CN112113673B - Spectrum calibration method of optical tunable filter, readable storage medium and device - Google Patents
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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Abstract
The invention provides a spectral calibration method, a readable storage medium and a device of an optical tunable filter, wherein the method comprises the following steps: step 1, determining an optical channel wavelength grid to be calibrated and a working voltage range of a tunable filter, and realizing analog-to-digital conversion on a circuit; step 2, in an initial calibration stage, determining an optical channel as an initial optical channel, scanning all voltage values in a working voltage range, searching for a loss minimum value of the initial optical channel, recording the voltage value corresponding to the loss minimum value as an initial voltage value, and setting a voltage scanning range for the initial optical channel; and 3, in the accurate calibration stage, the initial optical channel is accurately calibrated in the voltage scanning range, then each optical channel in the optical channel wavelength network is sequentially calibrated, and the voltage value of the next optical channel in the previous optical channel calibration is used as the voltage starting point. The method can realize the fast and accurate spectrum calibration of the light tunable filter.
Description
Technical Field
The invention relates to a spectral calibration method of an optical tunable filter, a readable storage medium and equipment.
Background
The optical tunable filter is a photoelectric device applied to the technical field of optical communication, and the central wavelength of an optical channel of the optical tunable filter is controlled by driving voltage, and the optical channel is different under different driving voltages. Different optical channels are selected depending on different voltage changes, and the central wavelength and the voltage of the channels meet a fixed spectral line relation.
However, in the manufacturing process of the tunable optical filter, due to the processing precision error of each optical sub-component and the debugging and assembling error, the wavelength-voltage relation curve deviates from the design curve. Accurate voltage scaling is critical for a set target optical channel wavelength value. Therefore, after the production of the optically tunable filter is completed, separate scaling is required for each product.
At present, a conventional calibration method sets a voltage value step for each wavelength to be calibrated, scans the wavelength at each step point to obtain a spectral line and find the central wavelength of the spectral line, and then compares the spectral line with a target wavelength value. Because the voltage step needs to be as small as possible to obtain high-precision calibration, and a high-precision tunable filter, such as a 25GHz tunable filter, needs to consume a large amount of time for scanning each set voltage value step point due to the large number of channels to be calibrated, and the center wavelength of a conventional channel is often a wavelength value corresponding to a selected spectral line peak, but the calibration result is also inaccurate because the peak insertion loss of the tunable filter is jittered and also changes along with the change of the surrounding environment.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a spectrum calibration method, a computer readable storage medium and a device for an optical tunable filter, which implement fast and accurate spectrum calibration by using a staged calibration method.
The first aspect of the present disclosure provides a method for calibrating a spectrum of an optically tunable filter, including:
step 1, determining an optical channel wavelength grid to be calibrated and a working voltage range of a tunable filter, and realizing analog-to-digital conversion on a circuit;
step 2, in an initial calibration stage, determining an optical channel as an initial optical channel, scanning all voltage values in a working voltage range, searching for a loss minimum value of the initial optical channel, recording the voltage value corresponding to the loss minimum value as an initial voltage value, and setting a voltage scanning range for the initial optical channel;
and 3, in the accurate calibration stage, accurately calibrating the initial optical channel within the voltage scanning range, then sequentially calibrating each optical channel in the optical channel wavelength network, taking the voltage value obtained by the previous optical channel calibration as a voltage starting point for the next optical channel, sequentially scanning the input optical wavelength by each optical channel according to a preset voltage step length until the central wavelength consistent with the optical channel is obtained, and recording the corresponding central wavelength and the corresponding voltage value to finish the calibration of the optical channel.
Further, the precise calibration process of the initial optical channel specifically includes:
a1, selecting a voltage scanning range by taking the initial voltage value as a center;
step a2, sequentially fixing the voltage on each step point in the voltage scanning range;
a3, scanning input light wavelength to obtain a wavelength-insertion loss curve corresponding to voltage;
step a4, calculating the central wavelength according to the wavelength-insertion loss curve;
step a5, comparing the central wavelength with the target optical channel, if the wavelength difference is less than a preset value, reading the current voltage value, recording the current voltage value and the corresponding central wavelength, completing the calibration of the initial optical channel, otherwise, changing the voltage value to the next step length point, and returning to step a 3.
