What Is a Light Detector?

The light detector, also known as the "light detector", is the first part of the optical receiver and an important part of the optical fiber sensor. Its performance index will directly affect the performance of the sensor.

Photodetector

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The light detector, also known as the "light detector", is the first part of the optical receiver and an important part of the optical fiber sensor. Its performance index will directly affect the performance of the sensor.
Chinese name
Photodetector
Types of
Heat detector
Nature
science
Category
physical
The photodetector can detect the light power incident on the surface, and convert the change of this light power into the corresponding current. Due to the loss and distortion of the optical signal in the optical fiber, the performance of the photodetector is very high. The most important requirements are high sensitivity, low noise in the wavelength range of the light source used, and fast response speed to adapt to speed transmission.
Light detectors generally meet the following requirements:
(1) High quantum efficiency in the range of wavelengths required for system operation;
(2) Fast response speed;
(3) Has good linear input-output properties;
(4) Can work reliably under normal conditions.
Photomultiplier tubes, pyroelectric detectors, semiconductor photodetectors, etc.

Photodetector photomultiplier tube

It consists of a photocathode and a multiplier installed in a vacuum tube. It has high gain and low noise, but it is large in size and requires a high bias voltage, which is not suitable for optical fiber communication systems.

Photodetector pyroelectric detector

Including the conversion from thermal energy to light energy, the response of this detector is flat in a relatively wide spectral range, but the response speed is very slow and it is not suitable for optical fiber communication systems.

Photodetector semiconductor photodetector

Photodiodes in semiconductor photodetectors are small in size, high in flexibility, and fast in response. They are widely used in fiber optic communication systems. There are two common photodiodes: PIN photodiodes and avalanche photodiodes (APD)

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