Silicon photonics integration roadmap for applications in computing systems
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1 Silicon photonics integration roadmap for applications in computing systems Bert Jan Offrein Neuromorphic Devices and Systems Group 2016 IBM Corporation
2 Outline Photonics and computing? The interconnect bottleneck The Von Neumann Bottleneck Optical interconnects for computing systems Optical interconnects roadmap CMOS Silicon Photonics Novel functionalities by adding new materials Photonic synaptic elements for Neural Networks Motivation Photonic Synaptic Processor Non-volatile optical memory elements Conclusions
3 Why Optics The interconnect bottleneck Physics of electrical links - going towards higher bandwidth Increased loss Increased crosstalk Resonant effects Physics of optical links 190 THz EM waves 50 THz Bandwidth available ( nm) Larger bandwidth X length product of optics Electrical coax cable: ~ 100 MHz km Multimode fiber: ~ 500 MHz km Single mode fiber: > 5000 MHz km Lower propagation loss of optical cables Electrical coax cable: ~ 1 db/m Multimode fiber: ~ 3 db/km Single mode fiber: > 0.3 db/km Power efficiency Larger density of optical links 3
4 Electrical and Optical Communication between two processors Physics of RF EM waves The signal is the carrier Physics of optical EM waves The signal is modulated on an optical carrier laser V driver modulator Electrical Transceiver Optical V amplifier Optical communication: 1000 x Larger bandwidth 1000 x Lower loss 100 x Larger distance Scalability & Power efficiency!!! However, many more components and assembly steps required!!! 4
5 backplane On processor On package On board At board edge Where to transition from electrical to optical? processor memory board Better performance, more disruptive, more development required 5
6 2011: IBM Power P775, High Performance Supercomputing System Processor Memory Fibers Fibers Processor Package Avago MicroPOD TM 6
7 Integration? Looking back, electronics Pictures taken at: Whirlwind, MIT, 1952 EAI 580 patch panel, Electronic Associates, 1968 Today s state of computing is based on: - Integration and scaling of the logic functions (CMOS electronics) - Integration and scaling of the interconnects (PCB technology & assembly) For optical interconnects, this resembles: - Electro-optical integration and scaling of transceiver technology - Integration of optical connectivity and signal distribution 7
8 Could one INTEGRATE the electrical and optical functions into the system?? Transmit & receive optical signals Distribute optical signals Vision: Electrical and optical communication embedded in a computing system 8
9 CMOS Silicon photonics Integrate electrical & optical functions in silicon 9
10 4 λ x 25 Gb/s optical transceiver demonstration Rx3 Tx0 Rx2 Tx1 Rx1 Tx2 Rx0 Tx3 as transmitted from Tx0 as measured on Rx3 Demonstration of a flip chip mounted 100G transceiver with four wavelength multiplexing at 25 Gb/s each. 10
11 CMOS Embedded III-V on silicon technology BEOL FEOL SiO 2 Electrical contacts Front-end III-V Si SiO 2 Si wafer CMOS Si Photonics + III-V functionality Overcome discrete laser and assembly cost New functions, directly combining electronics, passive and active photonics 11
12 CMOS Silicon photonics Silicon photonics integration roadmap laser V laser V Directly modulated laser driver modulator driver modulator driver V amplifier V amplifier V amplifier Laser specs Wavelength 1300 nm Optical Power 20 mw 10 mw 2.5 mw Electrical Power 200 mw 100 mw 50 mw Total link 25 Gb/s Laser: 200 mw Modulator: 900 mw TIA: 100 mw Total: 1200 mw Laser: 100 mw Modulator: 900 mw TIA: 100 mw Total: 1100 mw Laser: 50 mw Laser driver: 100 mw TIA: 100 mw Total: 250 mw 12
13 IBM Research - Zurich Processing scheme SiO 2 epi layer 5 InAlGaAs quantum wells (MOCVD) III-V epi layer SiO 2 SiPh wafer Feedback grating Wafer bonding SiPh wafer SiO 2 SiO 2 Substrate removal III-V structuring MQW section SiO 2 13 Bert Jan Offrein Metallization 2017 IBM Corporation
14 IBM Research - Zurich Optically pumped ring laser Measured FSR: nm Estimated FSR from ring: nm Estimated FSR from III-V: nm Lasing with feedback from silicon photonics Directional coupler output Gain section 14 Bert Jan Offrein 2017 IBM Corporation
15 IBM Research - Zurich Electrically pumped lasing Optical spectrum at 110 K 5000 Counts (a.u.) Lasing modes Spontaneous emission Wavelength (nm) Laser devices: 10 db optical loss at room temperature Cooling down increases gain Increased gain can overcome loss Pulsed electrical pumping 15 Bert Jan Offrein 2017 IBM Corporation
16 Could one INTEGRATE the optical functions into the system?? Transmit & receive optical signals Distribute optical signals Vision: Electrical and optical communication embedded in a computing system 16
