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Re: [10GMMF] the minutes of task4 Nov. 8th meeting

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Stefano and all,
thank you for the comment, but the statement reads:    "linear polarization is lost"
That war reported byDavid.  It is not possible to detect a polarization with a single polarizer, in other words that there is no linear polarization left!
The explaination may be as follows (which was not discussed in detail in the telco):
The linear polarization of the launch is turned into circular polarization because of the birefringence (which is caused by the mechanical stress in the fiber) after some meter of fiber. This circular polarization will be existent in some modifications even over a long piece of fiber and therefore you can influence the signal on longer fiber pieces (That observation was already stated by David).
This result is similar to our observations. We tested transmission even with circular polarized launch and the result was that we see similar effects as with linear polarization. That fits completely with the explaination above. 
-----Original Message-----
From: owner-stds-802-3-10gmmf@IEEE.ORG [mailto:owner-stds-802-3-10gmmf@IEEE.ORG] On Behalf Of Bottacchi Stefano (IFFO MOD CE external)
Sent: Mittwoch, 10. November 2004 18:38
Subject: Re: [10GMMF] the minutes of task4 Nov. 8th meeting
Importance: High

Dear Yu,
thank you for task 4 meeting minute. I have one question regarding the conclusion of loosing the input polarization information after about 3m (point 1). Since we experienced sensible pulse changes starting from 150~200m due to input linear polarization orientation, and assuming loosing input state after 3m, my conclusion would be that the pulse changes should be determined in the launching offset section, in the very first few meters. but why we never measured pulse distortion before then at least 100 meters? Stated in a different way, we can manage input polarization state and we see its effect on pulse shape after at least 100 meters or more. This means polarization should be conserved for at least such  a distance otherwise the pulse distortion would be a random variable, not related to the input polarization state, and this is NOT the case.
Best regards
-----Original Message-----
From: owner-stds-802-3-10gmmf@IEEE.ORG [mailto:owner-stds-802-3-10gmmf@IEEE.ORG] On Behalf Of Yu Sun
Sent: Mittwoch, 10. November 2004 18:02
Subject: [10GMMF] the minutes of task4 Nov. 8th meeting

Dear Colleagues,


I attached the minutes of task 4 last call. I would appreciate your comments.


Best regards,