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Optical Engineering

Vector solitons with polarization instability and locked polarization in a fiber laser
Author(s): Dingkang Tang; Jian-Guo Zhang; Yuanshan Liu
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Paper Abstract

We investigate the characteristics of vector solitons with and without locked phase velocities of orthogonal polarization components in a specially-designed laser cavity which is formed by a bidirectional fiber loop together with a semiconductor saturable absorber mirror. The characteristics of the two states are compared in the temporal and spectrum domain, respectively. Both of the two states exhibit the characteristic of mode locking while the two orthogonal polarization components are not resolved. However, for the vector soliton with unlocked phase velocities, identical intensity varies after passing through a polarization beam splitter (PBS) outside the laser cavity. Contrary to the polarization rotation locked vector soliton, the intensity does not change periodically. For the polarization-locked vector soliton (PLVS), the identical pulse intensity is still obtained after passing through the PBS and can be observed on the oscilloscope screen after photodetection. A coupler instead of a circulator is integrated in the laser cavity and strong interaction on the polarization resolved spectra of the PLVS is observed. By comparing the two states, we conclude that interaction between the two orthogonal components contributes to the locked phase velocities.

Paper Details

Date Published: 6 July 2012
PDF: 5 pages
Opt. Eng. 51(7) 074202 doi: 10.1117/1.OE.51.7.074202
Published in: Optical Engineering Volume 51, Issue 7
Show Author Affiliations
Dingkang Tang, Xi'an Institute of Optics and Precision Mechanics (China)
Jian-Guo Zhang, London South Bank Univ. (United Kingdom)
Yuanshan Liu, Xi'an Institute of Optics and Precision Mechanics (China)

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