Versatile Link+
Versatile Link PLUS
Francois VaseyEP-ESE-BE
on behalf of the VL+ collaboration
Based on a presentation by C. Soos, TWEPP16
Versatile Link+Outline
1. Versatile Link PLUS project introduction2. VL+ front-end module3. Cables, connectors and integration4. Backend
5. VL + project roadmap
● Note: this is not an exhaustive description of the project status, but a digest focusing on VL+ system development and roadmap. Apologies to those whose work was only superficially covered.
ATLAS Upgrade Week Nov 2016 [email protected] 2
Versatile Link+1. Introduction to Versatile Link PLUS
● The Versatile Link PLUS project (VL+) targets the phase II upgrades of the ATLAS and CMS experiments
● VL+ was officially announced at ACES 2014 and started on 1 Apr 2014. It is subdivided in three phases of 18 months each: ● Phase 1: proof of concept (Apr 2014 – Oct 2015)● Phase 2: feasibility demonstration (Oct 2015 – Apr 2017)● Phase 3: pre-production readiness (Apr 2017 – Oct 2018)
● Collaboration between CERN, FNAL, Oxford, and SMUVersatile Link Versatile Link PLUS
Optical mode Single- and multi-mode Multi-mode
Flavours 1Tx+1Rx, 2Tx Configurable (up to 4Tx)+(1Rx)
Radiation level Up to Calorimeter grade Up to Tracker grade
Form factor SFP+ Custom miniature
Data rate Tx/Rx: 5 Gb/s Tx: 5/10 Gb/s, Rx: 2.5 Gb/s
Table : Key differences between VL and VL+
ATLAS Upgrade Week Nov 2016 [email protected] 3
Versatile Link+Versatile Link PLUS architecture
FPGA
TX
RXVCSEL(array)
LDD(array)
PINTIA
Off-DetectorCommercial Off-The-Shelf (COTS)
Custom Protocol
SERDES
SERDES
SERDES
lpGBTor otherSERDES
On-DetectorCustom Electronics & Packaging
Radiation Hard
Versatile Link PLUS
Ligh
t cou
plin
g un
it
Passives
VTRx+
ATLAS Upgrade Week Nov 2016 [email protected] 4
Versatile Link+2. VL+ front-end module
● Versatile● Up to 4Tx + up to 1 Rx, configurable at build time or by masking channels● 4Tx + 4Tx may become feasible (TBD)
● MM only● 850 nm VCSEL● InGaAs PIN (TBC)
● Miniaturised● Target dimensions 20 x 10 x 2 mm
● Pluggable● Either optical or electrical (or both)
connector● Data-rate:
● Tx: up to 10 Gb/s (nominal 5Gb/s or 10Gb/s)● Rx: up to 5 Gb/s (nominal 2.5Gb/s)
● Environment● Temperature: -35 to + 60 °C● Radiation (based on Tracker requirements)
● Total Dose: 1 MGy qualification (investigations up to 2 MGy)● Total Fluence: 2x1015 n/cm2 and 1x1015 hadrons/cm2
FPG
A
TX RX
VTR
x+
SER
DES
SER
DES
SER
DES
SER
DES
VTRx
VL+
ATLAS Upgrade Week Nov 2016 [email protected] 5
Versatile Link+VL+ front-end module variants
1 TX + 1 RX 3 TX (single channel LDDs) + 1 RX 4 TX (single channel LDDs)
1/3/4 TX (using LDD array) + 1 RX 4/8 TX (using LDD arrays)
Discrete-basedderived from:• Light peak• USB-3• ThunderboltConfigured at buildtime
Array-basedderived from:• QSFP+ engine• Mid-Board engineConfigured at turn on
ATLAS Upgrade Week Nov 2016 [email protected] 6
Versatile Link+Dual approach
A. Modification of existing commercial modules● Working in close collaboration with module manufacturers
●Minimise customisation to retain cost benefit from volume production, and profit from extensive product qualification
● Will result in 4Tx + 1Rx engine, but will violate the 2mm height spec
B. In-house design of full-custom module● Working in close collaboration with suppliers of optical coupling blocks● Working in close collaboration with industrial partners on integration
●CERN-designed PCB●CERN-specified opto-die●CERN-designed ASICs (LDD, TIA-LA)
● Potentially the path to highest level of affordable customisation
ATLAS Upgrade Week Nov 2016 [email protected] 7
Versatile Link+A. Commercial module customization
● Progression from standard component to customized object suitable for CERN project needs● Start with evaluation of standard component and sub-components (Steps 0/1) on a per-
vendor basis
ATLAS Upgrade Week Nov 2016 [email protected] 8
CERN Market Survey MS-4236 CERN Invitation to Tendercustomization of commercial module
Versatile Link+A. Testing candidate commercial modules
● First samples from various module vendors have been functionally tested in the laboratory (Step 0). More samples are coming.
