Optics: measuring and testing – By light interference – Using fiber or waveguide interferometer
Reexamination Certificate
2005-05-31
2005-05-31
Toatley, Jr., Gregory J. (Department: 2877)
Optics: measuring and testing
By light interference
Using fiber or waveguide interferometer
C356S073100, C356S613000, C356S479000, C356S484000, C356S486000, C356S617000, C324S613000, C324S617000
Reexamination Certificate
active
06900895
ABSTRACT:
Phase noise is at least partially cancelled for an interferometric system by using a delay/phase cross-correlation approach for two interferometers within the system. The cross-correlation approach may be used in measuring group delay of a device under test and includes determining the differences between the phase of the output of each interferometer at time t and the phase of the same output at the time t minus the delay of the other interferometer. In one embodiment, the first phase difference is the difference between the phase of a test interferometer output at time t and the phase of the test interferometer output at the time t offset by the known delay of a reference interferometer. The second phase difference is calculated using the same technique, but the time offset is a delay representative of the relative delay of two light propagations within the test interferometer. A noise-cancelled time series output that is indicative of group delay can then be generated by determining the difference between the first and second differences.
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Agilent Technologie,s Inc.
Brown Khaled
Toatley , Jr. Gregory J.
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