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Frank, Great job in putting this together. Some comments: 1.
On Slide 3: There also has been discussion that NGEPON has upstream options of 25Gb/s and 10Gb/s on one or more 25G layers:
a.
10Gb/s option has not been decided. How do we come to a decision?
b.
Is the 10Gb/s option on all four 25G layers? For example, would there be an option for 100G/40G?
c.
How would NGEPON upstream at 25Gb/s and 10Gb/s co-exist with each other on the same 25G layer on the same PON segment? TDM or WDM? Or they don’t co-exist on the same PON segment?
d.
How would NGEPON 10Gb/s upstream coexist with 10GEPON upstream? TDM or WDM? Can TDM work for this? Could the 10GEPON OLT and NGEPON OLT distinguish between 10Gb/s data from 10GEPON ONU or NGEPON ONU
if they are on same wavelength? 2.
On Slide 3: This is confusing to me and may need further explanation for others also: 3.
On Slide 8: In my mind, It has not been settled that uncooled lasers cannot meet the power budget requirement or will not meet it in the future. One vendor stated that uncooled laser could achieve +6dBm
output power today under some conditions. The technology could improve further over a few years so uncooled lasers could meet the power budget. Since uncooled lasers can offer significantly lower ONU costs, the team may not want to preclude uncooled lasers
for upstream wavelength 0 by specifying a narrow wavelength range. Since there is only limited spectrum available, most likely cannot have 8 wavelengths, or even 4 wavelengths, with a wide wavelength range (~20nm) – maybe only for upstream wavelength 0 which
is the most cost-sensitive. 4.
Add call for further study on relative cost comparison for options on 25G ONU wavelength pair 0 since this could influence decisions. Specific areas:
a.
Uncooled DML vs. Cooled DML vs. Cooled EML upstream laser
b.
ONU diplexer: Focus Beam Filter versus Collimated Beam along with the optimal size of the minimum edge gap between the US wavelength and downstream wavelength. The edge gap will impact the wavelength
plan and ONU cost. Do we rule out other filter technologies (i.e. thin film) that can provide much smaller edge gaps? 5.
BTW, what does the acronym “PMD” mean? Thanks,
From: frank effenberger [mailto:frank.effenberger@xxxxxxxxxx]
All, Please see attached the “call for contributions” on PMD issues.
Unfortunately, I will be unable to attend the meeting tomorrow, as there is another standard meeting happening at that time.
But I would love to receive Email correspondence on this CFC – to either enhance it, or to
express interest in working on a topic. It would be highly efficient if we can identify the groups of people interested on each topic, so that they can create joint contributions that are more definitive. This is particularly true
of the topics that are mainly analytic (e.g., analysis of fiber nonlinearity impacts).
Thank you, Frank Effenberger |