基于光子晶体光纤的相位再生器的设计及优化

采用光子晶体光纤构成一个Sagnac环，在锁相本地振荡抽运源的驱动下，形成一个相位再生器，实现对差分相移键控调制信号的相位和幅度再生.理论推导了入射光信号经过相位再生器后的光场分布，讨论了不同入射信号光功率下，抽运光与信号光的相位差以及光子晶体光纤长度对信号功率增益的影响，给出了相位再生器的最优参数，数值模拟了信号再生前后的相位分布、强度分布及误码率，取得了很好的再生效果. 关键词： 光通信 相位再生 光子晶体 差分相移键控信号

Design and optimization of phase regenerator with photonic crystal fiber

Amplification and simultaneous phase regeneration of differential phase-shift keying （DPSK） signals is demonstrated using a phase regenerator. Phase regeneration is achieved in a Sagnac fiber interferometer comprised of photonic crystal fiber operating in an un-depleted pump regime. The formula of signal after phase regenerator is derived. For different incident power of signal, the relations between signal-pump phase difference and signal gain are discussed, as well as the influence of fiber length on signal output intensity. The optimum parameters of the phase regenerator are given. The distributions of phase and intensities for both the non-regenerated and regenerated signals are simulated. Simulations show that nearly ideal regeneration can be achieved for the DPSK signals.