Method of evaluating fiber pmd using potdr trace

a fiber and trace technology, applied in the field of optical fibers, can solve the problems of limiting the transmission rate of pulses or the maximum distance of concatenated fiber medium, affecting the economic benefits of fiber makers, and causing significant financial losses
US20070046928A1Inactive Publication Date: 2007-03-01CORNING INC
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
CORNING INC
Publication Date
2007-03-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for screening fiber polarization mode dispersion using a polarization optical time domain reflectometer is disclosed. A pulse radiation is emitted into an end of the fiber under test, and the backscattered radiation is measured by the POTDR and used to obtain an OTDR trace. A pulse radiation is emitted into an opposite end of the fiber under test, and the backscattered radiation is measured by the POTDR and used to obtain another OTDR trace. Either one or both traces are analyzed to compare the variation of intensity of signals along the length of the fiber, the variation in signals relating to the PMD along the length of the fiber.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates generally to optical fibers, and particularly to a method for identifying optical fibers which exhibit elevated polarization mode dispersion (PMD).

[0003] 2. Technical Background

[0004] PMD is an important factor in the design of state-of-art fiber optic transmission systems. The effect of PMD in fiber systems is evident when, after propagating a sufficient distance in the network, one digital pulse may spread in the time domain and become indistinguishable from a nearby pulse. The pulse spreading from PMD can introduce errors into the data transmission, effectively limiting the transmission rate of the pulses or the maximum distance of the concatenated fiber medium. Polarization mode dispersion (PMD) can be a major limitation for high data rate optical communications systems and is thus an important fiber attribute that fiber manufacturers monitor closely. One notorious aspect of fiber...

Claims

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