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Versatile Link Status Report

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16 diapositives · 303 Views · Aug 17, 2014

The Versatile Link Project aims to establish a bidirectional optical link with up to 5Gbps speed, leveraging both multimode (850nm) and single-mode (1310nm) fiber technologies. This report details the project's current status, including the proof of concept, deliverables, and timescales for Phase 1. Key deliverables include tentatively defined specifications, prototypes, test benches, and preliminary testing results. The work plan outlines collaborations with industrial partners and highlights the need for radiation testing and component optimization to meet high-energy physics (HEP) requirements.

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  1. Versatile Link Status Report F. Vasey on behalf of the project steering board With input from C. Issever J. Troska J. Ye A. Prosser francois.vasey@cern.ch

  2. Versatile Link Project Description • Optical Physical layer linking front- to back-end • Bidirectional, ~5Gbps • Versatile • Multimode (850nm) and Singlemode (1310nm) versions • Point to Point and Point to Multipoint architectures • Phase 1: Proof of Concept based on tentative specifications francois.vasey@cern.ch

  3. oRx oRx oTx oRx oRx oTx oTx oRx oTx oTx oRx oRx oTx In detector oTx oRx splitter oTx oRx oRx oRx oRx oRx oTx oRx split split oTx oRx oRx In detector oTx In detector oTx Workpackage Allocation Project Management WP1.3 WP1.2 WP1.1 PON System BoBW P2P System SMU WP2.3 WP2.2 WP2.1 Front End Components Back End Components Passive Components PON PON Fibre split VTRx TRx HTx TRx MRx mux TRx CERN Fermilab Oxford francois.vasey@cern.ch

  4. Deliverables and TimescalesPhase 1: Proof of Concept based on tentative specifications • Deliverables: • a tentative specification based on past experience • a non-exhaustive portfolio of components meeting (even partially) the tentative specification (SM and MM, P2P and P2MP) • a front end TRx prototype package • test bench(es) for components and systems • preliminary irradiation test results • preliminary functionality test results for components and systems • a set of recommendations for phase 2. • Timescales: • 18 months for phase 1 (Sep 09) • Phase 2 to be defined after 12 months (Apr 09) • Phase 2: Feasibility Study • Detailed specifications based on user requirements • Components and Variants Shortlist • VTRx package definition and fabrication • Systems and Architectures Demonstration • Phase 3: Production • Specification freeze • Market Survey • Pre-Production • Qualification • Production francois.vasey@cern.ch

  5. Bi-directional Module with connector interface Based upon an acknowledged standard Work with Industrial partner early-on Low Mass & Volume Minimize material, avoid metals Non-magnetic, capable of operating in a magnetic field Requires replacement of ferrite bead used in laser bias network MM 850nm & SM 1310nm versions Work-plan Identified potential industrial partner Test commercial parts of the type we would like to customize (SFP+) Evaluated standard 850nm and 1310nm SFP+ modules in early 2008 Evaluated VCSEL-based 1310nm SFP+ modules in mid-2008 Customize package to meet HEP need Ask for CERN-specified parts to replace standard ones Laser Driver, TIA Laser (VCSEL or EEL), PIN photodiode WP2.1 status report, CERN a) VTRx Customisation VTRx

  6. b) Functionality Testing 1310nm VCSEL-based SFP+ @ 5Gb/s • Major effort has been put into evaluating commercial SFP/+/XFP transceiver modules • Functionality testing broken down into three parts • Power Consumption • Transmitter portion • Receiver portion • Testing of currently available modules has led to starting to define detailed performance specifications & methods • For details, see presentation by Luis Amaral < 600mW/module Magnetic-field tolerant bias-T @10Gb/s Further signal integrity improvements possible

  7. c) Radiation Testing SEU • Very Similar overall trend • ROSA (solid symbols) not much worse than bare PINs • Several orders of magnitude difference in response between devices • BER independent of Data-rate • Burst Errors observed • max. 10-bits long in PINs • max. 00’s bits long in ROSAs • Error correction mandatory • Plans: • Total Fluence testing of Laser, PINs and possibly TIAs and Laser Drivers in early 2009 Singlemode • 60MeV protons at PSI • Flux 108p/cm2/s (1-2 orders of magnitude above SLHC Tk/Pix) • Multiple device types from multiple Vendors, also with integrated TIA (ROSAs)