Further, when the optical channel wavelength grid is a fixed grid, the "sequentially scaling each optical channel in the optical channel wavelength grid" specifically includes:
b1, judging whether an uncalibrated optical channel exists, if so, entering the step b2, otherwise, finishing calibration;
step b2, acquiring the next optical channel as the optical channel to be calibrated, and acquiring the voltage value of the last optical channel after the calibration as the voltage starting point;
step b3, fixing the voltage to the next step length point according to the preset voltage step length;
b4, scanning the input light wavelength to obtain a wavelength-insertion loss curve corresponding to the voltage;
b5, calculating the central wavelength according to the wavelength-insertion loss curve;
step b6, comparing the central wavelength with the target optical channel, if the wavelength difference is less than a preset value, reading the current voltage value, recording the current voltage value and the corresponding central wavelength, completing the calibration of the optical channel to be calibrated, returning to step b1, otherwise, returning to step b 3.
Further, when the optical channel wavelength grid is a flexible grid, the "sequentially scaling each optical channel in the optical channel wavelength grid" specifically includes:
step c1, judging whether an uncalibrated optical channel exists, if so, entering step c2, otherwise, ending calibration;
step c2, acquiring a next optical channel as an optical channel to be calibrated, scanning all voltage values in a working voltage range, searching for a loss minimum value of the optical channel to be calibrated, recording the voltage value corresponding to the loss minimum value as the voltage value to be calibrated, and setting a voltage scanning range for the optical channel to be calibrated;
step c3, fixing the voltage to the next step length point according to the preset voltage step length;
step c4, scanning the input light wavelength to obtain a wavelength-insertion loss curve corresponding to the voltage;
step c5, calculating the central wavelength according to the wavelength-insertion loss curve;
and c6, comparing the central wavelength with the target optical channel, reading the current voltage value if the wavelength difference is smaller than a preset value, recording the current voltage value and the corresponding central wavelength, completing the calibration of the optical channel to be calibrated, returning to the c1, otherwise, returning to the c 3.
Further, the searching mode of the center wavelength specifically includes: according to different bandwidth requirements, a slope method is adopted to accurately find two boundary points on the left and the right of the bandwidth of the filter curve, and then a center method or a gravity center method is adopted to obtain the center position according to the two boundary points so as to obtain the center wavelength of the filter curve.
Further, the step 3 further includes: and acquiring corresponding voltage values of all the optical channels to obtain a calibration voltage sequence as a calibration position of the central wavelength of the optical channel, and drawing a relation curve of the central wavelength of the optical channel and the driving voltage to finish calibration.
Furthermore, the same calibration method is adopted for the optical tunable filters at different temperatures.
A second aspect of the present disclosure is to provide a computer-readable storage medium having stored thereon a computer program adapted to be loaded and executed by a processor to implement the steps of the above method.
A third aspect of the present disclosure provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method when executing the program.
The invention has the advantages that:
1. the calibration calculation process is simplified, the calibration process is completed by adopting a staged and regional method, and the calibration efficiency is greatly improved.
2. The method has the advantages that the center wavelength is searched by utilizing a slope method and a center method (or a gravity center method), the problem of peak insertion loss jitter of the tunable filter caused by equipment environment factors such as the precision of an optical power meter can be solved, accurate optical channel calibration can be conveniently carried out from a curve with an unfixed spectrum peak value and an unfixed peak period, the anti-noise capability is strong, and the calibration is more accurate.
3. The method of the invention has simple and convenient execution, strong adaptability, low requirement on the circuit and convenient realization of the circuit.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a basic logic flow diagram of the spectral scaling method of the optically tunable filter of the present invention.
Fig. 2 is a flow chart of the calibration of the initial optical channel in the method of the present invention.
