Re: [802.3_NGEPON] Upstream Wavelength Plan

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Fair observations, Ed, and I am not the right person to answer the first bullet point – it might be a valuable contribution from Funada-san if there is enough time to examine it before the F2F meeting.

I just noticed that a slight reshuffling of wavelengths could minimize 25G channel challenges and posh them towards the system we know will be able to absorb penalties easier (I am not saying it is cost zero and trivial, just simpler than for 25G)

From: Harstead, Ed (Nokia - US) [mailto:ed.harstead@xxxxxxxxx]
Sent: Thursday, January 4, 2018 2:32 PM
To: Marek Hajduczenia <mxhajduczenia@xxxxxxxxx>; STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
Subject: RE: [802.3_NGEPON] Upstream Wavelength Plan

I agree that separate DBA domains for 10G and 25G upstream is desirable. In pure 50G greenfield we already have a mechanism—just use US0-A and US0-B (harstead_3ca_1_0917). Marek’s proposal is to extend this capability to the 10G PON brownfield co-existence scenario.

The disadvantages that I see:

A small DS/US gap for these 25/10 US0-A ONUs—only 25 nm. I don’t know the penalty, as funada_3ca_1_0117 does not address penalties for gaps this small. It could be sizable. Is there a risk that 25 nm gap is not implementable in the traditional 45 degree BOSA?
Lose the advantage John has cited with his favored plan, that of not requiring a new wavelength for 10G DMLs (1310 nm DMLs exist).

From: Marek Hajduczenia [mailto:mxhajduczenia@xxxxxxxxx]
Sent: Thursday, January 04, 2018 4:13 PM
To: STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_NGEPON] Upstream Wavelength Plan

That might James' opinion. I do not share it. We have enough spectrum to optionally allow WDM coexistence between 25G and 10G systems.

At the end of the day, I personally do not care about new 10G upstream, but only about making both 25G channels equally challenging and limit their dispersion penalty. I do know though that the optional ability to do 10G and 1G upstream separation in today's system is a saving grace in many deployments where these systems are overlapped on the same fiber strand. I do not see any advance of doing the overlap if we can have some separation between these systems

On Thu, Jan 4, 2018 at 2:08 PM, John Johnson <john.johnson@xxxxxxxxxxxx> wrote:

Marek,

zhang_dezhi_3ca_2a_1117 proposed the principal that different rates in the same PON generation should share spectrum by TDM. I think that this principal should apply to 25G and 10G (using 25G protocol) upstream.

Ed, please add me to your list.

Regards,
John

On Thu, Jan 4, 2018 at 3:08 PM, Marek Hajduczenia <mxhajduczenia@xxxxxxxxx> wrote:
Ed et al.,

Here are two versions of what I was suggesting, depending on how we want to stack red 25/10G options

Please include me in the discussion chain.

Thanks

M

From: Harstead, Ed (Nokia - US) [mailto:ed.harstead@xxxxxxxxx]
Sent: Thursday, January 4, 2018 12:48 PM
To: STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
Subject: [802.3_NGEPON] Upstream Wavelength Plan

All,

Per the discussion on today’s call: For anyone interested in joining the small group working to achieve consensus on the upstream wavelength plan, please send me an email.

Ed

From: Curtis Knittle [mailto:C.Knittle@xxxxxxxxxxxxx]
Sent: Wednesday, January 03, 2018 4:09 PM
To: STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
Subject: [802.3_NGEPON] 1/4/18 IEEE 802.3ca (100G-EPON) consensus building meeting agenda

Dear Colleagues,

We have two contributions for consensus-building meeting on January 4, 2018:

Upstream Wavelength Plan - Ed Harstead
Upstream Burst Structure – Marek Hajduczenia

Meeting time is 11:30 – 1:00 Mountain Standard Time. Zoom details are below.

Curtis

Join from PC, Mac, Linux, iOS or Android: https://cablelabs.zoom.us/j/804971785

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Curtis Knittle
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