1. ACEOLE WP4 Status Report
Optical Transmission Systems for SLHC Experiments
Associated Partners:
Henrique Salgado INESC (P), Marco Van Ueffelen SCK.CEN (BE), Izzat Darwazeh UCL (UK), Pentti Karioja VTT (FI)
Researchers:
Sergio Silva, Sarah Seif el Nasr, Spyros Papadopoulos, Ioannis Papakonstantinou, Hans Versmissen
CERN Supervisors:
Jan Troska, Francois Vasey
01 October 2009

2. Project Timeline 01 October 2009 francois.vasey@cern.ch UCL INESC
VTT
01 October 2009

3. Optical links for Experiments
Upstream
Extract raw data from the detector, feed processing electronics situated in shielded and accessible area
Downstream
Distribute clock and control data
01 October 2009

4. Optical Link Components
Front End
Back End
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
Radiation Resistant
Bitrate determined by ASICs: 5 – 10 Gbps
COTS
10 Gbps FE BE
01 October 2009

5. Front End Transceiver, Versatile-TRx
J. Troska
CERN
Sergio
Hans
Sarah
GBTIA
ROSA
TOSA
GBLD
01 October 2009

6. Laser Modelling, Sergio
In order to aid the design of both the laser driver ASIC and the VTRx, a device and package model has been made and parameters extracted for several commercial laser diodes
Laser model coded in Verilog-A
To be used in GBLD re-design eval.
01 October 2009

7. In-house SFP+ PCB design, Sergio
Starting from a commercial LDD from Texas Instruments and using one of the obtained device/pkg models, we have designed an SFP footprint test board
PCB circuit simulations including the laser model were carried out to confirm the correct functionality of the board
Including optimization of the bias/matching network
PCB has just been submitted for fabrication
01 October 2009

8. Front-End TRx Testing, Hans
Test methods for evaluation of Transceivers in place, used routinely
Stable and well documented, having been successfully used by several new team members
Based on Laboratory instruments for eye diagram measurement and FPGA-based BERT for BER testing
Have tried several methods for comparison of large amounts of data from different transceivers
Settled on Radar/Spider plots for ease of visual interpretation
01 October 2009

9. TRx comparison, Hans
Comparison between open and closed modules shows very similar results
Will compare with space-grade TRx
Will evaluate thermal and EMI properties

10. Radiation Testing: neutrons, Sarah
Neutron Irradiation at Louvain-la-Neuve Cyclotron
Goal: first survey of optoelectronics sub-components for VTRX
Aim to go as high in fluence as possible to observe ultimate device limits if possible
Deuterons
50MeV Deuteron beam on Beryllium Target produces neutrons
Peak of energy distribution at 23MeV, mean ~16.6MeV

11. Front-End TRx Radiation test, Sarah
Carried out Total Fluence test to SLHC levels
20MeV neutrons at Louvain-la-Neuve Cyclotron, survey of a large number of devices (SM & MM)
Good first test that shows the way to future testing
No clear best candidates emerged, most likely to survey SLHC environment
Important to assess impact on overall system of using different device types
E.g. absolute responsivity pre-irradiation for PINs, forward voltage and its change in Lasers
Will carry out at end-09 SEU test at fluxes beyond SLHC
63MeV Protons at PSI, survey of a large number of devices (SM & MM)
01 October 2009

12. Optical Link Architectures
Point-to-Point
Ioannis
Spyros
Point-to-Multipoint
Passive Optical Network
01 October 2009

13. PON System Specifications, Ioannis and Spyros
Property (General)
PON Demonstrator
Clock rate
40 MHz (ie LHC clock rate 40.08MHz)
Max distance
Up to 1000m
Encoding | Target BER
NRZ 8b/10b | <10-12
Splitting ratio
>32 up to power budget allowed
Frame Format
Commands + Trigger
BW Allocation Algorithm
Statistical Multiplexing
Property (Down|Up)
Bit rate
1.6 Gb/s | 800 Mb/s
Latency
Fixed and Deterministic| To be determined
Received clock jitter
Able to drive a high-speed SERDES
01 October 2009

14. PON Demonstrator, Ioannis and Spyros
Our system is designed to support 64 slave nodes
Only 2 slave nodes are used in the first demonstration due to one FPGA platform and number of evaluation board available
However, all features of a PON can be demonstrated with this system
Both master and slaves are implemented on the same Virtex 5 platform
Both physical layer and medium access algorithm have been implemented
Master
Virtex 5
Slave1
Slave2
1km
splitters
01 October 2009

15. Project Deliverables 01 October 2009 francois.vasey@cern.ch UCL INESC
VTT
01 October 2009

16. Deliverables and Milestones#
Description
Month due
D411 Report on extendibility of PON concept to HEP
PASSIVE OPTICAL NETWORKS IN HIGH ENERGY PHYSICS EXPERIMENTS, I. Papakonstantinou, June 2009
D412 Conference report on demonstration of PON protocol for HEP application 24
D413 Documentation on hard, soft and firmware, system test results
D421 Report on laser electrical impedance measurements and models 6
LASERS ELECTRICAL IMPEDANCE MEASUREMENTS AND MODELS, S. Silva, Apr 2009
D422 Report on proposed matching networks, recommendations to designers and experimental results 12
MATCHING NETWORKS AND RECOMMENDATIONS TO DESIGNERS, S. Silva, Aug 2009
D431 Report on analysis of high fluence test data and proposed methodology 12
D432 Conference report on irradiation tests
D433 Conference report on irradiation and reliability tests
D441 Report on environmental, EMI and thermal impedance testing
D442 Conference report with comparisons between different module types 24
D443 Documentation on hard, soft and firmware, system test results
M 41 PON implementation in soft and hardware 9
PASSIVE OPTICAL NETWORKS IN PARTICLE PHYSICS EXPERIMENTS, I. Papakonstantinou, TWEPP Sep 2009
M 42 PON demonstrator with Versatile link components
M 43 Ready for irradiation testing
M 44 Ready for reliability testing
M 45 Ready to characterize
M 46 Ready to issue recommendations to package designers
W4n Optoelectronics working TWEPP workshop , 24, 36
TWEPP WORKSHOP, Sep 2009, Paris.
01 October 2009

17. Training by Visiting Scientists
15-16 June 2009
John Mitchell, UCL
The where, why and how of optical access
Under the bonnet of EPON, GPON and NG-PON
01 October 2009

18. Secondment Sergio Silva @ INESC Spyros Papadopoulos @ UCL
2-19 Dec 2008, 2-19 Mar 2009
Spyros UCL
26 Jan – 20 Mar 2009
Hans VTT
15 Oct – 11 Dec 2009
01 October 2009

19. Presentations at TWEPP-09
108 Passive Optical Networks in Particle Physics Experiments PAPAKONSTANTINOU, Ioannis
115 Characterization of Semiconductor Lasers for Radiation Hard High Speed Transceivers SILVA, Sergio
119 The Versatile Transceiver Proof of Concept TROSKA, Jan
01 October 2009

20. Credits
Jan Troska, Luis Amaral, Spyros Papadopoulos, Ioannis Papakonstantinou, Christophe Sigaud, Sergio Silva, Csaba Soos, Pavel Stejskal
Izzat Darwazeh, Pentti Karioja, John Mitchell, Henrique Salgado
Many others
01 October 2009