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OPTOELECTRONICS CIRCUIT COLLECtiON By Neil Albaugh
The following collection of analog circuits may be useful in electro-optics applications such as optical networking
systems. This page summarizes their salient characteristics.
Similar to the previous circuit except that it operates from
±5V supplies and it is inverting; i.e., drives from 0A to 2A
into a laser diode with a 0V to –2V input. A very low noise
bipolar input op amp allows this circuit to achieve a low
noise output current, an important consideration in dense
channel spacing systems. As drawn, neither terminal of the
laser diode is grounded.
TEMPERATURE UNDER–AND OVER–RANGE
SENSING WITH A WINDOW COMPARATOR
This circuit is useful to monitor the temperature of a TEC
thermistor, to sense an out-of-range condition, or if the
thermistor is shorted or open. Current sources make the
threshold adjustments non-iterative. The supply voltage is
+5V.
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