Fig. 3 is a flow chart of scaling of a non-initial optical channel in the method of the present invention.
FIG. 4 is a graph illustrating the calibration effect of the wavelength-voltage curve according to an embodiment of the present invention.
FIG. 5 is a graph illustrating the actual filtering curve of a single wavelength after calibration according to an embodiment of the present invention.
FIG. 6 is a graph of the calibrated multi-wavelength actual filtering curve according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the structure of the present invention is not limited to the following examples.
Referring to fig. 1 to 6, a method for calibrating a spectrum of an optical tunable filter according to the present invention includes:
step 1, determining an optical channel wavelength grid to be calibrated and a working voltage range of a tunable filter, and realizing analog-to-digital conversion on a circuit;
step 2, in an initial calibration stage, determining an optical channel as an initial optical channel (i.e. input light of a tunable light source is fixed on the wavelength of the initial optical channel), scanning all voltage values within a working voltage range, searching for a loss minimum value of the initial optical channel, recording a voltage value corresponding to the loss minimum value as an initial voltage value, and setting a voltage scanning range for the initial optical channel;
and 3, in the accurate calibration stage, accurately calibrating the initial optical channel within the voltage scanning range, then sequentially calibrating each optical channel in the optical channel wavelength network, taking the voltage value obtained by the previous optical channel calibration as a voltage starting point for the next optical channel, sequentially scanning the input optical wavelength by each optical channel according to a preset voltage step length until the central wavelength consistent with the optical channel is obtained, and recording the corresponding central wavelength and the corresponding voltage value to finish the calibration of the optical channel.
Preferably, as shown in fig. 2, the precise calibration process of the initial optical channel specifically includes:
a1, selecting a voltage scanning range by taking the initial voltage value as a center, and self-defining according to different light tunable filters to ensure that the corresponding center wavelength exists in the voltage scanning range;
step a2, sequentially fixing the voltage on each step point in the voltage scanning range;
a3, scanning input optical wavelength to obtain a wavelength-insertion loss curve corresponding to voltage, wherein the linear shape of a filtering curve is different according to different types of tunable optical filters;
step a4, calculating the central wavelength according to the wavelength-insertion loss curve;
step a5, comparing the central wavelength with the target optical channel, if the wavelength difference is less than a preset value, reading the current voltage value, recording the current voltage value and the corresponding central wavelength, completing the calibration of the initial optical channel, otherwise, changing the voltage value to the next step length point, and returning to step a 3.
Preferably, as shown in fig. 3, when the optical channel wavelength grid is a fixed grid (for the tunable filter of the optical channel fixed grid, an equally spaced target channel grid, that is, a fixed grid, is formed), the "sequentially scaling each optical channel in the optical channel wavelength grid" specifically includes:
b1, judging whether an uncalibrated optical channel exists, if so, entering the step b2, otherwise, finishing calibration;
step b2, acquiring the next optical channel as the optical channel to be calibrated, and acquiring the voltage value of the last optical channel after the calibration as the voltage starting point;
step b3, fixing the voltage to the next step length point according to the preset voltage step length;
b4, scanning the input light wavelength to obtain a wavelength-insertion loss curve corresponding to the voltage, wherein the linear shape of the filtering curve is different according to different types of the tunable optical filter;
b5, calculating the central wavelength according to the wavelength-insertion loss curve;
step b6, comparing the central wavelength with the target optical channel, if the wavelength difference is less than a preset value, reading the current voltage value, recording the current voltage value and the corresponding central wavelength, completing the calibration of the optical channel to be calibrated, returning to step b1, otherwise, returning to step b 3.
