Re: [8023-10GEPON] [Link_model] Link model tools updated ...
Dear Glen,
Unfortunately I can not attend 802.3av task force meeting in Florida.
But Mr. Yanagisawa is attending the meeting, he is expert of optical
transceiver. Please discuss him about this topics.
I am trying to understand the spread sheet for 10GE-PON optical link
model. During the discussion with my colleagues and some Japaneses .3av
members, we recognized that the spread sheet does not consider a
dispersion penalty by LD charp. It is also mentioned in
http://www.ieee802.org/3/efm/public/sep01/dawe_1_0901.pdf
I am now studying the equation for dispersion and definition of
dispersion penalty by charp. And dispersion penalty is closely related
with charp parameter.
I think there are several issues for definition of dispersion penalty.
I will prepare a presentation for next meeting.
Best Regards.
Naoto Saeki, NEC Corporation.
Glen Kramer wrote:
> Dear Saeki-san,
>
> I do not recall anyone pointing out that dispersion compensation is
> calculated improperly in the current Link Model spreadsheet. Also, I
> looked in 3av_0611_tanaka_1.pdf and this file does not say that either.
>
> Could you please, provide more details of what is incorrect in your
> opinion?
>
> I am working on a schedule for our Orlando meeting right now. If you
> want to initiate/lead this discussion, please prepare a presentation
> that outlines the issues and suggests a solution.
>
> Please, let me know ASAP how much time you would like me to allocate for
> this discussion. (Since this is a post-deadline request, I will allocate
> the time on a best-effort basis, but it looks right now that we will be
> able to accommodate this request.)
>
> I would also suggest that you discuss this issue and the proposed
> solution with the original authors of the Link model and either get
> their support for the changes, or get the explanation of why the
> dispersion penalty calculation is not accurate, and was not accurate for
> many years, as you said. I copied this e-mail to them as well.
>
> Thank you,
> Glen
>
>
>
>> -----Original Message-----
>> From: NAOTO SAEKI [mailto:n-saeki@bl.jp.nec.com]
>> Sent: Friday, March 09, 2007 1:08 AM
>> To: STDS-802-3-10GEPON@listserv.ieee.org
>> Subject: Re: [8023-10GEPON] [Link_model] Link model tools updated ...
>>
>> Dear Marek,
>>
>> This is Naoto Saeki of NEC.
>>
>> We had a discussion on the current spread sheets among some Japanese
>> members.
>> And we have found out there are several issues to be considered.
>>
>> One of the most important issue is that chromatic dispersion penalty
> of
>> single
>> mode LD is not accurately incorporated in the spread sheets. I think
>> this had
>> already been pointed out by many members, but has been left as it is
> for
>> many
>> years.
>>
>> In specifying the power budgets, it is very important to know how much
>> dispersion penalty should be alocated in channel insertion loss for
>> upstream
>> and downstream. And so the spread sheets should play a role in
>> estimating such
>> power penalties. However, with the current spread sheets, we may not
> be
>> able
>> to estimate the dispersion penalty properly.
>>
>> Considering this situation, we should discuss in the upcoming plenary
>> meeting
>> about how we incorporate the dipersion pelalty in the spread sheets.
>>
>> This issue was already discussed a little in the last November meeting
> as
>> described in "3av_0611_tanaka_1.pdf".
>>
>> So I think it is good idea to restart the discussion with this
> material.
>>
>>
>> Hajduczenia, Marek wrote:
>>> Dear all,
>>>
>>> the updated set of tools for Link Channel model is available at:
>> http://www.ieee802.org/3/av/public/tools/index.html
>>> There are two updated Excel spreadsheets and 4 Matlab files with:
>>>
>>> * the implementation of the SRS penalty calculator and two
> exemplary
>> files presenting how to use the said package
>>> * implemented attenuation curves for G.652 A&B and C&D fibers
>>>
>>> The code is densely commented thus I expect no problems with their
>> application.
>>> Should any issues arise, please let me know.
>>>
>>> Best wishes
>>>
>>> Marek
>>>
>> --
>> **********************************************************
>> Naoto Saeki Network Platform Development Division
>> NEC Corporation
>> E-mail: n-saeki@bl.jp.nec.com
>> TEL : +81-4-7185-7523 (Ext. 78371)
>> Cell: +81-80-6600-8697
>> FAX : +81-4-7185-7939
>> ***********************************************************
>> All Contents of this Email are Considered NEC Proprietary and
>> Confidential - Use Pursuant to Company Instructions.
>
--
**********************************************************
Naoto Saeki Network Platform Development Division
NEC Corporation
E-mail: n-saeki@bl.jp.nec.com
TEL : +81-4-7185-7523 (Ext. 78371)
Cell: +81-80-6600-8697
FAX : +81-4-7185-7939
***********************************************************
All Contents of this Email are Considered NEC Proprietary and
Confidential - Use Pursuant to Company Instructions.