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Re: [10GMMF] Task 2 and 4 slides for Dec15th - OM3 fibre measurements




Joerg,
thanks for the confirmation and clarification.  

Regarding the EF at 30%, if the radial limit is a small as 6 um, then singlemode launches offset by as little as 8 um would be allowed.  Launches in this range have been shown by John Ewen this week to produce the largest PIE-D in OM1 fibers, with values about 0.7 dB higher than those for 20 um offset launches.   So a spec this loose seems considerably sub-optimal.

Regards,
Paul Kolesar
SYSTIMAX« SOLUTIONS
1300 East Lookout Drive
Richardson, TX 75082
Phone:  972.792.3155
Fax:      972.792.3111
eMail:   pkolesar@systimax.com



"Joerg-R. Kropp" <Joerg.Kropp@INFINEON.COM>
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Re: [10GMMF] Task 2 and 4 slides for Dec15th - OM3 fibre measurements





Paul,
you are correct! The Bandwidth diagram is scaled for a length of 300m of a 1300nm transmission. It is just the bandwidth which results from the pulse forms over the 300m length (large diagram on each slide). In addition to that bandwidth dependence on the offset radius of the launch I included the calculated OFL bandwidth of the fiber by a straight line in order to give some additional information.
 
A statement to the EFD values:
I agree that the lower borders for OM1 and OM2 offset launch should be adjusted to the same value in order to get no difference between both, my favorite for that is < 30% for EFD at 6Ám.
The reason of the definition of the center border is to avoid to large power in the central region because of the possible dip in the center of the fiber. Since this dip is in general of the same size for OM1 and OM2 fibers it makes no sense to define different values for the EFD borders in that area.
 
Joerg
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Re: [10GMMF] Task 2 and 4 slides for Dec15th - OM3 fibre measurements


Joerg,

I believe I've answered my first question.  The OFL line is the raw OFL BW at 1300 nm not normalized to GHz-km, simply GHz.  The value is 0.5GHz-km/0.3km = 1.67GHz.  Correct?


Paul



Paul Kolesar <PKOLESAR@SYSTIMAX.COM>
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Joerg,

In your and Stefano's contribution to Task2/4  this week you provide bandwidth plots on the right side of three slides showing the trend with offset.  I have two questions:

1. In each of these there is a horizontal line at about 1.6 GHz-km that appears to be labeled OFL.  Is this the OFL BW at 850 nm?  

2. The horizontal axis is labeled "radius of launch (um)".  This can be interpeted in two ways.  Is it the encircled flux radius at perhaps 86% level, or (more likely) the offset radius of the launch?


Thanks in advance for the clarifications.


Paul Kolesar


"Joerg-R. Kropp" <Joerg.Kropp@INFINEON.COM>
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Re: [10GMMF] Task 2 and 4 slides for Dec15th - OM3 fibre measurements









Jonathan and all,

please find enclosed further simulations about the OM3 transmission and our proposal based on that simulations.

I hope it will be possible to discuss that today.
I have to cut the presentation into two because of the 100k limit.


Joerg-R. Kropp

 

Infineon Technologies Fiber Optics GmbH
MOD CE

Dr. Joerg-R. Kropp

Senior Staff Expert

Wernerwerkdamm 16

D-13629 Berlin / Germany

Phone -49-30-85400-4918

Fax     -49-30-85400-4900

Mail     joerg.kropp@infineon.com



[attachment "OM3 Fiber EFD PIED1.pdf" deleted by Paul F Kolesar/CommScope]