Line optical fiber quality determination method and system

Abstract

A line optical fiber quality determination method and system relates to the technical field of optical transmission, and comprises the following steps: determining whether there is a detection blind area according to a time delay value between a source end and a sink end and OTDR measurement data of the source end and the sink end; if the detection blind area does not exist, determining a line optical fiber quality curve according to the source end data curve and the sink end data curve; if the detection blind area exists, offset completion or attenuation processing is carried out on the source end data curve and the sink end data curve according to the range of the detection blind area, and then an optical fiber quality curve of a detection blind area line is determined; and obtaining a line optical fiber quality curve according to the detection blind area line optical fiber quality curve and the non-detection blind area line optical fiber quality curve. The problem that the optical fiber quality is difficult to accurately measure when the optical fiber distance between two stations exceeds the maximum measurement range in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the field of optical transmission technology, and in particular to a method and system for determining line optical fiber quality. Background Art

[0002] As the scale of optical transmission networks increases, network maintenance pays more attention to the quality of optical fibers. The optical time domain reflectometry technology is used in related technologies. It is a common method for measuring the quality of optical fibers in optical networks. It can measure the length of optical fibers and line loss. However, based on the existing OTDR (Optical Time Domain Reflectometer), the pulse energy sent by a single OTDR device is limited and the dynamic range is limited. When the distance between the optical fibers of two sites exceeds the maximum measurement range, it is difficult to accurately measure the quality of the optical fiber.

[0003] How to utilize existing network resources to improve the dynamic range of OTDR (the range of measurable fiber distance) without increasing the operator's network costs and realize long-distance and ultra-long-distance fiber quality detection has become an urgent problem to be solved. Summary of the invention

[0004] The embodiment of the present invention provides a line optical fiber quality determination method and system to solve the problem in the prior art that the optical fiber distance between two stations exceeds the maximum measurement range and it is difficult to accurately measure the optical fiber quality.

[0005] In a first aspect, an embodiment of the present application provides a method for determining line optical fiber quality, which comprises the steps of:

[0006] Determine whether there is a detection blind area based on the delay value between the source and sink, and the OTDR measurement data of the source and sink;

[0007] If there is no detection blind area, the line optical fiber quality curve is determined based on the source end data curve and the sink end data curve;

[0008] If there is a detection blind area, offset complement or attenuation processing is performed on the source end data curve and the sink end data curve according to the range of the detection blind area, so as to determine the optical fiber quality curve of the detection blind area line;

[0009] The line optical fiber quality curve is obtained according to the line optical fiber quality curve of the detection blind area and the line optical fiber quality curve of the non-detection blind area.

[0010] In combination with the first aspect, in one implementation, judging whether there is a detection blind area according to the delay value between the source and the sink, and the OTDR measurement data of the source and the sink, comprises the steps of:

[0011] Calculate the reference length of the optical fiber based on the delay value between the source end and the sink end;

[0012] Determine the measurable optical fiber length at the source end and the measurable optical fiber length at the sink end according to the maximum dynamic range of the OTDR at the source end and the sink end;

[0013] Whether there is a detection blind area is determined according to whether the sum of the measurable optical fiber length at the source end and the measurable optical fiber length at the sink end is greater than the optical fiber reference length.

[0014] In combination with the first aspect, in one implementation, if there is no detection blind area, determining the line optical fiber quality curve according to the source end data curve and the sink end data curve includes:

[0015] Determine the intersection of the source data curve and the sink data curve;

[0016] A line optical fiber quality curve is obtained according to a source end data curve or a sink end data curve on one side of the intersection and a mirror image curve of the source end data curve or the sink end data curve on the other side of the intersection.

[0017] In combination with the first aspect, in one implementation, if there is a detection blind spot, offset complement or attenuation processing is performed on the source data curve and the sink data curve according to the range of the detection blind spot, so as to determine the optical fiber quality curve of the detection blind spot line, including:

[0018] Determine whether the length of the detection blind area is greater than the set value;

[0019] If it is not greater than the set value, a section of the curve from the end event position of the source and sink data curves to the starting point is used to splice the source and sink data curves respectively to obtain a first source data curve and a first sink data curve;

[0020] Determine an intersection point of the first source data curve and the first sink data curve;

[0021] A line optical fiber quality curve is obtained according to the first source data curve or the first sink data curve on one side of the intersection and the mirror curve of the first source data curve or the first sink data curve on the other side of the intersection.

