Lossless polarization attraction of copropagating beams in telecom fibers

Year: 2013

Authors: Kozlov V.V., Barozzi M., Vannucci A., Wabnitz S.

Autors Affiliation: Department of Physics, St. Petersburg State University, Petrodvoretz, St.-Petersburg 198504, Russian Federation; Dipartimento di Ingegneria dell\’Informazione, Università Degli Studi di Parma, Viale delle Scienze 181/A, Parma 43124, Italy; Department of Information Engineering, Università di Brescia, Via Branze 38, Brescia 25123, Italy

Abstract: We study the performance of a nonlinear lossless polarizer (NLP), the device that transforms an input arbitrary state of polarization (SOP) of a signal beam into one and the same SOP toward the output and, unlike conventional passive polarizers, performs this transformation without polarization-dependent losses. The operation principle of this device is based on the nonlinear rotation of the SOP of the strong signal beam under the interaction with a copropagating strong pump beam in a Kerr medium, which in our case is a telecom fiber. We quantify the performance of this NLP by introducing the notion of instantaneous degree of polarization, which is a natural extension of the conventional notion of the degree of polarization appropriate for CW beams to the case of pulses whose SOP is not constant across the pulse. We pay particular attention to the regime when signal and pump beams experience a walk-off in the dispersive medium. In particular, we demonstrate that a signal pulse experiences much stronger repolarization when the walk-off effect is present as compared with the case of no walk-off. We also study the degradation of the efficiency of the NLP in the presence of polarization mode dispersion.


Volume: 30 (3)      Pages from: 530  to: 540

More Information: This work was carried out with support from the Programma di Ricerca Scientifica di Rilevante Interesse Nazionale 2008 project \”Nonlinear cross-polarization interactions in photonic devices and systems.\”
KeyWords: Mathematical transformations; Natural language processing systems; Optical instruments, Arbitrary state; Degree of polarization; Dispersive medium; Natural extension; Nonlinear rotation; Polarization dependent loss; Strong pump beams; Walk-off effect, Polarization
DOI: 10.1364/JOSAB.30.000530

Citations: 14
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