多波长技术实现可扩展且可靠的光计算互连.pdf

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1、Brian Koch,VP of Engineering,Quintessent Inc.Alan Liu,Chris Cole,Robert Herrick,Justin Norman,John BowersTechnology for Scalable and Reliable Optical Compute InterconnectsApplications:AI/ML,XPU to XPUMemory disaggregationRequirements(vs.ethernet):Higher bandwidth per fiber,higher bandwidth densityLo

2、wer latencyMore energy efficientHigher reliabilityApplications,Requirements2Applications:AI/ML,XPU to XPUMemory disaggregationRequirements(vs.ethernet):Higher bandwidth per fiber,higher bandwidth densityLower latencyMore energy efficientHigher reliability,like copper computer I/OApplications,Require

3、ments3Applications:AI/ML,XPU to XPUMemory disaggregationRequirements(vs.ethernet):Higher bandwidth per fiber,higher bandwidth densityMore energy efficientHigher reliabilityApplications,Requirements,and SolutionQuintessent Approach:DWDM+CWDM architectureNovel silicon photonic integrated circuit desig

4、ns with integrated lasersMultiwavelength lasersQuantum dot gain material4Quintessents VisionQuantum dot comb laserCWDM mux/demuxMicroring modulator32l silicon photonic integrated circuitWavelengths per fiber8 -32 Signaling rate per 25 Gbps 128 GbpsBandwidth per fiber200 Gbps 4.1 TbpsBandwidth densit

5、y(including laser)0.8 4 Tbps/mm(edge)90-415 Gbps/mm2(areal)Link distanceUp to 2 kmLaser power0.1-0.5 pJ/bit5TxRxArchitecture Advantages32l silicon photonic integrated circuitCombined advantages ofDWDM:minimize high speed electrical signal loss and muxing to reduce power and latency,with high BW dens

6、ity and fewer fibersCWDM:minimal control vs.temperature,efficientFlexibility:high BW per fiber or breakoutCompact photonic devices for density and costQuantum dot comb laserCWDM mux/demuxMicroring modulator6TxRxQuantum Dot AdvantagesBetter temperature performanceReduced reflection sensitivityLow noi