1,721,267 research outputs found
APPARATUS FOR MEASURING CHARACTERISTICS OF AN OPTICAL FIBRE
No full textThe present invention aims to provide apparatus to measure the beat length, the correlation length, the polarization mode dispersion and other characteristics of single mode optical fibers related to the two polarization modes of the fiber at different positions along the length of the fiber. The present invention also aims to provide apparatus for the measurement of characteristics of an optical fiber with access to only one end of the fiber
Reflectometric measurements of PMD properties in long single-mode fibers
No full textPolarization sensitive reflectometric measurements are effective tools for the characterization of polarization properties of optical-fiber link. The field of application of these techniques depends on whether they use a continuous wave source or a pulsed source to generate the probe signal. In the first case, reflectometric techniques may be successfully applied to perform single-end measurement of differential group delay and polarization dependent loss. In the second case - that is the case of polarization sensitive optical time domain reflectometry - the local birefringence of a single mode fiber can be measured and characterized. In this paper the theory and the applications of polarization sensitive reflectometric techniques are reviewed
Measure of twist-induced circular birefringence in long single-mode fibers: Theory and experiments
No full textProduction defects and external perturbations cause standard telecommunication fibers to be randomly birefringent. Fiber birefringence is the origin of the well-known polarization mode dispersion (PMD), which degrades system performances. The knowledge of birefringence properties may be crucial, especially when problems like development of low-PMD fibers or PMD interaction with optical nonlinearities in very high-capacity systems are faced. Some techniques are known to measure birefringence, and useful results have been obtained for both installed and wound-on-drum fibers. However, measurement of the circular component of birefringence still presents difficulties. In this paper, a new method for circular birefringence measurement is proposed that applies to long single-mode twisted fibers. The technique is based on polarization-sensitive optical time-domain reflectometry. Experimental results are in good agreement with the theoretical analysis
Relationship between pulse broadening due to polarisation mode dispersion and differential group delay in long singlemode fibres
No full textThe authors present a theoretical analysis of pulse broadening due to polarisation mode dispersion in long singlemode fibres. The results show that although differential group delay and pulse broadening have different probability density functions, a simple relationship holds for average values
COMPLETE CHARACTERIZATION OF POLARIZATION MODE DISPERSION IN ERBIUM DOPED OPTICAL AMPLIFIERS
No full textPOTDR techniques for measurement of fiber birefringence properties
No full textPolarization-sensitive optical time domain reflectometry techniques which are used for measurement of fiber birefringence properties are discussed. The techniques are based on the fact that evolution of backscattered field polarization is affected by fiber birefringence. The autocorrelation function of the components of the round-trip birefringence was estimated. It is found that the techniques may be useful for inspection and testing of fiber production processes, from drawing to cabling
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