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提出一种腔内损耗小的基于半导体光放大器(SOA)交叉增益调制效应(XGM)的主动锁模光纤激光器结构。使用光环行器成功减小了激光器的腔内损耗,提高了激光器的输出功率。从理论上对有理数谐波锁模过程中腔内脉冲复合的物理机制进行了详细分析。利用有理数谐波锁模技术,在调制频率为10 GHz下,得到了重复频率为30 GHz的皮秒级光脉冲序列输出,其峰值功率约0.5 mW。由于半导体光放大器的宽增益谱与滤波器的较大可调谐范围,使得激光器输出可以在较大的波长可调谐范围内保持较大功率输出。成功实现了调制频率为20 GHz的谐波锁模短光脉冲输出,可调谐范围达40 nm,峰值功率大于0.65 mW。半导体光放大器和激光器的短腔长保证了激光器的长期稳定性。
An active mode-locked fiber laser structure based on the cross-gain modulation effect (XGM) of semiconductor optical amplifier (SOA) with low cavity loss is proposed. The use of an optical circulator successfully reduces the cavity loss in the laser and increases the output power of the laser. The physical mechanism of pulse recombination in the cavity of rational number harmonic mode-locking is theoretically analyzed in detail. Using the rational Harmonic mode-locked technique, picosecond optical pulse sequence with repetition rate of 30 GHz is obtained at the modulation frequency of 10 GHz, and the peak power is about 0.5 mW. Due to the wide gain spectrum of the semiconductor optical amplifier and the large tunable range of the filter, the laser output can maintain a relatively large power output over a large wavelength tunable range. A harmonic mode-locked short pulse output with a modulation frequency of 20 GHz was successfully achieved with a tunable range of 40 nm and a peak power of greater than 0.65 mW. The short cavity length of the semiconductor optical amplifier and the laser ensures the long-term stability of the laser.