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利用从非归零(NRZ)信号中全光提取的时钟,采用太赫兹光非对称解复用器(TOAD)实现了10 Gbit/s非归零码到归零(RZ)码的码型转换。非归零信号采用半导体光放大器(SOA)进行时钟分量增强并用平面波导阵列(AWG)滤出相应的伪归零(PRZ)信号,然后采用半导体光放大器注入锁模光纤环形激光器进行时钟提取,提取的时钟信号和待转换的非归零信号分别作为抽运光和探测光输入太赫兹光非对称解复用器,在其中进行码型转换。转换后输出的归零信号的质量仅由恢复的时钟信号和非归零信号的质量决定,受太赫兹光非对称解复用器中半导体光放大器增益恢复时间的影响极小。实验测得转换后的归零信号消光比为8.7 dB,码型效应非常低,其光谱明显展宽,并且出现谱间隔为0.08 nm的多峰结构,与10 Gbit/s的比特速率相对应。该方法对时钟信号的码型效应有一定的容忍度。
A 10 Gbit / s non-return to zero (RZ) code pattern conversion is achieved using a terahertz optical asymmetric demultiplexer (TOAD) using a clock extracted from all-optical light in a non-return to zero . Non-return-to-zero signals are amplified by the SOA and the PRN signals are filtered out by a planar waveguide array (AWG). The semiconductor optical amplifiers are used to inject the mode-locked fiber ring laser for clock extraction and extraction The clock signal and the non-return-to-zero signal to be converted are respectively input to the terahertz optical asymmetric demultiplexer as the pump light and the probe light, and the pattern conversion is performed therein. The quality of the zero-return signal output after conversion is only determined by the quality of the recovered clock signal and the non-return-to-zero signal, and is minimally affected by the gain recovery time of the semiconductor optical amplifier in the asymmetric terahertz demultiplexer. The experimental results show that the extinction ratio of the converted zero signal is 8.7 dB. The pattern effect is very low. The spectrum of the converted signal is obviously widened and the multi-peak structure with spectral spacing of 0.08 nm appears, corresponding to the bit rate of 10 Gbit / s. This method has a certain tolerance to the code effect of the clock signal.