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Steve,
This is an issue. See:
http://grouper.ieee.org/groups/802/3/ba/public/mar08/petrilla_02_0308.pdf
for a discussion of a ten lane version of the problem.
Since then, new versions of the relevant standards IEC 60825-1 and IEC 60825-2 have been issued by IEC.
Regards,
Pete Anslow | Senior Standards Advisor
43-51 Worship Street | London, EC2A 2DX, UK
Direct +44 2070 125535 |
From: Trowbridge, Stephen J (Steve) [mailto:steve.trowbridge@xxxxxxxxxxxxxxxxxx]
Sent: 18 August 2014 16:35
To: STDS-802-3-400G@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-3-400G] [802.3_400G] IEEE P802.3bs 400 Gb/s Ethernet MMF Ad Hoc - August 8th unapproved minutes
Hi Mike,
This tends to be more of an issue in WDM systems where the power is all in one fiber. Since this is ribbon fiber, I suspect it needs to be investigated what the cross-sectional area is of the ribbon fiber and what the chance is that more than x of 16 lanes would be incident on someone’s eye in the event of cutting the cable or pulling the connector. I think the connector distributes the lanes widely enough it isn’t a problem. I suppose if someone saw this as an application for multicore fiber this might be more of an issue.
Regards,
Steve
From: Mike Dudek [mailto:mike.dudek@xxxxxxxxxx]
Sent: Monday, August 18, 2014 9:26 AM
To: STDS-802-3-400G@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-3-400G] [802.3_400G] IEEE P802.3bs 400 Gb/s Ethernet MMF Ad Hoc - August 8th unapproved minutes
One key aspect of whether a 16x25G solution can heavily leverage 100GBASE-SR4 is whether the output power per lane would have to be reduced significantly due to eye safety concerns. I would encourage the experts to address this. (I don’t think it has been yet.)
Mike Dudek
QLogic Corporation
Director Signal Integrity
26650 Aliso Viejo Parkway
Aliso Viejo CA 92656
949 389 6269 - office.
From: Jonathan King [mailto:jonathan.king@xxxxxxxxxxx]
Sent: Friday, August 15, 2014 11:45 PM
To: STDS-802-3-400G@xxxxxxxxxxxxxxxxx
Cc: Kaku_Shinkyo@xxxxxxxxxxxxxxxxx; Zhongfeng Wang; Kumaran Krishnasamy; Chris Cole; Endres, Herbert; Ajay Dubey; Mark Jones; Tracy, Nathan L; Ressl, Michael; Kenneth Jackson/ABQSEDU; Jim Theodoras; louie@xxxxxxxxxxx; Petar Pepeljugoski/Watson/IBM; Haoyu song; Thananya Baldwin; Carlo Tosetti (ctosetti); Marco Mazzini (mmazzini); Mike Peng Li; John_DAmbrosia@xxxxxxxx; Umnov, Alexander; Mark Gustlin; mbrown@xxxxxxx; Lingle, Robert L (Robert); Alan Ugolini; Adrian Butter/Endicott/IBM; Abbott, John S Dr; Mukund Kshirsagar; Markus Lang; Ten, Sergey Y; Mounir Meghelli/Watson/IBM; Piers Dawe; Danny.Morlion@xxxxxxx; aszczepanek@xxxxxxxxx; Martin Langhammer; Mike Dudek; Gary Nicholl (gnicholl); Pirooz Tooyserkani (pirooz); Andy Moorwood; Ryan Latchman; Glick, Harold A CIV NSWC Corona, MS30; Dan Dove; Jeff Hutchins; John F Ewen/Rochester/IBM; Rashid Kukkady; John Lehman/EST/ATCS; Jerry Pepper; RJPI(Rick Pimpinella); Jeffery Maki
Subject: RE: [802.3_400G] IEEE P802.3bs 400 Gb/s Ethernet MMF Ad Hoc - August 8th unapproved minutes
Dear all
Unapproved minutes for the 400G MMF ad hoc are available on the MMF ad hoc public area. Here’s a link:
http://www.ieee802.org/3/bs/public/adhoc/mmf/index.shtml
Please let me have any comments or corrections as soon as you are able – thank you!
As announced at the last MMF 400G ad hoc call, the next ad hoc will be hosted on August 22nd, 8am to 10am Pacific.
Best wishes
jonathan