Hi Maurice,
Just following the arguments You used in
Your email: does that mean that You see PR(X)20 OLT transmitters as uncooled
devices? Are the power levels we are targeting achievable using uncooled optics?
As far as I understand, cooling is necessary not only to keep the central wavelength
within the predefined range but also assure higher output power level. Can You
comment on this?
Regards
Marek
From:
Maurice Reintjes [mailto:maurice.reintjes@xxxxxxxxxxxxx]
Sent: quarta-feira, 5 de Novembro
de 2008 12:49
To:
STDS-802-3-10GEPON@xxxxxxxxxxxxxxxxx
Subject: Re: [8023-10GEPON] FW:
Downstream wavelength
Hi Victor: I appreciate your comments, as they
describe the existing conditions in the end solution space.
To
that end I support your comments, and position which is also advocated by Jim
Farmer.
My
rational is that optical sources do not need to be so expensive and tightly
temperature controlled when you can use the 1580-1600nm band,
and
when you remove the tight wavelength requirement, optical , sources get
cheaper, and thus increase the chances of wide
acceptance
as was the case of 1GEPON, which uses low-cost optics.
Allowing
a wider wavelength range also consumes less power, and can be viewed as being
more "green"; something which was not
a
direct component to the initial PAR, but should be a factor that all engineers
take in to account when developing a new standard.
Best
Regards
Maurice
Reintjes
MindspeedTM
Hillsboro, Oregon,USA
Office Phone (503)-403-5370
Mobile (503)-701-0797
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Victor Blake
<victorblake@xxxxxxx>
11/04/2008 06:21 PM
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Please
respond to
Victor Blake <victorblake@xxxxxxx>
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To
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STDS-802-3-10GEPON@xxxxxxxxxxxxxxxxx
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cc
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Subject
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Re: [8023-10GEPON] FW: Downstream wavelength
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Jim,
As an early supporter of 10GigEPON (starting
at the CFI) I am writing to the task force to express my support for your
proposal. I believe that the 1580-1600nm wavelength would be more appropriate
for use in the North American and in particular US MSO market. This market is
composed of operators have existing wavelengths in use of their plant. Some
already have substantial EPON deployments.
As you have pointed out, 1577 (1574-1580nm)
could be substantial problem for MSOs. Having the second wavelength available
for this market need would help to avoid a conflict between 10GigEPON and
broadcast video – to which 10GigEPON would surely loose out. If the task force
were to elect to keep 1590nm out of the plan, they would be spelling out
certain disaster for 10GigEPON as we know specifically of the efforts to use
1590nm for current proposals for a next generation GPON solution. The result of
keeping 1590nm out of 10GigEPON would be to force the MSO industry to GPON.
I’ll just assume that is not the goal of the 10GigEPON Task Force, but it
nevertheless would be the most likely outcome.
In fact it is no surprise to find that the
GPON vendors are the ones most supportive of this proposed change.
I’ve communicated with a number of major US
MSOs about this issue. The three I have directly received responses from all
support 1590nm and wish to continue to see it as their first choice. Although
these organizations are not directly represented in the IEEE today, they have
from time to time participated in the past, and are certainly the largest EPON
and 10GigEPON market in North America
currently. For this reason, I urge the task force members to reach out to the
MSO community and solicit their opinions if you do not already know where they
stand.
Victor Blake
Independent Consultant
From: Jim Farmer
[mailto:Jim.Farmer@xxxxxxxxxxxxx]
Sent: sábado, 1 de Novembro de 2008 15:59
To: STDS-802-3-10GEPON@xxxxxxxxxxxxxxxxx
Subject: [8023-10GEPON] FW: Downstream wavelength
We
request to make the attached presentation during the 10GEPON meeting in Dallas. We remain
concerned over the decision to drop the 1590 nm downstream band from the plan,
for reasons shown in the attached. Note that there are notes that go with
most of the slides. You can see them by going to View|Notes Page
Thanks,
Alan Brown
Jim Farmer
Jim
Farmer, K4BSE
Chief Network Architect,
Enablence Technology
FTTx Networks Division.
1075 Windward Ridge Parkway
Alpharetta, GA 30005 USA
678-339-1045
678-640-0860 (cell)
jim.farmer@xxxxxxxxxxxxx
www.enablence.com
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