Method of evaluating fiber PMD using polarization optical time domain reflectometry
First Claim
1. A method for measuring polarization mode dispersion in an optical fiber comprising:
- emitting a pulse of radiation into a length of optical fiber;
measuring radiation which is backscattered back through the fiber from said pulse radiation;
analyzing the variation of intensity level of said measured backscattered radiation and relating the level of variation of intensity level to the polarization mode dispersion (PMD) in said fiber, wherein said analyzing step comprises analyzing the variation of intensity over a sliding window of data and moving said window of data lengthwise along the length of the fiber while continuing to analyze said variation of intensity to thereby produce information related to the local variation in intensity along the length of the fiber.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for screening fiber polarization mode dispersion using a polarization optical time domain reflectometer. A pulse radiation is emitted into the fiber under test, and the backscattered radiation is measured by the POTDR and used to obtain a POTDR trace. The POTDR trace is then analyzed to compare the variation of signals along the length of the fiber, the variation in signals relating to the level of PMD along the length of the fiber. Because high levels of PMD correspond to localized levels of low variability, by setting the variability of signal threshold sufficiently low, fibers having unacceptably high localized PMD can be identified and removed.
31 Citations
18 Claims
-
1. A method for measuring polarization mode dispersion in an optical fiber comprising:
-
emitting a pulse of radiation into a length of optical fiber;
measuring radiation which is backscattered back through the fiber from said pulse radiation;
analyzing the variation of intensity level of said measured backscattered radiation and relating the level of variation of intensity level to the polarization mode dispersion (PMD) in said fiber, wherein said analyzing step comprises analyzing the variation of intensity over a sliding window of data and moving said window of data lengthwise along the length of the fiber while continuing to analyze said variation of intensity to thereby produce information related to the local variation in intensity along the length of the fiber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
Specification