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RE: [802.3ae] Bad idea...not including FP laser in PMD

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

-----Original Message-----
From: Norman Kwong [mailto:nkwong@xxxxxxxxxxxxxxx]
Sent: Thursday, March 28, 2002 2:23 PM
To: stds-802-3-hssg@xxxxxxxx
Cc: Norman Kwong
Subject: [802.3ae] Bad idea...not including FP laser in PMD

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:

  1. 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.)
  2. 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.
  3. 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.
  4. 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


Archcom Technology

Office: 626-969-0681 x121