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Re: [8023-10GEPON] [Channel link model ad-hoc]

Dear David,

(1)     I would not be so quick to dismiss XPM. $B!9(BPM gets stronger as delta lambda gets small, and at higher RF frequencies. $B!*(Bt$B!G(Bs not well known but most video signals have or less discrete, high modulation index, phase and/or intensity tones in the 2 $B!(B10 GHz range. $B!5(Bhese are used for SBS suppression, and they vary significantly among vendors.$B!(BI have not done any calculations, but there was a paper at ECOC this year from KDDI that showed that cross-talk from RF carriers could add a penalty $B!(Baside from power loss.

I looked for a paper you suggested, but I did not find it.
Anyway, if it is true, I agree with your comment.

(2)     Is there any need to define the acceptable degradation on the video signal?$B!(BThis is perhaps the most significant issue with the B/GPON RF video overlay.$B!(BI am not concerned with power loss (or gain) but rather the effective increase in RIN (mediated by either XPM or SRS), or by discrete RF interference from idle fames again mediated by XPM and/or SRS.$B!(B(Incidentally would these idle frames be in phase if you had several 10G DWDM signals originating from the same switch/router?

I do not think it is an issue of the channel link model, because we can not put it on the spread sheet and also it is an implementation issue of RF-ONU.
However, if we can consider it when we decide the output power level of 10GE-OLT and wavelength allocation of a downstream signal, it is good for us.

Sincerely yours,
Tsutomu TATSUTA


At 02:02 07/01/10, David Piehler wrote:
Just a few comments $B".(B
 
(1)     I would not be so quick to dismiss XPM. $B".(BXPM gets stronger as delta lambda gets small, and at higher RF frequencies. $B".(BIt$B!G(Bs not well known but most video signals have or less discrete, high modulation index, phase and/or intensity tones in the 2 $B".(B 10 GHz range. $B".(BThese are used for SBS suppression, and they vary significantly among vendors.$B".(B I have not done any calculations, but there was a paper at ECOC this year from KDDI that showed that cross-talk from RF carriers could add a penalty $B".(B aside from power loss.
 
(2)     Is there any need to define the acceptable degradation on the video signal?$B".(B This is perhaps the most significant issue with the B/GPON RF video overlay.$B".(B I am not concerned with power loss (or gain) but rather the effective increase in RIN (mediated by either XPM or SRS), or by discrete RF interference from idle fames again mediated by XPM and/or SRS.$B".(B (Incidentally would these idle frames be in phase if you had several 10G DWDM signals originating from the same switch/router?
 
I am not trying to open a big can of worms here, and my feeling is that these effects are probably negligible, although measurable.
 
 
 
David Piehler
Alphion
mobile: +1 732 692 4581
From: Hajduczenia, Marek [mailto:marek.hajduczenia@SIEMENS.COM]
Sent: Tuesday, January 09, 2007 3:56 AM
To: STDS-802-3-10GEPON@listserv.ieee.org
Subject: Re: [8023-10GEPON] [Channel link model ad-hoc]
 
Dear Tatsuta-san,
Thank You very much for Your contribution. I found it useful and if there is no problem with it, I would like to reuse part of Your conclusions in the introductory section of the presentation on the ad-hoc activities.
I agree with Your conclusions and I believe that the updated Excel spreadsheet will contain SBS and SRS power penalties - SRS is completed while SBS is still under examination to achieve 0 - order approximation with reasonable quality.
 
The presentation will be distributed today and I will ask for the potential supporters of the conclusions and implementation.
The updated Excel spreadsheet will also be distributed in due time on the reflector ...
 
