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Modelling of polarization mode dispersion in optical communications systems

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Journal of Optical and Fiber Communications Reports

Abstract

With the rapid increase in the data rates transmitted over optical systems, as well as with the recent extension of terrestrial systems to ultra-long haul reach, polarization mode dispersion (PMD) has become one of the most important and interesting limitations to system performance. This phenomenon originates from mechanical and geometrical distortions that break the cylindrical symmetry of optical fibers and create birefringence. It is the random variations of the local birefringence along the propagation axis of the optical fiber that create the rich and complicated bulk of phenomena that is attributed to PMD. The detailed statistical properties of the local birefringence and its dependence on position are only important as long as the overall system length is comparable with the correlation length of the birefringence in the fiber. In typical systems, however, the latter is smaller by more than three orders of magnitude so that the specific properties of the local birefringence become irrelevant. Instead, the fiber can be viewed as a concatenation of a large number of statistically independent birefringent sections characterized only by the mean square value of their birefringence. This model has been used extensively in the study of PMD and its predictions have been demonstrated to be in excellent agreement with experimental results. This approach opens the door to the world of stochastic calculus, which offers many convenient tools for studying the PMD problem. In this article we review the modelling of PMD and discuss the properties of this phenomenon as a stochastic process. We explain the use of stochastic calculus for the analysis of PMD and describe the derivation of the frequency autocorrelation functions of the PMD vector, its modulus and the principal states. Those quantities are then related to commonly used parameters such as the bandwidth of the first order PMD approximation, the bandwidth of the principal states and to the accuracy of PMD measurements.

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Authors and Affiliations

  1. School of Electrical Engineering, Dept. of Physical Electron., Tel-Aviv University, Tel-Aviv, Israel

    Mark Shtaif

  2. Department of Electrical Engineering, University of L’Aquila, L’Aquila and Istituto Nazionale di Fisica della Materia, Italy

    Antonio Mecozzi

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  1. Mark Shtaif
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  2. Antonio Mecozzi
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Correspondence to Mark Shtaif or Antonio Mecozzi.

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Shtaif, M., Mecozzi, A. Modelling of polarization mode dispersion in optical communications systems. J Optic Comm Rep 1, 248–265 (2004). https://doi.org/10.1007/s10297-004-0002-4

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