A method of calibrating an optical module

Abstract

The application aims to provide a method for calibrating an optical module, comprising: obtaining original ADC of optical power and original optical power of the optical module to be calibrated within a calibration range; preprocessing the original ADC of optical power and the original optical power to obtain collected power values and original power values respectively; determining standard calibration errors of each point within the calibration range based on the original power values and the collected power values; selecting multiple groups of initial calibration points based on the calibration range; for each group of initial calibration points, determining initial calibration errors of each initial calibration point based on the collected power values and the original power values of the calibration points; determining calibration coefficients and calibration points based on the difference between the standard calibration errors and the initial calibration errors; and calibrating the obtained actual ADC of optical power into actual optical power based on the calibration points and the calibration coefficients. The method can effectively improve the calibration accuracy of the optical module and greatly improve the performance of the optical module.

Description

Technical Field

[0001] This invention relates to the field of optical module technology, and more specifically, to a method for calibrating optical modules. Background Technology

[0002] An optical module is a compact, miniaturized, and efficient optical communication component that provides photoelectric-to-electro-optical conversion. It mainly consists of functional circuits, optical devices, optical interfaces, and necessary structural components. In practical applications, optical modules can calibrate received digital monitoring data (such as ADC data) into data usable for analysis and processing. Because errors exist in the conversion and calibration process, it is necessary to reduce these errors to obtain more accurate data. Existing methods for reducing errors include good PCB layout of the optical module, using RSSI output devices with higher stability, and designing a well-designed RSSI low-pass filter. In mass production, methods such as increasing the decoupling capability of the optical module's RSSI power supply, increasing the capacitance of the RSSI low-pass filter, using an MCU to digitally filter the acquired RSSI, or using more calibration points when calculating calibration coefficients can improve calibration accuracy. However, in most mass production scenarios, even with the adoption of technologies such as better RSSI low-pass filters, larger RSSI power supply decoupling, better digital filtering, and more calibration points, the calibration accuracy cannot be effectively improved further. Redesigning or replacing RSSI devices with those offering better output stability would increase time and money costs, and it is not possible to guarantee that the calibration accuracy will be further improved after the design is completed. Summary of the Invention

[0003] In view of this, the present invention proposes a method for calibrating optical modules, which can effectively improve the calibration accuracy of optical modules and greatly enhance their performance.

[0004] The present invention aims to provide a method for calibrating an optical module, comprising: acquiring the original optical power ADC and the original optical power of the optical module to be calibrated within a calibration range; preprocessing the original optical power ADC and the original optical power to obtain a sampled power value and an original power value, respectively; determining a standard calibration error for each point within the calibration range based on the original power value and the sampled power value; selecting multiple sets of initial calibration points based on the calibration range; for each set of initial calibration points, determining an initial calibration error for each set of initial calibration points based on the sampled power value and the original power value of the calibration point; wherein the sampled power value of the calibration point is the value at the initial calibration point in the sampled power value, and the original power value of the calibration point is the value at the initial calibration point in the original power value; determining a calibration coefficient and a calibration point based on the difference between the standard calibration error and the initial calibration error; and calibrating the acquired optical power ADC to the actual optical power based on the calibration point and the calibration coefficient.

[0005] Further, determining the standard calibration error includes: obtaining standard calibration coefficients based on the acquired power value and the original power value; the standard calibration coefficients include a first standard calibration coefficient, a second standard calibration coefficient, a third standard calibration coefficient, and a fourth standard calibration coefficient; obtaining a calibrated standard power value based on the acquired power value and the standard calibration coefficients; determining a standard correction error based on the minimum value among the original power values ​​and the minimum value among the calibrated standard power values; determining a standard intermediate calibration coefficient based on the standard correction error and the standard calibration coefficients; the standard intermediate calibration coefficients include a first standard intermediate calibration coefficient, a second standard intermediate calibration coefficient, a third standard intermediate calibration coefficient, and a fourth standard intermediate calibration coefficient; determining a standard intermediate calibration optical power value based on the acquired power value and the intermediate standard calibration coefficients; and determining the standard calibration error based on the standard intermediate calibration optical power value and the original power value.