[0022] In combination with the first aspect, in one implementation, determining whether the length of the detection blind area is greater than a set value includes:

[0023] Obtaining the end event abscissas E1 and E2 of the source and sink data curves measured using the maximum dynamic range;

[0024] Acquire end event abscissas E1′ and E2′ of source and sink data curves measured using a first dynamic range smaller than the maximum dynamic range;

[0025] Determine whether the length of the detection blind area is less than the value of E1-E1′+E2-E2′;

[0026] If it is greater than, it is determined that the length of the detection blind area is greater than the set value;

[0027] If it is less than or equal to, it is determined that the detection blind area length is not greater than the set value.

[0028] In combination with the first aspect, in one implementation, a section of a curve from the curve end event position to the starting point of the source and sink data curves is used to splice with the source and sink data curves respectively to obtain a first source data curve and a first sink data curve, including:

[0029] splicing the source data curve E1 to E1′ segment to the end event position of the source data curve to obtain a first source data curve;

[0030] The segment E2 to E2′ of the sink data curve is spliced ​​to the end event position of the sink data curve to obtain a first sink data curve.

[0031] In combination with the first aspect, in one implementation, if there is a detection blind spot, offset complement or attenuation processing is performed on the source data curve and the sink data curve according to the range of the detection blind spot, so as to determine the optical fiber quality curve of the detection blind spot line, including:

[0032] Determine whether the length of the detection blind area is greater than the set value;

[0033] If it is greater than the set value, the source and sink data curves under multiple dynamic ranges are obtained;

[0034] Determine a standard attenuation coefficient of the source end and a standard attenuation coefficient of the sink end according to the source and sink data curves under the multiple dynamic ranges;

[0035] According to the source end data curve and the standard attenuation coefficient of the source end, the sink end data curve and the standard attenuation coefficient of the sink end, a second source end data curve and a second sink end data curve are obtained;

[0036] A line optical fiber quality curve is obtained according to the second source end data curve and the second sink end data curve.

[0037] In combination with the first aspect, in one implementation, determining the attenuation coefficient of the source and the standard attenuation coefficient of the sink according to the source and sink data curves under the multiple dynamic ranges includes:

[0038] Obtaining attenuation coefficients of source and sink data curves under multiple dynamic ranges, and calculating average attenuation coefficients of the source and sink;

[0039] Calculate the overall standard deviation of the attenuation coefficients of the source and sink data curves according to the attenuation coefficients of the source and sink data curves under the multiple dynamic ranges and the average attenuation coefficients of the source and sink;

[0040] Determine whether the overall standard deviation of the attenuation coefficient of the source and sink data curves is less than a selected value, and if so, use the average attenuation coefficient of the source or sink as the standard attenuation coefficient of the source or sink;

[0041] If it is not less than, the attenuation coefficient corresponding to the maximum dynamic range of the source and sink ends is used as the standard attenuation coefficient of the source or sink end.

[0042] In combination with the first aspect, in one implementation, obtaining a second source data curve and a second sink data curve according to the source data curve and the standard attenuation coefficient of the source, the sink data curve and the standard attenuation coefficient of the sink includes:

[0043] Determine the intersection of the second source end data curve and the second sink end data curve according to the reference length of the optical fiber, the standard attenuation coefficient of the source end, and the standard attenuation coefficient of the sink end;

[0044] According to the abscissa of the terminal event position of the source and sink data curves and the OTDR resolution, the abscissa of each point in the blind area of ​​the source and sink data curves is obtained;

[0045] The ordinates of each point in the blind area of ​​the source and sink data curves are obtained according to the ordinates of the end event positions of the source and sink data curves and the standard attenuation coefficients of the source and sink.

[0046] In a second aspect, an embodiment of the present application provides a line optical fiber quality determination system, which includes:

[0047] A source-end device, comprising a source-end OTDR, a source-end coupler connected to the source-end OTDR, and the source-end coupler connected to one end of the line optical fiber;

[0048] A sink device, comprising a sink OTDR, a sink coupler connected to the sink OTDR, and the sink coupler is connected to the other end of the line optical fiber;

[0049] A calculation device is used to determine whether there is a detection blind area according to the delay value between the source end and the destination end, and the OTDR measurement data of the source end and the destination end; if there is no detection blind area, determine the line fiber quality curve according to the source end data curve and the destination end data curve; if there is a detection blind area, offset completion or attenuation processing is performed on the source end data curve and the destination end data curve according to the range of the detection blind area, so as to determine the fiber quality curve of the detection blind area line; obtain the line fiber quality curve according to the fiber quality curve of the detection blind area line and the fiber quality curve of the non-detection blind area line.

