Abstract

Phase-locked, multiwavelength laser sources with gigahertz line spacing are important for a variety of applications including arbitrary optical waveform generation and advanced telecommunications. Recently, it was demonstrated that the interplay of cascaded stimulated Brillouin scattering (SBS) and Kerr-nonlinear four-wave mixing (FWM) in Fabry-Perot resonators can generate phase-locked, equally spaced frequency components, i.e. frequency combs [1, 2]. Instead of Fabry-Perot resonances, Bragg grating resonances offer a flexible and tunable in-fiber approach that can also lower the threshold power SBS. This has recently been used to demonstrate a distributed feedback (DFB) Brillouin laser [3] based on a uniform Bragg grating with a π- phase shift manifesting in a single resonance.

© 2015 IEEE