[0006] Furthermore, the standard correction error is the difference between the minimum value among the original power values ​​and the minimum value among the calibrated standard power values; the standard calibration error is the difference between the standard intermediate calibrated optical power value and the original power value.

[0007] Further, determining the initial calibration error includes: obtaining initial calibration coefficients based on the power values ​​acquired at calibration points and the original power values ​​at calibration points; the initial calibration coefficients include a first initial calibration coefficient, a second initial calibration coefficient, a third initial calibration coefficient, and a fourth initial calibration coefficient; obtaining a calibrated initial power value based on the power values ​​acquired at calibration points and the initial calibration coefficients; determining an initial correction error based on the minimum value among the original power values ​​at calibration points and the minimum value among the calibrated initial power values; determining initial intermediate calibration coefficients based on the initial correction error and the initial calibration coefficients; the initial intermediate calibration coefficients include a first initial intermediate calibration coefficient, a second initial intermediate calibration coefficient, a third initial intermediate calibration coefficient, and a fourth initial intermediate calibration coefficient; determining an initial intermediate calibration optical power value based on the power values ​​acquired at calibration points and the intermediate initial calibration coefficients; and determining the initial calibration error based on the initial intermediate calibration optical power value and the original power values ​​at calibration points.

[0008] Furthermore, the initial correction error is the difference between the minimum value among the original power values ​​at the calibration point and the minimum value among the initial power values ​​after calibration; the initial calibration error is the difference between the initial intermediate calibration optical power value and the original power value at the calibration point.

[0009] Furthermore, a three-stage coefficient calibration is employed, and the standard calibration coefficients and the initial calibration coefficients are solved using the least squares method.

[0010] Furthermore, the expressions for obtaining the calibrated standard power value and the calibrated initial power value are as follows:

[0011] iCald_Sample l

[0012] =iCoe_3·(Raw_Sample l ) 3 +iCoe_2·(Raw_Sample l ) 2 +iCoe_1·Raw_Sample l +iCoe_0

[0013] Among them, iCald_Sample l This represents the calibrated standard power value. iCoe_3 represents the first standard calibration coefficient, iCoe_2 represents the second standard calibration coefficient, iCoe_1 represents the third standard calibration coefficient, and iCoe_0 represents the fourth standard calibration coefficient. Raw_Sample l The value represents the power collected, l represents the selected collection point, and the value ranges from 1 to M, where M represents the total number of collection points within the range.

[0014] nCald_Sample j

[0015] =niCoe_3·(Raw_Sample j ) 3 +niCoe_2·(Raw_Sample j ) 2 +niCoe_1·Raw_Sample j +niCoe_0 where, nCald_Sample j This represents the initial power value after calibration. `niCoe_3` represents the first initial calibration coefficient, `niCoe_2` represents the second initial calibration coefficient, `niCoe_1` represents the third initial calibration coefficient, and `niCoe_0` represents the fourth initial calibration coefficient. `Raw_Sample` j The value represents the power value collected at the calibration point, j represents the selected initial calibration point, and the value ranges from 1 to N, where N represents the total number of initial calibration points.

[0016] Furthermore, the expressions for the standard correction error and the initial correction error are obtained as follows:

[0017] Rec_Coe1 = min(Raw_Sample) l )-min(iCald_Sample l )

[0018] Where Rec_Coe1 represents the standard correction error, min(Raw_Sample) l ) represents the minimum value among the original power values, min(iCald_Sample) l () indicates the minimum value among the calibrated standard power values;

[0019] Rec_Coe2 = min(Raw_Sample) j )-min(nCald_Sample j )

[0020] Where Rec_Coe2 represents the initial correction error, min(Raw_Sample) j () represents the minimum value among the original power values ​​at the calibration point, min(nCald_Sample) j ) represents the minimum value among the initial power values ​​after calibration.

