Optical power correction method and system for optical power monitoring device

Abstract

The invention provides an optical power correction method and system for an optical power monitoring device, and the method comprises the steps: selecting a corresponding correction mode according to an input detection instruction; and when the correction mode is a calibration mode, calibrating the power of the emitted light beam, carrying out optical fiber attenuation calculation by using the worst loss power of optical fiber transmission according to a calibration value, and carrying out optical power correction according to a calculation result. According to the invention, through loss calculation of an optical link and comprehensive analysis and calculation of optical fiber attenuation, welding joint attenuation, insertion loss, refraction loss and wavelength, the detection target of the optical power meter with high precision, wide range and multiple working wavelengths is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power optical power monitoring, and in particular to an optical power correction method and system for an optical power monitoring device. Background Art

[0002] In today's era of rapid development of big data and artificial intelligence, there is a higher demand for real-time data transmission, especially for the reliability of optical fiber networks. The stability and reliability of optical networks for power equipment are of paramount importance for the safe operation of power equipment. The demand for latency is getting higher and higher, and the demand for network link load is getting higher and higher. Optical communication actually requires a demanding power budget. Since the actual channel characteristics are very complex, using general link equations to budget channel power often introduces large errors. Summary of the invention

[0003] The purpose of the present invention is to propose an optical power correction method and system for an optical power monitoring device, so as to solve the technical problem of how to achieve the detection target of an optical power meter with high precision, wide range and multiple working wavelengths.

[0004] On the one hand, a method for correcting optical power of an optical power monitoring device is provided, comprising:

[0005] Select the corresponding calibration mode according to the input detection instruction;

[0006] When the correction mode is the calibration mode, the emission light beam power is calibrated, the optical fiber attenuation is calculated based on the calibration value with the worst loss power of optical fiber transmission, and the optical power is corrected based on the calculation result.

[0007] Preferably, it also includes:

[0008] When the calibration mode is the test mode, the optical power data is obtained, and a piecewise linear calculation is performed based on the obtained optical power data to obtain a standard indication; the measured indication is corrected based on the standard indication, and the final test result is output.

[0009] Preferably, the calculation of optical fiber attenuation based on the worst optical fiber transmission loss power specifically includes:

[0010] Determine the type and specification of the optical fiber according to the length of the optical fiber link and the data rate to be transmitted, and determine the attenuation coefficient of the optical fiber according to the type and specification of the optical fiber;

[0011] The product of the actual length of the optical fiber and the attenuation coefficient of the optical fiber is output as the optical fiber path loss.

[0012] Preferably, the calculation of optical fiber attenuation based on the worst optical fiber transmission loss power also includes:

[0013] Determine the type of the fusion joint, and determine the corresponding attenuation value according to the type of the fusion joint, wherein the type of the fusion joint at least includes a discrete optical cable fiber joint, a ribbon optical cable fiber joint and an optical fiber cold splice.

[0014] Preferably, the calculation of optical fiber attenuation based on the worst optical fiber transmission loss power also includes:

[0015] Determine the corresponding line maintenance margin according to the optical fiber transmission distance; when the transmission distance is less than or equal to the first distance threshold, set the line maintenance margin to a first fixed value; when the transmission distance is greater than or equal to the first distance threshold and less than or equal to the second distance threshold, set the line maintenance margin to a second fixed value; when the transmission distance is greater than the second distance threshold, set the line maintenance margin to a third fixed value.

[0016] Preferably, the performing piecewise linearization calculation specifically includes:

[0017] Selecting a wavelength within a preset measurement range in the power optical fiber, and evenly dividing each wavelength into multiple segments according to the preset measurement range, wherein each segment corresponds to two wavelength calibration segments;

[0018] Compare the optical power data with the critical voltage value of each segment, determine the range of the segment, select the wavelength corresponding to the segment for calibration, and output it as a standard indication;

[0019] The critical voltage value of each segment is calculated based on the relationship between the output voltage of the logarithmic amplifier and the output current of the photodiode.

[0020] Preferably, the correction of the measured indication according to the standard indication specifically includes:

[0021] Calculate the optical power value according to the following formula:

[0022] P=d+f i +f i+1 +w i

[0023] Where P is the optical power value; f i and f i+1 is the wavelength shift; w i is the wavelength compensation amount, and each wavelength corresponds to a wavelength compensation amount.

[0024] Preferably, the correction of the measured indication according to the standard indication also includes:

[0025] The difference between the measured indication and the standard indication is output as the absolute error, and the negative value of the absolute error is output as the correction value to obtain the final test result.

