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Re: [802.3_DWDM] IEEE P802.3cw Optical Crosstalk Ad hoc 02 Dec 2020 Material uploaded

Hi Bo,

The presentation that you showed had different filter sets providing the same passband for the signal channel. My presentation last week was based on the isolation between the signal channel and crosstalk on adjacent ports. The key here is that defining only the signal channels' bandwidth isn't sufficient but the impact on other ports needs to be considered.

Including this additional definition removes the need to specify individual components inside the black link. So the test points won't be changed, TP2 and TP3 will still be the relevant points for Black Link measurement. What will be included is additional information on the black link's transfer function.

I had some other questions related to the measurement slide, I think when I expand on this on this week's ad-hoc call it should be more clear.

Regards,  Eric




On Thu, Dec 3, 2020 at 3:09 PM Bo Zhang <bozbozboz@xxxxxxxxx> wrote:

Hi Eric,

 

To John’s encouragement of leveraging the reflector, I would like to pick up from where we left off from the ad-hoc. Specifically to your last slide in your contribution, what do you envision as the needed work items in the P802.3cw draft if we were to further your approach for black link test methodology for crosstalk parameter.

 

From my perspective, I see one needs to understand below items at a minimum

  • The exact stimulus (whether it’s broadband or tunable light or an actual 400G ZR Tx or something else)
  • The exact response (whether it’s integrated power or spectral contents or something else)
  • The exact stimulus test points (whether it’s TP2, TP2’ from adjacent channels)
  • The exact response test points (whether it’s TP3, TP3’ from adjacent channels)
  • The test conditions of the black link (in terms of BA and PA settings as compared to in-service mode)

 

Also, for your initial isolation value recommendation, what’s your view when it applies to the counterexample I gave in slide 13 of my Nov. 16th P802.3cw presentation

 

Thanks,

-Bo


On Wed, Dec 2, 2020 at 3:36 PM John D'Ambrosia <jdambrosia@xxxxxxxxx> wrote:

All,

The material for today’s IEEE P802.3cw Optical Crosstalk Ad hoc meeting has been uploaded and may be found at https://www.ieee802.org/3/cw/public/adhoc/20_1202/index.html

 

Please note I have not completed meeting notes yet, but wanted to get the technical material uploaded for all to begin reviewing.

 

Regards,

 

John D’Ambrosia

Chair, IEEE P802.3cw Task Force

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--
-Bo

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