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Method and apparatus for PMD mitigation in optical communication systems

An optical communication system and channel technology, applied in transmission systems, electromagnetic wave transmission systems, electrical components, etc., can solve problems such as performance degradation of multiple optical communication links

Inactive Publication Date: 2008-02-27
LUCENT TECH INC
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  • Claims
  • Application Information

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Problems solved by technology

[0013] According to the nodal model, multiple optical communication links will periodically experience severe performance degradation if all or most of the WDM channels fall within the link's non-compliant capabilities

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  • Method and apparatus for PMD mitigation in optical communication systems
  • Method and apparatus for PMD mitigation in optical communication systems
  • Method and apparatus for PMD mitigation in optical communication systems

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Embodiment Construction

[0018] 3A to 3C illustrate an exemplary method of assigning WDM channels in a link for mitigating the effects of PMD. The entire range of frequency wavelengths supported by the link 310 includes a number of WDM channels 320 . According to the invention, when assigning traffic to WDM channels, WDM channel 320.1 belonging to the first group of channels is deployed first, indicated by solid shading in Figure 3B. The first set of channels 320.1 is chosen so as to be separated by frequency (or wavelength) spacing 350. The optimal choice of spectral spacing 350 is such that the WDM channels 320.1 are statistically uncorrelated with each other.

[0019] When the spectral spacing of each WDM channel exceeds the PMD correlation bandwidth of the link, each WDM channel is statistically uncorrelated. Related to the definition of the relevant bandwidth, the PMD relevant bandwidth is approximately in the polarization main state bandwidth (B PSP ) between 2 and 6 times. Thus, in the exem...

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Abstract

An optical communication system is provided comprising a transmission link including one or more quasi-static waveguide sections coupled by one or more non-static coupling sections. A transmitter is coupled to the transmission link and is adapted to transmit optical signals through the transmission link with wavelength channel spacing of the optical signals greater than about the PMD correlation bandwidth of at least one of the one or more quasi-static waveguide sections, such that the PMD induced outage probability for the system is optimized.

Description

[0001] Cross Reference Related Applications [0002] This application is based upon and claims priority to U.S. Patent Application Nos. 11 / 073,061 and 11 / 307,918, the former filed on March 4, 2005, and the latter filed on February 28, 2006, here These two patent applications are cited in their entirety for reference. technical field [0003] The invention relates to the field of high-speed optical communication, in particular to a method and equipment for alleviating polarization mode dispersion (PMD) in an optical communication system. Background technique [0004] Deviating from the nominal circular symmetry of the fiber leads to birefringence, which results in different group velocities for the orthogonal polarization modes. The two polarization components of the optical signal thus experience some differential group delay (DGD), which may also vary with wavelength. Because optical receivers typically detect the total optical power, regardless of polarization, DGD acts...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/18
CPCH04B10/2569
Inventor 罗伯特·M.·乔普森赫维格·W.·科格尔尼克彼得·J.·温泽尔
Owner LUCENT TECH INC