Preferably, when the optical channel wavelength grid is a flexible grid (for a tunable filter of the optical channel flexible grid, a target channel grid with unequal spacing, that is, a flexible grid, is formed), the "sequentially scaling each optical channel in the optical channel wavelength grid" specifically includes:
step c1, judging whether an uncalibrated optical channel exists, if so, entering step c2, otherwise, ending calibration;
step c2, acquiring a next optical channel as an optical channel to be calibrated, scanning all voltage values in a working voltage range, searching for a loss minimum value of the optical channel to be calibrated, recording the voltage value corresponding to the loss minimum value as the voltage value to be calibrated, and setting a voltage scanning range for the optical channel to be calibrated;
step c3, fixing the voltage to the next step length point according to the preset voltage step length;
step c4, scanning the input light wavelength to obtain a wavelength-insertion loss curve corresponding to the voltage;
step c5, calculating the central wavelength according to the wavelength-insertion loss curve;
and c6, comparing the central wavelength with the target optical channel, reading the current voltage value if the wavelength difference is smaller than a preset value, recording the current voltage value and the corresponding central wavelength, completing the calibration of the optical channel to be calibrated, returning to the c1, otherwise, returning to the c 3.
Preferably, according to different bandwidth requirements, a slope method is adopted to accurately find two boundary points on the left and right of the bandwidth of the filter curve, and then a center method or a gravity center method is adopted to obtain the center position according to the two boundary points, so as to obtain the center wavelength of the filter curve.
Preferably, the step 3 further comprises: and acquiring corresponding voltage values of all optical channels to obtain a calibration voltage sequence as a calibration position of the central wavelength of the optical channel, and drawing a relation curve (shown in figure 4) between the central wavelength of the optical channel and the driving voltage to finish calibration. After the calibration is performed by the method of the present invention, a more accurate calibration result can be obtained, referring to fig. 5 (which is a single channel filter curve obtained after the calibration by the method of the present invention) or fig. 6 (which is a plurality of channel filter curves obtained after the calibration by the method of the present invention);
preferably, the same calibration method is adopted for the optical tunable filters at different temperatures, and the method is only required to be executed again.
Referring back to fig. 1 to 6, a computer-readable storage medium of the present invention stores a computer program, which is suitable for being loaded and executed by a processor to implement the steps of the method.
Referring to fig. 1 to fig. 6, a computer device according to the present invention includes a memory, a processor, and a computer program stored in the memory and running on the processor, and the processor implements the steps of the method when executing the computer program.
Fixing the central wavelength of a channel at the initial stage, scanning a voltage value, and primarily searching a channel voltage calibration value; setting a channel voltage range by combining a tunable filter, scanning wavelength and searching the central wavelength of the channel at different step length points in the small voltage range to perform accurate calibration, realizing rapid high-precision calibration by stages and areas when a grid is fixed, and calibrating by an area range when the grid is flexible. In the process of searching the central wavelength of the channel, a slope method and a gravity center method (or a central method) are adopted to replace a conventional peak value method, so that the calibration error caused by the peak value jitter and the environment is well removed, and the calibration error can be more accurate and closer to the actual peak value position of the channel.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (9)
1. A method for spectral calibration of an optically tunable filter, comprising: the method comprises the following steps:
step 1, determining an optical channel wavelength grid to be calibrated and a working voltage range of a tunable filter, and realizing analog-to-digital conversion on a circuit;
step 2, an initial calibration stage, namely determining an optical channel as an initial optical channel, scanning all voltage values in a working voltage range, searching for a loss minimum value of the initial optical channel, recording the voltage value corresponding to the loss minimum value as an initial voltage value, and setting a voltage scanning range for the initial optical channel, wherein the voltage scanning range is selected by taking the initial optical channel as a center;
and 3, in the accurate calibration stage, accurately calibrating the initial optical channel within the voltage scanning range, then sequentially calibrating each optical channel in the optical channel wavelength network, taking the voltage value obtained by the previous optical channel calibration as a voltage starting point for the next optical channel, sequentially scanning the input optical wavelength by each optical channel according to a preset voltage step length until the central wavelength consistent with the optical channel is obtained, and recording the corresponding central wavelength and the corresponding voltage value to finish the calibration of the optical channel.