[0050] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0051] The embodiment of the present invention provides a method and system for determining line optical fiber quality, which utilizes system delay and line reference attenuation, integrates double-end detection data according to actual OTDR measurement data, and improves the OTDR detection dynamic range without increasing system cost. The existing network resources are used to measure the quality of long-distance optical fibers. The requirements for optical fiber quality detection at different distances can be met without increasing the network cost of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 A schematic diagram of an optical transmission network provided by an embodiment of the present invention;

[0053] Figure 2 A flow chart of a method for determining line optical fiber quality provided by an embodiment of the present invention;

[0054] Figure 3 It is a data curve diagram measured by the OTDR using the maximum dynamic range in the embodiment of the present invention;

[0055] Figure 4 It is a schematic diagram of the combined line segments of the source end curve and the sink end curve without a detection blind area in an embodiment of the present invention;

[0056] Figure 5 It is a schematic diagram of a combined curve of a source end curve and a sink end curve without a detection blind area in an embodiment of the present invention;

[0057] Figure 6 It is a schematic diagram of a combined curve of a source-end curve and a sink-end curve with a detection blind area in an embodiment of the present invention. DETAILED DESCRIPTION

[0058] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0059] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0060] Please refer to Figure 1 , Figure 1 This is a scenario in which a line optical fiber quality determination method according to an embodiment of the present invention can be applied; specifically, Figure 1A schematic diagram of an optical transmission network provided in an embodiment of the present invention includes a source end and a sink end. Both the source end and the sink end are provided with an OTDR (Optical Time Domain Reflectometer) and an optical supervisory channel (Optical Supervisory Channel, OSC). Both the OTDR and the OSC are coupled by a coupler and transmitted to the other end. The master control controls the OTDR and the OSC to perform related tasks.

[0061] In a first aspect, an embodiment of the present invention provides a method for determining line optical fiber quality. Figure 2 , Figure 2 This is a flow chart of a method for determining line optical fiber quality in the present application, the method comprising the steps of:

[0062] S10. Determine whether there is a detection blind area based on the delay value between the source end and the sink end and the OTDR measurement data of the source end and the sink end.

[0063] It should be understood that when the source and sink clocks are synchronized, the delay value between the source and sink is generated because it takes a certain amount of time for the optical signal to be transmitted from the source to the sink. Based on this time, the transmission path length between the source and the sink, that is, the reference length of the optical fiber, can be calculated. The OTDR measurement data at the source and sink can be used to obtain the effective distance that the OTDR at these two ends can measure respectively. Subtracting the two can calculate whether there is a blind spot.

[0064] Specifically, the 1588 time synchronization technology can be used to synchronize the time between the source and the sink, and then the delay value Ta is measured at the source (station A), and the delay value Tb is measured at the sink (station B). The delay value between station A and station B is Calculate the reference fiber length between AB Where C is the speed of light in a vacuum and r is the refractive index of the optical fiber.

[0065] Please refer to Figure 3 , Figure 3 It is a data curve diagram measured by OTDR using the maximum dynamic range in the embodiment of the present invention. It should be noted that the curves collected at the source end and the sink end are different, but they all follow Figure 3 The basic situation is that after a certain distance, the measured curve becomes very irregular due to the fact that it exceeds the measurement range of the OTDR. The end of the regular curve is the end event of the OTDR, and the curves obtained before the end event are all credible. Figure 3 In the OTDR measurement curve, the horizontal axis is distance, the vertical axis is power, the curve point data is [L1, P1], [L2, P2]... [Lm, Pm], [Ln, Pn], and the end event point E data is [Lm, Pm]. Figure 3Taking the source end curve as an example, the end event point E data [Lm, Pm] is the horizontal and vertical coordinates of the end event point of the source end.

[0066] Therefore, in some embodiments, the step S10 determines whether there is a detection blind area according to the delay value between the source and the sink, and the OTDR measurement data of the source and the sink, and may further include the following specific steps:

[0067] Step S11: Calculate the reference length of the optical fiber according to the delay value between the source end and the sink end.