[0021] Furthermore, the expressions for the standard intermediate calibration coefficient and the initial intermediate calibration coefficient are determined as follows:

[0022] fCoe_3=iCoe_3

[0023] fCoe_2=iCoe_2

[0024] fCoe_1=iCoe_1

[0025] fCoe_0=Rec_Coe1

[0026] Where fCoe_3 represents the first standard intermediate calibration coefficient, fCoe_2 represents the second standard intermediate calibration coefficient, fCoe_1 represents the third standard intermediate calibration coefficient, fCoe_0 represents the fourth standard intermediate calibration coefficient, iCoe_3 represents the first standard calibration coefficient, iCoe_2 represents the second standard calibration coefficient, iCoe_1 represents the third standard calibration coefficient, and Rec_Coe1 represents the standard correction error.

[0027] nfCoe_3=niCoe_3

[0028] nfCoe_2=niCoe_2

[0029] nfCoe_1=niCoe_1

[0030] nfCoe_0=Rec_Coe2

[0031] Wherein, nfCoe_3 represents the first initial intermediate calibration coefficient, nfCoe_2 represents the second initial intermediate calibration coefficient, nfCoe_1 represents the third initial intermediate calibration coefficient, nfCoe_0 represents the fourth initial intermediate calibration coefficient, niCoe_3 represents the first initial calibration coefficient, niCoe_2 represents the second initial calibration coefficient, niCoe_1 represents the third initial calibration coefficient, and Rec_Coe2 represents the initial correction error.

[0032] Furthermore, the calibration coefficient and the calibration point are the calibration coefficient and initial calibration point corresponding to the selected calibration error; the selected calibration error is the initial calibration error whose difference from the standard calibration error is less than 0.1dB.

[0033] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0034] The methods for calibrating optical modules provided in some embodiments of the present invention can effectively improve the calibration accuracy of optical modules (calibration accuracy ≤ ±0.5dB) and greatly improve the performance of optical modules. Attached Figure Description

[0035] Figure 1 This is an exemplary flowchart of a method for calibrating an optical module, provided for some embodiments of the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Figure 1 This is an exemplary flowchart illustrating a method for calibrating an optical module, provided for some embodiments of the present invention. Figure 1 As shown, process 100 may include the following:

[0038] Step 110: Obtain the original ADC and original optical power of the optical module to be calibrated within the calibration range.

[0039] The optical module to be calibrated refers to the optical module that needs to be calibrated. The calibration range can be -6 to -46 dBm. Raw optical power ADC and raw optical power can refer to two different ways of representing optical power. Raw optical power ADC can be used for data transmission; raw optical power can be used for data analysis and processing. For example, for raw optical power ADC, the acquired optical power can be represented as a number between 0 and 2047; for raw optical power, the optical power can be represented as an actual power value in dBm. Raw optical power ADC and raw optical power can be obtained through various feasible methods. In some embodiments, M sets of corresponding raw optical power ADCs and raw optical powers can be obtained in 1 dB steps, that is, the dynamic calibration range is M dB. For example, M = 41, indicating that its dynamic calibration range is 41 dB.

[0040] Step 120: Preprocess the original optical power ADC and the original optical power to obtain the acquired power value and the original power value, respectively.

[0041] The acquired power value can refer to the quantized raw optical power ADC. The raw power value can refer to the quantized raw optical power. In some embodiments, the preprocessing involves processing the raw optical power ADC and the raw optical power according to the SFF-8472 protocol to obtain the acquired power value and the raw power value in 0.1uW units.

[0042] Step 130: Based on the original power value and the acquired power value, determine the standard calibration error for each point within the calibration range.

[0043] Standard calibration error can be used to represent the overall error between the original optical power ADC and the original optical power.

[0044] In some embodiments, determining the standard calibration error includes:

[0045] Based on the acquired power value and the original power value, standard calibration coefficients are obtained; the standard calibration coefficients include a first standard calibration coefficient, a second standard calibration coefficient, a third standard calibration coefficient, and a fourth standard calibration coefficient. In some embodiments, a third-order coefficient calibration is used, and the standard calibration coefficients are solved using the least squares method. Specifically, the expression for the standard calibration coefficient solution function is:

[0046]

[0047] Where iCoe_3 represents the first standard calibration coefficient, iCoe_2 represents the second standard calibration coefficient, iCoe_1 represents the third standard calibration coefficient, and iCoe_0 represents the fourth standard calibration coefficient. Raw_Sample l Raw_RSSI represents the power value collected. l The value represents the original power value, l represents the selected sampling point, and the value ranges from 1 to M, where M represents the total number of sampling points within the range.

