等幅均匀复用OTDM信号的单路和群路时钟提取

All Optical Bit and Frame Clock Recovery From Equal-amplitude Even-multiplexed OTDM Signals

提出了针对等幅均匀复用的光时分复用信号进行全光时钟提取的一种新方案,理论上分析了该方案的可行性,并给出了各次谐波时钟频率分量大小的表达式.实验上利用该方案成功地从等幅均匀复用的8×2.5GHz信号中提取出了2.5GHz单路时钟和20GHz群路时钟光脉冲.此技术可应用于高速OTDM信号的时钟提取.

A novel all-optical clock recovery scheme based on 'Intensity reshaper' and mode-locked semiconductor fiber ring laser is demonstrated for equal-amplitude even-multiplexed OTDM signals, which simplifies signal generation and propagation in high-speed OTDM systems. In theory, a mathematical expression is given about the intensity of harmonic of clock-frequency component. The relative intensity of every frequency component will change by adjusting the PC in the 'Intensity reshaper', so the desirable clock-frequency component can be enhanced, which is helpful for clock recovery. In experiment, 2.5 GHz frame clock and 20 GHz bit clock are extracted from equal-amplitude even-multiplexed 8 × 2.5 GHz OTDM signal by using this scheme. 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.