[0068] Step S12: Determine the measurable optical fiber length at the source end and the measurable optical fiber length at the sink end according to the maximum dynamic range of the OTDR at the source end and the sink end.

[0069] Step S13: Determine whether there is a detection blind area according to whether the sum of the measurable optical fiber length at the source end and the measurable optical fiber length at the sink end is greater than the optical fiber reference length.

[0070] Specifically, OTDR is used at the source end and the sink end to perform measurements under the maximum dynamic range to obtain the measurable optical fiber length La at the source end and the measurable optical fiber length Lb at the sink end. If La+Lb≥L0, there is no detection blind area.

[0071] After executing step S10, execute step S20, which includes:

[0072] If there is no detection blind area, the line optical fiber quality curve is determined based on the source end data curve and the sink end data curve.

[0073] Since there is no detection blind spot, the source data curve and the sink data curve cover the entire optical fiber line. It is only necessary to find the intersection of the source data curve and the sink data curve to obtain the line optical fiber quality curve of the entire optical fiber line.

[0074] Specifically, step S20 may include the following further steps:

[0075] S21: Determine the intersection point of the source data curve and the sink data curve.

[0076] S22: Obtain a line optical fiber quality curve according to the source data curve or the sink data curve on one side of the intersection and a mirror image curve of the source data curve or the sink data curve on the other side of the intersection.

[0077] The method for determining the intersection of the source data curve and the sink data curve may be as follows:

[0078] Please refer to Figure 4 and Figure 5 , Figure 4Schematic diagram of the combined line segment of the source end curve and the sink end curve without a detection blind area in an embodiment of the present invention, Figure 5 The source end OTDR measurement data is the AC segment, the sink end OTDR measurement data is the BD segment, and the fitting point is calculated. Select the curve data [Ld, Pd]...[Lm, Pm] with the horizontal coordinate from Ld to the end event point in the source data curve, and record it as Data1. Select the data [Lc, Pc]...[Leb, Peb] with the horizontal coordinate from Lc to Leb in the sink data curve, and record it as Data2. Figure 4 , it can be seen that Ld is the horizontal coordinate position of the end point of the destination curve corresponding to the source curve. Lc is the horizontal coordinate position of the end point of the source curve corresponding to the destination curve. Lm is the horizontal coordinate of the source end event, and Leb is the horizontal coordinate of the destination end event. Since there is an intersection between the source and destination curves, in order to reduce the workload of calculating the intersection, it is not necessary to take the entire curve of the source and destination for calculation. Only the point from the end event of the destination on the source curve to the end event point of the source is required for calculation, and the same applies to the destination.

[0079] When calculating the intersection point, in Data1 and Data2, take the point with the horizontal coordinate Lδ as the starting point, find the point with equal horizontal and vertical coordinates, which is the merge point and record it as [Lj, Pj]. It should be understood that the fitting point is the intersection of the source curve and the destination data curve. The horizontal coordinate of the fitting point is calculated here, and the calculated result value represents the position of the horizontal coordinate from the end event of the source curve and the end event of the destination curve. Figure 4 As shown, C is the end event of the source curve, and the fitting point is the point on the source curve whose horizontal coordinate is Lδ away from C. If it is equal to 0, it is the C end event. The same is true for the destination curve.

[0080] After finding the intersection, the curve on one side of the intersection is flipped, that is, mirrored along an axis passing through the intersection and parallel to the horizontal axis, to obtain the line fiber quality curve.

[0081] After executing step S20, execute step S30, which includes:

[0082] If there is a detection blind area, offset completion or attenuation processing is performed on the source data curve and the sink data curve according to the range of the detection blind area, so as to determine the optical fiber quality curve of the detection blind area line.

[0083] In some scenarios, although there is a blind spot, it is not large and the curve change of the blind spot is not obvious. In this case, a curve close to the blind spot can be used to fill in the blind spot. For example, the offset filling method can be used to fill in the entire data curve, and then the fiber quality curve can be obtained. If the blind spot is too large, the change of the data curve may be relatively large. The offset filling method may cause a large error, and even cause the final result to deviate seriously from the actual value. At this time, the attenuation of the curve needs to be considered. After calculating the attenuation, the curve of the blind spot is calculated according to the attenuation, and then the fiber quality curve is obtained.

[0084] After executing step S20, execute step S30, which includes:

[0085] If there is a detection blind area, offset completion or attenuation processing is performed on the source data curve and the sink data curve according to the range of the detection blind area, so as to determine the optical fiber quality curve of the detection blind area line.

