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采用光学相位共轭补偿光纤通信系统的色散及非线性必须满足一个前提条件,即相位共轭器两边线路上的色散和非线性分布(或传输功率分布)必须严格对称,这在现有的一般传输线路(标准单模光纤加集总掺铒光纤放大器)难以实现。提出了预啁啾结合中距相位共轭的补偿方案,并进行了数值计算。结果表明,通过在发送端对输入脉冲进行预啁啾展宽,可有效地减轻非线性效应与色散的相互作用,获得理想的补偿效果;对于皮秒超短光脉冲传输,脉冲内拉曼散射相对于三阶色散对补偿结果的影响很小,因此,频域相位共轭相对于时域相位共轭具有更好的综合补偿性能。该方案简单易行,无需对已敷设好的线路作较大改动。
Dispersion and nonlinearity using optical phase conjugation compensation for optical fiber communication systems must satisfy the precondition that the dispersion and the non-linear distribution (or transmission power distribution) of the lines on both sides of the phase conjugator must be strictly symmetric, Transmission lines (standard single-mode fiber plus total erbium-doped fiber amplifier) is difficult to achieve. The compensation scheme of pre-chirp and mid-phase conjugation is proposed and the numerical calculation is carried out. The results show that the pre-chirp broadening of the input pulse at the transmitting end can effectively reduce the interaction between the nonlinear effect and the dispersion, and obtain the ideal compensation effect. For the picosecond ultrashort optical pulse transmission, the intra-pulse Raman scattering The third-order dispersion has little effect on the compensation results, so the phase conjugation in the frequency domain has a better overall compensation performance than the phase conjugation in the time domain. The scheme is simple and easy, without any major changes to the laid-up lines.