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Protector and protection method of avalanche photodiode (APD)

An avalanche photoelectric and diode technology, which is applied in the direction of emergency protection circuit devices, emergency protection circuit devices, and electrical components for limiting overcurrent/overvoltage, and can solve problems such as reducing Vapd voltage, limited voltage drop range, and APD impact

Inactive Publication Date: 2011-04-13
CHENGDU SUPERXON COMM TECH CO LTD
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AI Technical Summary

Problems solved by technology

The traditional avalanche photodiode protection method is to connect a resistor or a current-limiting diode in series before the avalanche photodiode to reduce the Vapd voltage (bias voltage of the avalanche photodiode). The multiplication factor is M=1, in the case of excessive optical power, it will still have an impact on the APD

Method used

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  • Protector and protection method of avalanche photodiode (APD)
  • Protector and protection method of avalanche photodiode (APD)
  • Protector and protection method of avalanche photodiode (APD)

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Embodiment Construction

[0017] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0018] figure 1 It is a device structure diagram for protecting the avalanche photodiode of the present invention, the boost output terminal of the boost generator is connected with the voltage input terminal of the current monitor through the resistance-capacitance network; the analog-to-digital converter is connected with the current monitoring through the RSSI fast response network connected to the first monitoring output terminal of the device; the second analog-to-digital converter is connected to the second monitoring output terminal of the current monitor through the resistance-capacitance network two; the pulse width generator is connected to the boost generator; the bias of the current monitor The voltage output terminal is connected to the cathode of the avalanche photodiode.

[0019] f...

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Abstract

The invention discloses a protector and protection method of an avalanche photodiode (APD) in a passive optical network (PON) burst mode. A chip with a two-path current monitoring and boosting function is used to provide a bias voltage and current for the APD. A microcontroller capable of pulse width modulation (PWM) and analog-to-digital conversion is used for modulating the voltage and sampling of the APD. A received signal strength indication (RSSI) fast response system is utilized to finish light current sampling and holding in the presence of an ultrashort optical signal. In the invention, based on a principle of automatic control, when the luminous power of the APD is excessively input, a pulser configured by software is used for reducing the output voltage of a power supply chip, so as to reduce the gain current and response current of the power supply chip, thereby preventing the overcurrent damage of the APD.

Description

technical field [0001] The invention relates to the protection technology of the avalanche photodiode, in particular to the protection technology of the avalanche photodiode in the burst mode of the passive optical network. Background technique [0002] APD (Avalanche Photodiode), a photosensitive element used in optical communications. After a reverse bias is applied to the P-N junction of a photodiode made of silicon or germanium, the incident light will be absorbed by the P-N junction to form a photocurrent. Increasing the reverse bias will produce the phenomenon of "avalanche" (that is, the photocurrent increases exponentially), so this kind of diode is called "avalanche photodiode". The traditional avalanche photodiode protection method is to connect a resistor or a current-limiting diode in series before the avalanche photodiode to reduce the Vapd voltage (bias voltage of the avalanche photodiode). The multiplication factor is M=1. In the case of excessive optical po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
Inventor 余涛
Owner CHENGDU SUPERXON COMM TECH CO LTD
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