[0086] In some scenarios, although there is a blind spot, it is not large and the curve change of the blind spot is not obvious. In this case, a curve close to the blind spot can be used to fill in the blind spot. For example, the offset filling method can be used to fill in the entire data curve, and then the fiber quality curve can be obtained. If the blind spot is too large, the change of the data curve may be relatively large. The offset filling method may cause a large error, and even cause the final result to deviate seriously from the actual value. At this time, the attenuation of the curve needs to be considered. After calculating the attenuation, the curve of the blind spot is calculated according to the attenuation, and then the fiber quality curve is obtained.

[0087] Specifically, in some embodiments, step S30 may further include the following steps:

[0088] S31: Determine whether the length of the detection blind area is greater than a set value.

[0089] In the above implementation, it is first necessary to determine whether the length of the blind area is greater than a set value. It should be understood that the set value can be adjusted according to requirements, such as differences in OTDRs, accuracy requirements for usage scenarios, etc.

[0090] The specific methods for determining whether the length of the detection blind area is greater than the set value include:

[0091] S311: Obtain the end event abscissas E1 and E2 of the source and sink data curves measured using the maximum dynamic range.

[0092] It should be understood that, according to the above description, the end event coordinates of the OTDR can be obtained based on the measured data curve. Its horizontal coordinates E1 and E2 also represent the maximum value of the optical fiber length that can be measured by the source and sink OTDRs.

[0093] S312: Acquire the end event abscissas E1′ and E2′ of the source and sink data curves measured using a first dynamic range smaller than the maximum dynamic range.

[0094] It should be noted that in order to ensure accuracy, a first dynamic range slightly smaller than the maximum dynamic range can be selected. In this embodiment, a range 5db smaller than the maximum dynamic range is selected for measurement to obtain new terminal event horizontal coordinates E1′, E2′.

[0095] S313: Determine whether the length of the detection blind area is less than the value of E1-E1′+E2-E2′; if greater, proceed to S314; if less than or equal to, proceed to S315.

[0096] S314: Determine whether the length of the detection blind area is greater than a set value.

[0097] S315: Determine whether the length of the detection blind area is not greater than a set value.

[0098] Through steps S311 to S315, it is possible to quickly confirm whether the size of the blind area is greater than the set value. If the set value needs to be adjusted, we only need to adjust the size of the first dynamic range.

[0099] After step S31 is executed, different strategies are executed according to the size of the blind area.

[0100] S32: If it is not greater than the set value, a section of the curve from the curve end event position to the starting point of the source and sink data curves is used to splice with the source and sink data curves respectively to obtain a first source data curve and a first sink data curve.

[0101] Specifically, step S32 may also include step S321 and step S322.

[0102] S321: including splicing the source data curve E1 to E1′ segment to the end event position of the source data curve to obtain a first source data curve;

[0103] S322: including splicing the segment E2 to E2′ of the sink data curve to the end event position of the sink data curve to obtain a first sink data curve.

[0104] After obtaining the first source data curve and the first destination data curve, it is also possible to calculate whether the sum of the optical fiber line lengths covered by the first source data curve and the first destination data curve is greater than L0. If so, it means that the first source data curve and the first destination data curve have no blind spots after splicing. If so, it means that re-splicing is required.

[0105] After completing step S32, a first source-end data curve and a first sink-end data curve without blind areas are obtained.

[0106] Step S33 is started: Determine the intersection point of the first source - end data curve and the first sink - end data curve.

[0107] S34: Obtain the line optical - fiber quality curve based on the first source - end data curve or the first sink - end data curve on one side of the intersection point, and the mirror curve of the first source - end data curve or the first sink - end data curve on the other side of the intersection point.

[0108] In step S30, if the detection blind area is large, in some embodiments, the following method can also be adopted when executing S32:

[0109] S31: Determine whether the length of the detection blind area is greater than a set value; the specific method of step S31 has been introduced in the foregoing part and will not be repeated here.

[0110] S35: If it is greater than the set value, obtain the source - end and sink - end data curves at multiple dynamic ranges.

[0111] Specifically, taking the source - end as an example first, the sink - end can execute the same method. In some embodiments, select multiple dynamic ranges D1, D2... Dn (where D1 < D2... < Dn), and perform measurements to obtain multiple data curves G1, G2... Gn.