[0026] On the other hand, an optical power correction system for an optical power monitoring device is also provided, for implementing the method described, comprising:

[0027] An interactive module, used to select a corresponding calibration mode according to an input detection instruction;

[0028] The correction module is used to calibrate the emission light beam power when the correction mode is the calibration mode, calculate the optical fiber attenuation based on the calibration value with the worst loss power of optical fiber transmission, and correct the optical power based on the calculation result.

[0029] Preferably, the correction module is also used to, when the calibration mode is the test mode, obtain optical power data, and perform piecewise linearization calculation based on the obtained optical power data to obtain a standard indication; perform measurement indication correction based on the standard indication, and output a final test result.

[0030] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0031] The optical power correction method and system for an optical power monitoring device provided by the present invention realizes the detection target of an optical power meter with high precision, wide range and multiple working wavelengths through comprehensive analysis and calculation of optical link loss calculation, optical fiber attenuation, fusion joint attenuation, insertion loss, refraction loss and wavelength. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0033] Figure 1 The main flow chart of a method for correcting optical power of an optical power monitoring device according to an embodiment of the present invention is shown in FIG.

[0034] Figure 2 The figure is a logic diagram of an optical power correction method for an optical power monitoring device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] like Figure 1 and Figure 2 FIG. 1 is a schematic diagram of an embodiment of an optical power correction method for an optical power monitoring device provided by the present invention. In this embodiment, the method includes the following steps:

[0037] Step S1, select the corresponding calibration mode according to the input detection instruction; it can be understood that the calibration unit or the single test unit is performed according to the selected detection mode; if it is a calibration test, the optical fiber attenuation calculation will be inserted.

[0038] Step S2, when the correction mode is the calibration mode, calibrate the emission beam power, calculate the fiber attenuation based on the calibration value and the worst loss power of the fiber transmission, and correct the optical power based on the calculation result. Understandably, the result after the fiber attenuation calculation is corrected according to the standard indication. Determine the type of the pre-optical signal amplifier based on the transmission characteristics of the photocurrent signal, including the calculation of the transmission characteristics of the operational amplifier and the high-precision logarithmic amplifier relationship;

[0039] Operational amplifiers are commonly used to amplify photocurrent signals and must operate in the linear region. Specifically, the output voltage U OUT With input voltage U in The relationship between them is called the voltage transfer characteristic and is:

[0040] U OUT =f*U in

[0041] Where: f is the gain coefficient.

[0042] Connecting a load resistor to the input of the op amp gives the following relationship between the output voltage and input current:

[0043] U OUT =f*i in

[0044] Where: f is the gain coefficient.

[0045] A high-precision logarithmic amplifier with input and output is used as the preamplifier. The relationship between the output voltage of the logarithmic amplifier and the output current of the photodiode is:

[0046]

[0047] θ y is the slope voltage; θ BEF is the reference voltage; i Z is the cut-off current of the photodiode; K is the gain coefficient; R Z is the resistance of the logarithmic amplifier peripheral circuit; R LOG is the internal structural resistance of the logarithmic amplifier chip.

[0048] It can be seen that there is no saturation region in the logarithmic amplifier. Within the same range, the logarithmic amplifier has a wider dynamic range, so a high-precision logarithmic amplifier is used.

[0049] In one embodiment, the optical fiber attenuation calculation based on the worst loss power of optical fiber transmission specifically includes: determining the optical fiber type and optical fiber specification according to the length of the optical fiber link and the data rate to be transmitted, and determining the attenuation coefficient of the optical fiber according to the optical fiber type and optical fiber specification; outputting the product between the actual length of the optical fiber and the attenuation coefficient of the optical fiber as the optical fiber path loss. Determine the type of fusion joint, and determine the corresponding attenuation value according to the type of fusion joint, wherein the type of fusion joint at least includes discrete optical cable optical fiber joint, ribbon optical cable optical fiber joint and optical fiber cold joint. Determine the corresponding line maintenance margin according to the optical fiber transmission distance; when the transmission distance is less than or equal to the first distance threshold, set the line maintenance margin to the first fixed value; when the transmission distance is greater than or equal to the first distance threshold and less than or equal to the second distance threshold, set the line maintenance margin to the second fixed value; when the transmission distance is greater than the second distance threshold, set the line maintenance margin to the third fixed value. It can be understood that the optical fiber attenuation calculation in this embodiment is used to detect and approve the transmission light beam power, and is calculated based on the worst loss power of optical fiber transmission. It includes optical fiber link attenuation, fusion joint attenuation, and line maintenance margin.

