# Laser and infrared

**URL:** <https://www.ruby-forum.com/t/laser-and-infrared/205193>\
**Category:** GNU Radio\
**Created:** [March 31, 2011, 4:03pm UTC](https://www.ruby-forum.com/t/laser-and-infrared/205193 "2011-03-31T16:03:42Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![luislavena](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/0ea827/32.png) [@luislavena](https://www.ruby-forum.com/u/luislavena)\
**Post date:** [March 31, 2011, 4:03pm UTC](https://www.ruby-forum.com/t/laser-and-infrared/205193/1 "2011-03-31T16:03:42Z")

</div>

can USRP be useful in a laser related R&D Project , in its vanilla form  
or  
with a commercial/free additional board ? how about on Infrared ? its  
appreciated if any of you guys can point me to possible existing works  
on  
these two subjects based on USRP/GNU Radio  
Regards

---

<div class="post-metadata">

**Author:** ![Mohammad\_H](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/50afbb/32.png) [@Mohammad\_H](https://www.ruby-forum.com/u/Mohammad_H)\
**Post date:** [March 31, 2011, 6:42pm UTC](https://www.ruby-forum.com/t/laser-and-infrared/205193/2 "2011-03-31T18:42:34Z")

</div>

I’m currently using GNU Radio for an application in Visible Light  
Communication, which has similarities to IR. Since both are IM/DD, I  
use the LFTX and LFRX daughter cards with USRP2’s and I’ve been working  
on implementing some baseband modulation techniques. I was also able  
to test with some of the modulation schemes implemented in GNURadio  
using low frequency carriers ( \< 10MHz ) and it has been working pretty  
well.

Basically, I’m using the USRP as a low cost A/D and D/A.

Michael R.  
Graduate Research Assistant  
Smart Lighting Engineering Research Center  
Boston University  
removed\_email\_address@domain.invalid

Quoting Mohammad H. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

---

<div class="post-metadata">

**Author:** ![Mohammad\_H](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/50afbb/32.png) [@Mohammad\_H](https://www.ruby-forum.com/u/Mohammad_H)\
**Post date:** [April 1, 2011, 12:09am UTC](https://www.ruby-forum.com/t/laser-and-infrared/205193/3 "2011-04-01T00:09:26Z")

</div>

We’re using the USRP+GNURadio to do passband modulation of a LED and/or  
laser. We run the signal from the Basic-TX daughterboard into an amp and  
a  
bias-t and then into the laser. At the receiver we take the output  
directly  
into the Basic-RX board. Works pretty well.