非等幅OTDM信号的全光时钟提取

理论上推导了非等幅均匀复用的OTDM信号中时钟分量与各路脉冲幅度的关系式，并分别从频域和时域的角度给出了利用以半导体光放大器（SOA）作为调制器的锁模光纤激光器进行时钟提取的物理机制，对时钟提取的物理过程给出了形象解释.实验上通过利用锁模光纤激光器成功地从非等幅均匀复用的8×2.5 GHz OTDM信号中提取了2.5 GHz单路时钟和20 GHz群路时钟光脉冲.利用该方案提取的时钟脉冲稳定性好，对偏振态不敏感，是较理想的时钟源.此技术可用于高速OTDM信号的时钟提取.

All-optical Clock Recovery From Unequal-amplitude Multiplexed OTDM Signals

A theoretical analysis is given about the relationship between clock frequency components and pulse amplitude for unequal-amplitude even-multiplexed OTDM (Optical Time Division Multiplexing) signals, and physical mechanism of clock recovery based on SOA (Semiconductor Optical Amplifier) mode-locked fiber laser is demonstrated from the point of time domain and frequency domain respectively. In experiment, 2.5 GHz frame clock and 20 GHz bit clock are extracted from unequal-amplitude even-multiplexed 8×2.5 GHz signals by using SOA mode-locked fiber laser. The extracted clock pulses have several desirable features such as low timing jitter, broad wavelength tuning range and polarization independence. This technique can be applied to clock recovery in high-speed OTDM network.