Period doubling eigenstates in a fiber laser mode-locked by nonlinear polarization rotation

TL;DR

This paper investigates period doubling eigenstates in fiber laser solitons, revealing complex polarization dynamics and asynchronous behaviors influenced by cavity conditions, through detailed numerical analysis.

Contribution

It introduces the concept of period doubling eigenstates in fiber laser solitons and explores their complex polarization dynamics under various conditions.

Findings

Existence of asynchronous polarization component evolution.

Simultaneous period doubling and period one states in polarization components.

Complex dynamics observed during period tripling windows.

Abstract

Due to the weak birefringence of single mode fibers, solitons generated in fiber lasers are indeed vector pulses and exhibit periodic parameter change including polarization evolution even when there is a polarizer inside the cavity. Period doubling eigenstates of solitons generated in a fiber laser mode-locked by the nonlinear polarization rotation, i.e., period doubling of polarization components of the soliton, are numerically explored in detail. We found that, apart from the synchronous evolution between the two polarization components, there exists asynchronous development depending on the detailed operation conditions. In addition, period doubling of one polarization component together with period-one of another polarization component can be achieved. When the period tripling window is obtained, much complexed dynamics on the two polarization components could be observed.