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BROAD BAND 5MHz
OPTICAL FIBER RECEIVER
This circuit is a simple broad band light detector that uses a very
inexpensive IC and a PIN photodiode that is packaged for use with plastic
optical fibers. It has a bandwidth from 1KHz to over 5MHz. It is great for
experimenting with various modulated light sources.
BROAD BAND 2MHz
OPTICAL FIBER RECEIVER
If you need more sensitivity than the above circuit this circuit provides
about ten times more gain. It too is designed around an inexpensive plastic
optical fiber detector.
BROAD BAND 50MHz OPTICAL FIBER
RECEIVER VERSION A
If the above circuit it still too slow, you can try this circuit. What it lacks in
sensitivity it makes up for in speed. The circuit attaches a plastic fiber optic PIN
photodiode assembly to a small box containing a small 3v battery and a standard BNC
plug. When the box is plugged into to the input of an oscilloscope with a 50-ohm
termination resistor, it can detect light pulse frequencies beyond 100MHz.
LIGHT RECEIVER WORKS FROM 1KHz
TO OVER 70MHz
This circuit uses one tiny C-MOS inverter IC to form a modulated light receiver with a
very fast response. It is designed around a PIN photo diode that is packaged for use
with plastic optical fibers. It can be used as an optical fiber receiver. By using the
open end of the optical fiber it can "sniff" out any modulated light signals.
