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针对弹性光网络(EON)的应用,提出了一种基于电域子载波复用的子波长粒度光信号传输技术,具有高灵活性、细粒度、高效率等特点。同时,电域数字信号处理技术的使用,支持对不同的子波长粒度信号进行独立的调制方式、传输速率等灵活配置。为了适应子波长粒度光信号在EON中的传输要求,还提出了一种基于线性频率啁啾导频信号的信道估计和频域均衡(FDE)的方法,重点研究和分析了基于导频的FDE和基于训练序列的时域均衡(TDE)的性能对比,以及不同的FDE算法的性能对比。仿真结果表明,基于线性频率啁啾导频信号的迫零FDE算法,不仅能有效进行色散补偿,改善系统传输性能,而且具有低算法复杂度的优势。同时,为了满足了子波长粒度EON对频隙和路由配置的灵活性需求,通过仿真详细研究子波长粒度光信号的数目、传输距离和调制阶数等对传输性能的影响。仿真结果表明,基于线性频率啁啾导频信号的信道估计和FDE的方法,在不同的光网络配置下均具有良好的适应性,是实现灵活可调的光收发机和子波长信号动态重构的关键技术之一。
Aiming at the application of elastic optical network (EON), a sub-wavelength granular optical signal transmission technology based on electric domain subcarrier multiplexing is proposed, which has the characteristics of high flexibility, fine granularity and high efficiency. At the same time, the use of electric domain digital signal processing technology supports different modulation modes and transmission rates for different sub-wavelength granular signals. In order to meet the transmission requirement of sub-wavelength optical signals in EON, a channel estimation and frequency-domain equalization (FDE) method based on linear frequency chirp pilot signals is also proposed. The emphasis is put on the research and analysis of pilot-based FDE And training sequences based on time domain equalization (TDE) performance comparison, as well as different FDE algorithm performance comparison. Simulation results show that the zero-forcing FDE algorithm based on linear frequency chirp pilot signals can not only effectively perform dispersion compensation and improve the system transmission performance, but also have the advantage of low algorithm complexity. At the same time, in order to meet the requirement of sub-wavelength granularity EON for the flexibility of frequency slot and routing configuration, the simulation studies the effect of sub-wavelength granularity optical signal number, transmission distance and modulation order on transmission performance. The simulation results show that the channel estimation and FDE based on the linear frequency chirp pilot signal have good adaptability in different optical network configurations and are flexible and adjustable optical transceiver and sub-wavelength signal dynamic reconfiguration One of the key technologies.