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在高速光纤通信系统中码型的选择是决定系统传输质量和光谱效率的主要因素。码型的选择和信道速率、信道波长间隔、光放大器的选择、光放大器放置间隔、光纤的类型、色散管理策略等各种因素密切相关。分析了非归零码(NRZ)、归零码(RZ)和载波抑制归零码(CS-RZ)码型的产生方式及特点。采用单信道和掺铒光纤放大器(EDFA)放大方式对三种码型进行了40 Gb/s的100 km G.652光纤通信传输实验。比较了三种码型的系统传输特性、最佳入纤功率和不同入纤功率下的功率代价:载波抑制归零码最佳入纤功率为9 dBm,功率代价小于非归零码和归零码。结果表明,在相同的色散补偿条件下,载波抑制归零码比归零码和非归零码有更优的非线性容忍度。
The choice of pattern in high-speed optical fiber communication systems is a major factor that determines the transmission quality and spectral efficiency of the system. The choice of the pattern is closely related to various factors such as channel rate, channel wavelength spacing, optical amplifier selection, optical amplifier placement spacing, fiber type, dispersion management strategy, and the like. The generation modes and characteristics of non-return to zero (NRZ), return to zero (RZ) and carrier suppression to zero (CS-RZ) patterns are analyzed. Single-channel and erbium-doped fiber amplifier (EDFA) amplification was used to transmit 100 G.652 fiber-optic communication at 40 Gb / s for the three patterns. The system transmission characteristics of the three types of codes, the best fiber input power, and the power cost at different fiber input power are compared: the best fiber input power of carrier suppression zeroing is 9 dBm, the power cost is less than the non-zero return and zeroing code. The results show that under the same dispersion compensation condition, carrier suppression zero-return codes have better nonlinear tolerance than zero-return and non-return-zero codes.