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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 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 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.
Links to electronic
circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
A Thermoelectric Cooler Temperature Controller for Fiber Optic Lasers: AN89
Linear Technology This application note presents circuitry for maintaining 0.01°C temperature control of fiber optic lasers over wide ambient
range variations. The circuitry also features high efficiency power delivery, compact size and low noise. Detailed descriptions of circuitry
and results are given with special emphasis on rmal loop optimization. An appended section covers practical considerations for rmoelectric
cooler-based control loops.
Current Sources for Fiber Optic Lasers: AN90 Linear Technology A large group
of fiber optic lasers are powered by DC current. Laser drive is supplied by a current source with modulation added to the signal. The current
source, although conceptually simple, constitutes an extraordinarily tricky design problem. There are a number of practical requirements for a
fiber optic current source and failure to consider them can cause laser and/or optical component destruction. This application note describes
ten laser current source circuits with a range of capabilities. High and low current types are presented, along with designs for grounded
anode, cathode or floating operation. Each circuit also includes laser protection features. Appended sections cover laser load simulation and
current source noise measurement techniques.
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