光交换节点中的全光再生技术研究

比较了光交换节点中几种全光再生技术方案的优缺点，重点描述光纤参量振荡器的时钟提取实验和基于磁光四波混频的光门整形技术。实验揭示了光纤参量振荡器闲频光反馈控制方法的工作原理，并提取出稳定的高质量时钟信号。仿真比较了4种四波混频光门再生方案的功率转移特性，开展了磁光四波混频再生实验。研究表明:通过对高非线性光纤加载180 Gs直流磁场，可使光接收机灵敏度进一步提升2 dB。最后指出了全光再生技术的多信道、集成化发展趋势。

All-optical regeneration technologies in optical switching nodes

Several schemes on all-optical signal regeneration in optical switching nodes are compared. The clock extraction experiments using fiber optical parametric oscillator (FOPO) and magneto-optical four-wave mixing (MO-FWM) 2R regeneration are analyzed. The principle of the idler-power-based feedback control technique to effectively enhance the stability of the FOPO for clock extraction is illustrated in terms of the experimental data. The power transfer characteristics of four FWM-based regeneration schemes are simulated and the MO-FWM-based regeneration experiment is implemented by using clock pump and idler filtering. It is shown that, the receiver sensitivity is further improved by 2 dB when the direct current (DC) magnetic field of 180 Gs is applied along the high nonlinear fiber. It is also pointed out that all-optical regeneration technologies trend to the evolution of multi-channel and integration from a long-term point of view.