Table of Contents
What type of semiconductor is used for photo detection?
Semiconductor photodetectors, commonly referred to as photodiodes, are the predominant types of photodetectors used in optical communication systems because of their small size, fast detection speed, and high detection efficiency.
How many types of optical detectors you know and what are they?
The three broad categories of devices are photodiodes, photoconductors, and junction photodetectors.
What are the requirements of a photodetector give different types of photo detectors?
Depending on the application, a photodetector has to fulfill various requirements: It must be sensitive in a certain spectral region (range of optical wavelengths). In some cases, the responsivity should be constant or at least well defined within some wavelength range.
What is the difference between PN photodiode and PIN photodiode?
A PN junction photodiode is made of two layers namely p-type and n-type semiconductor whereas PIN photodiode is made of three layers namely p-type, n-type and intrinsic semiconductor.
What is photodiode and its types?
Introduction. A photodiode is a p-n junction or pin semiconductor device that consumes light energy to generate electric current. It is also sometimes referred as photo-detector, photo-sensor, or light detector. Photodiodes are specially designed to operate in reverse bias condition.
What is the difference between PIN photodiode and avalanche photodiode?
The main advantage of the APD is that it has a greater level of sensitivity compared to PIN. The avalanche action increases the gain of the diode many times, providing much higher sensitivity. However, an APD requires a higher operating voltage.
What is the optical detector used in OTDR?
An OTDR combines a laser source and a detector to provide an inside view of the fiber link. The laser source sends a signal into the fiber where the detector receives the light reflected from the different elements of the link.
How many types of photodiode are there?
There are four types of photodiodes and they are: PN photodiode: The first photodiode to be developed was PN photodiode. This photodiode finds application in many instances. Within the depletion area, the detection of the photo takes place.
What are difference between PIN and APD photodiodes?
What are two uses of photo diode?
Photodiodes are used in safety electronics such as fire and smoke detectors. Photodiodes are used in numerous medical applications. They are used in instruments that analyze samples, detectors for computed tomography and also used in blood gas monitors. Photodiodes are used in solar cell panels.