From OFS Specialty Photonics Division
With a growing number of systems running at 10 Gbit/s and large interest in 40 Gbit/s systems, there is increased focus on Polarization Mode Dispersion (PMD). Even though EDF amplifiers only consist of tens of meters of EDF, the PMD tolerance on the fiber is tight. But measuring the correct PMD in an EDF is not trivial [1]. Characterizing the intrinsic birefringence originating from geometric deformities in the fiber will not necessarily reveal the performance of the fiber in a coiled configuration, due to the interference between the externally induced birefringence from bending and the intrinsic birefringence, mitigated from spinning the fiber during draw [2], [3]. In this paper we demonstrate that coiling a fiber to diameters less than 10 cm can lead to significant bending induced PMD. Furthermore, we show that coiling high PMD spun fiber leads to highly unpredictable results
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2.13.7 Polarization-Mode Dispersion Compensation Fibers are specified by an average differential group delay (DGD) in ps or a mean DGD coefficient in . For a low-PMD fiber, the mean DGD...
7.1 Apologia Thus far in this book, we have tended to gloss over polarization and effects of the fiber's birefringence on it. That is, for the most part, we have been content to note the thorough...
2.8 POLARIZATION MODE DISPERSION 2.8.1 Overview In the early 1990s, the deleterious effects of PMD were first reported in transmission of analog signals over Hybrid Fiber Coax (HFC) networks...
2.13.6 Polarization-Mode Dispersion All fibers have some residual birefringence and a core that is not perfectly circular over their entire length. Fiber birefringence and core noncircularity...
9.6.3 PMD and Polarization-Dependent Losses As discussed in Section 3.4, fluctuations in the residual birefringence of optical fibers change the state of polarization (SOP) of all channels in a random...
