Zeng Tao
School of Optical and Electronic Information, Huazhong Uni. of Science and Technology, Wuhan Hubei 430074, China.
Opt Express. 2013 Jun 17;21(12):14799-807. doi: 10.1364/OE.21.014799.
We proposed a new method for superchannel transmission based on the newly proposed multi-channel equalization technique. This method allows us to realize tight channel spacing (equal to the baud rate) without using frequency-locked lasers and complex spectral shaping techniques at the transmitter. The inter-channel interference originated from the tight channel spacing is removed at the receiver by joint equalization of multiple adjacent channels. When the channel spacing is equal to the baud rate, our simulation results show that, with conventional oversample ratio (2 samples per symbol), realistic laser frequency offset and laser linewidth, the proposed multi-channel-equalization based method can achieve better performance than the traditional method using spectral shaping plus single channel equalization, although at the expense of a moderate increase in DSP complexity. The paper also gives a simple method to process the data after conventional chromatic dispersion compensation, which enables subsequent multi-channel equalization for long-haul transmissions.
我们基于新提出的多通道均衡技术提出了一种用于超通道传输的新方法。该方法使我们能够在发射端不使用锁频激光器和复杂的频谱整形技术的情况下实现紧密的信道间隔（等于波特率）。在接收端，通过对多个相邻信道进行联合均衡，消除了因紧密信道间隔而产生的信道间干扰。当信道间隔等于波特率时，我们的仿真结果表明，在传统的过采样率（每个符号2个样本）、实际的激光频率偏移和激光线宽条件下，尽管以适度增加DSP复杂度为代价，但基于多通道均衡的方法比使用频谱整形加单通道均衡的传统方法能实现更好的性能。本文还给出了一种在传统色散补偿后处理数据的简单方法，这使得能够对长距离传输进行后续的多通道均衡。
