基于LRO的可插拔VCSEL和SiP收发器适用于AI集群.pdf

1、Maxim Kuschnerov1,Youxi Lin1,LeweiZhang1,RuoxuWang1,Quan Yu1,JiansiTan1,Min Sun2,ShengleiHu2,SidongFu21 Huawei,2 TencentLRO-based Pluggable VCSEL and SiP Transceivers for AI clustersLRO-based Pluggable VCSEL and SiPTransceivers for AI clustersMaxim KuschnerovSPECIAL FOCUS:PHOTONICSOptics use case fo

2、r AI clusters in scale-out network Optical modules in GPU side are more power sensitive,while inter-operability is required between GPU&SwitchResilienceIO densityPowerLatencyCostNext generation optical networking guided by AI compute prioritiesDemand for Optics in an AI networkRetimed vs.Linear Plug

3、gable Optics(LPO)vs.Linear Receive Optics(LRO)Retimed LPOLROoDSP in pluggableTx&Rx oDSPNo oDSPTx oDSP/no Rx oDSPEvolvement capability224G commercial available224G technically challenging224G technically feasible MaintainabilityEasy to maintainDifficult to maintainManage to maintainInter-operabilityE

4、/O interface fully separate E/O interface correlated Tx-interop is more crucial than RxPower efficiencyFull oDSP,18 pJ/bitFull oDSP power removed,11 pJ/bitMajority of oDSP power removed,12.5 pJ/bitLatencyHighNo oDSP latencyMajority of oDSP latency removed Good system engineering always comes from go

5、od balance!Link consideration for 112G linear technology The LRO has E2E lower loss compared with LPO,which enables the VCSELs solution with more margin in 112G/laneThe LPO needs to be capable of being adaptive to large dynamic range of link loss128 ports switch for 112G/lane Die to die Loss variati

6、on(dB)8 16 for Egress/Ingress;16 32 for Egress+IngressPotential solutions for LRO VCSELs,Si Photonics,EMLPotential solutions for LPO Si Photonics VCSEL vs.SiP LRO modules verification for 112G/lane Online tests based on 400G LRO throughout 128 ports switch for