提出并分析验证了一种基于半导体激光器注入锁定实现的全光时钟提取方案。方案中，借助半导体激光器的注入锁定过程，可以将光归零（RZ）码信号中的载波和一个时钟分量依次锁定两个半导体激光器获得光场的锁相输出，通过输出分量的叠加，得到所需的同步时钟信号。实验中，采用两个分布反馈（DFB）型半导体激光器，成功地获得了10 Gb/s光RZ码信号的时钟信号。这一方案在注入功率的动态范围、可调谐性、信号波长稳定性要求等方面都表现出了很好的灵活性，并具有可集成潜力，是一种实用性很强的新方法。

A scheme of all-optical clock extraction based on injection locked semiconductor laser is proposed and demonstrated. In the scheme, optical carrier and one clock component of return-to-zero (RZ) signal lock two semiconductor lasers to obtain the phase locked optical outputs. When these two components are coupled together, the recovery clock signal is achieved. Two distributed feedback (DFB) lasers are used to extract the clock signal of a 10 Gb/s RZ signal experimentally. This scheme is very flexible in dynamic range of injected power, tunability and stability requirements of signal wavelength. This novel technique also has potential in integration and practicability.