[0048] Based on the acquired power value and the standard calibration coefficient, a calibrated standard power value is obtained. In some embodiments, the expression for obtaining the calibrated standard power value is:

[0049] iCald_Sample l

[0050] =iCoe_3·(Raw_Sample l ) 3 +iCoe_2·(Raw_Sample l ) 2 +iCoe_1·Raw_Sample l +iCoe_0

[0051] Among them, iCald_Sample l This represents the calibrated standard power value. iCoe_3 represents the first standard calibration coefficient, iCoe_2 represents the second standard calibration coefficient, iCoe_1 represents the third standard calibration coefficient, and iCoe_0 represents the fourth standard calibration coefficient. Raw_Sample l The value represents the power collected, l represents the selected collection point, and the value ranges from 1 to M, where M represents the total number of collection points within the range.

[0052] A standard correction error is determined based on the minimum value among the original power values ​​and the minimum value among the calibrated standard power values. In some embodiments, the standard correction error is the difference between the minimum value among the original power values ​​and the minimum value among the calibrated standard power values. Specifically, the expression for determining the standard correction error is:

[0053] Rec_Coe1 = min(Raw_Sample) l )-min(iCald_Sample l )

[0054] Where Rec_Coe1 represents the standard correction error, min(Raw_Sample) l ) represents the minimum value among the original power values, min(iCald_Sample) l ) represents the minimum value among the calibrated standard power values.

[0055] Based on the standard correction error and the standard calibration coefficients, standard intermediate calibration coefficients are determined; the standard intermediate calibration coefficients include a first standard intermediate calibration coefficient, a second standard intermediate calibration coefficient, a third standard intermediate calibration coefficient, and a fourth standard intermediate calibration coefficient. In some embodiments, the expression for determining the standard intermediate calibration coefficients is:

[0056] fCoe_3=iCoe_3

[0057] fCoe_2=iCoe_2

[0058] fCoe_1=iCoe_1

[0059] fCoe_0=Rec_Coe1

[0060] Where fCoe_3 represents the first standard intermediate calibration coefficient, fCoe_2 represents the second standard intermediate calibration coefficient, fCoe_1 represents the third standard intermediate calibration coefficient, fCoe_0 represents the fourth standard intermediate calibration coefficient, iCoe_3 represents the first standard calibration coefficient, iCoe_2 represents the second standard calibration coefficient, iCoe_1 represents the third standard calibration coefficient, and Rec_Coe1 represents the standard correction error.

[0061] Based on the acquired power value and the intermediate standard calibration coefficient, the standard intermediate calibration optical power value is determined. Specifically, the expression for determining the standard intermediate calibration optical power value is:

[0062] fCald_Sample l =fCoe_3·(Raw_Sample l ) 3+fCoe_2·(Raw_Sample l ) 2 +fCoe_1·Raw_Sample l +fCoe_0

[0063] Among them, fCald_Sample l fCoe_3 represents the first standard intermediate calibration optical power value, fCoe_2 represents the second standard intermediate calibration coefficient, fCoe_1 represents the third standard intermediate calibration coefficient, and fCoe_0 represents the fourth standard intermediate calibration coefficient.

[0064] The standard calibration error is determined based on the standard intermediate calibration optical power value and the original power value. In some embodiments, the standard calibration error is the difference between the standard intermediate calibration optical power value and the original power value. Specifically, the formula for determining the standard calibration error is:

[0065] Fit_Error l =fCald_Sample l -Raw_RSSI l

[0066] Among them, Fit_Error l This indicates the standard calibration error.

[0067] Step 140: Select multiple sets of initial calibration points based on the calibration range.

[0068] The initial calibration point can refer to a selected calibration point, such as a point selected from multiple sampling points in the collected power values. In some embodiments, a preset number of initial calibration points can be selected multiple times to obtain multiple sets of initial calibration points. The preset number can be preset or randomly determined. For example, the preset number can be 1 to N, where N is the total number of sampling points with collected power values ​​within the calibration range.

