Jun Chang Su, Im Ju Hee, Yoo Sang Hwa, Choi Sun Young, Rotermund Fabian, Yeom Dong-Il, Kim Byoung Yoon
Department of Physics, KAIST, Daejeon, 305-701, Korea.
Opt Express. 2011 Sep 26;19(20):19775-80. doi: 10.1364/OE.19.019775.
Passive harmonic mode-locking in soliton fiber laser is presented with excellent noise characteristics by employing a single-walled carbon nanotubes saturable absorber designed to interact with evanescent wave of the laser field. The 34(th) harmonic mode-locking pulses at 943.16 MHz repetition rate were stably generated with 18 mW output power, >50 dB side-mode suppression and -140 dB/Hz relative intensity noise. Soliton energy control with polarization controller further increased the harmonic order to 61st, 1.692 GHz, but with compromised performance. Scaling to higher-order harmonic mode-locking is discussed for practical application in optical communication system.
通过采用一种设计用于与激光场的倏逝波相互作用的单壁碳纳米管饱和吸收体，实现了孤子光纤激光器中的被动谐波锁模，具有出色的噪声特性。以943.16 MHz的重复频率稳定产生了第34次谐波锁模脉冲，输出功率为18 mW，边模抑制比>50 dB，相对强度噪声为-140 dB/Hz。使用偏振控制器进行孤子能量控制可将谐波阶数进一步提高到第61次，即1.692 GHz，但性能有所下降。讨论了在光通信系统实际应用中扩展到高阶谐波锁模的问题。
