1. 4 Aug 2004IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise 1 Teleconference notes, 4 August 2004 Jonathan King

2. 4 Aug 2004IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise 2 Agenda 1)attendees 2)agree minutes of last meeting 3) a)Summary of AINSI document describing basic tests and measurements simulating field environment - John Dallesasse, Emcore b)Measurement of time variance in MMF - Robert Coenen, Scintera c)Summary of polarization induced time variation in MMF - Yu Sun, Optium d)Summary of planned modeling of link and source temperature dependence - Petre Popescu, Quake e)Strawman standard link proposal - Jonathan King, Big Bear Networks 4)next meeting date/time 5)any other business

3. 4 Aug 2004IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise 3 1) Attendees Jonathan King, Big Bear Networks Piers Dawe, Agilent David Cunningham, Agilent Petre Popescu, Quake Petar Pepeljugoski, IBM John Dallesasse, Emcore Yu Sun, Optium Pete Hallemeier, Optium Joerg Kropp, Infineon Jesper Hanberg, Intel Andre Van Scheinel, Bookham Lars Thon, Aeluros Robert Coenen, Scintera John Jaeger, Big Bear Networks Tremant Maio, Analogue others ? 2) Minutes of last meeting - no issues raised

4. 4 Aug 2004IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise 4 3) Presentations a) and b) presentations from John Dallesasse and Robert Coenen postponed to next meeting (slides didn't get through to reflector). c) Summary of polarization induced time variation in MMF - Yu Sun Discussion following: Connector loss needs to be included; may need two link model scenarios - one with mode selective loss (MSL) and one without. Several participants have observed polarisation induced impulse response changes to occur without mode selective loss. Standard modal noise treatment may describe both lossy and non-lossy cases. d) Summary of planned modeling of link & source temperature dependence - Petre Popescu Discussion following: Fibre temperature changes are not expected to produce large or fast changes in modal delays; does change modal power distribution due to phase change between overlapping modes. Largest contribution will come from temperature induced source wavelength changes, which result in polarisation evolution and modal power distribution in the fibre. Petre' will supply a 1 page description of planned modeling for the next meeting. e) Strawman standard link proposal - Jonathan King Discussion following: Suggested additions to 'standard link' were: Add fibre shaker position to diagram; Add OFL loss and probability for each connector. There was support for a simpler 3 connector link, since for the same likelyhood of occurrence, the effect on path penalty of 2 connectors with large offsets would be worse than a larger number of connectors with smaller offsets.

5. 4 Aug 2004IEEE802.3aq Channel model ad hoc Task 2: Time-varying study & modal noise 5 4) Next meeting Wednesday 11th August 9am PCT, 5pm UK 5) Any other business No issues raised