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IEEE802.3aq Channel Model Ad Hoc Task: Time-Varying Study & Modal Noise Teleconference Notes, July 2004

Detailed notes from the IEEE802.3aq Channel Model Ad Hoc Task meeting discussing time-varying study and modal noise. Attendee list, review of tasks, mechanisms, and key outputs defined for the next meeting. Discussion on connector offset, fiber perturbation, laser wavelength, temperature effects, and more.

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IEEE802.3aq Channel Model Ad Hoc Task: Time-Varying Study & Modal Noise Teleconference Notes, July 2004

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

  3. 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 IEEE802.3aq Channel model ad hocTask 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) IEEE802.3aq Channel model ad hocTask 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 IEEE802.3aq Channel model ad hocTask 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 IEEE802.3aq Channel model ad hocTask 2: Time-varying study & modal noise

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

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