High Data Rate Optical Links for HEP Annie Xiang (SMU)/Alan G. Prosser (FNAL) Fermilab Detector R&D Program Review 29 October 2014
High Data Rate Links for Collider Experiments (CDRD) • Integrated Optical Modulators “to investigate and develop two alternative modulation methods that are based on indirect modulation of the optical signal and are applicable to longer wavelengths (Mach-Zehnder and Electro Absorption Modulators)” Collaborators: Argonne (evaluation and radiation testing of MZ, EAM modulators) University of Minnesota (development of BaSrTiO 3 MZ modulator) • 120 Gbps Parallel Links “to develop a parallel optical transmitter to support the deployment of a low mass 120 Gbps data links based on industry standards” Collaborators: Fermilab (component identification and procurement; pursue partnerships with industry) Southern Methodist University (see this presentation for ATx development) Ohio State University (rad-hard laser driver array development) 2 A. Xiang/A. Prosser | High Data Rate Optical Links for HEP 10/28/2014
Versatile Link Common Project Collaborating Institutions Performance Measurements Optical Modulation Amplitude 1400 Work Package 1.1 (Southern Methodist University) CXP_2T CXP_3G 1200 Point to Point Architecture and System Engineering BOA_X3 Work Package 2.1 (CERN) 1000 BOA_X9 WL013 Front End Components (Versatile Transceiver) m W 800 WLDev2 Work Package 2.2 (Fermilab) 600 MP_S MP_N Back End Components (COTS, Off Detector Components) 400 PPod Tx 593 Work Package 2.3 (Oxford University) Spec (Calorimeter) 200 Spec (Tracker) Passive Components 0 1 2 3 4 5 6 7 8 9 10 11 12 Device Channel Number Project Documentation Parallel Optics Transmitter Radar Plot OMA 8 7 2 6 1/DJ_Tx(min) Ext_R 5 4 2 8 3 2 1 0 1/TJ_Tx(min) Eye 2 1.6 Measurement Norm OMA -1.6 dBm* Ext. Ratio 3.0 dB Tx. Eye Opening 60% of OMA Tx Rise Time 70 ps Tx Fall Time 70 ps 4 4.3 Tx Total Jitter 0.25 of UI Tx Deterministic Jitter 0.12 of UI 1/Fall 1/Rise *Tracker Grade Spec Comparative Analysis 3 A. Xiang/A. Prosser | High Data Rate Optical Links for HEP 10/28/2014
SMU Work On CDRD Links Project Proposed to study for solutions of single channel and parallel optical transmitters that reach 10 Gbps per fiber or 120 Gbps in a 12-way fiber ribbon. Although this is a study at component/module level, we need the whole system for testing, in that we work with the FNAL group which is the expert of the optical link receiving side or the “back - end”. The FNAL group also works with SMU on parts identification and procurement. Together we narrow down to two options: the LC TOSA based single channel transmitter MTx and the MOI/Prizm based array transmitter ATx. Piggyback on the R&D projects for LHC upgrades, we also developed the array VCSEL driver based on a commercial 0.25 μm Silicon -on-Sapphire CMOS technology. This development will provide the driver for ATx and also for optical transmitters that will be developed in the VL+ project. 4 A. Xiang/A. Prosser | High Data Rate Optical Links for HEP 10/28/2014
SMU Miniature Optical Transmitter (MTx) MTx: custom latch to achieve fiber/VCSEL coupling, based on industrial standard LC TOSA and fiber connector; with SOS based VCSEL driver ASIC, achieved 10 Gbps per fiber data transmission for HEP detector front-end environment. Thinner, less material than the SFP+ industrial module. mm 6.3 Custom latch design by graduate student Measures up to 10 Gbps per fiber. The production modules will be used in ATLAS LAr and nSW upgrades. 5 A. Xiang/A. Prosser | High Data Rate Optical Links for HEP 10/28/2014
