Abstract
We propose a special asymmetric sampling structure based on reconstruction-equivalent-chirp technology to effectively suppress the side mode oscillation in the zeroth channel in a sampled Bragg grating semiconductor laser, which improves greatly the single-longitudinal mode (SLM) oscillation capability of the laser. A numerical simulation is performed. The proposed structure guarantees a normalized threshold gain margin between the main mode and the side mode larger than 0.3. A high side-mode suppression ratio is also observed. The proposed method would be of great importance for the fabrication of high-performance and wideband multiwavelength laser arrays with each laser operating in SLM.
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