FreeLists / si-list / [SI-LIST] Re: [RE]Impulse response of MMF - implementing FO models in SPICE

["Ashok Prabhu M" <g0203501@xxxxxxxxxx>]

Hi all,

   Thank you all for your replies regarding my question.

I am sorry if this is an off topic question.

I would like to get suggestions on how good it is to model
fiber optic system elements in SPICE.=20

Is there any efforts going on to create SPICE models for=20
photonic elements like laser diode, Photo diode, fiber etc.
If so please give me some pointers on this.

Regards
Ashok

-----Original Message-----
From: Lawrence Williams [mailto:williams@xxxxxxxxxx]=20
Sent: Friday, June 06, 2003 10:14 PM
To: g0203501@xxxxxxxxxx
Subject: RE: [SI-LIST] [RE]Impulse response of MMF

Greetings Ashok:

Please take a look at

http://grouper.ieee.org/groups/802/3/ae/public/index.html

to see the presentations made at numerous standards meetings for 10G
Ethernet.  The short reach options use MMF and there was considerable
effort
placed on channel modeling.  I recall that HP contributed measured data
for
the impulse response.  Broadcom and others used this data to consider
equalization strategies.

Hope it helps.

Regards,

Larry

___________________________________
Lawrence I. Williams, Ph.D.
Director of Business Development
Ansoft Corporation

1-714-528-9358
1-714-747-5894 cell
___________________________________
williams@xxxxxxxxxx
www.ansoft.com

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-
bounce@xxxxxxxxxxxxx]On
Behalf Of jina
Sent: Thursday, June 05, 2003 11:46 PM
To: g0203501@xxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] [RE]Impulse response of MMF


 p {margin-top:0px;margin-bottom:0px;}
Ashok,

Since MMF is optical medium not like copper traces, it's better for you
to
specify light source and receiver, such as laser diode and photo-
detector.

Usually, Laser diode has significantly different characterstics under DC
biasconditions.  If biased above threshold currents, then laser diode
has
overshoot and relaxation oscillation characteristics.  Simply, you can
model
RLC tank circuits.



Pls let me know if you need to know more about this,

Regards,

Carl Ryu

---------[ =B9=DE=C0=BA =B8=DE=C0=CF =B3=BB=BF=EB ]----------
=C1=A6=B8=F1 : [SI-LIST] Impulse response of MMF
=B3=AF=C2=A5 : Wed, 21 May 2003 11:02:16 +0800
=BA=B8=B3=BD=C0=CC : "Ashok Prabhu M" <g0203501@xxxxxxxxxx>
=B9=DE=B4=C2=C0=CC : <si-list@xxxxxxxxxxxxx>

Hello Si-List,

Can someone tell me how to characterize the impulse response of
a multimode fiber ?
Is there any paper available on this topic?

Regards
Ashok



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