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Task 2 update: Time variation and modal noise study

Task 2 update: Time variation and modal noise study. Task 2 Progress. To date: 'Standard link' for modeling and experiments agreed 4 connectors with 2 connectors at 7micron offset (worst case consistent with preceding standards and existing link specs)

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Task 2 update: Time variation and modal noise study

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  1. Task 2 update: Time variation and modal noise study IEEE802.3aq Channel model ad hocTask 2: Time variation and modal noise

  2. Task 2 Progress To date: • 'Standard link' for modeling and experiments agreed • 4 connectors with 2 connectors at 7micron offset (worst case consistent with preceding standards and existing link specs) • Adopted GR-63-CORE describing in-building environments • office environment vibration tests at 'constant acceleration' (0.1G & 1G) from 5-100 Hz (vibration amplitude ~ 1/f2) Active: • Experiments to determine relationship of perturbation spectrum to modal noise spectrum just started. Initial experiments at 10-100Hz, 3-5mm p-p movement • up to 3x frequency multiplication observed • Study of temperature effects in progress • Comprehensive list of mechanisms compiled and size of each effect being determined. Most significant effects will be for further study • Modal Noise calculations in progress • not likely to be ready for September interim IEEE802.3aq Channel model ad hocTask 2: Time variation and modal noise

  3. Standard link: Agreed worst-case test configuration for channel variance measurements from '62 MMF con loss and draft worst case configuration' - David Cunningham IEEE802.3aq Channel model ad hocTask 2: Time variation and modal noise

  4. Vibration tests representative of office environment • GR 63 CORE • describes office environment vibration tests at 'constant acceleration' (0.1G & 1G) from 5-100 Hz • (vibration amplitude ~ 1/f2 ) • Perturbation to be applied to 10m fibre loop prior to main MM fibre • 0.1G acceleration at 1Hz corresponds to a 2.5cm perturbation amplitude - similar to TIA/EIA-455-203 fibre shaker • 1G acceleration at 1Hz corresponds to 25cm amplitude - similar to 'shaking the fibre' from summary of GR-63-CORE in 'LRM080404' - John Dellasasse IEEE802.3aq Channel model ad hocTask 2: Time variation and modal noise

  5. Summary table of temperature variation impact from Sept 15th rev of 'Temperature variation' - Petre Popescu IEEE802.3aq Channel model ad hocTask 2: Time variation and modal noise

  6. Experimental study of channel variation vs perturbation frequency • Experimental test set up and intitial results are described in document: 'TimevarianceinMMFlinks-initialtestresults' - Robert Coenen IEEE802.3aq Channel model ad hocTask 2: Time variation and modal noise

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