摘要
用常规掺铒光纤放大器放大超短光孤子存在一个重大困难 ,就是在放大过程中光纤非线性效应会引起孤子波形及频谱畸变 ,使得输出脉冲不再具有孤子特性 ,从而影响系统性能。提出一种利用掺铒光纤环镜放大超短光孤子的新方法 ,数值计算表明 ,该方法不仅可实现无畸变的光孤子放大 ,而且能同时实现孤子宽度的有效压缩。当宽度为 2 ps的基阶孤子经过长度为 92 .6m、增益为 14 .4dB的环镜后 ,其峰值功率被放大 16 5倍 ,脉冲宽度被压缩到 0 .19ps ,时间带宽积为 0 .30 3,脉座能量仅占整个脉冲能量的 3.8% ,表明由环镜输出的放大脉冲很大程度上具有基阶孤子特性。
A technique for simultaneous amplification and compression of ultrashort fundamental solitons is proposed. It is based on an erbium-doped nonlinear amplifying fiber loop mirror. Numerical simulations show that, unlike conventional erbium-doped fiber amplifiers in which nonlinear effects lead to serious distortion of amplified pulses, the proposed device performs not only distortion-free amplification but also efficient compression of ultrashort solitons. Using a 92.6 m erbium-doped fiber loop with a gain of 14.4 dB, the peak intensity of a 2 ps fundamental soliton is amplified by a factor of 165 with a compression factor of 10.48 and a time-bandwidth product of 0.303. The pedestal energy accounts for only 3.8% of the total energy of the amplified pulse which means that the pulse is very close to a fundamental soliton.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2004年第8期1067-1072,共6页
Acta Optica Sinica
基金
国家自然科学基金 (6 0 2 770 16 )
广东省自然科学基金(0 2 135 7)
广东省"千百十工程"优秀人才培养基金资助课题
关键词
非线性光学
掺铒光纤放大器
光孤子
超短光脉冲放大
脉冲压缩
nonlinear optics
erbium-doped fiber amplifiers
optical solitons
ultrashort pulse amplification
pulse compression