2. The method for spectral scaling of an optically tunable filter according to claim 1, wherein:
the precise calibration process of the initial optical channel specifically comprises the following steps:
a1, selecting a voltage scanning range by taking the initial voltage value as a center;
step a2, sequentially fixing the voltage on each step point in the voltage scanning range;
a3, scanning input light wavelength to obtain a wavelength-insertion loss curve corresponding to voltage;
step a4, calculating the central wavelength according to the wavelength-insertion loss curve;
step a5, comparing the central wavelength with the target optical channel, if the wavelength difference is less than a preset value, reading the current voltage value, recording the current voltage value and the corresponding central wavelength, completing the calibration of the initial optical channel, otherwise, changing the voltage value to the next step length point, and returning to step a 3.
3. The method for spectral scaling of an optically tunable filter according to claim 1, wherein: when the optical channel wavelength grid is a fixed grid, the "sequentially scaling each optical channel in the optical channel wavelength grid" specifically includes:
b1, judging whether an uncalibrated optical channel exists, if so, entering the step b2, otherwise, finishing calibration;
step b2, acquiring the next optical channel as the optical channel to be calibrated, and acquiring the voltage value of the last optical channel after the calibration as the voltage starting point;
step b3, fixing the voltage to the next step length point according to the preset voltage step length;
b4, scanning the input light wavelength to obtain a wavelength-insertion loss curve corresponding to the voltage;
b5, calculating the central wavelength according to the wavelength-insertion loss curve;
step b6, comparing the central wavelength with the target optical channel, if the wavelength difference is less than a preset value, reading the current voltage value, recording the current voltage value and the corresponding central wavelength, completing the calibration of the optical channel to be calibrated, returning to step b1, otherwise, returning to step b 3;
the fixed grid is a target channel grid with equal spacing.
4. The method for spectral scaling of an optically tunable filter according to claim 1, wherein: when the optical channel wavelength grid is a flexible grid, the "sequentially scaling each optical channel in the optical channel wavelength grid" specifically includes:
step c1, judging whether an uncalibrated optical channel exists, if so, entering step c2, otherwise, ending calibration;
step c2, acquiring a next optical channel as an optical channel to be calibrated, scanning all voltage values in a working voltage range, searching for a loss minimum value of the optical channel to be calibrated, recording the voltage value corresponding to the loss minimum value as the voltage value to be calibrated, and setting a voltage scanning range for the optical channel to be calibrated;
step c3, fixing the voltage to the next step length point according to the preset voltage step length;
step c4, scanning the input light wavelength to obtain a wavelength-insertion loss curve corresponding to the voltage;
step c5, calculating the central wavelength according to the wavelength-insertion loss curve;
step c6, comparing the central wavelength with the target optical channel, if the wavelength difference is less than a preset value, reading the current voltage value, recording the current voltage value and the corresponding central wavelength, completing the calibration of the optical channel to be calibrated, returning to step c1, otherwise, returning to step c 3;
the flexible grid is a target channel grid with unequal intervals.
5. The method for spectral scaling of an optically tunable filter according to claim 1, wherein: the searching mode of the central wavelength specifically comprises the following steps: according to different bandwidth requirements, a slope method is adopted to accurately find two boundary points on the left and the right of the bandwidth of the filter curve, and then a center method or a gravity center method is adopted to obtain the center position according to the two boundary points so as to obtain the center wavelength of the filter curve.
6. The method for spectral scaling of an optically tunable filter according to claim 1, wherein: the step 3 further comprises: and acquiring corresponding voltage values of all the optical channels to obtain a calibration voltage sequence as a calibration position of the central wavelength of the optical channel, and drawing a relation curve of the central wavelength of the optical channel and the driving voltage to finish calibration.
7. The method for spectral scaling of an optically tunable filter according to claim 1, wherein: the same calibration method is adopted for the optical tunable filters at different temperatures.
8. A computer-readable storage medium, in which a computer program is stored, which program is adapted to be loaded and executed by a processor to perform the steps of the method according to any of claims 1 to 7.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any one of claims 1 to 7 are implemented when the program is executed by the processor.
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