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I agree that we don't have enough spectrum and don't need mess up too much with the agreed upstream plan.
Here is what I proposed alternative wavelength plan option based on following reasons:
10G US0 should be left unchanged 1310+/-10nm.
25G US0 can be shifted to 1295nm with 5nm passband for lower dispersion penalty and reuse LR4 wavelength.
25G US0 can be TDM coexistence with 10G US0 for low cost 25G/10G asymmetric ONU
when 2x25 is deployed, US0-B should be reused for 25G US1 since 10G and 50G are none adjacent generation in this case.
50G single wavelength can use 1310nm+/-2.5nm for TDM coexistence with 10G US0 or WDM coexistence with 25G US0.
Please also add my name in the discussion list, Thank you.
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Would this arrangement then be more acceptable? While I do understand that some operators might be more interested in asymmetric systems, at the same time, 10G system side is more forgiving in terms of transmission penalties, so both 25G channels should be as close to each other as possible to make them present as similar penalties as possible to simplify the design of 2x25G optics.
Just a comment on “We have enough spectrum to optionally allow WDM coexistence between 25G and 10G systems”
I don’t think we have ample spectrum which we allow we allocate the wavelength plan casually.
All the wavelength we discussed here are low dispersion O-band, they are very precious spectrum for high speed PONs, including the even higher speed PON systems.
The low dispersion band is very limited, we should use them in an efficient way.
The asymmetric ONUs are always the major volume, so a symmetric OLT are often required to support the asymmetric ONUs ( maybe some operators don’t care 25/10, but there are definitely some other operators quite interesting on 25/10), it will be a big waste to allocate a different wavelength band for asymmetric systems.
I am interesting on the upstream wavelength plan, so please add me in to the discussion email list. Thanks.
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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:
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.
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.
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.
We have two contributions for consensus-building meeting on January 4, 2018:
Upstream Wavelength Plan - Ed Harstead
Upstream Burst Structure – Marek Hajduczenia
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