[0069] Step 150: For each group of initial calibration points, determine the initial calibration error for each initial calibration point based on the power value acquired at the calibration point and the original power value at the calibration point. The power value acquired at the calibration point is the value at the initial calibration point among the acquired power values, and the original power value at the calibration point is the value at the initial calibration point among the original power values.

[0070] Initial calibration error can be used to represent the overall error between the power value acquired at the calibration point and the original power value at the calibration point.

[0071] In some embodiments, determining the initial calibration error includes:

[0072] Based on the power values ​​collected at the calibration point and the original power values ​​at the calibration point, initial calibration coefficients are obtained; these initial calibration coefficients include a first initial calibration coefficient, a second initial calibration coefficient, a third initial calibration coefficient, and a fourth initial calibration coefficient. In some embodiments, a three-stage coefficient calibration is employed, and the initial calibration coefficients are solved using the least squares method. Specifically, the expression for the initial calibration coefficient solution function is:

[0073]

[0074] Where niCoe_3 represents the first initial calibration coefficient, niCoe_2 represents the second initial calibration coefficient, niCoe_1 represents the third initial calibration coefficient, niCoe_0 represents the fourth initial calibration coefficient, j represents the selected initial calibration point, and the value ranges from 1 to N, where N represents the total number of initial calibration points.

[0075] Based on the power value acquired at the calibration point and the initial calibration coefficient, a calibrated initial power value is obtained. In some embodiments, the expression for obtaining the calibrated initial power value is:

[0076] nCald_Sample j =niCoe_3·(Raw_Sample j ) 3 +niCoe_2·Raw_Sample j ) 2 +niCoe_1·Raw_Sample j +niCoe_0

[0077] Among them, nCald_Sample j This represents the initial power value after calibration. `niCoe_3` represents the first initial calibration coefficient, `niCoe_2` represents the second initial calibration coefficient, `niCoe_1` represents the third initial calibration coefficient, and `niCoe_0` represents the fourth initial calibration coefficient. `Raw_Sample` j The value represents the power value collected at the calibration point, j represents the selected initial calibration point, and the value ranges from 1 to N, where N represents the total number of initial calibration points.

[0078] An initial correction error is determined based on the minimum value among the original power values ​​at the calibration point and the minimum value among the initial power values ​​after calibration. In some embodiments, the initial correction error is the difference between the minimum value among the original power values ​​at the calibration point and the minimum value among the initial power values ​​after calibration. Specifically, the expression for determining the initial correction error is:

[0079] Rec_Coe2 = min(Raw_Sample) j )-min(nCald_Samplej )

[0080] Where Rec_Coe2 represents the initial correction error, min(Raw_Sample) j () represents the minimum value among the original power values ​​at the calibration point, min(nCald_Sample) j ) represents the minimum value among the initial power values ​​after calibration.

[0081] Based on the initial correction error and the initial calibration coefficients, initial intermediate calibration coefficients are determined; the initial intermediate calibration coefficients include a first initial intermediate calibration coefficient, a second initial intermediate calibration coefficient, a third initial intermediate calibration coefficient, and a fourth initial intermediate calibration coefficient. In some embodiments, the expression for determining the initial intermediate calibration coefficients is:

[0082] nfCoe_3=niCoe_3

[0083] nfCoe_2=niCoe_2

[0084] nfCoe_1=niCoe_1

[0085] nfCoe_0=Rec_Coe2

[0086] Wherein, nfCoe_3 represents the first initial intermediate calibration coefficient, nfCoe_2 represents the second initial intermediate calibration coefficient, nfCoe_1 represents the third initial intermediate calibration coefficient, nfCoe_0 represents the fourth initial intermediate calibration coefficient, niCoe_3 represents the first initial calibration coefficient, niCoe_2 represents the second initial calibration coefficient, niCoe_1 represents the third initial calibration coefficient, and Rec_Coe2 represents the initial correction error.

