1,721,043 research outputs found
Optical fibre with reduced polarization mode dispersion and method for obtaining an optical fibre with reduced polarization mode dispersion
No full textOptimized spinning design for low PMD fibers: An analytical approach
No full textIt is known that the differential group delay (DGD) due to polarization mode dispersion (PMD) can be effectively reduced by spinning the fiber during drawing. In this paper, we propose an analytical approach that allows optimization of the spinning design. The fundamental idea is that, in the absence of polarization coupling, an optimized spinning profile can balance the effects of the intrinsic linear birefringence so that the differential group delay can be forced to be periodic and, consequently, have a limited amplitude as a function of distance. Our approach Is independent of the spin profile. In other words, with a fixed set of parameters that characterize a particular spin function, we are able to find analytically the values corresponding to a periodic DGD in a deterministic regime. Numerical results based on waveplate model confirm the analytical prediction and show that PMD can be reduced by about two orders of magnitude with respect to the same fiber without spinning, even after the introduction of random polarization couplin
Polarization mode dispersion properties of constantly spun randomly birefringent fibers
No full textWe calculate the asymptotic first-order polarization mode dispersion statistics of constantly spun fibers. We show that in the long length regime the mean differential group delay of constantly spun fibers grows linearly with distance at the same rate as for unspun fibers. Conversely, the short length regime of constantly spun fibers may be much longer, even for limited spin rates
Polarization mode dispersion management using unidirectionally spun fibers
No full textOptical fiber links made by concatenating unidirectionally spun fibers with alternate helicities are considered. The polarization mode dispersion of such links is thoroughly analyzed, and it is shown that with a proper design of the link, substantial differential group delay (DGD) reduction can be achieved. In particular, the highest performance is attained when a well-defined balance condition is satisfied. By relaxing this condition, a tradeoff between the complexity of the link structure and the DGD reduction can be achieved as wel
Calculation of the mean differential group delay of periodically spun, randomly birefringent fibers
No full textSpinning is one of the most effective and well-known ways to reduce polarization mode dispersion of optical fibers. In spite of the popularity of spinning, a detailed theory of spin effects is still lacking. We report an analytical expression for the mean differential group delay of a randomly birefringent spun fiber. The result holds for any periodic spin function with a period shorter than the fiber's beat length
Dispersione di polarizzazione in fibre ottiche a birifrangenza aleatoria sottoposte a torsione a caldo unidirezionale
No full text
Influence of the model of random birefringence on the PMD of periodically spun fibers
No full textWe show that the differential group delay of randomly birefringent periodically spun fibers, depends strongly on the model used for the birefringence. Overly simple models may overestimate the benefit of spin in reducing polarization mode dispersion
Theory and measurement of PMD in spun fiber
No full textIn this paper we focus under a theoretical point of view on spun fibers and in particular we analyze how periodic or constant spin profiles affect the PMD properties of a fiber. Moreover, we introduce a measurement technique based on polarization sensitive reflectometry that allows to control the quality of the spin process
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