Electro-Optics Technology, Inc.
Electro-Optics Technology, Inc. | 3340 Parkland Ct. Traverse City, MI 49686 USA
eotech.com | sales@eotech.com | 231.935.4044
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Noise Equivalent Power (NEP): A function of responsivity and dark current and is the
minimum optical power needed for an output signal to noise ratio of 1. Dark current is
the current that flows through a reverse biased photodiode even when light is not present,
and is typically on the order of nA. Shot noise (Ishot) is a source of noise generated in
part by dark current; in the case of reversed biased diodes it is the dominant contributor.
Photodiode: Converts photons into a photocurrent.
Resistor: Part of the low-pass filter at the photodiode cathode.
Responsivity: In amps per watt (A/W), responsivity is the current output of the
photodiode for a given input power, and is determined by the diode structure.
Responsivity varies with wavelength and diode material.
Rise Time/Fall Time: Rise Time is the time taken by a signal to change from a specified
low value to a specified high value. Fall Time is the time taken for the amplitude of a
pulse to decrease from a specified value to another specified value. A larger junction
capacitance will slow the detector’s response time.
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