Numerical Study of A Mode-locked Fiber Ring Laser Consisting of Two SOAs
包含两个半导体光放大器的锁模光纤环形激光器数值研究

Based on the self-reproduction theory, a mode-locked fiber ring laser consisting of two semiconductor optical amplifiers (SOAs) was numerically investigated. The result shows that the quality of harmonic mode-locked pulse can be enhanced when the modulation SOA is dc biased on the high current modulates the spontaneous emission in the SOA and provides the gain, whereas the gain SOA is dc biased on the low current functions as gain compensator for obtaining a narrow net gain window. However, to realize pulse-amplitude equalization of rational harmonic mode locking, the condition that the modulation SOA is dc biased on the low current whereas the gain SOA is dc biased on the high current must be satisfied, besides, an erbium-doped fiber amplifier (EDFA) should be added to the experiment setup to enhance the optical-injection power output from the gain switch DFBLD.