[0050] For the attenuation of the optical fiber link, it is necessary to determine the actual length of the optical fiber, usually in kilometers (km). Then, according to the length of the optical fiber link and the data rate to be transmitted, select the appropriate optical fiber type and specifications, find the attenuation coefficient of the optical fiber, in dB / km, and obtain the optical power characteristics of the light source used. Finally, calculate the total optical fiber path loss (Link Loss). The total loss of the optical fiber path is calculated using the following formula: Loss = L × attenuation coefficient. For the attenuation of the fusion joint, the attenuation of the discrete optical cable optical fiber joint is taken as the bidirectional average value: 0.08dB / each joint or the attenuation of the ribbon optical cable optical fiber joint is taken as the bidirectional average value: 0.2dB / each joint for calculation; if it is a fiber cold joint, the bidirectional average value is 0.15dB / joint. For the calculation of line maintenance margin, when designing a passive optical network, it is usually necessary to reserve a certain line maintenance margin (Mc). When the transmission distance is ≤5 km, the line maintenance margin is not less than 1dB, when the transmission distance is ≤10 km, the line maintenance margin is not less than 2dB, and when the transmission distance is >10 km, the line maintenance margin is not less than 3dB.

[0051] In one embodiment, when the calibration mode is the test mode, the optical power data is obtained, and a piecewise linearization calculation is performed based on the obtained optical power data to obtain a standard indication; the measured indication is corrected based on the standard indication, and the final test result is output. It is understandable that if a single optical fiber link test mode is used, the optical power data A / D conversion will be directly entered; the data will be converted into optical power data based on the obtained A / D data; a piecewise linearization calculation is performed based on the obtained data, and the wavelength is automatically selected; the measured indication is corrected based on the standard indication and the final test result is output.

[0052] In one embodiment, the segmented linearization calculation specifically includes: selecting a wavelength within a preset measurement range in the power optical fiber, and dividing each wavelength into multiple segments according to the preset measurement range, wherein each segment corresponds to two wavelength calibration segments; comparing the optical power data with the critical voltage value of each segment, determining the range of the segment, and selecting the wavelength corresponding to the segment for calibration, and outputting it as a standard indication; wherein the critical voltage value of each segment is calculated based on the relationship between the output voltage of the logarithmic amplifier and the output current of the photodiode. It can be understood that the segmented linearization is used to eliminate the influence of component characteristic drift caused by factors such as the external environment on the test results, improve the accuracy, and reduce the measurement error, including selecting the measurement range, segmentation, and data calculation; specifically, selecting the measurement range of -80 to +10dBm in the power optical fiber, and then dividing each wavelength into 6 segments according to the measurement range, wherein each segment corresponds to two wavelength calibration segments for the next step of data calculation, so as to improve the linearity of the logarithmic amplification curve, thereby improving the detection accuracy of the optical power meter. Data calculation is to compare the measured value transmitted by analog / digital (A / D) conversion with the critical A / D voltage value of each segment, determine the range of the segment, and then select the corresponding wavelength calibration. Among them, the critical value of each segment can be calculated experimentally according to the relationship between the output voltage of the logarithmic amplifier and the output current of the photodiode described in the photocurrent signal transmission characteristics. The output current value of the critical photodiode is:

[0053]

[0054] The output voltage of the logarithmic amplifier is 0~2.4V, and after amplification by the operational amplifier, it is 0~4.8V. The calculation formula for the piecewise linearization is: d=ax+b

[0055] Where: d is the result after the wavelength calibration section processing; x is the voltage value transmitted by A / D; a and b are the wavelength calibration sections.

[0056] Taking the result of the wavelength calibration section from 3.3 to 4.8V as 1 to 10, calculate the values ​​of a and b. The calculation formula for a is:

[0057]

[0058] In the formula: (d1, d1)(y2, x2) are the coordinates of the two ends of the segment respectively. Substituting (d2, x2) and a into d=ax+b, we can get b=3.1.

[0059] In one embodiment, the correction of the measured indication according to the standard indication specifically includes calculating the optical power value according to the following formula:

[0060] P=d+f i +f i+1 +wi

[0061] Where P is the optical power value; f i and f i+1 is the wavelength shift; w i The wavelength compensation value corresponds to a wavelength compensation value for each wavelength. The indication correction calculation is used to correct the measurement error between the standard optical power transmission value and the optical power meter to be calibrated, so as to send the wavelength compensation value instruction for self-correction without manual intervention and compensate the absolute error, including optical power meter value calculation, correction value calculation, and attenuation compensation.

[0062] In one embodiment, the correction of the measured indication according to the standard indication also includes outputting the difference between the measured indication and the standard indication as an absolute error, and outputting the negative value of the absolute error as a correction value to obtain the final test result. The absolute error is defined as the difference between the measured indication and the standard true value, and the negative value of the absolute error is called the correction value, represented by C. The expression for the indication correction is: C = -ΔA = A0-A Z .

