CN110703384A - Data processing method of continuously adjustable optical attenuator - Google Patents
Data processing method of continuously adjustable optical attenuator Download PDFInfo
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- CN110703384A CN110703384A CN201910954909.3A CN201910954909A CN110703384A CN 110703384 A CN110703384 A CN 110703384A CN 201910954909 A CN201910954909 A CN 201910954909A CN 110703384 A CN110703384 A CN 110703384A
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
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- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
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Abstract
The invention discloses a data processing method of a continuously adjustable optical attenuator, which relates to the technical field of optical communication and comprises the following steps: acquiring attenuation data by a data acquisition system: the attenuation data comprises the moving number of the stepping motor and the power value of the current high-precision power meter; screening attenuation data acquired by the data acquisition system to obtain a corresponding relation between a pulse value and an actual attenuation value of the stepping motor; an attenuation curve table of the attenuator is prepared. According to the invention, a data acquisition system is set up, and manual measurement is replaced by adopting an automatic control and reading mode, so that the data acquisition efficiency is improved; the acquired data is analyzed, summarized and the attenuation curve is extracted, so that the data is simplified, the data volume of an attenuation table is greatly reduced, the table query processing time is reduced, and the operation efficiency is improved.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a data processing method of a continuously adjustable optical attenuator.
Background
An optical attenuator is an important passive optical device, which can perform expected attenuation on optical signal energy by absorbing or reflecting optical power margin, and is commonly used in system loss evaluation and various tests, and has been widely applied in the field of optical communication.
The optical attenuator can be generally classified into a fixed attenuator, a step-adjustable attenuator, a continuous adjustable attenuator, and the like, and in order to make the attenuation value more accurate, attenuation data of different attenuation points need to be collected to make an attenuation curve comparison table.
However, the traditional continuous adjustable attenuator adopts attenuation data of different attenuation points to prepare an attenuation curve comparison table, the data acquisition workload is very large, and the traditional measuring mode has low efficiency and poor precision. For example, when the attenuation resolution is 0.005dB, 12000 data needs to be acquired for 60dB attenuation, the data size is huge and complicated, the table making of large data size also has adverse effects on the data storage and operation speed, and the traditional measuring mode cannot meet the measurement requirements and the production efficiency requirements, so that a continuously adjustable optical attenuator data processing method is needed.
Disclosure of Invention
The embodiment of the invention provides a data processing method of a continuously adjustable optical attenuator, which is used for solving the problems in the prior art.
A data processing method for a continuously adjustable optical attenuator, comprising the steps of:
acquiring attenuation data by a data acquisition system: the moving number of the stepping motor and the power value of the current high-precision power meter;
screening attenuation data acquired by the data acquisition system to obtain a corresponding relation between a pulse value and an actual attenuation value of the stepping motor;
an attenuation curve table of the attenuator is prepared.
Preferably, the data acquisition system comprises a high-stability light source, a beam splitter, an attenuator to be measured, a high-precision power meter and an upper computer, wherein the high-stability light source is divided into two paths of light sources after passing through the beam splitter, one path of light source enters the high-precision power meter, the upper computer is electrically connected with the high-precision power meter, the high-stability light source and the attenuator to be measured, and the high-precision power meter is used for reading the power value of the beam of light source; and the other path of light source enters the attenuator to be tested, the attenuation is changed by controlling the stepping motor to drive the attenuation sheet, and the moving step number of the stepping motor and the power value of the current high-precision power meter are recorded.
More preferably, the high-stability light source sets the light source wavelength and the power value through a data bus.
More preferably, the beam splitter is an 50/50 beam splitter.
More preferably, in the process of recording the moving steps of the stepping motor and the current power value of the high-precision power meter, when the high-precision power meter monitors and finds that the power of the light source changes, the power value of the high-stability light source is corrected.
More preferably, a stepping motor is adopted in the attenuator to be measured as a driving structure, a continuously attenuated strip-shaped attenuation piece is adopted as an actuating mechanism, when the stepping motor drives the continuously attenuated strip-shaped attenuation piece to move, an incident light power signal is attenuated along with the strip-shaped attenuation piece, an attenuation value is continuously changed along with the attenuation piece, and the attenuation value is set by controlling the stepping motor.
