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针对单模光纤的容量极限问题,利用少模光纤实现了4×100Gbit/s的双偏振正交相移键控交叉复用的长距离准单模双向传输,达到了1700km的传输距离。对系统中多径干扰(MPI)和二次瑞利散射(DRS)分别进行了研究。利用301个抽头的恒模算法有效补偿了长距离传输过程中的MPI损伤,使系统的传输性能提高了约1dB。使用波形整形器有效抑制了DRS导致的信号质量劣化。结果表明,这些处理方法可将系统的传输距离从1400km延长到1700km。
In view of the capacity limit problem of single-mode optical fiber, long-range quasi-single-mode bidirectional transmission of 4 × 100Gbit / s dual-polarization quadrature phase-shift keying interleaved is achieved by using a small mode optical fiber, achieving a transmission distance of 1,700km. The multipath interference (MPI) and the second Rayleigh scattering (DRS) in the system were studied respectively. The 301-tap constant modulus algorithm effectively compensates for MPI damage during long-distance transmission and improves the transmission performance of the system by about 1dB. The use of a waveform shaper effectively suppresses signal quality degradation caused by DRS. The results show that these treatment methods can be extended system transmission distance from 1400km to 1700km.