Compact Brillouin comb laser in Chalcogenide fiber assisted by four-wave mixing

Abstract

We experimentally demonstrate a multiwavelength Brillouin comb generation employing a segment of As2S3 chalcogenide fiber as the Brillouin gain medium. The extremely high nonlinear and Brillouin gain coefficients allow the As2S3 fiber length to be as short as 4.2 m. A compact Brillouin comb laser composed of multiple Brillouin Stokes and anti-Stokes channels is generated from the As2S3 fiber either with or without ring cavity feedback through the interaction of stimulated Brillouin scattering and four-wave mixing effects. Different output couplings are used to extract the Brillouin comb laser when the cavity feedback is connected. A high laser power of 927 mW and multiple laser channels of 20 are achieved with an output coupling of 90 % and 10 %, respectively. A trade-off between the power threshold, laser channel number, output power and slope efficiency should be considered when optimizing the optical performance of the multiwavelength Brillouin laser.