15 dec 2004ieee802.3aq channel model ad hoc task 2: time-varying study & modal noise 1...

15 Dec 2004 IEEE802.3aq Channel model ad hocTask 2: Time-varying study & modal noise

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

Teleconference notes, 5Jan, 2005


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Agenda

1) Attendees2) Agree last meetings minutes3) Task 2

a) no agenda items

4) Launch study, joint task 2 & task 4a) OM3 measurements, Lew Aronsonb) Vortex launch, Jim Morris ( Jim will give the talk on next call,

Jan 12th)

5) other business 6) next meeting date/time


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1) Attendees

• Ali Ghiasi, BroadCom• John Jaeger, Big Bear Networks• Jim Morris, DOC• Lew Aronson, Finisar• Joerg Kropp, Infinion• Yu Sun, Optium• Pete Hallemeier, Optium• Al Brunsting, Panduit• Petre Popescu, Quake• Paul Kolesar, Systimax


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2) Last meetings minutes agreedNo issues raised

3) Task 2 - no agenda items


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4) Launch study, joint activity task 2 & 4

a)IPR/PIE measurements on OM1 and OM2, offset, center and vortex launches

– Lew Aronson

Commentary on OM1 Measurements (relative PIE-D)

1.Center Launch Generally Best Choice Without Connectors, ignoring other issues (e.g. polarization)

2. Offset and Vortex Launch Generally Vary Less with Connectors

3. Vortex Compares Favorably to Offset Launch in Virtually All Cases

4.Examination of Impulse Responses (following pages) suggests Vortex Launch is Particularly

Commentary on OM3 Measurements (relative PIE-D)

1. Center Launch Best for No Connectors and Intermediate (two 4 um offset) Connector

Case.

2. Offset Launch (50/125 MCP) Results in Worst PIE-D Values with Worst Connectors

(two 7 um)

3. Single Vortex Launch Usually Better than Offset Launch

4. Vortex Launch Has Significantly Different IPR Shape than Offset– Worst Vortex

Values compare favorably to the worst center launch cases


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4) Task 2 & 4: joint activity on launch study - 2Conclusions

• Vortex Launch Performs Equal to or Better than Offset Launch in Most All Cases.

• Single Mode Center Launch is Clearly Best for OM3

• Offset Launch (at least standard 50 um MCP) is Probably Unacceptable for OM3

• Vortex Launch for OM3 is Not As Good as Center Launch But May Be Good Enough

• Of the Launches Tested, Vortex Launch Appears the Best for a Single Integrated Launch

for both OM1 and OM3, and May Be Good Enough to Meet Needs

• Care Should Be Taken Before Ruling Out the Vortex Launch As An Alternative for OM3

• More Work is Needed on Experimental Verification of Vortex Tolerance Issues and

• Sensitivity to Polarization / Manipulation

Discussions:

1. The dependency of the radium of the ring of Vortex launch

Vortex launch is not as sensitive to the ring radium as to its phase function. When the radius changes a relatively large range, the change of PIE is small

2. The sensitivity of the alignment of Vortex lens to the fiber

The worst case misalignment can be from 5 to 7 um

3. The study of Vortex launch has not covered the OM2 fiber yet, since the fiber set of OM2 is not available.


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4) Task 2 & 4: joint activity on launch study - 3

Discussions con’t:

4. The output intensity distribution of Vortex launch used in measurement shows several low intensity rings. They are due to the lens design and are possible to be further optimized.

Highlights:

The experimental result of encircle flux is in need. Encircle flux analysis software is highly appreciated.

Please contact

Lew Aronson ([email protected])


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5) Next meeting

• Wednesday 12th January 2005 9.30am PST

4) Other business - no issues raised

15 dec 2004ieee802.3aq channel model ad hoc task 2: time-varying study & modal noise 1...

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