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Norman:
It is too late to add major functionality you
describe to the 802.3ae project. As you point out, the committee discussed
the topic and made its decision a long time ago. The P802.3ae draft has
completed Working Group and is in the final stages of Sponsor ballot. The
addition you propose is outside the scope of the current Sponsor recirculation
ballot and therefore should not be considered by the P802.3ae Task
Force.
Bob Grow
Chair, IEEE 802.3 Working Group
Intel, EC2-101
13290 Evening
Creek Drive
San Diego, CA 92128
phone: 858-391-4622
mobile:
858-705-1829
fax: 858-391-4580
Dear 802.3ae
members
I understand that this is an old topic, but I still strongly believe
that it is a bad idea not to include 1310 nm Fabry-Perot (FP) lasers in the
PMD. Let me re-cap some of the
advantages of FP lasers:
- Low cost comparing to DFB lasers: high yield single-growth wafer
process, less sensitive to back reflection that eliminates the need for
isolator in package. (1.3 VCSEL
yield/cost is not clear now, therefore it is hard to compare.)
- Edge emitting lasers (FP and DFB) are more mature technology and have
been deployed in market for many years. Both lasers are available today
through multiple vendors.
- FP laser can handle at least 0 to 2km (some test even indicate 7km is
possible). And majority of the 10G Ethernet applications fall into this
range.
- Some companies are shipping transceiver/transponder products using
1310 FP lasers today, but unfortunately they are being treated as
non-802.3ae standard products.
The current 1310
PMD specification has a 30 dB SMSR spec that prohibits the use of FP
lasers. I believe that it is to
the best interest of our industry to standardize a PMD based on 1310 nm FP
lasers. If there is a way to
start a new project or modify the current specifications to include FP lasers,
I'll love to lead an effort on it.
Norman
Kwong
CTO
Archcom
Technology
Office:
626-969-0681 x121
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