Re: [8023-10GEPON] [POWER_BUDGET] SOA/PIN for 10G/1G OLT receiver
Dear David,
Thank you for your exciting presentation yesterday.
I would like to confirm off-line talks with you yesterday.
I asked you to perform followings to validate your proposal and
you kindly accepted these requests.
(1)To provide some results (if possible, both experimental and
numerical) of BER curve measurements including BERs below 10E-12
to confirm whether there are error floors because I think
“error floor” means that the SNR does not linearly improve
with the optical input power and stay around an insufficient
SNR value.
(2)To provide some results of “Q” measurements to experime
-ntally confirm whether there are error floors because I think
it is hard (or takes a very long time) to measure sensitivities
at low bit-error rates.
Best regards,
Ken-Ichi
> Dear David,
>
> Thank you for your contribution and I am sorry for my late response.
> I think there is a conflict of views about the use of pre-amplifiers.
> So I would like to clarify that difference.
>
> I do not believe we need to use a narrow-band optical filter for
> 10G upstream signals, because the FEC can effectively compensate
> power penalty due to ASE noise.
> I believe we should avoid wide-gain-band (I think 20 or 30 nm is
> preferable.) for each signal because wide-gain-band increase ASE
> -ASE beat noise.
>
> So I think the problem is how to eliminate ASE noise for 1G-upstream
> signals because FEC is not mandatory and the use of a narrow-band
> optical filer is not practical due to its wide wavelength region.
> To make matters worse, ASE noise generates a noise floor in a 1G
> error rate curve in the wide-gain-band situation (Wide-gain-band
> will generate a significant noise floor.). I believe almost all
> the carriers require error free optical systems without a noise
> floor in error rate properties. So I think pre-amplifiers without
> optical filters or FECs are not acceptable.
>
> But I think the use of optical amplifier is possible in the dual
> rate situation.
> We can use an optically-paralleled configuration when we use a
> pre-amplifier.
> In this configuration, the use of an asymmetric (1:n) power splitter
> can achieve the same 1G power penalty as or less 1G power penalty
> than that of the electrically-paralleled configuration. Moreover,
> pre-amplifiers can compensate the splitter loss (1/(n+1)) and easily
> achieve the 10G sensitivity of -27 dBm or less.
>
> Best regards,
> Ken-ichi
>
> At 2007/05/10 17:55 David Piehler wrote:
> > All, Please see attached file which addresses issues raised in the email
> > and teleconference discussions.
> >
> > I will plan to present this material as well as experimental results at
> > the upcoming study group meeting in Geneva.
> >
> > Please let me know if there are other issues to be addressed. I look
> > forward to any comments.
> >
> > Thanks!
> >
> > David
> >
> >
> > David Piehler
> > Alphion
> > mobile: +1 732 692 4581
> >
> > -----Original Message-----
> > From: Lingle, Jr, Robert (Robert) [mailto:rlingle@OFSOPTICS.COM]
> > Sent: Friday, February 23, 2007 5:12 PM
> > To: STDS-802-3-10GEPON@LISTSERV.IEEE.ORG
> > Subject: [8023-10GEPON] [POWER_BUDGET] SOA/PIN for 10G/1G OLT receiver
> >
> > All,
> >
> > The next call(s) will occur on Tuesday Feb 27 at 7PM EST and Wednesday
> > Feb
> > 28 at 9AM EST.
> >
> > Toll-free in US 866-263-8899
> > Outside US 816-249-6061
> > Conf. Code 7707985015
> >
> > Robert
> >
> > Robert Lingle, Jr.
> > Fiber Design and Transmission Simulation OFS Corporate R&D, Atlanta
> > 404-886-3581 (cell)
> > 770-798-5015 (office)
Ken-Ichi Suzuki
NTT Access Network Service Systems Labs
Tel:+81-43-211-3189/Fax:+81-43-211-8250
E-mail:kenyichi@ansl.ntt.co.jp