SMU Array Optical Transmitter (ATx) Developed an active optical light coupling method using industrial standard parts (the MOI and the Prizm fiber ribbon connector) to achieve a uniform coupling of an array of 12 VCSELs with a 12-way fiber ribbon, paving the road for development of optical transmitters that will meet the special requirements in HEP. 4-D active optical coupling stage for MOI/Prizm. It takes up to 15 min for one attachment. Will automate the procedure. 6 A. Xiang/A. Prosser | High Data Rate Optical Links for HEP 10/28/2014
SMU Array VCSEL Driver (LOCld4) Taking advantage of ASIC developments for LHC upgrades, and the knowledge in VCSEL drivers, we developed a 4-lane VCSEL driver, using the open-drain technique, to fit in the required 250 μm pitch and to improve driving efficiency; unique in HEP. Prototyped and tested in 2013/2014 Will be prototyped in Dec. 2014 and tested in 2015. This will be a key contribution to the VL+ project 7 A. Xiang/A. Prosser | High Data Rate Optical Links for HEP 10/28/2014
SMU Work On Versatile Link Common Project The Versatile Link is a common project of ATLAS and CMS to develop the optical physical layer for the GBT based data links. Successfully developed bi-directional/configurable single mode or multi-mode data links operating at 4.8 Gbps and resistant to calorimeter grade radiation levels. On the US side, FNAL and SMU worked together on system specification and on many tests, including once a test that SMU people travel to FNAL to use its environmental chamber and other test facility on an optical transmitter candidate. This project is complete. The Versatile Link Project 8 A. Xiang/A. Prosser | High Data Rate Optical Links for HEP 10/28/2014
SMU Work Planned for Versatile Link + Common Project The kick-off meeting of Versatile Link+ was held during TWEPP2014 at Aix en Provence. VL+ will emphasize development of array optics. Document about work packages is being drafted. SMU plans to continue its very productive collaboration with FNAL on the development of array VCSEL drivers and array optical transmitters. 9 A. Xiang/A. Prosser | High Data Rate Optical Links for HEP 10/28/2014
Industry Trends in High Data Rate Optical Links 12 channel Tx or Rx 120 Gbps (10 Gbps/channel) Mid-board mountable Reflow technology Image courtesy of Avago Technologies 10 A. Xiang/A. Prosser | High Data Rate Optical Links for HEP 10/28/2014
Evaluation of COTS Components 12 channel Tx Array for Multi-Mode Fiber 12 channel Rx Array for Single Mode Fiber 120 Gbps (10 Gbps/channel) 120 Gbps (10 Gbps/channel) l = 1310 nm GUI for Eval Board Vendor Supplied Evaluation Board Vendor Supplied Evaluation Board FNAL Designed Evaluation Board (4 Channel TRx @ 6.25 Gbps) 11 A. Xiang/A. Prosser | High Data Rate Optical Links for HEP 10/28/2014
GigaBit Link Interface Board (GLIB) Ecosystem Components Avago MiniPod Mezzanine Card VTTx/VTRx Mezzanine Card Meg-Array Socket HPC FMC Accepts Tx and Rx with FMC Connection (backside of board) VTRx Transceiver VTTx Twin Transmitter GLIB v3 (P. Vichoudis, CERN) 12 A. Xiang/A. Prosser | High Data Rate Optical Links for HEP 10/28/2014
Test and Measurement Facilities Labview VIs (Histogram Analysis) Digital Signal Analyzer (Eye Patterns, Jitter) Eye Pattern Measurements 1: P his_pk, upper - - - - - - Optical Modulation Amplitude 2: P his_pk, lower - - - - - - 1 2 Variable Optical Attenuators (Receiver Sensitivity) BERTScope BSA12500B (BER Testing) Environmental Chamber (Temperature/humidity test) 13 A. Xiang/A. Prosser | High Data Rate Optical Links for HEP 10/28/2014
Collaborations with Industry • VegaWave Systems • Developed optical link requirements for layer to layer signalling (ANL, Fermilab) • Provided test platform for LiNbO 3 COTS Mach-Zehnder Modulator • Reflex Photonics • Provided evaluation hardware and performance testing of early optical engine (4 Channel, TRx, 6.25 Gbps) • Exploring possible use of SMU rad-hard ASICs in Reflex 12 channel optical engine (Tx) 14 A. Xiang/A. Prosser | High Data Rate Optical Links for HEP 10/28/2014
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