[0087] Based on the power values ​​acquired at the calibration points and the intermediate initial calibration coefficients, an initial intermediate calibration optical power value is determined. Specifically, the expression for determining the initial intermediate calibration optical power value is:

[0088] nfCald_Sample j =nfCoe_3·(Raw_Sample j ) 3 +nfCoe_2·(Raw_Sample j ) 2 +nfCoe_1·Raw_Sample j +nfCoe_0

[0089] Among them, nfCald_Sample jnfCoe_3 represents the first initial intermediate calibration optical power value, nfCoe_2 represents the second initial intermediate calibration coefficient, nfCoe_1 represents the third initial intermediate calibration coefficient, and nfCoe_0 represents the fourth initial intermediate calibration coefficient.

[0090] The initial calibration error is determined based on the initial intermediate calibration optical power value and the original power value at the calibration point. In some embodiments, the initial calibration error is the difference between the initial intermediate calibration optical power value and the original power value at the calibration point. Specifically, the formula for determining the initial calibration error is:

[0091] nFit_Error j =nfCald_Sample j -Raw_RSSI j

[0092] Among them, nFit_Error j This indicates the initial calibration error.

[0093] Step 160: Determine the calibration coefficient and calibration point based on the difference between the standard calibration error and the initial calibration error.

[0094] The calibration coefficients are used to calibrate the actual optical power ADC within the calibration range to the actual optical power based on the actual optical power ADC value at the calibration point. In some embodiments, the calibration coefficients and the calibration points are the calibration coefficients and initial calibration points corresponding to the selected calibration error; the selected calibration error is the initial calibration error whose difference from the standard calibration error is less than 0.1 dB. For example, by subtracting nFit_Error and Fit_Error to make the difference less than 0.1 dB, the resulting nfCoe_3, nfCoe_2, nfCoe_1, and nfCoe_0 are the required calibration coefficients, and the corresponding selected calibration points are also the calibration points that can be used in mass production to ensure high-precision calibration. After repeated calculations, a minimum of N calibration points are selected to ensure a calibration accuracy of ±0.5 dB within a dynamic calibration range of N dB.

[0095] Step 170: Based on the calibration point and the calibration coefficient, calibrate the acquired optical power to the actual optical power of the ADC.

[0096] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for calibrating an optical module, characterized in that, include: Obtain the original ADC and original optical power of the optical module to be calibrated within the calibration range; The original optical power ADC and the original optical power are preprocessed to obtain the acquired power value and the original power value, respectively. Based on the original power value and the acquired power value, the standard calibration error at each point within the calibration range is determined; Based on the aforementioned calibration range, multiple sets of initial calibration points are selected; For each set of initial calibration points, the initial calibration error for each initial calibration point is determined based on the power value collected at the calibration point and the original power value at the calibration point. The power value collected at the calibration point is the value at the initial calibration point in the collected power value, and the original power value at the calibration point is the value at the initial calibration point in the original power value; Based on the difference between the standard calibration error and the initial calibration error, the calibration coefficient and calibration point are determined; Based on the calibration point and the calibration coefficient, the acquired optical power is calibrated to the actual optical power by the actual ADC.

2. The method for calibrating an optical module according to claim 1, characterized in that, Determine the standard calibration error, including: Based on the acquired power value and the original power value, standard calibration coefficients are obtained; the standard calibration coefficients include a first standard calibration coefficient, a second standard calibration coefficient, a third standard calibration coefficient, and a fourth standard calibration coefficient. Based on the acquired power value and the standard calibration coefficient, the calibrated standard power value is obtained; The standard correction error is determined based on the minimum value among the original power values ​​and the minimum value among the calibrated standard power values. Based on the standard correction error and the standard calibration coefficient, standard intermediate calibration coefficients are determined; the standard intermediate calibration coefficients include a first standard intermediate calibration coefficient, a second standard intermediate calibration coefficient, a third standard intermediate calibration coefficient, and a fourth standard intermediate calibration coefficient. Based on the acquired power value and the standard intermediate calibration coefficient, the standard intermediate calibration optical power value is determined; The standard calibration error is determined based on the standard intermediate calibration optical power value and the original power value.