  8. WP2.3 status report, Oxford Fibre split mux a) Radiation tests of passive components • Irradiated up to 700 kGy • 4 multi-mode (MM) fibres @ 850nm • 1 single-mode (SM) fibre @ 1310nm (SMF28) • MM fused taper splitter • SM PLCC splitter • MM and SM LC-LC connectors • Preliminary results (details see T. Huffman’s talk) • 2 MM fibres and 1 SM fibre candidates • Survey of market for more MM fibres will continue • Need more splitter tests • Connector candidates identified • Overall: Very good progress made. francois.vasey@cern.ch

  9. MM fiber irradiation test Ericsson 1 Ericsson 3 Infinicor Ericsson 2 francois.vasey@cern.ch

  10. b) Tests of mechanical properties of fibres started • Until now un-irradiated SMF28 • Next test irradiated fibres francois.vasey@cern.ch

  11. c) Plans for the next six months • Continue market surveys • fibres • splitters • Prepare next gamma radiation test • fibres at low and high dose rates • Splitters passive tests • Setup environmental tests for fibres, splitters and connectors • Continue mechanical tests francois.vasey@cern.ch

  12. P2P oRx oTx oTx oRx In detector WP1.1 status report, SMU • Deliverables in phase 1: • Development of architecture demonstrators for P2P network on commercial transceivers. • Development of test bench(es) for components and systems • Development of test procedures. • The status: • SFP+ is chosen as candidate for Versatile Link standard (by Versatile Link group). • SFP+ carrier board has been designed and fabricated. With a loop-back (oTx to oRx via fiber) configuration, a 10 Gbps optical serial link has been demonstrated with AFBR-700SDZ (10Gb, 850 nm) from Avago. • Equipment is in place for 10 Gbps tests: • 12Gbps BERT. • 20GHz real-time scope with 8GHz differential probe. • O/E module with 12GHz bandwidth. • Sampling scope with 10GHz optical, 50 GHz electrical input modules. • New collaborator (IPAS) has been added to this work package. • The plan for the next 6 months: • With equipment in lab, and commercial transceivers, a full P2P network of 10 Gbps will be demonstrated. • With Stratix II GX programmed as the BERT (signal generator and bit error rate checker), a portable 6 Gbps test bench will be developed. • Tests will be carried out with the 12 Gbps BERT and with Stratix II GX based test bench. Testing procedures will be studied and defined through this process. francois.vasey@cern.ch

  13. The SFP+ carrier board for 10 Gbps signal Top Layer Bottom Layer Ground Layer Power Layer francois.vasey@cern.ch

  14. Preliminary test results 5 Gbps 3 Gbps • Eye diagram tests at 3, 5, 8 and 10 Gbps. • BER tests at 5 and 10 Gbps. BER is found to be bettet than 3E-14 at 10 Gbps. • The board works at 10 Gbps, but there are issues that needs more careful studies. 10 Gbps 8 Gbps Bathtub curve at 5 Gbps Bathtub curve at 10 Gbps francois.vasey@cern.ch

  15. WP2.2 status report, Fermilab PON PON TRx HTx TRx MRx • Fermilab Has Joined the Project • Work Plan Submitted and Approved • Presentation at Project Meeting (14-9-2008) • 3 Month Plan • Document and Communicate Test Strategy • Components • Procedures • Equipment • 6 Month Plan • Procure Samples of Selected Components • Test Lab Configuration • Begin Testing Following Documented Procedures TRx francois.vasey@cern.ch

  16. ConclusionPhase 1: Proof of Concept based on tentative specifications • Status after 6 months: • a tentative specification based on past experience • a non-exhaustive portfolio of components meeting (even partially) the tentative specification (SM and MM, P2P and P2MP) • a front end TRx prototype package • test bench(es) for components and systems • preliminary irradiation test results • preliminary functionality test results for components and systems • a set of recommendations for phase 2. francois.vasey@cern.ch