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ROD R&D Status

This document highlights the ongoing research and development of optical links for high-speed data transmission within ATCA Sub-ROD Injectors. The collaboration involves multiple institutions, including the University of Arizona and BNL, focusing on achieving operational speeds of 6.25 Gbps and beyond. Recent performance evaluations show Emcore and Reflex Photonics SNAP12 devices operating effectively at specified rates, with insights into design challenges like eye pattern degradation from vias. Future plans include integrating high-speed optical components and continued monthly meetings to share progress and coordinate efforts.

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ROD R&D Status

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  1. ROD R&D Status K. Johns, C. Armijo, J. Steinberg (U. Arizona) H. Chen, F. Lanni, J. Mead (BNL) L. Hervas (CERN) A. Meyer, A. Kielburg-Jeka, A. Straessner (Dresden) G. Perrot (LAPP) G. Blasetti, M. Citterio (INFN, Milano) D. Schamberger (SUNY, Stony Brook)

  2. Optical Link Notes • Currently we build with • Reflex Photonics SNAP12 • Emcore SNAP12 • Both specified @ 3.5 Gbps • Recent news/results • Delivery date for Reflex Photonics SNAP12 @ 6.25 Gbps still +6 weeks • First promised for July 1 • Both RP and Emcore 3.5 Gbps versions can run at higher speeds • Emcore shows better performance (up to 5 Gbps) based on measured BER

  3. Optical Link Notes • Designing @ 6.25 Gbps and beyond • Measurements with AZ test board

  4. Optical Link Notes • Designing @ 6.25 Gbps and beyond • Vias degrade eye pattern • No difference in trace length or layer

  5. Optical Link Notes • In order to move to higher optical density we are now designing with Reflex Photonics LightABLE OE • OSA is an IC with 12 channel GaAs VCSEL or 12 channel GaAs PIN photodetector • Connected electrically via wire bonds • Connected optically via MT connector • Present speed @ 6.25 Gbps • Designer provides an electrical footprint on the PCB • RP mounts (wirebonds) the OSA • OE part and mounting cost is ~$350 / die

  6. Optical Link Notes

  7. ATCA Sub-ROD Development (BNL)

  8. ATCA Sub-ROD Development • AdvancedTCA 8U Module • With separated +5V power connector and Gigabit Ethernet connector on front panel, it allows testing of main functions without ATCA crate • IPMI development is underway, received development document and source code from DESY. Even though we use different processor, all the code is in C which helps software porting • One module was shipped to Dresden in late June/early July • High Speed Parallel Optical Links and FPGA SERDES • Self loopback test works at 3.2Gbps on 12 channels, 40Gbps total bandwidth • Sub-ROD (and sub-ROD injector) still awaiting 75 Gbps transceiver from Reflex Photonics • Present plan is to do sub-ROD and sub-ROD injector integration tests in October using Emcore parts which can run over spec

  9. ATCA Sub-ROD Injector (AZ) • Sub-rod injector ATCA card also now available

  10. ATCA Sub-ROD Injector (AZ) • Testing with test ATCA backplane

  11. ATCA Sub-ROD Injector (AZ) • Details of test backplane

  12. ATCA Sub-ROD Injector (AZ) • Eventual testing in ATCA crate

  13. ROD in ATCA/AMC Form Factor • Present plan is to build processing units (ROD or ROD injectors) in AMC format on ATCA cards • ROBs would also reside in ATCA crate

  14. ROD in ATCA/AMC Form Factor • AMC cards are Processing Units • Contain optical receivers and FPGA based SERDES • Perform energy calculations and partial Level-1 sums • High speed, low latency connections for Level-1 sums require communication between AMC modules and possibly between different ATCA carriers • Processing units can be developed independently of ATCA carrier board (using MicroTCA crate) • ATCA Carrier Board • Provides connections between AMC modules and also to ATCA backplane • Low latency switching protocol • Possible connection to ROB via 10G Ethernet • Provides connections to rear transition board for Level-1 sums

  15. AMC Card using LOB • 4 x 12 channels per AMC card • Stratix IV has 48 transceiver channels @ 8.5 Gbps • 4 AMC cards per ATCA (ROD)

  16. AMC Card using LOB • 4 x 12 channels per AMC card • Stratix IV has 48 transceiver channels @ 8.5 Gbps • 4 AMC cards per ATCA (ROD)

  17. ATCA/AMC Form Factor • Working plan is to build ROD (and ROS) cards on ATCA cards • ROD receive modules in AMC format • ROD injector transmit modules in AMC format • ATCA sub-ROD already exists (BNL) • ATCA sub-ROD injector now exists (AZ) • ATCA sub-ROD injector can also be used to hold sub-ROD injector AMC card

  18. sLHC LAr ROD Upgrade R&D • Mailing list • slhc-atlas-lar-rod@cern.ch • CERN espace • https://espace.cern.ch/slhc-atlas-lar-rod • Phone meeting • First meeting was organized on Sept. 11th, people from Univ. of Arizona, BNL, Dresden, LAPP and Stony Brook Univ. were connected • Goal was to update what everybody’s been working on and discuss how to proceed • Plan to continue this phone meeting once a month

  19. Optical Link Notes • Designing @ 6.25 Gbps and beyond • Hyperlynx SI software • Good for impedance estimation • Less useful eye patterns (2.5 - 6 GHz below)

  20. ATCA Sub-ROD Injector (AZ) • Eventual testing in ATCA crate

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