1. Teleconference notes, 21 July 2004 Jonathan King
IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise
Teleconference notes, 21 July 2004
Jonathan King
21 July 2004
IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise

2. Agenda 1) attendees 2) agree minutes of last meeting
3) review tasks and mechanisms, and define key outputs for September interim meeting (date tbd)
4) next meeting date/time
5) any other business
21 July 2004
IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise

3. 2) Minutes of last meeting agreed
1) Attendees
Jonathan King, Big Bear Networks
Piers Dawe, Agilent
Gary Schaulov, Rsoft
Matt Traverso, Opnext
Petre Popescu, Quake
John Dallesasse, Emcore
Yu Sun, Optium
Lars Thon, Aeluros
2) Minutes of last meeting agreed
21 July 2004
IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise

4. 3) Review of tasks and define key outputs
Review of time varying mechanisms (slide 5)
Review of tasks and next steps (slide 6)
21 July 2004
IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise

5. 3a) Review of time varying mechanisms
Connector offset:
static offset 3.5um average, 1.8um standard deviation for 50 micron fibre (i.e. 95% less than 7um). Do we need to scale for 62.5 micron fibre
connector offset may be a gearing factor; unlikely to be wiggled in a real service environment (more likely to see an exposed patchcord run perturbed by fan)
Fibre perturbation:
Fibre shaker may be necessary part of measurements may not be sufficient
May require a range of frequency and amplitude - 'perturbation mask'
large amplitude at low frequencies, smaller amplitude at higher frequencies
Laser wavelength
Rapid changes in laser wavelength result in modal noise; variance can be estimated using previous work - David Cunningham
Temperature
Petre Popescu agreed to model the evolution of channel characteristics as link and laser source temperature varied
21 July 2004
IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise

6. 3b) Review of tasks and next steps
Mechanisms: mechanical vibration rates - John Dallesasse (as 5b)
Experiment: relationship of perturbation spectrum to modal noise spectrum - Abhijit Phanse to check capacity for measurements at Scintera
Modeling:
Generate delay vs mode sets, and impulse responses for quasi-continuous perturbed link for selected launches, over Cambridge fibre set and 'standard link' - Yu Sun/Pete Hallemeier will present summary of work next meeting
Effect of temperature (link and source) - Petre Popescu will present summary of work to be performed next meeting
Modal noise: penalty for different laser types - David Cunningham
Real environments
Measurements of spectrum of time variation effects - volunteers tbd
What's already out there describing in-building environments - AINSI standard identified which may be pertinent; to be summarized by John Dallesasse and presented next meeting
'Standard link' for modeling: Straw-man standard link to be prepared for discussion next meeting - Jonathan King
21 July 2004
IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise

7. 4) Next meeting 5) Any other business
Wednesday 4th August 9am PCT, 5pm UK
5) Any other business
No issues raised
21 July 2004
IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise