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System and method for multi-channel mitigation of PMD/PDL/PDG

An optical signal, FEC-BECL technology, applied in the field of optical communication

Inactive Publication Date: 2005-02-16
LUCENT TECH INC
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Problems solved by technology

However, there is actually no known method that provides the deep interleaving needed to avoid PMD stalls that may last several minutes or longer in practical systems

Method used

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  • System and method for multi-channel mitigation of PMD/PDL/PDG
  • System and method for multi-channel mitigation of PMD/PDL/PDG
  • System and method for multi-channel mitigation of PMD/PDL/PDG

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Embodiment Construction

[0022] One aspect of the invention proposes to use FEC in combination with fast polarization scrambling to change the polarization of the signal between at least two states during each FEC Burst Error Correction Interval (BECP). By changing the link PMD at least once during each BECP, PMD-induced "stalls" are effectively limited to last for a time interval shorter than the correction time interval, so FEC can effectively correct errors of advantage that occur during the stall, given by Doing so for all wavelength channels simultaneously improves system tolerance to PMD, and prevents system stalls.

[0023] Figure 1A -D shows how the invention works. Figure 1A -B shows the situation without D-FPS. Such as Figure 1A - As shown in -B, PMD occasionally causes severe signal waveform distortion, which leads to continuous or very frequent errors. Such PMD-induced distortion can last from milliseconds to minutes.

[0024] For any given FEC code, there is a maximum number of corre...

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Abstract

System and method for multi-channel PMD / PDL / PDG mitigation, the system includes a polarization scrambler adapted to change the polarity of an optical signal propagating through the system during each burst error correction period of the forward error correction used by the system Polarization state in order to effectively change the polarization mode dispersion experienced by the signal.

Description

[0001] Cross References to Related Patent Applications [0002] This is a continuation-in-part of US Patent Application entitled "System And Method For Multi-channel Mitigation of PMD / PDL / PDG), filed July 31, 2003, which is hereby incorporated by reference. technical field [0003] The present invention relates to optical communications, and more particularly, to methods for mitigating degradation due to polarization mode dispersion (PMD), polarization-dependent loss (PDL), and polarization-dependent gain (PDG) in optical communication systems systems and methods. Background technique [0004] Polarization mode dispersion (PMD) is a common phenomenon that occurs when light waves travel through optical media, such as optical fibers and optical amplifiers. PMD occurs in optical fibers as a result of small birefringence caused by deviations of the fiber core from a perfect cylindrical shape, asymmetric stress or strain, and / or random external forces acting on the fiber. PMD r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/02G02B6/27H04B10/18H04J14/00H04J14/02
CPCH04B10/2569H04B2210/256
Inventor 文海顿刘翔谢崇进
Owner LUCENT TECH INC
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