High Data Rate Optical Links for HEP Annie Xiang (SMU)/Alan G. - - PowerPoint PPT Presentation

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)

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• 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 BaSrTiO3 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)

Device Channel Number mW

200 400 600 800 1000 1200 1400 1 2 3 4 5 6 7 8 9 10 11 12

Optical Modulation Amplitude

CXP_2T CXP_3G BOA_X3 BOA_X9 WL013 WLDev2 MP_S MP_N PPod Tx 593 Spec (Calorimeter) Spec (Tracker)

Versatile Link Common Project

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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 Tx Total Jitter 0.25 of UI Tx Deterministic Jitter 0.12 of UI *Tracker Grade Spec 2 2 1.6 4.3 4 2 8

Parallel Optics Transmitter Radar Plot

1 2 3 4 5 6 7 8

OMA Ext_R Eye 1/Rise 1/Fall 1/TJ_Tx(min) 1/DJ_Tx(min)

Comparative Analysis

Work Package 1.1 (Southern Methodist University) Point to Point Architecture and System Engineering Work Package 2.1 (CERN) Front End Components (Versatile Transceiver) Work Package 2.2 (Fermilab) Back End Components (COTS, Off Detector Components) Work Package 2.3 (Oxford University) Passive Components

Collaborating Institutions Performance Measurements Project Documentation

SMU Work On CDRD Links Project

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• 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

• f 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.

SMU Miniature Optical Transmitter (MTx)

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 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.

6.3 mm

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.

SMU Array Optical Transmitter (ATx)

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 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.

SMU Array VCSEL Driver (LOCld4)

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 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

SMU Work On Versatile Link Common Project

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 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

• perating 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

• ther test facility on an optical transmitter candidate.

 This project is complete.

The Versatile Link Project

SMU Work Planned for Versatile Link + Common Project

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 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.

Industry Trends in High Data Rate Optical Links

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12 channel Tx or Rx 120 Gbps (10 Gbps/channel) Mid-board mountable Reflow technology Image courtesy of Avago Technologies

Evaluation of COTS Components

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12 channel Rx Array for Single Mode Fiber 120 Gbps (10 Gbps/channel) l = 1310 nm Vendor Supplied Evaluation Board 12 channel Tx Array for Multi-Mode Fiber 120 Gbps (10 Gbps/channel) GUI for Eval Board Vendor Supplied Evaluation Board FNAL Designed Evaluation Board (4 Channel TRx @ 6.25 Gbps)

GigaBit Link Interface Board (GLIB) Ecosystem Components

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VTTx/VTRx Mezzanine Card VTTx Twin Transmitter VTRx Transceiver Avago MiniPod Mezzanine Card Accepts Tx and Rx with FMC Connection (backside of board) GLIB v3 (P. Vichoudis, CERN) Meg-Array Socket HPC FMC

Test and Measurement Facilities

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Digital Signal Analyzer (Eye Patterns, Jitter) Labview VIs (Histogram Analysis) Variable Optical Attenuators (Receiver Sensitivity)

1: Phis_pk, upper - - - - - - 2: Phis_pk, lower - - - - - -

Eye Pattern Measurements Optical Modulation Amplitude

BERTScope BSA12500B (BER Testing) Environmental Chamber (Temperature/humidity test)

Collaborations with Industry

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• VegaWave Systems
• Developed optical link requirements for layer to layer signalling (ANL,

Fermilab)

• Provided test platform for LiNbO3 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
• ptical engine (Tx)