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Optical module receiving end monitoring optical power calibration method

A calibration method and technology for monitoring light, which is applied in the field of optical communication, can solve problems such as the inability to ensure accurate reading of monitoring values, and achieve the effect of expanding the monitoring range and improving monitoring accuracy

Active Publication Date: 2021-03-26
四川华拓光通信股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] d. There is no guarantee that the monitoring value can still be read accurately after LOSA

Method used

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  • Optical module receiving end monitoring optical power calibration method

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Embodiment Construction

[0048] The present invention is described in further detail below, so that those skilled in the art can implement it with reference to the description.

[0049] The calibration method of the present invention is configured to include:

[0050] Step 1. At normal temperature, the module is calibrated to the minimum monitoring power point and maximum monitoring power point that can be monitored, and the routine calibration is performed;

[0051] Step 2: At normal temperature, read the ADC value and MCU temperature value of no light or any other fixed input optical power. The ADC value is represented by the symbol D1, and the temperature value is represented by T1;

[0052] Step 3, at the lowest working temperature point, read the ADC value and MCU temperature value of the same input optical power as normal temperature, the ADC value is represented by the symbol D2, and the temperature is represented by T2;

[0053] Step 4, at the highest working temperature point, read the ADC v...

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Abstract

The invention discloses an optical module receiving end monitoring optical power calibration method, which comprises the steps of 1, selecting three nodes of normal temperature, lowest working temperature and highest working temperature, and calculating a change rate k and a constant b of dark current ADC values along with temperature x from a normal temperature interval to a low temperature interval and from the normal temperature interval to a high temperature interval; and 2, writing the corresponding ADC values into a lookup table based on temperature x according to a function y=kx+b basedon ADC value change rates k and constants b of different temperature intervals. The invention provides an optical module receiving end monitoring optical power calibration method, which comprises thefollowing steps of: reading dark current ADC or reading the optical power used by ADC value variation at a certain fixed optical power point in a lightless state of three external nodes of normal temperature, low temperature and high temperature; and by using the calibration method provided by the invention, the monitoring range can be expanded, and the monitoring precision can be improved.

Description

technical field [0001] The invention relates to the field of optical communication. More specifically, the present invention relates to a calibration method for monitoring optical power at the receiving end of an optical module. Background technique [0002] The optical module converts the electrical signal at the sending end into an optical signal, and after transmission through the optical fiber, the receiving end converts the optical signal into an electrical signal. As the core component of optical communication, it is widely used in data centers, base stations, and switches. There are two commonly used optical receiving components for optical modules, PIN-TIA ROSA and APD-TIA ROSA. The difference is that the sensitivity of the latter is better than that of the former. The former is used for short-distance transmission light reception, and the latter is used for long-distance transmission light reception. [0003] For the receiving end of the optical module, it is nece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/21H04B10/079H04B10/40
CPCH04B17/21H04B10/07955H04B10/40
Inventor 胡仕丹熊伟霖丁征
Owner 四川华拓光通信股份有限公司