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Dear John, Below presentation addresses TDECQ down to -200 ps/nm dispersion (with T-spaced 5-tap FFE), shown in page 5. As usual to EML, it shows negative CD penalty down to -150 ps/nm. http://www.ieee802.org/3/B10K/public/18_09/jackson_b10k_01_0918.pdf Regards, ------------------------------------------------- Hideki Ooe <ooe-hideki@xxxxxxxxx> Transmission Devices Laboratories Sumitomo Electric Industries From: Brian Welch (bpwelch) <00000e3f3facf699-dmarc-request@xxxxxxxx> John, Thanks for sending, I hadn’t seen these. However in looking at them I don’t see that any TDECQ measurements were taken. Sone_b10k_01a_1117 does indicate some CD penalties, but it does so using a T/2 spaced 17-tap FFE as the receiver, which is quite a bit different that the reference receiver in use in a TDECQ measurement. Do you know of any TDECQ measurements taken (with the prescribed reference equalizer)? Also, given that there are negative CD penalties down to as low as -150 ps/nm suggests that the transmitters in use have quite a bit of chirp. Do you know if measurements were performed for any un-chirped transmitters? Thanks, Brian From: John DAmbrosia <jdambrosia@xxxxxxxxx> All, Yesterday an issue was raised regarding dispersion, and there was an inquiry regarding any presentations on the topic had been heard. My thanks to Peter Stassar, who did the digging through the Study Group archives to find the following presentations that had explored assessing the dispersion penalty at high negative dispersion of around -200ps/nm. As I recall now, this was a key issue for the Study Group to resolve before it finally adopted the 40km objectives and could answer the Technical Feasibility Criteria. SG material. November 2017: http://www.ieee802.org/3/B10K/public/17_11/sone_b10k_01a_1117.pdf January 2018: http://www.ieee802.org/3/B10K/public/18_01/yamamoto_b10k_01a_0118.pdf March 2018 http://www.ieee802.org/3/B10K/public/18_03/yu_b10k_01c_0318.pdf Regards, John D’Ambrosia Chair, IEEE P802.3cn Task Force To unsubscribe from the STDS-802-3-B10K list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-B10K&A=1 To unsubscribe from the STDS-802-3-B10K list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-B10K&A=1 To unsubscribe from the STDS-802-3-B10K list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-B10K&A=1 |