[Laser] (no subject)

[Tim Toast]

Very Interesting Yves. I wonder how the sensitivity compares to regular PIN or APDs in the same bandwidth? The bandwidth of the LED detection spectrum looks to be about twice the emission bandwidth (FWHM). I assume the detection bandwidths are similar even without the high voltage bias. They used high power output LEDs for the tests but i wonder how regular LEDs or IR LEDs perform. It was interesting to see that semiconductor lasers have this light detection capability too. I didn't see a graph of the receive bandwidth for lasers but i assume they are much narrower than the LEDs.

I remember back in the early seventies sometime i saw a construction article in a magazine showing an optical transceiver that used an LED as both transmitter and receiver. A red one i think, and it may have been biased in receive mode, but only at 9 volts or whatever the supply voltage was. I had saved the article but can't seem to find it now.