From: "Bret Cannon"
Subject: Re: Diode Laser Drive Circuit
Date: Mon, 11 Nov 2002 19:22:31 -0800
Organization: One World Telecommunications
NNTP-Posting-Date: Tue, 12 Nov 2002 03:25:34 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
After a few microseconds of too much current through the laser diode, the
silicon, that is the photo diode, will still be fine, it is the laser that
will be toast, but that is made from a direct bandgap semiconductor like
Bill Sloman wrote in message
> "Alex Cusenza" wrote in message
> > Hello,
> > It's been a while since I posted, but I'm always peaking for interesting
> > articles.
> > Anyway, can someone please explain to me how a driver board functions
> > laser diode. I have a simple differential feedback circuit (very
> > connected with a potentiometer connected to the laser input. As I vary
> > potentiometer, the laser beam varies from dim to bright. WHY? Then,
> > is the purpose for a more fancy driver circuit, that is, higher
> > operation and such?
> > Your input is greatly appreciated.
> The most important bit of information you need to know about laser diodes
> that it is very easy to blown them up.
> The active region is tiny and a few usec of over-current can convert your
> expensive laser diode into junk silicon.
> Do a search of sci.electronics.design on groups.google.com - the subject
> come up before, and one of our reguar posters has a useful web-site.
> Bill Sloman, Nijmegen