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More  Fiber Optic Circuits    Light Detectors
 

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.

Click on Drawing Below to view PDF version of Schematic

Circuit 50MHz Bandwidth Light Probe designed by Dave Johnson, P.E. (June 4, 2000)

More  Fiber Optic Circuits    Light Detectors
 

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