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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 major difficulty in amplifying ultrashort optical solitons with conventional erbium-doped fiber amplifiers is that nonlinear effects of the optical fiber can cause soliton waveforms and spectral distortions during amplification so that the output pulses no longer have soliton characteristics and thus affect system performance. A new method for amplifying ultrashort optical solitons using erbium-doped fiber ring mirror is proposed. The numerical results show that this method not only can enlarge the optical soliton without distortion, but also can effectively compress the soliton width. When the fundamental order soliton with a width of 2 ps passes through a ring mirror with a length of 92.6m and a gain of 14.4dB, its peak power is amplified by 16 5 times. The pulse width is compressed to 0.19ps and the time bandwidth product is zero. The pulse energy of only 3.8% of the total impulse energy indicates that the amplified pulse output by the toroidal mirror possesses a large degree of first order soliton characteristics.