissions in the test interferometer. <P>COPYRIGHT: (C)2003,JPO</p> |
