Optical Generation Processes

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Nonlinear Optics ‐ Novel Results in Theory and Applications

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Chapter 5

and Evgeny Kuzin

Abstract

1. Introduction

73

Polarization Properties of the

Pumped by ns Pulses

fiber without twist, the soliton polarization was random.

birefringence and polarization, stimulated Raman scattering

Solitons Generated in the Process

of Pulse Breakup in Twisted Fiber

Ariel Flores Rosas, Orlando Díaz Hernández, Roberto Arceo,

Common optical fibers are randomly birefringent, and solitons formatting and traveling in them are randomly polarized. However, it is desirable to have solitons with a well-defined polarization. With pump relatively long pulses, the nonlinear effects of modulation instability (MI) and stimulated Raman scattering (SRS) are dominant at the initial stage of the process of supercontinuum (SC) generation; modulation instability results in pulse breakup and formation of short pulses that evolve finally to a bunch of solitons and dispersive waves. We do the research of the polarization of solitons formed by the pulse breakup process by the effect of modulation instability with pump pulses of nanoseconds in standard fiber (SMF-28) with circular birefringence introduced by fiber twist, and the twisted fiber mitigates the random linear birefringence. In this work, we found that polarization ellipticity of solitons is distributed randomly; nevertheless, the average polarization ellipticity is closer to the circular than the polarization ellipticity of the input pulse. In the experimental setup. 200 m of SMF-28 fiber twisted by 6 turns/m was used. We used 1 ns pulse to pump the fiber. The results showed that at circular polarization of the input pulse solitons at the fiber output have polarizations close to the circular, while in the

Keywords: fiber optic, nonlinear optics, pulse propagation and temporal solitons,

One of the important mechanisms for the generation of supercontinuum (SC) is

the formation of solitons by the nonlinear effect of modulation instability. One feature of the common optical fibers is that they are randomly birefringent, and therefore the generation of solitons and the transition of them by these fibers generated by the nonlinear effects are randomly polarized. Solitons with a well-defined

Gerardo J. Escalera Santos, Sergio Mendoza Vázquez, Elizeth Ramírez Álvarez, Christian I. Enriquez Flores