● Modules containing only optical components have been requested for environmental tests (Step 1)
Target size
ATLAS Upgrade Week Nov 2016 [email protected] 9
Versatile Link+B. In-house full custom designs
● In-house design and development of full custom module● First two prototypes are based on same active components
● Single-channel laser driver (commercial) and CERN radiation tolerant TIA (GBTIA)● 14 Gb/s VCSEL/photodiode from Philips Photonics (ULM)
● Their optical coupling blocks are different● V1 is using US conec’s Mechanical Optical Interface (MOI) + Prizm (up to 8 channels)● V2 is using a low-profile optical coupling unit (up to 4 channels)
4.5 mm
2.8 mm
19 mm
V1 V2
ATLAS Upgrade Week Nov 2016 [email protected] 10
Versatile Link+B. V1 and V2 prototype functional tests
5Gb/s 10Gb/s
All prototypes 1 deviceoptical mating/demating
11
4.8Gb/s 10Gb/s
All prototypes 2 prototypesoptical mating/demating
V1 V2
Versatile Link+B. Full-custom VL+ front-end – V3
● First prototype based on custom ASICs and commercial optical components● Quad laser driver (SMU- LDQ10) and TIA
(IN2P3-GBTIA)● 14 Gb/s VCSEL array/photodiode from
Philips Photonics (ULM)● US conec’s MOI● QSFP interface
● 4 Tx + 1 Rx configuration● Assembled by the same industrial partner
as V1 and V2
ATLAS Upgrade Week Nov 2016 [email protected] 12
Versatile Link+V3 prototype functional tests
5Gb/s 10Gb/s
13
4.8Gb/s 10Gb/s
V1 V3
V1, V2:- 1Tx + 1Rx- Commercial laser driver- Rad soft- SFP+ electrical interface
V3:- 4Tx + 1Rx- Custom LDQ10 laser driver- Rad hard- QSFP electrical interface
Versatile Link+VCSEL reliability in non-hermetic package
● 85/85 RH measurements● TOSA● Bare VCSEL● V1 package
ATLAS Upgrade Week Nov 2016 [email protected] 14
Versatile Link+VTRx+ summary
● VTRx+ prototype demonstrated up to 10Gbps(Tx) / 5Gbps(Rx)● In-house full custom design● GBTIA and LDQ10 rad hard ASICs● Validated VCSEL array and Pin● Next step: squeeze to 20 x 10 x 2 mm target● Few samples available for in-detector testing
● Commercial modules identified and under investigation● Procurement framework established● First customization steps launched● Unlikely to fully comply with 20 x 10 x 2 mm target● Would 20 x 10 x 4 mm be OK?