Preferably, when screening the attenuation data acquired by the data acquisition system, the attenuation value of any point x of the attenuation sheet is:
wherein, B, thetabThe high end of the attenuation sheet corresponds to the pulse value and the corresponding attenuation value of the stepping motor; A. thetaaThe low end of the attenuation sheet corresponds to the pulse value of the stepping motor and the corresponding attenuation value; x, thetaxThe pulse value and the corresponding attenuation value of the stepping motor corresponding to any point of the attenuation sheet;
when the wavelength of the incident light changes, the attenuation value of any point x of the attenuation sheet is as follows:
wherein, theta'B、λBThe attenuation value and the attenuation wavelength correspond to the longest attenuation wavelength; theta'A、λAThe attenuation value and the attenuation wavelength corresponding to the shortest attenuation wavelength; theta'x、λXThe attenuation value and the attenuation wavelength correspond to any wavelength for attenuation.
The invention has the beneficial effects that: according to the invention, a data acquisition system is set up, and manual measurement is replaced by adopting an automatic control and reading mode, so that the data acquisition efficiency is improved; the acquired data is analyzed, summarized and the attenuation curve is extracted, so that the data is simplified, the data volume of an attenuation table is greatly reduced, the table query processing time is reduced, and the operation efficiency is improved.
Drawings
FIG. 1 is a block diagram of attenuation data acquisition for a method of processing data for a continuously variable optical attenuator according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a structure of an attenuator to be tested according to a data processing method of a continuously adjustable optical attenuator according to an embodiment of the present invention;
description of reference numerals:
1-input multimode fiber collimator, 2-output multimode fiber collimator, 3-lead screw cavity, 4-strip optical filter, 5-stepping motor, 6-lead screw, 7-mounting platform, 8-positioning block, 9-support column and 10-control button.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, but it should be understood that the scope of the present invention is not limited by the specific embodiments.
The attenuator supported by the invention is a continuous variable optical attenuator controlled by a stepping motor based on a strip-shaped attenuation sheet, and has the advantages of small volume, high response speed and the like corresponding to a common variable attenuator. The invention is used for solving the problem of how to efficiently collect data and manufacturing the attenuation curve comparison table according to the collected data extraction rule so as to improve the efficiency and ensure that the attenuation value is more accurate.
Referring to fig. 1-2, the present invention provides a continuously adjustable optical attenuator data processing method,
the method comprises the following steps:
acquiring attenuation data by a data acquisition system: the moving number of the stepping motor and the power value of the current high-precision power meter;
the data acquisition system comprises a high-stability light source, a beam splitter, an attenuator to be measured, a high-precision power meter and an upper computer, wherein the high-stability light source sets the wavelength and the power value of the light source through a data bus, and the beam splitter is an 50/50 beam splitter. In the process of recording the moving steps of the stepping motor and the power value of the current high-precision power meter, when the high-precision power meter monitors and finds that the power of the light source changes, the power value of the high-stability light source is corrected. The attenuator to be tested adopts a stepping motor as a driving structure, a continuously attenuated strip-shaped attenuation sheet as an actuating mechanism, when the stepping motor drives the continuously attenuated strip-shaped attenuation sheet to move, an incident light power signal is attenuated along with the strip-shaped attenuation sheet, an attenuation value is continuously changed along with the strip-shaped attenuation sheet, and the attenuation value is set by controlling the stepping motor.
The attenuator to be tested comprises a screw rod cavity 3, an input multimode fiber collimator 1 and an output multimode fiber collimator 2 are respectively arranged on two sides in the screw rod cavity 3, a fixed mounting platform 7 is arranged in the middle of the inside of the screw rod cavity 3, a strip-shaped optical filter 4 is mounted on the mounting platform 7, a screw rod 6 is fixed at one end of the strip-shaped optical filter 4, the other end of the screw rod 6 is fixedly connected to the rotating part of a stepping motor 5, the other end of the strip-shaped optical filter 4 is connected with a positioning block 8, the other end of the positioning block 8 is connected with a supporting column 9, a control button 10 is arranged on the screw rod cavity 3, and the stepping.
