Lin Gong-Ru, Wu Ming-Chung, Chang Yung-Cheng, Pan Ci-Ling
Opt Express. 2005 Sep 5;13(18):7215-24. doi: 10.1364/opex.13.007215.
The supermode noise suppressing ratio (SMSR) and the phase noise of a harmonically mode-locked Erbium-doped fiber laser (HML-EDFL) with an intra-cavity semiconductor optical amplifier (SOA) and an optical band-pass filter (OBPF) are improved and compared with a state-of-the-art Fabry-Perot laser diode (FPLD) injection-mode-locked EDFL. By driving the intra-cavity SOA based high-pass filter at unitary gain condition, the SMSR of the HML-EDFL is enhanced to 82 dB at the cost of degrading phase noise, increasing jitter, and broadened pulse width. The adding of OBPF further improves the SMSR, pulse width, phase noise, and jitter of the SOA-filtered HML-EDFL to 90 dB, 42 ps, -112 dBc/Hz, and 0.7 ps, respectively. The ultrahigh SMSR of the SOA-filtered HML-EDFL can compete with that of the FPLD injection-mode-locked EDFL without sacrificing its pulse width and jitter performances.
通过在腔内半导体光放大器（SOA）和光学带通滤波器（OBPF）的情况下，改善了具有腔内半导体光放大器和谐波锁模掺铒光纤激光器（HML-EDFL）的超模噪声抑制比（SMSR）和相位噪声，并与最先进的法布里-珀罗激光二极管（FPLD）注入锁模EDFL进行了比较。通过在单位增益条件下驱动基于腔内SOA的高通滤波器，HML-EDFL的SMSR提高到82 dB，但代价是相位噪声恶化、抖动增加和脉冲宽度变宽。添加OBPF进一步将经SOA滤波的HML-EDFL的SMSR、脉冲宽度、相位噪声和抖动分别提高到90 dB、42 ps、-112 dBc/Hz和0.7 ps。经SOA滤波的HML-EDFL的超高SMSR可以与FPLD注入锁模EDFL相媲美，而不会牺牲其脉冲宽度和抖动性能。