ATLAS Upgrade Week Nov 2016 [email protected] 15
Versatile Link+3. Cabling and Integration
ATLAS Upgrade Week Nov 2016 [email protected] 16
Versatile Link+Fibre Radiation-Induced Attenuation
ATLAS Upgrade Week Nov 2016 [email protected] 17
Cumulated radiation induced attenuation (RIA) along light path Dose-rate dependence of RIA as a function of total dose
Versatile Link+Connectors capacity and insertion loss
● New connectors under investigation● Promise for high density (nx12, n
Versatile Link+Cabling and Integration Summary
● By end of VL+ project phase II (Q1-2017):● Updated VTRx+ footprint● Proposal for patch cords, cables and connectors● Now is the right time to have preliminary discussions
ATLAS Upgrade Week Nov 2016 [email protected] 19
Versatile Link+4. Backend
● Evaluated commercial mid-board optics from 4 suppliers● 10Gbps multi-channel modules will be a commodity by 2020● Nevertheless, compliance with VL+ spec is mandatory● Board designers, please follow VL+ selection guide, once available
ATLAS Upgrade Week Nov 2016 [email protected] 20
Versatile Link+5. VL+ phase II deliverables (Apr 2017)
● Detailed specifications for components and system● Components and Variants shortlist● Front-end Transceiver package definition and prototype
fabrication integrating ASICs and validated optoelectronics● Complete set of functionality test results for all components● Complete set of irradiation test results for front-end and
passive components● Complete set of reliability test results for front-end
components● System demonstrators with validated components● Preliminary evaluation of production costs versus volume
ATLAS Upgrade Week Nov 2016 [email protected] 21
Versatile Link+5. VL+ phase III deliverables (Oct 2018)
● Specification freeze● Formal procurement framework in place for production● Validation of samples supplied for procurement framework
(functionality and radiation hardness)● Manufacturers shortlist● Production cost matrix● Documentation
ATLAS Upgrade Week Nov 2016 [email protected] 22
Versatile Link+Backups
ATLAS Upgrade Week Nov 2016 [email protected] 23
Versatile Link+Commercial roadmap
● Development (until 2018)● CERN Market Survey
●CERN issues Technical Requirement & Questionnaire●Companies return completed Questionnaire●CERN reserves the right to order samples (Steps 0, 1) and/or ASIC drop-
ins to existing parts for evaluation (Steps 2, 3)●CERN qualifies companies having required technology
● CERN Price Enquiry●Qualified companies receive full technical specification for development●Qualified companies bid for development (Step 4)
● Production (2019 onwards)● Companies having successfully completed development (on time, in budget)
will be invited to tender for full production● One or two lowest cost bidder(s) will receive production contract
ATLAS Upgrade Week Nov 2016 [email protected] 24
Versatile Link+Custom module development roadmap
Q3’15 Q4‘15 Q1‘16 Q2’16 Q3’16 Q4’16 Q1’17
2ch TRx v1MOISFP+CERN TIACommercial LDD
2ch variantOpto I/FElectrical I/FRxTx
2ch TRx v2Low-profileSFP+CERN TIACommercial LDD
4ch variantOpto I/FElectrical I/FRxTx
4ch TRx v1MOIQSFPGBTIALDD array
Legend:MOI – Mechanical Optical InterfaceGBTIA – CERN receiver ASICGBLD10+ – CERN single-channel VCSEL driver ASICLDD array – 4-channel Laser Diode Driver array
Dec
isio
n to
be
mad
eba
sed
on fe
asib
ility
stud
ies
6 months
ATLAS Upgrade Week Nov 2016 [email protected] 25
Versatile Link PLUS���Francois Vasey�EP-ESE-BE��on behalf of the VL+ collaboration��Based on a presentation by C. Soos, TWEPP16����Outline1. Introduction to Versatile Link PLUSVersatile Link PLUS architecture2. VL+ front-end moduleVL+ front-end module variantsDual approachA. Commercial module customizationA. Testing candidate commercial modules B. In-house full custom designsB. V1 and V2 prototype functional testsB. Full-custom VL+ front-end – V3V3 prototype functional testsVCSEL reliability in non-hermetic packageVTRx+ summary3. Cabling and IntegrationFibre Radiation-Induced AttenuationConnectors capacity and insertion lossCabling and Integration Summary4. Backend5. VL+ phase II deliverables (Apr 2017)5. VL+ phase III deliverables (Oct 2018)BackupsCommercial roadmapCustom module development roadmap