The strip-shaped optical filter 4 is arranged on the mounting platform 7, and receives a stepping pulse numerical value sent by an upper computer through the stepping motor 5 to finish the back-and-forth movement of the mounting platform 7, so that an attenuation value is changed, the positioning block 8 is used as a reference zero point of attenuation movement, and whether the mounting platform 7 moves to the positioning block 8 or not is detected through the proximity switch, and the mounting platform 7 is prevented from being damaged due to excessive reverse movement.
The high-stability light source is divided into two paths of light sources after passing through the beam splitter, one path of light source enters the high-precision power meter, the upper computer is electrically connected with the high-precision power meter, the high-stability light source and the attenuator to be tested, and the high-precision power meter is used for reading the power value of the beam of light source; and the other path of light source enters the attenuator to be tested, the attenuation is changed by controlling the stepping motor to drive the attenuation sheet, and the moving step number of the stepping motor and the power value of the current high-precision power meter are recorded.
Screening attenuation data acquired by the data acquisition system to obtain a corresponding relation between a pulse value and an actual attenuation value of the stepping motor;
when screening the attenuation data acquired by the data acquisition system, the attenuation value of any point x of the attenuation sheet is as follows:
wherein, B, thetabThe high end of the attenuation sheet corresponds to the pulse value and the corresponding attenuation value of the stepping motor; A. thetaaThe low end of the attenuation sheet corresponds to the pulse value of the stepping motor and the corresponding attenuation value; x, thetaxThe pulse value and the corresponding attenuation value of the stepping motor corresponding to any point of the attenuation sheet;
when the wavelength of the incident light changes, the attenuation value of any point x of the attenuation sheet is as follows:
wherein, theta'B、λBThe attenuation value and the attenuation wavelength correspond to the longest attenuation wavelength; theta'A、λAThe attenuation value and the attenuation wavelength corresponding to the shortest attenuation wavelength; theta'x、λXThe attenuation value and the attenuation wavelength correspond to any wavelength for attenuation.
An attenuation curve table of the attenuator is prepared.
In the case of the example 1, the following examples are given,
the wavelength of the attenuation range of the attenuator is 1200nm-1650nm, and the attenuation of 30dB at the wavelength of 1310nm is set according to the formula (1) and the formula (2).
First, according to the equation (2), 30dB of attenuation at 1310nm is converted into an attenuation value at a reference wavelength of 1200nm,
the attenuation value of theta at 1200nm can be obtainedA＝21.778dB。
The above results are substituted into the formula (1),
the 10389 pulse value is obtained from the step motor, so to ensure that the attenuation is 30dB at 1310nm, the 10389 pulse value is sent to the step motor.
The formula of the reverse thrust is as follows:
according to the backward-pushing formula, the corresponding relation between the attenuation value of any point and the pulse value of the stepping motor can be calculated.
However, in actual detection, since the theoretical calculation is deviated from the actual attenuation value due to the influence of manufacturing and mounting errors of the attenuation strip, it is necessary to calibrate the attenuation data and create an attenuation curve table.
In the case of the example 2, the following examples are given,
referring to fig. 2, at the time of actual data acquisition, attenuation data linearly increases, but the attenuation values deviate within individual intervals (in the figure, the attenuation value 8 represents 0.08dB, the data format and so on).
TABLE 1 relationship between pulse number and attenuation number of stepping motor at reference wavelength
The stepping motor drives the attenuation sheet to move from the reference position, according to the formula (1), the attenuation data linearly increases, namely the stepping motor theoretically advances by 50 stepping pulses, the attenuation value increases by 10, namely 0.1dB, the difference between the current attenuation value and the theoretical value is calculated through the self-control software of the upper computer,
if the error is less than 0.05dB, the pulse value of the stepping motor is directly calculated in the interval according to a linear difference method, and attenuation control is carried out.
If the deviation of the attenuation value is too large due to the film coating, subdividing the interval, namely, reducing the pulse value of the stepping motor and re-measuring the attenuation data. And (3) measuring the attenuation value every time the stepping motor advances for 10 stepping pulses so as to ensure that the attenuation error is less than 0.05 dB. If the sample error is larger than 0.05dB, the attenuation precision of the interval is ensured by performing subdivision test calibration on the interval.
