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On yesterday’s teleconference, a topic was discussed regarding the preferred wavelength range for 400G-SR8. It was suggested that slightly longer wavelength range than the
traditional 840 - 860 nm would be beneficial. However, given that SR8 is envisioned to be used for breakout applications, any change needs to remain compatible with 50G-SR, 100G-SR2 and 200G-SR4 which are presently specified over the traditional range.
That means one of three things must occur to make this a reality: 1) Remain within the 840 to 860 range, but narrow it by increasing the bottom end limit, perhaps to something like 845 nm. 2) Prove that detectors used for the traditional range that operate at 50G/s still meet all the draft specifications at slightly longer wavelengths. 3) Change the 50G, 100G, 200G range in P802.3cd to match the new longer range. Doing this may also involve a dose of 2). I’d like to discuss these alternatives, realizing that the transceiver makers among us have the best insights on options 1) and 2). I do not know if option 3), which offers
possibly the best alternative, will be well received at the present late stage of balloting. Thoughts? Regards, Paul To unsubscribe from the STDS-802-3-NGMMF list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-NGMMF&A=1 |