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分析并实验验证了一种全光纤锁模激光器结构的全光时钟提取方案。方案中,采用高非线性光纤(HNLF)替代传统结构中的半导体光放大器(SOA),利用光纤中的交叉相位调制(XPM)效应实现腔内的非线性调制,避免了以SOA作为非线性光调制器件的锁模激光器全光时钟提取方案中,由于载流子恢复时间较长从而限制工作速率的缺点,以达到突破“电子瓶颈”的目的。理论分析了光纤中交叉相位调制的特性以及环形锁模腔的时钟提取原理,并通过实验,从40Gbit/s的光归零码(RZ)信号中提取出了高质量的光信号时钟。该方案可以直接在更高速率条件下工作。
An all-optical clock extraction scheme of all-fiber mode-locked laser structure is analyzed and experimentally verified. In the scheme, HNLF is used to replace the semiconductor optical amplifier (SOA) in the traditional structure, and the non-linear modulation in the cavity is realized by using the cross-phase modulation (XPM) effect in the optical fiber, thereby avoiding that the SOA is used as the nonlinear light Modulation device mode-locked laser all-optical clock extraction scheme, due to the longer carrier recovery time to limit the shortcomings of the work rate, in order to achieve a breakthrough “electronic bottleneck” purposes. The characteristics of cross-phase modulation in fiber and the clock extraction principle of ring-shaped cavity are theoretically analyzed. The high quality optical signal clock is extracted from the 40Gbit / s RZ signal by experiments. The program can work directly at higher rates.