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Control method and device for providing bias voltage for APD and optical module

A technology of bias voltage and control method, applied in the field of optical modules, which can solve problems such as overshoot, avalanche diode APD damage, etc.

Active Publication Date: 2019-11-12
HISENSE BROADBAND MULTIMEDIA TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This application provides a control method, device and optical module for providing a bias voltage to the APD, so as to solve the problem that the current optical module is prone to overshoot and cause damage to the avalanche diode APD when the power is off.

Method used

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  • Control method and device for providing bias voltage for APD and optical module
  • Control method and device for providing bias voltage for APD and optical module
  • Control method and device for providing bias voltage for APD and optical module

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Embodiment Construction

[0032] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0033] One of the core links of optical fiber communication is the conversion of photoelectric signals. Optical fiber communication uses optical signals carrying information to be transmitted in optical fibers / optical waveguides. Using the passive transmission characteristics of light in optical fibers can achieve low-cost, low-loss informatio...

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Abstract

The invention discloses a control method and device for providing bias voltage for an APD and an optical module. The method comprises the steps of detecting the internal voltage of an MCU; judging whether the MCU is powered down or not according to the internal voltage of the MCU; and if the MCU is powered down, increasing the DAC output level of the MCU so as to reduce the bias voltage provided for the APD. According to the control method for providing the bias voltage for the APD provided by the invention, when the MCU is powered down, the bias voltage is supplied to the APD; the MCU controls the DAC to increase the output level, so that the bias voltage provided for the APD is pulled to a very low level value at the beginning of power failure, and the subsequent overshoot peak value islocated in the safe working range of the APD, thereby playing a role in protecting the APD and avoiding damage of overshoot to the APD; besides, the method provided by the invention only utilizes software to avoid overshoot, does not add extra hardware devices, is low in cost, and is simple and easy to implement.

Description

technical field [0001] The present application relates to the technical field of optical fiber communication, and in particular to a control method, device and optical module for providing bias voltage to an APD. Background technique [0002] The receiving part of the optical module is completed by using an avalanche photodiode (Avalanche Photon Diode, APD) to detect the input light and convert it into a current, but the work of the APD requires a high bias voltage, and the temperature will change the sensitivity of the APD , so this bias voltage needs to follow the temperature change to ensure that the APD can work normally at various temperatures. [0003] With the increasing application of software in the optical module, the bias voltage provided to the APD is controlled by the software inside the optical module. According to different temperatures, the DAC (Digital to analog converter, digital-to-analog converter, ) output different low-voltage levels to the high-voltag...

Claims

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Application Information

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IPC IPC(8): H04B10/25
Inventor 王麟李刚
Owner HISENSE BROADBAND MULTIMEDIA TECH
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