Topic
Polarization mode dispersion
About: Polarization mode dispersion is a research topic. Over the lifetime, 5147 publications have been published within this topic receiving 80055 citations. The topic is also known as: PMD.
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Patent•
11 Mar 2002
TL;DR: In this paper, a method and apparatus for managing state-of-polarization (SOP) controllers along an optical communications link is presented, where when the polarization-mode dispersion (PMD) in the link exceeds a preset limit as determined by a PMD compensator, the SOP controller is directed to change rotation angle in an arbitrary fashion.
Abstract: A method and apparatus for managing state-of-polarization (SOP) controllers along an optical communications link. When the polarization-mode dispersion (PMD) in the link exceeds a preset limit as determined by a PMD compensator, the SOP controller is directed to change rotation angle in an arbitrary fashion. This shift is only undertaken after other indicators are examined to determine that PMD is the main problem affecting the link, and not simply a consequence of a separate problem that the SOP controller rotation angle should not try to fix. By reducing unnecessary SOP adjustments which can disrupt data traffic, the reliability of the optical link is improved.
25 citations
TL;DR: In this paper, the state of polarization time drift in different fibers was explored and different aerial fiber polarization effects were investigated and discussed, and fiber galloping and aerial fiber system impact issues were discussed.
25 citations
TL;DR: In this article, a demultiplexing scheme based on four wave mixing (FWM) in a polarization-maintaining fiber loop (PMFL) with bidirectional operation is presented.
Abstract: Polarization-insensitive 640 Gbit/s demultiplexing for OTDM data signals is demonstrated using a 100 m polarization-maintaining highly non-linear fibre. The scheme is based on four wave mixing (FWM) in a polarization-maintaining fibre loop (PMFL) with bidirectional operation. Less than 0.2 dB polarization dependence is obtained. The FWM efficiency is about -6 dB if the passive loss of the PMFL is not included. The flatness characteristic of the FWM efficiencies allows for the OTDM demultiplexing of a high speed signal with a bandwidth of 1.2 THz. Error free performance with low penalty for the demultiplexed 10 Gbit/s signal is achieved for the polarization scrambled 640 Gbit/s data signal. BER measurements and eye-diagrams show that the demultiplexed 10 Gbit/s signals with and without polarization scrambling have almost identical performance.
25 citations
TL;DR: In this article, the root-mean-square (rms) differential group delay (DGD) is derived independently of previous assumptions regarding the coupling regime, the shape of the interferograms, or the width and smoothness of the source spectrum.
Abstract: We present the theoretical framework that provides for a generalization of the standard interferometric method of polarization-mode dispersion (PMD) measurement. The basic formula linking the root-mean-square (rms) differential group delay (DGD) to the interferograms is derived independently of previous assumptions regarding the coupling regime, the shape of the interferograms, or the width and smoothness of the source spectrum. Moreover, the measured rms-DGD value is shown to be a well-defined weighted average over a finite wavelength range that can be rigorously traced to DGD measurements. Numerical simulations confirm the mathematical exactness of the analysis, and experimental tests confirm the extended range of validity provided in practice by the generalized method.
25 citations
TL;DR: A novel approach to combating the pulse broadening effects of group- velocity dispersion in a fiber-optic communication link due to higher-order dispersion terms has been presented.
25 citations