Polarization modes dispersion (PMD) is one of the major factors that impose restrictions in the speed of optical
communication links and some efforts must be done in order to properly quantify this effect. In this way we develop
studies on the behavior of such a phenomenon, critical when light is transmitted through long optical fibers. The focus in
this paper is to discuss the different behavior of PMD over different wavelengths ranges. Results indicate that PMD
value varies, depending on the spectral region covered by the optical source. Measurements were performed using the
interferometric method on three different types of optical fiber with three broadband optical sources covering the infrared
spectral bands O, S, C and L. The evaluation of mean PMD is also discussed in the metrology concepts.
It is shown the feasibility of direct fitting of external quantum efficiency for silicon trap detectors which are applied as
radiometric transfer standards at several National Institutes of Metrology. The model considers the internal quantum
efficiency and the reflectance of the detector, whose parameters are fitted in the measured data of external quantum
efficiency. The advantage of the suggested approach is the possibility of pursuing interpolation of spectral responsivity
without loss of physical meaning of the fitted parameters.
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