基于改进的标记率调制的光标签交换  

Optical Label Switching Based on Modified Mark Ratio Modulation

作　　者：李雪蒙 卢旸[1] 钱哲楷 张天恒 翟彦蓉 毕美华[1] Li Xuemeng;Lu Yang;Qian Zhekai;Zhang Tianheng;Zhai Yanrong;Bi Meihua(School of Communication Engineering,Hangzhou Dianzi University,Hangzhou 310016,Zhejiang,China)

机构地区：[1]杭州电子科技大学通信工程学院,浙江杭州310016

出　　处：《光学学报》2023年第9期31-37,共7页Acta Optica Sinica

基　　金：杭州电子科技大学研究生科研创新基金(GK228810299135)。

摘　　要：光标签交换(OLS)对基于分组的光交换是一种有吸引力的解决方案。标记比率调制(MRM)的方法是将标签信息叠加到载荷信息上。为了提高有效比特率,对标记比率调制进行了改进,将原来的四脉冲位置调制(4PPM)码改为一个新的5b8b码,使编码效率提高到了62.5%。同时,将偏振复用(PDM)与MRM结合使用,使比特率提高了一倍。标签接收器通过低速接收器直接接收来自偏振复用的标签信号,不需要使用偏振解复用,从而降低了成本。改进后的MRM在保持了MRM优点的同时,载荷的有效比特率比4PPM码的MRM提高了250%。仿真结果验证了改进的基于MRM的OLS的可行性。Objective Due to the rapid growth of packet-based traffic and data exchange in networks and data centers,the demand for optical packet switching is higher and higher.Traditional electrical switching adopts the form of optical-electric-optical switching,which has serious problems of electronic bottlenecks and high-power consumption and thus can hardly meet the growth demand of switching networks.Optical label switching transfers information exchange from the electrical domain to the optical domain,which improves the exchange rate and boasts high speed,transparency,low costs,large bandwidth,and low power consumption.Optical label switching is an effective solution to optical packet switching.It separates the label from the payload so that only the label is read at intermediate nodes without the need to detect the payload.At each node,part of the power of the optical packet is first extracted to the low-speed receiver for label detection.If the packet has the same destination address as the node,the packet is sent to the payload receiver.Otherwise,the packet is forwarded directly without being handled over any other layers.Optical label switching minimizes the overhead of packets and simplifies network control and management.As a result,the efficiency,scalability,and throughput are improved,especially in networks with numerous intermediate nodes.It is expected that modified mark ratio modulation can be helpful for optical label switching.Methods Mark ratio modulation is proposed in the paper.Firstly,the payload data is coded a new 5b8b code with a low mark ratio.Then,the coded payload data is combined with low-speed label data by XOR operation.After that,eight-bit cells are of a high or low mark ratio when the label bit is"one"or"zero",respectively.The label data is superimposed by mark ratio modulation.Subsequently,the mark-ratio-modulated data is divided into two sequences for the following polarization division multiplexing.The first four bits in each eight-bit cell are assigned to one sequence,and the last four

关 键 词：光通信 光标签交换 标记比率调制 高编码效率 偏振复用 

分 类 号：O436[机械工程—光学工程]