Optics: measuring and testing – For optical fiber or waveguide inspection
Reexamination Certificate
2011-04-05
2011-04-05
Chowdhury, Tarifur (Department: 2886)
Optics: measuring and testing
For optical fiber or waveguide inspection
C356S364000, C356S370000
Reexamination Certificate
active
07920253
ABSTRACT:
In a method of measuring cumulative polarization mode dispersion (PMD) along the length of a fiber-under-test (FUT), a polarization-sensitive optical time domain reflectometer (POTDR) is used to inject into the FUT plural series of light pulses arranged in several groups. Each group comprises at least two series having closely-spaced wavelengths and the same state of polarization (SOP). At least two of such groups are injected and corresponding OTDR traces obtained for each series by averaging the impulse-response signals of the several series in the group. The process is repeated for a number of groups. The PMD is obtained by normalizing the OTDR traces of all of the groups, then computing the difference between each normalized OTDR trace in one group and the corresponding normalized OTDR trace in another group, followed by the mean-square value of the differences. Finally, the PMD is computed as a predetermined function of the mean-square difference.
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Chen Hongxin
Cyr Normand
Adams Thomas
Chowdhury Tarifur
EXFO Inc.
Stock, Jr. Gordon J
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