Re: [8023-10GEPON] [POWER BUDGET] resolving differences over PIN vs. APD
Frank,
What I learned last week is that commercial specs are typically at 0 dBm for
minimum average output power for an EML.
However people do select to higher minimum output power specs, such as +1 to
+4 range or even +2 to +5 dBm. I was told that yields are getting difficult
and that +3 to +6 dBm would be ugly.
So I agree that +3 to +6 dBm TOSAs do exist today and are sold in
distributions. Whether that qualifies as "commercial" or not is
questionable. But they do exist.
I don't know how to translate those comments into relative cost, but I would
guess that requiring a +3dBm minimum raises the cost of the TOSA by a factor
of ~2x if one takes the approach of selecting from currently manufactured
lasers spec'ed at 0 dBm min. avg output.
Any comments from those more knowledgeable?
Robert
-----Original Message-----
From: Frank Chang [mailto:ychang@vitesse.com]
Sent: Saturday, July 07, 2007 3:28 PM
To: STDS-802-3-10GEPON@listserv.ieee.org
Subject: RE: [8023-10GEPON] [POWER BUDGET] resolving differences over
PIN vs. APD
Robert;
I was out of office thur-fri, lets connect monday and sort this out.
Actually during break last meeting, there already some discussion with
several experts. There exist multi high output TOSA vendors for either
1.55um EML or 1.3um DML. And even we use some such +2dBm and +4dBm part in
the lab., which shipping primarily for telecom market.
Frank
-----Original Message-----
From: Lingle, Jr, Robert (Robert) [mailto:rlingle@ofsoptics.com]
Sent: Friday, July 06, 2007 7:22 AM
To: STDS-802-3-10GEPON@listserv.ieee.org
Subject: Re: [8023-10GEPON] [POWER BUDGET] resolving differences over
PIN vs. APD
Frank Chang,
I think it was you and I who disagreed over whether +3dBM average output
power EMLs were commercially available, which is item #3 below.
Why don't we try to sort this out by Monday with examples of highest power
commercial EMLs available.
Robert
-----Original Message-----
From: Lingle, Jr, Robert (Robert) [mailto:rlingle@OFSOPTICS.COM]
Sent: Thursday, June 14, 2007 12:13 PM
To: STDS-802-3-10GEPON@listserv.ieee.org
Subject: [8023-10GEPON] [POWER BUDGET] resolving differences over PIN
vs. APD
All,
As chair noted in his email of 6/12, please recall the discussion we had on
Monday evening in Geneva about pros and cons of PIN vs. APD in ONU.
Attached are the straw polls and points of argument.
I have identified three items in red to focus on initially.
<<APD vs PIN pro-n-con.pdf>>
1. An objection was raised to having an amplified EML at OLT due to
non-linear interactions between D/S and analog video overlay. David Piehler
supplied a response that will be posted separately to start a thread.
In two cases we had task force members stating directly contradictory
opinions:
2. one stated that PIN ONU leads to lowest fully subscribed cost, while
another stated that PIN ONU leads to highest fully subscribed cost.
3. one stated that high power EMLs (+2 to +3 dBm minimum output power) for
use with APD at ONU are commercially available today, while another stated
that such high power EMLs are not available today.
I would like to ask for volunteers who hold opinions on point #2 and point
#3 to volunteer to defend these those positions on the Reflector, with
back-up information.
Warmest Regards,
Robert
Robert Lingle, Jr.
Fiber Design and Transmission Simulation
OFS Corporate R&D, Atlanta
404-886-3581 (cell)
770-798-5015 (office)