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A method for adjusting the gain of an optical receiver

A technology for optical receiver and gain adjustment, which is applied in electromagnetic receivers, electrical components, electromagnetic wave transmission systems, etc., can solve problems such as unsatisfactory results and increased workload, and achieve AGC gain, low cost, and solution adjustment inflexible effect

Active Publication Date: 2021-06-25
SHENZHEN C-DATA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Using the ONU to manage the optical receiver CATV, you can view the parameters of the optical receiver CATV and set some parameters of the optical receiver CATV, but the setting of the AGC gear is often a sampling fixed state, that is, one AGC gear is a program, If the current AGC state cannot meet the customer's needs, it is necessary to modify the AGC state in the program and then burn it for testing. Repeating this will increase the workload of both parties and often fail to achieve satisfactory results.

Method used

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  • A method for adjusting the gain of an optical receiver

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Embodiment 1

[0019] This embodiment provides a method for adjusting the gain of an optical receiver, which is to adjust the AGC gain through the AGC chip in the optical receiver, and the method for adjusting the gain includes the following steps:

[0020] First, perform step S1: use the analog voltage to measure the corresponding voltage value in the control range of the AGC chip in the optical receiver according to the hardware, and calculate its corresponding pwm duty cycle according to the measured voltage value; wherein, the AGC chip is an amplifying With the integrated AGC circuit, it is used to adjust the AGC gain of the optical receiver, and the pwm duty cycle is calculated according to the ratio of the measured voltage value and the power supply voltage value.

[0021] Then, step S2: each pwm duty cycle is converted into a corresponding pwm count value, and the pwm count value is calculated according to the pwm frequency provided by the pwm duty cycle and the AGC chip in the optical...

Embodiment 2

[0026] This embodiment also provides another method for adjusting the gain of an optical receiver, such as figure 1 As shown, it is on the basis of Embodiment 1, that is, on the basis of AGC gain adjustment, ATT gain adjustment is added. Through the added ATT gain adjustment, more accurate gain adjustment can be achieved, and the adjustment effect is better.

[0027] Among them, in step S1, in addition to using the analog voltage to measure the corresponding voltage value within the control range of the AGC chip in the optical receiver according to the hardware, the analog voltage is also used to measure the corresponding voltage value of the AGC chip in the optical receiver according to the ATT attenuation interval parameter , where the ATT attenuation interval parameter has been set before using the analog voltage to measure the voltage value, and the ATT attenuation interval parameter generally adopts 0.5dB.

[0028]And, in step S3, when writing the AGC range that needs gai...

Embodiment 3

[0035] On the basis of Embodiment 1 and Embodiment 2, this embodiment provides yet another gain adjustment method for an optical receiver, wherein, in step S3, the AGC range that needs gain is written in the web page of the ONU or the serial port of the ONU is a fixed value; and, before step S3, the ATT attenuation value of the optical receiver is also set, and, in step S3, the set ATT attenuation value is written and sent to the optical receiver. In this way, the fixed pwm count value can be realized to adjust the AGC gain. At this time, the adjustment of different gains under the same light can be realized by setting the ATT attenuation value; and the interval between each pwm count value means 0.25dBm The input light also represents a 0.5dB attenuation gain.

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Abstract

The invention discloses a method for adjusting the gain of an optical receiver. Step S1: measure the voltage value corresponding to the gain attenuation value of the AGC chip in the optical receiver, and inversely calculate the corresponding pwm duty cycle; step S2: convert each The pwm duty cycle is converted into the pwm count value and arranged in order to obtain the corresponding pwm count value array in the AGC control chip range; Step S3: write the AGC range that needs gain in the web page of the ONU or the serial port of the ONU; Step S4: Judging that the written AGC range is within the control range of the AGC chip; step S5: performing AGC gain adjustment according to the gain pwm count value array. The present invention can write the AGC range in the webpage of the ONU or the serial port of the ONU, transmit it to the optical receiver through iic communication, and realize the gain adjustment function of the AGC of the optical receiver quickly and accurately.

Description

technical field [0001] The invention relates to the field of computer software, in particular to a method for adjusting the gain of an optical receiver. Background technique [0002] At present, EPON, GPON, and XPON technologies have become the technical standards of telecom operators' access networks, and EPON, GPON, XPON+CATV bidirectional networks have become the mainstream of ONUs with optical receivers in FTTX. The core functions of optical receivers CATV are AGC and The function of ATT, AGC is automatic gain control, which is defined as automatic gain control. Its function means that the overall gain of the optical receiver is controlled by the received optical power. No matter how it changes within the specified optical power control range, it can Keep the output level basically unchanged. ATT stands for attenuator, which is defined as an attenuator, which controls the overall gain attenuation of the optical receiver by inputting the attenuation parameter, and will u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/69
CPCH04B10/6931
Inventor 林桂勇丁令武唐子坚
Owner SHENZHEN C-DATA TECH CO LTD
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