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Luxtera Company Overview
• Founded: 2001Spin Out from Caltech
• Headquarters
• Pioneered a new class of Semiconductor “Silicon CMOS Silicon CMOS Photonics”Photonics”• Headquarters
Carlsbad, CA
• Privately HeldShipping product for revenue
PhotonicsPhotonicsEnables Single CMOS chip opto-electronic transceiverBreaks both performance andShipping product for revenue Breaks both performance and price/performance barriers
• Strong Intellectual Property PortfolioPortfolio
Over 80 US Patents issuedOver 40 additional pending
2Brian Welch, [email protected]
Overview
• Motivations– IBTA Interconnect Roadmap
• Silicon Photonics– Technology Summary
• Contemporary Applications– 40 Gbps QSFP Active Optical Cables
• Next Generation Solutions– 25 Gbps per lane interconnects
• Beyond 25 Gbps
3Brian Welch, [email protected]
Motivations
• Enterprise interconnect throughput has increased by over 10x in the last d ddecade– From 10Gbps per link to 120
Gbps• Within two years solutionsWithin two years solutions
capable of over 300 Gbps will be required– Next generation enterprise
CPUs can deliver up to 320CPUs can deliver up to 320 Gbps of signaling
• Ability to scale out is limited, driving the need for d ti ll hi h i l
InfiniBand IBTA Roadmap Plans for 100G dramatically higher serial rates– Over 25 Gbps per Lane
EDR need for 2011
4Brian Welch, [email protected]
Silicon Photonics
• Silicon Photonics is a scalable platform capable of meeting the increasing needs of the enterprise world.
– Silicon Photonics has near infinite optical bandwidth.
Sili Ph t i l ith th ITRS d• Silicon Photonics scales with the ITRS roadmap, ensuring interconnects will not be the limiting factor in fabric developmentfactor in fabric development.
– Silicon Photonics scaling is cost neutral– Silicon Photonics scaling is cost neutral.
6Brian Welch, [email protected]
Silicon Photonics
Fully Integrated CMOSPhotonic, Analog & Digital Circuits
Standard CMOS Analog & Digital Circuits
Silicon Photonic Circuits
EPIC – Electro Photonic Integrated Circuit
Silicon Photonics
==++Waveguides Waveguide Structures
Vertical Couplers High/Low Speed Modulators
Added to standard Silicon Enables: Low‐cost highIntegrated PD & TIA/LAWaveguide Photo‐detectors
Luxtera’s CMOS Photonics technology
Added to standard Silicon CMOS chip fab and CMOS chip design flow
Enables: Low cost, high volume optics platform
7Brian Welch, [email protected]
Photonics and Electronics on a Common Wafer
Based on Commercial Process :• “Photonically-enabled” CMOS process
• “Pluggable” process modules added for photonicsgg p p• All processes and tools used are standard and fully
compatible with CMOS
Based on Commercial Process :“Photonically-enabled” CMOS process
“Pluggable” process modules added for photonicsAll processes and tools used are standard and fully
Poly Gate ContactsMetal 1
GeField Oxide
Salicide Block
p ocesses a d too s used a e sta da d a d u ycompatible with CMOS
Buried Oxide
Active Si
Si Substrate
Brian Welch, [email protected] 8
Silicon Photonics Key Components
25G Integrated Photodiodes25G MZ Modulators
Brian Welch, [email protected] 9
Wafer‐Scale TestingVertical Optical Coupling
Low Cost Light Sources for CMOS Photonics
• Integration of light sources with CMOS photonics:
• CW Laser always on – Like a DC
• For multi‐channel transceivers a single laser can be shared between the channels reducing laser costCW Laser always on Like a DC
power supply• Since the laser is always on, no need
for expensive high‐speed Lasers
the channels reducing laser cost
Micro‐packaged laser: Flip‐chip laser:Light Source
Passive Splitters 8 MZI
