子波长粒度光信号传输的频域均衡设计和性能分析

发布时间：2018-08-26 11:41

【摘要】：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。
[Abstract]:Aiming at the application of elastic optical network (EON), a subwavelength granularity optical signal transmission technology based on electrical domain subcarrier multiplexing is proposed, which has the characteristics of high flexibility, fine granularity and high efficiency. At the same time, the use of digital signal processing technology in electrical domain supports the flexible configuration of different sub-wavelength granularity signals, such as independent modulation mode, transmission rate and so on. In order to meet the transmission requirements of sub-wavelength grained optical signals in EON, a method of channel estimation and frequency-domain equalization (FDE) based on linearly chirped pilot signals is proposed. The performance comparison between pilot based FDE and time-domain equalization (TDE) based on training sequence, as well as the performance comparison of different FDE algorithms are studied and analyzed. The simulation results show that the zero-forcing FDE algorithm based on linear frequency chirped pilot signals can not only effectively compensate the dispersion and improve the transmission performance of the system, but also has the advantage of low algorithm complexity. At the same time, in order to meet the flexibility of sub-wavelength granularity EON for frequency slot and routing configuration, the effects of the number of sub-wavelength granularity optical signals, transmission distance and modulation order on the transmission performance are studied in detail by simulation. The simulation results show that the channel estimation based on linear frequency chirped pilot signal and the method of FDE have good adaptability under different optical network configurations. It is one of the key technologies to realize dynamic reconstruction of optical transceiver and sub-wavelength signal.
【作者单位】：电子科技大学通信与信息工程学院光纤传感与通信教育部重点实验室;
【基金】：国家自然科学基金(61471088)资助项目
【分类号】：TN929.1

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