[802.3_OMEGA] Center wavelength
This message is in reply to comment by Ruben, and in support of Vipul's message. This will appear as a
new message because I am not able to "reply" to a threaded message.
Why write a standard? If one or two suppliers meet a requirement, and specifications are written just for them,
it is a private arrangement. It does not meet the “Broad Market Potential” part of the CSD. The CSD states
"Multiple vendors and numerous users."
There is no difference in the ability to meet requirements for automotive links between the presentation by
Mirko Hoser and me (as Vipul noted in his message). There is literature (Thank you, John Abbott) to support
what I showed and illustrate how VCSEL reliability calculations are done. [Dubravko Babic, J. Control, Measurement,
Electronics, Computing, and Communications, Vol. 62 365-374 (2021)]. Reliability models are product specific -
VCSEL is not CMOS.
There are more than five suppliers of VCSELs that can meet the automotive requirements and the
draft as written keeps them out.
I don’t see what the big concern is about testing. Define two bands, 840 - 950 nm and 970 - 990 nm if it is
so concerning. As Vipul stated, based on many years of product experience, there was no impact on receiver cost
from the wide wavelength band of 840 - 950 nm in SWDM. Our experience of receivers operating over the
narrower window of 840 - 920 nm shows the same.
Ramana Murty
Affilated with Broadcom
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