When the wavelength of incident light changes, the attenuation value changes along with the wavelength, and the coating material adopted by the attenuation sheet changes linearly along with the wavelength of the incident light. In order to test linear parameters, the wavelength of incident light ranges from 1200nm to 1650nm, attenuation tests are carried out on the incident light with four different wavelengths of 1200nm, 1310nm, 1550nm and 1700nm, and the test results verify the correctness of the formula (2).
The corresponding relation between any set value in the attenuation range and the pulse value of the stepping motor can be calculated through formulas (3) and (4), the actual deviation is eliminated through an attenuation curve table, the attenuation precision is improved, the data table is simplified through a theoretical formula and is combined, the table is simplified while the precision is ensured, the efficiency is improved, the 12000 data table of test data is simplified to about 600 through the combination of the two, the table is greatly simplified, and the operation efficiency is improved.
In conclusion, the data acquisition system is set up, and the mode of automatic control and reading is adopted to replace manual measurement, so that the data acquisition efficiency is improved; the acquired data is analyzed, summarized and the attenuation curve is extracted, so that the data is simplified, the data volume of an attenuation table is greatly reduced, the table query processing time is reduced, and the operation efficiency is improved.
The above disclosure is only one specific embodiment of the present invention, however, the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (7)
1. A method for processing data of a continuously variable optical attenuator, comprising the steps of:
acquiring attenuation data through a data acquisition system, wherein the attenuation data comprises the moving number of a stepping motor and the power value of a current high-precision power meter;
screening attenuation data acquired by the data acquisition system to obtain a corresponding relation between a pulse value and an actual attenuation value of the stepping motor;
an attenuation curve table of the attenuator is prepared.
2. The data processing method of the continuously adjustable optical attenuator as claimed in claim 1, wherein the data acquisition system comprises a light source, a beam splitter, an attenuator to be measured, a power meter and an upper computer, the light source is divided into two paths of light sources after passing through the beam splitter, one path of light source enters the power meter, the upper computer is electrically connected with the power meter, the light source and the attenuator to be measured, and the power meter is used for reading the power value of the light source; and the other path of light source enters the attenuator to be tested, the attenuation is changed by controlling the stepping motor to drive the attenuation sheet, and the moving step number of the stepping motor and the power value of the current power meter are recorded.
3. The method as claimed in claim 2, wherein the light source sets the light source wavelength and power values via a data bus.
4. The method as claimed in claim 2, wherein said beam splitter is an 50/50 beam splitter.
5. The data processing method as claimed in claim 2, wherein the power value of the light source is corrected when the power meter monitors that the power of the light source changes during the process of recording the number of steps of the step motor and the current power value of the power meter.
6. The data processing method of a continuously adjustable optical attenuator as claimed in claim 2, wherein the attenuator to be measured has a stepping motor as a driving structure and a continuously attenuating strip as an executing mechanism, and when the stepping motor drives the continuously attenuating strip to move, the incident optical power signal is attenuated accordingly, the attenuation value is continuously changed accordingly, and the attenuation value is set by controlling the stepping motor.
7. The data processing method of claim 1, wherein when filtering the attenuation data collected by the data collection system, the attenuation value of any point x of the attenuation slice is:
wherein, B, thetabThe high end of the attenuation sheet corresponds to the pulse value and the corresponding attenuation value of the stepping motor; A. thetaaThe low end of the attenuation sheet corresponds to the pulse value of the stepping motor and the corresponding attenuation value; x, thetaxThe pulse value and the corresponding attenuation value of the stepping motor corresponding to any point of the attenuation sheet;
when the wavelength of the incident light changes, the attenuation value of any point x of the attenuation sheet is as follows:
wherein, theta'B、λBThe attenuation value and the attenuation wavelength correspond to the longest attenuation wavelength; theta'A、λAThe attenuation value and the attenuation wavelength corresponding to the shortest attenuation wavelength; theta'x、λXThe attenuation value and the attenuation wavelength correspond to any wavelength for attenuation.
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