1. 1 Preparation to test the Versatile Link in a point to point configuration 1.Versatile Link WP 1.1: test the Versatile Link in a point to point (p2p) configuration. 2.Reference Link: a common hardware platform to perform tests for optical link systems and components. SMU + IPAS

2. J. Ye, Dept. of Phys. Versatile Link Project meeting, Naxos 9.14.2008 2 Versatile Link WP1.1 The goal: To test the Versatile Link in a point to point (p2p) configuration The status: SFP+ carrier board fabricated and tested to 10Gbps. Equipment in place. 0.5 – 12 Gbps BERT. 20GHz real-time scope with 8GHz differential probe. Analog O/E module with 12GHz bandwidth. Sampling scope with 10GHz optical, 50 GHz electrical input modules. The plan: More tests with the SFP+ carrier board with SFP+ modules from different vendors. Follow the test procedure listed in subgroup C (when applicable) and generate a document for discussion about the P2P test procedure and evaluation critiera. Conduct the tests when VL modules become available. P2P Configuration oTx oRx oTx oRx In detector WP1.1: Architecture Interfaces Test procedures Test systems Tests

3. J. Ye, Dept. of Phys. Versatile Link Project meeting, Naxos 9.14.2008 3 The SFP+ carrier board layout Top Layer Bottom Layer Ground Layer Power Layer

4. J. Ye, Dept. of Phys. Versatile Link Project meeting, Naxos 9.14.2008 4 Preliminary test results Eye diagram tests at 3, 5, 8 and 10 Gbps. The setup: Signal generator: the 12G BERT Module under test: AFBR-700SDZ (10Gb, 850 nm) from Avago. A short fiber is used to loop the optical signal from TX to Rx. The Scope: 20GHz real-time w/ the 8GHz differential probe. Measurement carried out at the RX of the SFP+. In the future, a sampling scope with higher bandwidth will be used and measurements will also be carried out at the TX of the SFP+. The conclusion: this board works up to 10 Gbps.

5. J. Ye, Dept. of Phys. Versatile Link Project meeting, Naxos 9.14.2008 5 Test equipment BERT Real-time scope sampling scope

6. J. Ye, Dept. of Phys. Versatile Link Project meeting, Naxos 9.14.2008 6 Eye diagrams 3 Gbps 8 Gbps 10 Gbps 5 Gbps The 8 GHz probe bandwidth is not suitable for measurement of 8 Gbps and above.

7. J. Ye, Dept. of Phys. Versatile Link Project meeting, Naxos 9.14.2008 7 Bit Error Rate at 5 Gbps

8. J. Ye, Dept. of Phys. Versatile Link Project meeting, Naxos 9.14.2008 8 Bit Error Rate at 10 Gbps The BER at 10 Gbps is better than 3E-14: no error for more than 1 hr.

9. J. Ye, Dept. of Phys. Versatile Link Project meeting, Naxos 9.14.2008 9 Summary on WP 1.1 With this setup (BERT + the SFP+ carrier board), the hardware is ready to carry out WP1.1. More tests will follow to generate a test procedure. Will bring up the Stratix II GX evaluation board and use it in the place of the BERT. This way, the setup may be used for irradiation tests of the Versatile Link module. Will get ready to measure the Versatile Link module. According to the proposal, we are doing fine. 0.5 FET is required for WP1.1 phase 1, 1.5 FET for phase 2 and 3. So far there is no hope from the US funding agencies to fund the Versatile Link activities, although we have been telling people that we plan to use it in many places. We have been trying to be creative (there is a Chinese saying that even the best wife cannot make a dinner out of nothing) and get the project moving. Any suggestions from the Versatile Link management group?

10. J. Ye, Dept. of Phys. Versatile Link Project meeting, Naxos 9.14.2008 10 The Reference Link Meeting at SMU with OSH and UMN Dec. 2007 as a kick-off to this project. Proposals on the reference link have been submitted to CMS and ATLAS. The response from ATLAS is that if this is discussed in the joint opto- electronics working group, then we should go ahead with it. It has been decided to start with Stratix II GX and its evaluation board has been purchased by SMU. OSU provided its test-box and it provides a lot of information on the optical power measurements.

11. J. Ye, Dept. of Phys. Versatile Link Project meeting, Naxos 9.14.2008 11 The Reference Link block diagram FPGA based multi-channel ser-des from 0.6 Gb to 6 Gb. This FPGA also functions as a BERT, DAQ and computer interface SFP+ carrier board. Ref.Link project may provide help on component identification for a custom pluggable model PCB. Multi-channel optical power source and detection for fibers Experimental environment monitoring (T, RH, etc) Multi-channel linearly regulated DC power supply with current monitoring ADC + linear switch computer Ethernet or USB?

12. J. Ye, Dept. of Phys. Versatile Link Project meeting, Naxos 9.14.2008 12 The Reference Link parts identification FPGA: Stratix II GX. Start from its eval-board. Optical light source: VCSEL at 850 nm. Optical power measurement: OPT101 from Burr- Brown. 2.3×2.3 mm 2 photodiode + TIA. Dynamic range: 0.01 μw to a few mW. Can easily package into a ST connector. Current monitoring chip.

13. J. Ye, Dept. of Phys. Versatile Link Project meeting, Naxos 9.14.2008 13 Status and plan Most components identified or under tests and closed to be chosen. Annie Xiang agrees to bring up the Stratix II GX eval-board, and design the PCBs for the reference link. She designed the SFP+ board. Annie is responsible for the demo-links, a project in the US- ATLAS ID upgrade. She just finished the GOL based demo-link and that has been successfully integrated into the test stave readout at LBNL. The LOC and/or GBTx based demo-links will use the reference link as the receiver part. IPAS has agreed to provide support on PCB fab. + assembly. The plan: Stratix II GX evaluation board + SFP+ carrier board with the existing code: by the end of 2008. A detailed design document will be generated and the design of various boards starts in the spring of 2009. The current hope is that the first prototype of the reference link be available in the fall of 2009. This plan does not follow what we put in the reference link proposal to ATLAS and CMS, but we are really limited by resources and manpower.