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研究了160 Gb/s光时分复用(OTDM)系统的解复用技术。针对160 Gb/s速率的特点,对高非线性光纤(HNLF)的光纤环镜(NOLM)特性及解复用进行了数值仿真。计算了低信号光时间抖动下解复用误码特性对时钟与信号的走离及时钟功率的依赖关系。计算了三种走离值消光比随时钟功率增加的变化趋势并给出:存在一个能获得最大的解复用窗口消光比、并能降低相邻信道串扰的合适的时钟功率范围。利用自制的基于电吸收调制器和压缩技术的超短光脉冲源建立了160 Gb/s OTDM实验系统,测量了不同信号光功率下NOLM的消光比,它基本不随信号增大而变化,在信号功率为7.3 dBm时仍大于23 dB。利用上述装置实现了无误码的160 Gb/s到10 Gb/s全光解复用。
The technology of demultiplexing 160 Gb / s optical time division multiplexing (OTDM) system was studied. Aiming at the characteristics of 160 Gb / s rate, the numerical simulation of NOLM and demultiplexing of high nonlinear fiber (HNLF) was carried out. The dependency of the demultiplexing bit error rate (BER) on the departure of the clock and the signal and the clock power is calculated under low signal light time jitter. The variation trend of three extinction ratio extinction ratio with the increase of clock power is calculated and given that there is an appropriate range of clock power that can obtain the maximum extinction ratio of the window for demultiplexing and reduce the adjacent channel crosstalk. A 160 Gb / s OTDM experiment system was built using a homemade ultra-short optical pulse source based on electro-absorption modulator and compression technology. The extinction ratio of NOLM at different signal powers was measured. The extinction ratio of NOLM did not change with the increase of signal. It is still greater than 23 dB at 7.3 dBm. With the above device, an error free 160 Gb / s to 10 Gb / s full optical demultiplexing is achieved.