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在单级调制器产生非归零码(NRZ)基础上,分析了利用双级调制器产生归零码(RZ)以及载波抑制归零码(CSRZ)的方法和特点。对非归零码,归零码和载波抑制归零码在以掺铒光纤放大器(EDFA)为单一的功率放大、以啁啾光纤光栅(CFBG)为色散补偿器的10Gb/s系统中的传输性能进行了计算机仿真并比较这三种调制码型的传输特性。同时在实际的2560km G.652光纤链路上利用上述三种调制格式以点对点形式进行了8×10Gb/s传输实验,通过适当控制线路的功率分配以及合理安排系统的色散补偿,实现了三种调制格式的无电中继条件下的零误码传输。计算机仿真和实际实验结果进一步表明,载波抑制归零码的采用有利于优化系统的传输性能,降低传输代价,载波抑制归零码在上述配置的实际传输系统中无误码传输2560km功率代价仅为2.5dB。
Based on the NRZ generated by a single-stage modulator, the methods and characteristics of zero-return codes (RZ) and carrier-suppressed zero-return codes (CSRZ) using two-level modulators are analyzed. For non-return to zero, return to zero and carrier suppression return to zero Transmission in a 10 Gb / s system with a single power amplification using an erbium-doped fiber amplifier (EDFA) as a dispersion compensator with a chirped fiber grating (CFBG) Performance Computer simulations were performed and the transmission characteristics of the three modulation patterns were compared. At the same time, 8 × 10Gb / s transmission experiments were carried out in point-to-point form on the actual 2560km G.652 optical fiber link. By properly controlling the power distribution of the lines and properly arranging the dispersion compensation of the system, three Zero error code transmission in the modulation format without power relay. Computer simulation and actual experimental results further show that the use of carrier suppression zeroing is beneficial to optimize the transmission performance of the system and reduce the transmission cost. The carrier suppression is zeroed. In the actual transmission system configured above, error-free transmission is achieved. The power cost of 2560km is only 2.5 dB.