Mode optimization in a 1550  nm VCSEL based on mesa-dielectric film synergistic regulation

This study presents an optimized method for achieving high-order mode suppression and single-mode stabilization in InP-based VCSELs through synergistic control of mesa and dielectric film structures. By adjusting the mesa width and dielectric film width-two critical parameters significantly affecting mode characteristics-transverse modes can be effectively regulated. Simulation results demonstrate that these structures synergistically control optical field profiles, enhancing mode stability without compromising output efficiency. The parameters precisely regulate transverse mode quantity, volume, and stability, while a newly defined parameter, to our knowledge, the effective modal gain, improves mode identification. These optimization strategies provide an effective solution for advanced mode control in InP-VCSEL systems, offering significant improvements in laser performance.