Re: APD bias

From: S. hashem Aref (hashem_aref_at_ureach.com)
Date: 10/13/04 

Date: 12 Oct 2004 22:27:59 -0700

John Popelish <jpopelish@rica.net> wrote in message news:<416BF366.1E9CD867@rica.net>...
> "S. hashem Aref" wrote:
>
> > thanks,
> > When I run it with Vr=5v and illuminated it with laser diode @1550nm
> > and power=1.5mw I saw a very low voltage in output of load resistance
> > (RL=100 ohm) that voltage was about .04mv.
> > If you want to look at my circuit I can attach for you.
>
> If you have a silicon APD, it is almost completely transparent to 1550
> nm. You will need an indium gallium arsenide (InGaAs) oe germanium or
> other narrow band gap material to detect 1550.

My APD is Ge type. I used it in a simple circuit for reverse bise with
5v
becease its data*** say that Vr=5v. My be I have some mistakes in
biase circuit. I show the circuit in below.

                           APD
                  |--------<|-------|
                  | *
                  | * RL=100 ohm
                  | *
                  | C=850pf |
                  |------||---------|
                  | |
                  | R=100 ohm |
                  --****------|I----
                             + -
                              V=5v

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