Best wishes
 

Marek Hajduczenia (141238)
SIEMENS Networks S.A. - IC COM D1 R
Rua Irm$B".(Bos Siemens, 1
Ed. 1, Piso 1
Alfragide
2720-093 Amadora
Portugal
* Marek.Hajduczenia@siemens.com
http://marekhaj.easyisp.pl/index.php
(+351.21.416.7472  4+351.21.424.2082
 
 
 
From: TATSUTA [mailto:tatsuta@ansl.ntt.co.jp]
Sent: ter$B".(Ba-feira, 9 de Janeiro de 2007 6:32
To: Hajduczenia, Marek; STDS-802-3-10GEPON@listserv.ieee.org
Subject: Re: [8023-10GEPON] [Channel link model ad-hoc]
Dear Marek and all,

I summarized the influence of RF signal as attached.
My conclusion is following;

1. SRS and SBS should be studied.
2. XPM does not need to be considered, if a wavelength of 10G-EPON downstream is separated in 5nm or more from RF signal wavelength.
3. The other items do not need to be considered, unless S/X value of ONU input point is specified in the standard body (I do not think we specify it.). I think S/X is implementation issue.

Sincerely yours,
Tsutomu TATSUTA


At 21:41 07/01/04, Hajduczenia, Marek wrote:

Dear Sergey,
I would appreciate any help You can provide me with. I have some formulas to estimate the impact of the video channel overlay on the downstream and upstream channels but I have a very hard time trying to figure out how to calculate / estimate the values of individual parameters.
Do You have any idea how to apply the formulas with the set of parameters that we have in the Excel spreadsheet?
Best wishes
 
Marek Hajduczenia (141238)
SIEMENS Networks S.A. - IC COM D1 R
Rua Irm$BeP(Bs Siemens, 1
Ed. 1, Piso 1
Alfragide
2720-093 Amadora
Portugal
* Marek.Hajduczenia@siemens.com
http://marekhaj.easyisp.pl/index.php
(+351.21.416.7472  4+351.21.424.2082<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

 
 
From: Ten, Sergey Y [mailto:TenS@CORNING.COM]
Sent: quarta-feira, 3 de Janeiro de 2007 19:32
To: STDS-802-3-10GEPON@listserv.ieee.org
Subject: Re: [8023-10GEPON] [Channel link model ad-hoc]

Marek,

The impact of the RF overlay may be modeled (in zero approxiamtion) as increased loss at data signal wavelength since Raman scattering will transfer energy from digital signal to video signal.

In the next order approximation one has to take into account transfer of the modulation.

I can help you with taking into account zero approximation.

SergeyFax  +1 607 974 4354

-----Original Message-----
From: Hajduczenia, Marek [mailto:marek.hajduczenia@SIEMENS.COM]
Sent: Wednesday, January 03, 2007 11:14 AM
To: STDS-802-3-10GEPON@listserv.ieee.org
Subject: [8023-10GEPON] [Channel link model ad-hoc]

 

Dear all,

since there was no activity in the said ad-hoc for some time, I decided to run the first update of the channel link model spreadsheet (please find it attached in a zipped form - 10GEPON-D.0.0.zip). The main changes included in this release are as follows:
To be added, if required: changing the average splitter type into worst/best case scenario values - preferably with the switch variables defined in the spreadsheet (may be tough to find some space for that though :-9)

 

As for the other parameters in the spreadsheet: as Dawe suggested previously, we should probably examine the "TP4 offset cell" (T8) which currently follows "Tx mask top" (G14) in similar style to 10GEPBud3_1_16a.xls. Dawe thinks that this cell needs a thorough review and we should adjust its value in such a way that it compensates for the upstream channel burst mode transmission.

 

Additionally, we should try to numerate the impact of the optional video overlay channel on the overall power budget. Is anyone willing to help me with that ?

 

Thank You for Your time and attention

 

Best wishes

Marek Hajduczenia (141238)
SIEMENS Networks S.A. - IC COM D1 R
Rua Irm$BeP(Bs Siemens, 1
Ed. 1, Piso 1
Alfragide
2720-093 Amadora
Portugal
* Marek.Hajduczenia@siemens.com
http://marekhaj.easyisp.pl/index.php
(+351.21.416.7472  4+351.21.424.2082