17 Outline Photonics and computing? The interconnect bottleneck The Von Neumann Bottleneck Optical interconnects for computing systems Optical interconnects roadmap CMOS Silicon Photonics Novel functionalities by adding new materials Photonic synaptic elements for Neural Networks Motivation Photonic Synaptic Processor Non-volatile optical memory elements Conclusions
18 Neuromorphic hardware for big data analytics GPU Today s status on deep neural networks Software based on Von Neumann systems Training is the bottleneck HPC required GPU accelerators processing - memory bottleneck Fast and efficient neural network data processing 1. Analog approximate signal processing 2. Tight integration of processing and memory x improvement using crossbar arrays Metal electrode Tunable resistance Hardware implementations Electrical crossbar arrays Photonic crossbar arrays Metal electrode Synaptic element Crossbar array 2017 IBM Corporation 18
19 Resistance Accelerated learning: Analog crossbar arrays Update weight proportional to signals on crossbar row and column Increase and decrease of weight Symmetric behavior for positive and negative updates High weight resolution (~1000 levels) required Physical challenge: Identify material systems fulfilling those requirements Training Feedforward Deep Neural Network Information flow Input layer Hidden layers Output layer Synaptic weight Inference symmetry # of levels δ x target non-ideal x Training cycle W x 2017 International Business Machines Corporation
20 Photonic crossbar unit - operating principle Electrical crossbar Photonic crossbar δ Forward propagation Backward propagation Weights δ x W T δ x W T δ W x Electrical wires Local weights Resistance tuning W x Writable photorefractive gratings provide the same functionality as the tunable resistive elements in a crossbar unit Planar waveguiding Distributed weights Refractive index tuning 20 Copyright 2017
21 2 source signals Weighted and combined signal Photonic crossbar unit Alternative crossbar physical principle leveraging the photorefractive effect Demonstrated in 3D free space photonic neural networks in the 90s i.e. Hughes Research Laboratories New developments we can leverage Integrated optic technology Co-integration of new materials Non-volatile weights applying the photorefractive effect Grating writing by interference of optical plane waves in an electro-optic material Strength proportional to product of the amplitudes of the writing beams Written grating acts as the synaptic interface between plane optical waves Copyright 2017
22 Diffraction from a photorefractive grating Measurement on a thick GaAs layer Two-wave mixing in bulk GaAs single synapse Mirror Detection SM fiber Beamsplitter Phase modulator GaAs Polarizer Collimator Incident light Mirror Detection 22
23 FEOL BEOL IBM Research - Zurich CMOS Embedded III-V on silicon technology SiO 2 Electrical contacts Front-end III-V Si SiO 2 Si wafer CMOS Si Photonics + III-V functionality Overcome discrete laser and assembly cost New functions, directly combining electronics, passive and active photonics & photorefractive materials 23 Bert Jan Offrein 2017 IBM Corporation
24 MOCVD-based growth of epitaxial GaAs core and InGaP cladding Development of low-temperature grown GaAs on (110) GaAs wafers T g = 440 C with 600 C pre-bake under As for oxide desorption. Atomically flat layers obtained. Decreasing growth temperature using high V/III ratio results in a semi-insulating (10 14 cm -3 ) material containing electron traps R Pt RMS ~ 0.3 nm (EL2?). III-V AFM n ~ cm -3 μ n ~ 414 cm 2 /Vs R RMS ~ 0.2 nm Development of InGaP cladding layer Tuning the content of In x Ga 1-x P allows to grow layers lattice matched to GaAs. Further development steps include the growth of a thick Scratches holes ~ nm deep InGaP cladding with a low-temperature grown EL2-containing GaAs. XRD XRD signal [cps] XRD signal [cps] XRD signal [cps] I. II. GaAs IBM Corporation 2 [ ] 24
25 Conclusions Photonics technology helps to overcome interconnect bottlenecks Communication at scale Von Neumann bottleneck Applications for computing Optical interconnects Training of synaptic weights in neural networks Extend silicon technology III-V but also other types such as ferroelectric Photorefractive, optical gain, switching, optical weights + large variety of other opportunities and applications 2017 IBM Corporation 25
26 Acknowledgments IBM Research Zurich, Switzerland Stefan Abel, Folkert Horst, Marc Seifried, Gustavo Villares, Roger Dangel, Felix Eltes, Jacqueline Kremer, Jean Fompeyrine, D. Caimi, L. Czornomaz, M. Sousa, H. Siegwart, C. Caer, Y. Baumgartner, D. Jubin, N. Meier, A. La Porta, J. Weiss, V. Despandhe, U. Drechsler Co-funded by the European Union Horizon 2020 Programme and the Swiss National Secretariat for Education, Research and Innovation (SERI)
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