Affiliation:
1. Northwestern Polytechnical University Xi’an
Abstract
We demonstrate a unique pulse-splitting mechanism dominated by the linear coupling between two vector modes in a mode-locked fiber laser using polarization-maintaining fiber. As the linear coupling strength increases, the pulse experiences larger perturbations and manifests as stronger spectral sidebands. Correspondingly, the temporal pedestals possessing a higher intensity become untrapped and eventually evolve into a stable pulse. Such linear coupling-related pulse splitting is ubiquitous both in normal- and anomalous-dispersion regimes, fundamentally differing from that induced by the excessive nonlinear phase shift. Experimental observations fully sustain numerical results and provide a flexible approach to managing the number and energy of vector solitons.
Funder
National Natural Science Foundation of China
Natural Science Basic Research Program of Shaanxi Province
Fundamental Research Funds for the Central Universities
Subject
Atomic and Molecular Physics, and Optics