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InGaAs Amplified Detector
Chapter 4 Operation
4.1. Theory of Operation
Thorlabs PDA series are ideal for measuring both pulsed and CW light sources.
The PDA10CF(-EC) includes a reverse-biased PIN photo diode, mated to a fixed
gain transimpedance amplifier, and packaged in a rugged housing.
Photodetector
-V
GND
4.2. Responsivity
The responsivity of a photodiode can be defined as a ratio of generated
photocurrent (I
PD
Page 4
Feedback
A
B
Transimpedance Amp
GND
) to the incident light power (P) at a given wavelength:
R
F
Out
Chapter 4: Operation
BNC
R
LOAD
GND
13122-D02
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