ModulatorsOptical
Interfaces
Brian Welch, [email protected] 10
Blazar 40 Gbps QSFP AOCLowest Power:
780 mW typical; 1.09 W MaxLongest Reach:
Up to 4,000 metersUp to 4,000 metersSingle Mode Fiber
Lowest Bit Error Rate:<10-15 Bit-Error Rate
Lowest Latency:QSFP PluggableQSFP Pluggable Lowest Latency:340ps per TX, 340ps per RX5ns per meter of fiber
High Bandwidth:42 Gbps (4 x 10 52 Gbps)
Q ggQ ggActive Cable AssemblyActive Cable Assembly
24 AWG Passive Copper<7m 42 Gbps (4 x 10.52 Gbps)
Standards Compliant: QSFP MSA mechanical complianceEthernet SFP+ compliant electrical interface
<7m
32 AWG Active Copper
<12mFiber4,000m
IBTA QDR compliant (UNH Certified)High Reliability:
MTBF > 5 Million hoursFIT < 200
12
Blazar 4x10 Gbps Silicon Photonics IC
Unprecedented Opto/Electronic CMOS IntegrationOptics• Fiber coupled directly to the die• Integrated wave guides• Integrated modulators• Integrated photo‐detectors
Analog and Digital Electronics
4x10 Gb/sElectricalSFP+
DigitalAnalog and Digital Electronics
• Integrated modulator driver
• Integrated amplifiers
• Integrated digital functions
Receivers
Transmitters O ti l
DigitalCore
• Integrated digital functions
Applications
• QDR 40G InfiniBand
• 4x10G and 40G Ethernet
4x10 Gb/sElectricalSFP+
Transmitters OpticalInterfaces
• PCIe Extensions
• 4x8G Fibre Channel
Monolithically integrated in mainstream SOI CMOS
Brian Welch, [email protected] 13
Monolithically integrated in mainstream SOI CMOS
Blazar MSA Compliant Packaging
Brian Welch, [email protected] 14
25 GBPS PER LANENext Generation Solutions
25 GBPS PER LANE INTERCONNECTS
Brian Welch, [email protected] 15
Challenges of Scaling in Conventional Technologies
• Copper Interconnects:– Increasing lane rates drives the need for heavier
gauge wiring, and/or shorter lengths– Increasing lane count increases fiber bulk and
decreases usabilitydecreases usability• Multi-Mode Interconnects:
– Increasing lane rate puts pressure on high speedIncreasing lane rate puts pressure on high speed VCSELs, mandating higher current densities
– Fiber core and photodiode spot sizes need to reduce to enable rate scaling
Brian Welch, [email protected] 16
Advantages of Silicon Photonics
• Silicon Photonics only requires electrical scaling with increased data rate.– Silicon Photonics optical components have OE
bandwidth far beyond any near term needs (over 100 GHz)GHz)
– Silicon Photonics interfaces and medium remain constant irrespective of rate
• Single mode fiber and waveguide type photodiodes
– Silicon Photonics light sources are unmodulated, and require no modification to support higher ratesrequire no modification to support higher rates
Brian Welch, [email protected] 17
Silicon Photonics at 25 Gbps
Luxtera’s Silicon Photonics is EDR InfiniBand Ready Now!
• Clean Transmitter and Receiver E l ith L Jitt R lt
Demonstrated 25G Performance
Eye along with Low Jitter Results in:
– Low Bit Error Rate– Long Reach
• No need for faster lasers– Current CW lasers can be reused
• Single Mode fiber is future proof– Over 2 Terabyte capable
• No significant incremental cost gover 40G
– Same Die size– Same Laser– Same Fiber
Brian Welch, [email protected] 18
INFINIBAND HDR AND OTHERBeyond 25 Gbps
INFINIBAND HDR AND OTHER ADVANCED FABRICS
Brian Welch, [email protected] 19
Beyond 25 Gbps
• HDR tentatively scheduled for 2014
il bilitavailability• HDR likely to push
signaling rates beyond 40signaling rates beyond 40 Gbps– Over 400 Gbps aggregate
interconnect throughputinterconnect throughput
• Terabit cables needed within the coming InfiniBand IBTA Roadmap Plans for 100G within the coming decade? EDR need for 2011
Brian Welch, [email protected] 20