网络：超低功耗、高密度并行microLED光链路.pdf

1、Ultra low-power,high-density parallel microLED optical links Suresh Rangarajan,Alex Tselikov,Rob Kalman,and Bardia Pezeshki Avicena,1225 Bordeaux Dr.,Sunnyvale,CA 94089 robavicena.tech Abstract:Parallel microLED-based optical links have the potential to provide very low power,low latency,high bandwi

2、dth density,and very low cost.We have demonstrated 1Tb/s/mm2.We review key technology and performance of these links.KeywordsHBM,UCIe,BoW,HPC,Optical Link,Optical Interconnect,Networks,Chip-to-Chip Commu-nication,Parallel Link,MicroLED,HPC,AI,ML I.INTRODUCTION There is a great deal of interest in sh

3、ort distance optical interconnects,for instance for inter-processor and processor-to-memory links.Silicon photonics(SiPh)links have been under development for 20 years have recently demonstrated energy/bit of 5pJ/bit using ring modulators and wavelength multiplexing in single mode polarization maint

4、aining fiber and with an external multi-wavelength distributed feedback(DFB)laser source 1,2.Vertical cavity surface-emitting laser(VCSEL)links have been under development for 30 years with the lowest power experiments showing links at 1pJ/bit 3.Gallium Nitride(GaN)microLEDs were originally develope

5、d for lighting and displays and have been used in free-space Visible Light Communications(VLC)4.We have demonstrated GaN microLEDs at data rates up to 14Gb/s 5;Fig.1 shows a 10Gb/s eye diagram from a microLED.Despite being under development for just the last few years,parallel optical links using Ga

6、N microLEDs have already demonstrated data rate density of 1Tbps/mm2 and power 1Tb/s.The modest per-channel speeds are well-matched to typical IC clock speeds and obviate the need for SerDes operating at tens of Gb/s.Arrays of these microLEDs can be transferred to silicon ICs with very high yields,f