3. The method for calibrating an optical module according to claim 2, characterized in that, The standard correction error is the difference between the minimum value among the original power values ​​and the minimum value among the calibrated standard power values; the standard calibration error is the difference between the standard intermediate calibrated optical power value and the original power value.

4. The method for calibrating an optical module according to claim 3, characterized in that, Determine the initial calibration error, including: Based on the power values ​​collected at the calibration points and the original power values ​​at the calibration points, initial calibration coefficients are obtained; the initial calibration coefficients include a first initial calibration coefficient, a second initial calibration coefficient, a third initial calibration coefficient, and a fourth initial calibration coefficient. Based on the power value collected at the calibration point and the initial calibration coefficient, the calibrated initial power value is obtained; The initial correction error is determined based on the minimum value among the original power values ​​at the calibration point and the minimum value among the initial power values ​​after calibration. Based on the initial correction error and the initial calibration coefficient, initial intermediate calibration coefficients are determined; the initial intermediate calibration coefficients include a first initial intermediate calibration coefficient, a second initial intermediate calibration coefficient, a third initial intermediate calibration coefficient, and a fourth initial intermediate calibration coefficient. Based on the power values ​​collected at the calibration points and the initial intermediate calibration coefficient, the initial intermediate calibration optical power value is determined. The initial calibration error is determined based on the initial intermediate calibration optical power value and the original power value at the calibration point.

5. The method for calibrating an optical module according to claim 4, characterized in that, The initial correction error is the difference between the minimum value of the original power values ​​at the calibration point and the minimum value of the initial power values ​​after calibration. The initial calibration error is the difference between the initial intermediate calibration optical power value and the original power value at the calibration point.

6. The method for calibrating an optical module according to any one of claims 4-5, characterized in that, The standard calibration coefficients and the initial calibration coefficients are obtained by performing a three-stage coefficient calibration and solving the least squares method.

7. The method for calibrating an optical module according to any one of claims 2-5, characterized in that, The expressions for obtaining the calibrated standard power value and the calibrated initial power value are as follows: in, This indicates the calibrated standard power value. Indicates the first standard calibration factor. Indicates the second standard calibration factor. Indicates the third standard calibration factor. This represents the fourth standard calibration factor. Indicates the power value collected. This indicates the selected collection point, with a value ranging from 1 to M, where M represents the total number of collection points within the range. in, This indicates the initial power value after calibration. n represents the first initial calibration coefficient. n represents the second initial calibration coefficient. n represents the third initial calibration coefficient. This represents the fourth initial calibration coefficient. This indicates the power value collected at the calibration point. This indicates the selected initial calibration point, with a value ranging from 1 to N, where N represents the total number of initial calibration points.

8. The method for calibrating an optical module according to any one of claims 4-5, characterized in that, The expressions for the standard correction error and the initial correction error are obtained as follows: in, Indicates standard correction error. This represents the minimum value among the original power values. This represents the minimum value among the calibrated standard power values; in, This represents the initial correction error. This represents the minimum value among the original power values ​​at the calibration point. This represents the minimum value among the initial power values ​​after calibration.

9. The method for calibrating an optical module according to any one of claims 4-5, characterized in that, The expressions for the standard intermediate calibration coefficient and the initial intermediate calibration coefficient are determined as follows: in, This represents the intermediate calibration coefficient of the first standard. This represents the intermediate calibration coefficient of the second standard. This represents the intermediate calibration factor of the third standard. This represents the intermediate calibration factor of the fourth standard. Indicates the first standard calibration factor. Indicates the second standard calibration factor. Indicates the third standard calibration factor. Indicates standard correction error; in, This represents the first initial intermediate calibration coefficient. This represents the second initial intermediate calibration coefficient. This represents the third initial intermediate calibration coefficient. This represents the fourth initial intermediate calibration coefficient. n represents the first initial calibration coefficient. n represents the second initial calibration coefficient. This represents the third initial calibration coefficient. This represents the initial correction error.

10. The method for calibrating an optical module according to claim 1, characterized in that, The calibration coefficient and the calibration point are the calibration coefficient and the initial calibration point corresponding to the selected calibration error; the selected calibration error is the initial calibration error whose difference from the standard calibration error is less than 0.1dB.

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