Re: [10GMMF] Next task 2 meet - paper on Modal Noise on Aerial fibres - plus an experiment proposal
Johnathan,
I have sent a document on our most recent test results on channel
variations to Piers to be uploaded to the IEEE web site.
Using the set-up proposed by David Cunningham, a shaker vibrating the
fiber at a deflection set by GR-63 CORE over a range of frequencies, I
have estimated the maximum channel variation frequency to be about 40
Hz.
Thanks,
Rob
----------------------
Robert Coenen Ph. D.
Senior Applications Engineer
Scintera Networks
4340 Stevens Creek Blvd., Suite 260
San Jose, CA, 95129
Phone: (408) 557-2810 x43
Fax: (408) 557-2812
rcoenen@scintera.com
www.scinteranetworks.com
> -----Original Message-----
> From: Jonathan King [mailto:jking@BIGBEARNETWORKS.COM]
> Sent: Thursday, September 30, 2004 5:52 PM
> To: STDS-802-3-10GMMF@listserv.ieee.org
> Subject: [10GMMF] Next task 2 meet - paper on Modal Noise on Aerial
fibres
> - plus an experiment proposal
>
> Dear all
> good to see many of you in Ottawa at the interim meeting
>
> Since many are still traveling home, I propose that the next task 2
> (time varying meeting) should take place on
> wednesday 13th Oct 9.30am - is that soon enough? please let me know
your
> preferences.
> (If you feel an earlier meet up is required then we could meet on
> wednesday 6th Oct 9.30am - let me know)
>
> David Cunningham passed on a paper to me at the September interim
> showing some dynamic measurements on modal noise for aerial fibres,
> which is relevant to task 2 activities. I'll asked Piers to upload it
> to the ieee site for reference; alternatively the reference is
>
> 'Modal-Noise Characteristics in Aerial Optical Cables Subjected to
> Vibration', Hiromichi Shinohara, JLT, Vol LT-1,No-4, Dec 1983,
> pp535-541.
> Anyone want to volunteer to dig into it and summarize ?
>
> I have a proposal for making measurements of impulse response change
due
> to mechanical movement in a quasi-static manner on some real fibres in
> the lab:
> The process would be:
> set up an impulse response measurement test along the lines of the
> 'standard link', with a 3ply figure of 8 loop before the main fibre;
> move one side of the coil (as in TIA/EIA-455-203 fibre shaker)
stepping
> through a reasonable amplitude of motion, and record the impulse
> response at each step. It would give a picture of measured IPR
> evolution vs perturbation; I also propose that the power change
between
> temporal modes vs fibre movement for a few test fibres is generalized
to
> help build a model of IPR change vs movement, which in turn can be
used
> to build a model of degree of IPR vs frequency (using the GR-63-CORE
> vibration mask to relate frequency and amplitude of movement.
>
> Comments and advice invited
>
> best wishes
>
> Jonathan
>
> tel: 1 408 524 5110
> e-mail: jking@bigbearnetworks.com
> fax: 1 408 739 0568
>
> Jonathan King
> Director, Optical Systems
> BigBear Networks
> 345 Potrero Avenue
> Sunnyvale, CA 94085
>
>
> -----Original Message-----
> From: Jonathan King
> Sent: Thursday, September 23, 2004 4:30 PM
> To: STDS-802-3-10GMMF@listserv.ieee.org
> Subject: [10GMMF] Participant names and commenst for Task 2 (time
> variation) overview slides for September Interim
>
> Dear all
> last call for comments and amendments to the task 2 slide set for
Ottawa
> interim......its at:
>
> http://ieee802.org/3/aq/public/upload/index.html
>
> file name is
>
> Task 2 update: Time variation and modal noise study
> (22 Sept 04 rev 2, uploaded 23 Sept 04) 175K
>
> If you'd like your name to be added or deleted please let me know ASAP
> the current list of participants (ie those named themselves at >2
calls
> !)
> Robert Coenen, David Cunningham , John Dalessasse, Piers
> Dawe, Jens Fiedler, Ali Ghiasi, Pete Hallemeier, Jesper
> Hanberg, John Jaeger, Jonathan King, Paul Kolesar, Brent Lock,
> Tremant Maio, Petar Pepeljugoski, Petre Popescu, Andre Van
Schyndel,
> Gary Schaulov, Yu Sun , Norm Swanson, Lars Thon
>
> hope to see you in Ottawa
> best wishes
> Jonathan
>
> tel: 1 408 524 5110
> e-mail: jking@bigbearnetworks.com
> fax: 1 408 739 0568
>
> Jonathan King
> Director, Optical Systems
> BigBear Networks
> 345 Potrero Avenue
> Sunnyvale, CA 94085