The reverse current (in the absence of light) must be very small, in order to detect very weak optical signals (high sensitivity).
Fast response (high bandwidth).
The noise level generated by the device itself must be minimal.
There are two types of detectors: PIN photodiodes and APD avalanche.
PIN detectors: Its name comes from the fact that they are composed of a PN junction and between that junction, a new zone of intrinsic material (I) is inserted, which improves the efficiency of the detector. It is mainly used in systems that allow easy discrimination between possible light levels and over short distances.
Fiber optic installation jobs
APD detectors: Avalanche photodiodes are photodetectors that show, applying a high reverse voltage, an internal effect of current gain (approximately 100), due to impact ionization (avalanche effect). The mechanism of these detectors consists of launching an electron at high speed (with sufficient energy), against an atom so that it is able to tear out another electron.
These detectors can be classified into three types:
Silicon: they have a low noise level and a performance of up to 90% working in the first window. They require a high supply voltage (200-300 V ).
Germanium: suitable for working with wavelengths between 1000 and 1300 nm and with a yield of 70%.
Function process
Fast response (high bandwidth).
The noise level generated by the device itself must be minimal.
There are two types of detectors: PIN photodiodes and APD avalanche.
PIN detectors: Its name comes from the fact that they are composed of a PN junction and between that junction, a new zone of intrinsic material (I) is inserted, which improves the efficiency of the detector. It is mainly used in systems that allow easy discrimination between possible light levels and over short distances.
Fiber optic installation jobs
APD detectors: Avalanche photodiodes are photodetectors that show, applying a high reverse voltage, an internal effect of current gain (approximately 100), due to impact ionization (avalanche effect). The mechanism of these detectors consists of launching an electron at high speed (with sufficient energy), against an atom so that it is able to tear out another electron.
These detectors can be classified into three types:
Silicon: they have a low noise level and a performance of up to 90% working in the first window. They require a high supply voltage (200-300 V ).
Germanium: suitable for working with wavelengths between 1000 and 1300 nm and with a yield of 70%.
Function process
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