[0063] An embodiment of the present invention further provides an optical power correction system for an optical power monitoring device, which is used to implement the optical power correction method for the optical power monitoring device, comprising:

[0064] An interactive module, used to select a corresponding calibration mode according to an input detection instruction;

[0065] The correction module is used to calibrate the emission light beam power when the correction mode is the calibration mode, calculate the optical fiber attenuation based on the calibration value with the worst loss power of optical fiber transmission, and correct the optical power based on the calculation result.

[0066] Specifically, the correction module is also used to, when the calibration mode is the test mode, obtain optical power data, and perform piecewise linearization calculation based on the obtained optical power data to obtain a standard indication; perform measurement indication correction based on the standard indication, and output a final test result.

[0067] It should be noted that the system described in the above embodiment corresponds to the method described in the above embodiment. Therefore, the undetailed parts of the system described in the above embodiment can be obtained by referring to the contents of the method described in the above embodiment, and will not be repeated here.

[0068] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0069] The optical power correction method and system for an optical power monitoring device provided by the present invention realizes the detection target of an optical power meter with high precision, wide range and multiple working wavelengths through comprehensive analysis and calculation of optical link loss calculation, optical fiber attenuation, fusion joint attenuation, insertion loss, refraction loss and wavelength.

[0070] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for correcting optical power of an optical power monitoring device, characterized in that: include: Select the corresponding calibration mode according to the input detection instruction; When the correction mode is the calibration mode, the emission light beam power is calibrated, the optical fiber attenuation is calculated based on the calibration value with the worst loss power of optical fiber transmission, and the optical power is corrected based on the calculation result.

2. The method according to claim 1, characterized in that Also includes, When the calibration mode is the test mode, the optical power data is obtained, and a piecewise linear calculation is performed based on the obtained optical power data to obtain a standard indication; the measured indication is corrected based on the standard indication, and the final test result is output.

3. The method according to claim 1, characterized in that The optical fiber attenuation calculation based on the worst optical fiber transmission loss power specifically includes: Determine the type and specification of the optical fiber according to the length of the optical fiber link and the data rate to be transmitted, and determine the attenuation coefficient of the optical fiber according to the type and specification of the optical fiber; The product of the actual length of the optical fiber and the attenuation coefficient of the optical fiber is output as the optical fiber path loss.

4. The method according to claim 3, characterized in that The calculation of optical fiber attenuation based on the worst optical fiber transmission loss power also includes: Determine the type of the fusion joint, and determine the corresponding attenuation value according to the type of the fusion joint, wherein the type of the fusion joint at least includes a discrete optical cable fiber joint, a ribbon optical cable fiber joint and an optical fiber cold splice.

5. The method according to claim 4, characterized in that The calculation of optical fiber attenuation based on the worst optical fiber transmission loss power also includes: Determine the corresponding line maintenance margin according to the optical fiber transmission distance; When the transmission distance is less than or equal to a first distance threshold, setting the line maintenance margin to a first fixed value; When the transmission distance is greater than or equal to the first distance threshold and less than or equal to the second distance threshold, the line maintenance margin is set to the second constant value; when the transmission distance is greater than the second distance threshold, the line maintenance margin is set to the third constant value.

6. The method according to claim 2, characterized in that The piecewise linearization calculation specifically includes: Selecting a wavelength within a preset measurement range in the power optical fiber, and evenly dividing each wavelength into multiple segments according to the preset measurement range, wherein each segment corresponds to two wavelength calibration segments; Compare the optical power data with the critical voltage value of each segment, determine the range of the segment, select the wavelength corresponding to the segment for calibration, and output it as a standard indication; The critical voltage value of each segment is calculated based on the relationship between the output voltage of the logarithmic amplifier and the output current of the photodiode.

7. The method according to claim 6, characterized in that The correction of the measured indication according to the standard indication specifically includes: Calculate the optical power value according to the following formula: P=d+f i +f i+1 +w i Where P is the optical power value; f i and f i+1 is the wavelength shift; w i is the wavelength compensation amount, and each wavelength corresponds to a wavelength compensation amount.

8. The method according to claim 7, characterized in that The correction of the measured indication according to the standard indication also includes: The difference between the measured indication and the standard indication is output as the absolute error, and the negative value of the absolute error is output as the correction value to obtain the final test result.

9. An optical power correction system for an optical power monitoring device, used to implement the method according to any one of claims 1 to 8, characterized in that: include: An interactive module, used to select a corresponding calibration mode according to an input detection instruction; The correction module is used to calibrate the emission light beam power when the correction mode is the calibration mode, calculate the optical fiber attenuation based on the calibration value with the worst loss power of optical fiber transmission, and correct the optical power based on the calculation result.

10. The system according to claim 9, characterized in that The correction module is also used to, when the calibration mode is the test mode, obtain optical power data, and perform piecewise linearization calculation based on the obtained optical power data to obtain a standard indication; perform measurement indication correction based on the standard indication, and output a final test result.

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