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在对预编码、调制和编码过程进行改进的基础上,提出了一种利用一个双臂马赫-曾德尔铌酸锂调制器和一个电信号时延器产生可调占空比和消光比的光暗脉冲归零码二进制信号的新方案。实验证明这种信号能用传统的二进制强度调制-直接检测系统的接收机进行检测。实验得到了在调节电信号时延器时速率为2.5 Gbit/s的光暗脉冲归零码二进制信号的频谱变化规律,以及占空比分别为0.25,0.35,0.60和0.80时光暗脉冲归零码二进制信号的误码率和眼图。此外,利用该方案产生的光暗脉冲归零码二进制信号可以作为标记在光标记交换网络中得到应用。
Based on the improvement of the pre-coding, modulation and coding processes, a method is proposed to generate adjustable duty cycle and extinction ratio using a two-arm Mach-Zehnder LiNbO 3 modulator and an electrical signal delay Dark pulse return zero binary signal of the new program. Experiments have shown that this signal can be detected using a conventional binary strength modulation-direct detection system receiver. Experiments have been made to adjust the electrical signal delay when the rate of 2.5 Gbit / s light-dark pulse zero-change binary signal spectrum changes, and the duty cycle were 0.25,0.35,0.60 and 0.80 time dark pulse zeroing code Binary signal bit error rate and eye diagram. In addition, the light-dark pulse generated by this scheme can be used as a marker in the optical label switching network.