Chapter 5 Common Operating Circuits - THORLABS DET05D2 User Manual

Extended InGaAs Biased Detector

Chapter 5 Common Operating Circuits

The DET Series Detectors are designed according the circuit depicted above.
The detector is reverse biased to produce a linear response with applied input
light. The photocurrent generated is based upon the incident light and
wavelength and can be viewed on the oscilloscope by attaching a load resistance
on the output. The function of the RC Filter is to filter any high frequency noise
from the input supply which may contribute to a noisy output.
Photodetector
-V
GND
Rev A, December 27, 2017
Figure 2 Basic DET Circuit
Feedback
R
F
A
B
Transimpedance Amp
GND
Figure 3 Amplified Detector
Chapter 5: Common Operating Circuits
Out
BNC
R
LOAD
GND
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