High Throughput Passive Optical Interconnect Data Center Based On Orthogonal Technology

The rapid growth of network data traffic and the significant increase in the proportion of traffic in the data center have made the exchange traffic of the data center approach the upper limit of the bandwidth of traditional electrical equipment.Therefore,from electrical interconnection to optical interconnection has become an inevitable development trend of data centers.Optical interconnects can provide channel capacity unmatched by electrical interconnects to cope with the current explosive increase in bandwidth requirements.In addition,optically interconnected data centers also have advantages in terms of latency,energy consumption,and flexibility.Therefore,the optical interconnection data center has received widespread attention in the academic world.In the existing structure,the channel utilization rate is not high.First,the bandwidth utilization of a single channel is limited.In general,an optical channel can only transmit one channel of data,so the total data throughput of the data center cannot exceed the total number of channels.Second,the overall channel utilization rate is often low.Each node in the data center is generally interconnected with other nodes through multiple channels.However,a node generally cannot process multiple channels of data at the same time,so multiple channels connected to it cannot simultaneously access the node.In other words,if a node has access to a certain channel,other channels have to be idle,which reduces the overall utilization of the channel.Low channel utilization also limits the overall throughput of the data center.Therefore,from the perspective of "throttling",achieving single-channel multi-data transmission and node multi-channel access is equivalent to improving the utilization of existing bandwidth resources and increasing the throughput of the data center.To this end,this article aims at how to increase the channel utilization under limited bandwidth resources to increase the throughput of the data center.Firstly,the feasibility of quadrature modulation based on orthogonal modulation combined with multi-channel access scheme and optical label scheme is analyzed theoretically.Then verify the transmission characteristics of the above scheme in the data center optical interconnection through simulation.Mainly include the following parts(1)Firstly,the background,basic principles and current solutions of data center optical interconnection and the research significance of improving optical interconnect channel utilization are introduced.The domestic and international research status of data center optical interconnection is described in detail.(2)The internal data interaction scheme based on the combination of polarization multiplexing and orthogonal modulation is studied.To transmit more signals in one channel in the optical interconnection scheme,orthogonal modulation is used,effectively improving channel utilization.The feasibility of the scheme is verified by a 10Gb/s optical interconnect system.(3)In the data center optical interconnection system,the multi-channel access technology and the orthogonal format technology are combined.The multi-channel reception technology is adopted,so that the node can simultaneously receive and recover multiple signals.At the same time,it is combined with orthogonal format technology to reduce the cost of multi-channel access scheme while improve the channel utilization.Through the simulation,the feasibility is verified.(4)The optical interconnection scheme between different data centers is studied.In order to deal with the problem of slow transmission rate between data centers,a new optical mark ratio modulation technique is applied to optical label switching technology to replace the traditional routing scheme.Reduce the time required for data routing through optical label technology and improve channel utilization.