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Broadband polarization pulling using Raman amplification
Muga, Nelson J.; Ferreira, Mario F. S.; Pinto, Armando N.The Raman gain based polarization pulling process in a copropagating scheme is investigated. We map the degree of polarization, the angle between the signal and pump output Stokes vectors, the mean signal gain and its standard deviation considering the entire Raman gain bandwidth. We show that, in the undepleted regime (signal input power similar to 1 mu W), the degree of polarization is proportional to the pum...
Polarization scattering property of cascaded polarization controllers
Muga, Nelson J.; Ferreira, Mário F.; Pinto, Armando NolascoThe relation between the allowed range of variation of polarization controller wave-plates angles and the respective polarization scattering properties is investigated It is demonstrated that a nearly uniform polarization scattering over the Poincare sphere is obtained using a concatenation of three polarization controllers with angles randomly changed between -pi/4 and pi/4. It is also shown that an improvemen...
Uniform polarization scattering with fiber-coil-based polarization controllers
Muga, Nelson J.; Pinto, Armando Nolasco; Ferreira, Mário F. S.; Ferreira da Rocha, José R.A detailed study of fiber-coil-based polarization controllers (PCs) is performed. First, a method to deterministically calculate the PC configuration in order to transform between any two states of polarization is presented. In a second stage, the case in which the configuration angles are randomly changed is studied. The cases of a single PC and of the system obtained with the concatenation of several PCs are ...
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