Temperature compensating equipment for avalanche photodiode optical receiver

Abstract

Disclosed is a temperature-compensating device for an APD optical-receiver system using an APD (Avalanche Photo Diode). The device includes a temperature-compensating circuit which employs a digital potentiometer capable of linear compensation through data look-up in compensating the decrease in gain caused by the temperature change of the APD.

Description

technical field [0001] The present invention relates to an optical receiver system, and more particularly, to a temperature compensation device for compensating for temperature-related performance loss in an optical receiving device employing an avalanche photodiode (APD). Background technique [0002] When light is incident on a photodiode and a reverse bias voltage is applied to it in increments, electrons are created and accelerated in a high electric field, causing atoms to collide with each other. As a result, an avalanche phenomenon occurs in which new electrons and holes are generated. Avalanche photodiodes (APDs) are used to convert optical signals into electrical signals and serve as light receiving elements in optical communication systems. In addition, APD has characteristics suitable for use in high-speed digital lines. [0003] Also, APDs have their own gain control and are capable of detecting very low energy levels of light. Therefore, APD is preferred by d...

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Problems solved by technology

In addition, the disadvantage of APD is that its signal-to-noise ratio (S / N) and bias voltage tend to be high and have high temperature dependence due to the current amplification effect caused by the avalanche phenomenon

Furthermore, it is difficult to linearize the resistance value as in Equation 1, which requires the resistance value to be represented by an analog method as a fractional equation

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