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1、OCP Global Summit October 18,2023|San Jose,CAPeter Winzer,Nubis Communicationswww.nubis- Ultra-Dense and Ultra-Low Power 16x112-GbpsLinear-Drive Silicon Photonics for ML/AIOptical Package I/O For Advanced ML/AI ClustersHDI/O(High-density I/O for ML/AI)Ultra-high I/O densityTbps/mmUltra-low latency1
2、ns add-on over passive copperUltra-low power 6 pJ/bit(incl.laser,control)Intra-rack to inter-row 1 meter to 100s of metersCurrent I/OASICCurrent I/O Densities Dont Match ASIC NeedsASIC1:5fanout Fiber edge coupling limits density Fan-out increases trace length(channel loss)Needs WDM to scale:not idea
3、l for ML/AI interconnectFull-Duplex I/O DensityTransmission ReachHostI/ODie-to-die500 Gbps/mm 5 Tbps/mm2 mm substrate traceSerDes(100G,200G)500 Gbps/mm 1 Tbps/mm25-36 dB channel lossSystem I/OCopper Cable40 Gbps/mm 150 Gbps/mm1 2 mCurrent DR Optics80 Gbps/mm 250 Gbps/mm100s 1,000s mScalable Optical
4、HDI/O Needs 2D SolutionsFull-Duplex I/O DensityTransmission ReachHostI/ODie-to-die500 Gbps/mm 5 Tbps/mm2 mm substrate traceSerDes(100G,200G)500 Gbps/mm 1 Tbps/mm25-36 dB channel lossSystem I/OCopper Cable40 Gbps/mm 150 Gbps/mm1 2 mCurrent DR Optics80 Gbps/mm 250 Gbps/mm100s 1,000s m2D Optical HDI/O2
5、50 Gbps/mm multi-Tbps/mm100s 1,000s mASICCtrl2D HDI/O 2D HDI/OASIC 2D fiber array overcomes beachfront limitation Vertical fiber escape enables 2D HDI/O tiling No WDM needed Lower complexity,power,cost Higher architectural flexibility(full fan-out)ASICDataProcessingRetimerDSPSerDesSerDesSerDesOEOEOE
6、OEOEOEOEOEPower&Latency:Optics Must Look Like CopperCarefully designed opto-electronics are linear “Look like copper”to Host SerDes Eliminates Retimer DSP No additional latency relative to copper(2 x DSP adds 200 ns)Reduces I/O real estate and power consumption by 50%Copper Cable0 pJ/bit,2 mRetimed
7、Optics15 pJ/bit,2 kmLinear Direct-Drive Optics6 pJ/bit,2 kmNonlinear+MemoryLinear memoryLinear memoryHost SerDes Dont Handle Memory+NonlinearityTypical electrical channelTXSerDesPCBTraceRXSerDesLinear memoryMostly linearMostly linearPCBTraceCopper CablexxxEqualizerTypical direct-drive optics channel
8、TXSerDesPCB TraceRXSerDesPCB TraceFiberDriver,ModulatorPD,TIAUnequalized garbageNonlinear+MemoryLinear memoryLinear memoryTypical Optical NonlinearitiesTXSerDesPCB TraceRXSerDesPCB TraceFiberDriver,ModulatorPD,TIASampling pointSkewlyubomirsky_3db_01_1020Unequalmazzini_3bs_01_0914Amplitude nonlineari
9、tiesModulator,Driver,TIATime nonlinearitiesModulatorNonlinear fiber impairmentsCD,MPI,FWMNonlinear+MemoryLinear memoryLinear memoryLinear Optics Enable Traditional Host SerDes LinksTXSerDesPCB TraceRXSerDesPCB TraceFiberDriver,ModulatorPD,TIANubis XT1600TM,measured at 106 GbpsEqualSampling pointSamp
10、ling pointSkewlyubomirsky_3db_01_1020Unequalmazzini_3bs_01_0914Amplitude nonlinearitiesModulator,Driver,TIATime nonlinearitiesModulatorNonlinear fiber impairmentsCD,MPI,FWMLinearopticsminimize these issuesTraditionalSerDes compatiblelinkxxxNubis HDI/O Linear Optical Engine7mm5.5mm16 x 112 Gbps full-
11、duplex 4xDR4 HDI/O chipletIn-house Silicon Photonics,Equalizing Driver,TIAUp to 48 dB TX RX electrical channel lossML/AI ASIC(s)250 Gbps/mm 500 Gbps/mm 750 Gbps/mm Nubis Near-Package Optics Module:XT1600TM16 x 112 Gbps full-duplex socketed moduleMeasured 6.7 W(+2 W external laser)4.9 pJ/bit all-inAll 16 channels working with BER marginSampling to customers now!Visit us at www.nubis- OCP Global Summit|October 18,2023|San Jose,CA