[0112] S36: Determine the standard attenuation coefficient of the source - end and the standard attenuation coefficient of the sink - end according to the source - end and sink - end data curves at the above - mentioned multiple dynamic ranges.

[0113] Among them, step S36 may further include the following steps:

[0114] S361: Obtain the attenuation coefficients of the source - end and sink - end data curves at multiple dynamic ranges, and calculate the average attenuation coefficients of the source - end and the sink - end.

[0115] S362: Calculate the overall standard deviation of the attenuation coefficients of the source - end and sink - end data curves according to the attenuation coefficients of the source - end and sink - end data curves at the above - mentioned multiple dynamic ranges and the average attenuation coefficients of the source - end and the sink - end.

[0116] S363: Determine whether the overall standard deviation of the attenuation coefficients of the source - end and sink - end data curves is less than a selected value. If it is less, enter S364; if it is not less, enter S365.

[0117] S364: Take the average attenuation coefficient of the source - end or the sink - end as the standard attenuation coefficient of the source - end or the sink - end;

[0118] S365: Take the attenuation coefficient corresponding to the maximum dynamic range at the source - end and the sink - end as the standard attenuation coefficient of the source - end or the sink - end.

[0119] Specifically, taking the source end as an example, the sink end can perform the same method to calculate the attenuation coefficients α1, α2...αn corresponding to each data curve of the source end. The attenuation coefficient α is:

[0120]

[0121] Among them, [L1, P1] and [L2, P2] are two points on the curve, L2 is greater than L1, calculate the average attenuation coefficient, and then calculate the overall standard deviation δ1 of the attenuation coefficient of the source curve. If δ1 is less than or equal to α0 / 10, it means that the attenuation is uniform, then the source attenuation coefficient θ1=α0, where α0 is the standard attenuation coefficient of the source; if the overall standard deviation δ is greater than α0 / 10, it means that the attenuation is uneven, then the source attenuation coefficient θ1=αn. Then the sink attenuation coefficient θ2 is obtained in the same way. The standard attenuation coefficient of the source and the overall standard deviation of the attenuation coefficient of the source curve are calculated as follows:

[0122] After executing step S36, execute step S37, which includes:

[0123] S37: Obtain a second source data curve and a second sink data curve according to the source data curve and the standard attenuation coefficient of the source, the sink data curve and the standard attenuation coefficient of the sink.

[0124] It should be understood that, since the data in the source data curve and the sink data curve within the measurable optical fiber length range are accurate and valid, what we need is still the curve data of the blind area. Therefore, in some embodiments, step S37 may also include the following specific steps:

[0125] S371: Determine an intersection point of the second source-end data curve and the second sink-end data curve according to a reference length of the optical fiber, a standard attenuation coefficient of the source end, and a standard attenuation coefficient of the sink end.

[0126] S372: Obtain the abscissa of each point in the blind area of ​​the source and sink data curves according to the abscissa of the terminal event position of the source and sink data curves and the OTDR resolution.

[0127] S373: Obtain the ordinates of each point in the blind area of ​​the source and sink data curves according to the ordinates of the end event positions of the source and sink data curves and the standard attenuation coefficients of the source and sink.

[0128] Specifically, in a specific embodiment, still taking the source end as an example, the sink end can perform the same method to calculate the abscissa of the intersection of the second source end data curve and the second sink end data curve according to the source sink attenuation coefficient.

[0129] The number of data points between the end events Lm and Lj of the source end curve is N1 = (Lj-Lm) / γ, where γ is the measurement resolution of the source end OTDR. The first point of the detection blind area is recorded as [L1′, P1′], [L2′, P2′]...[Ln′, Pn′], then L1′ = Lm+γ, L2′ = Lm+2γ...Ln′ = Lm+nγ; in formula (1), take L1 and P1 data as the end event point [Lm, Pm], and L2 takes the horizontal coordinates of the blind area data points L1′, L2′...Ln′ and substitutes them into formula (1) to calculate The ordinate Pj′ (j′=1, 2...N1) of the blind area data point is calculated; similarly, using θ2, the ordinate of the blind area data point to the right of the intersection point Lj is calculated.

[0130] Based on the detectable range of existing devices, by setting the attenuation coefficient distribution under multiple dynamic ranges D1, D2...Dn, the attenuation blind area can be calculated more objectively and accurately. At the same time, since the larger the dynamic range, the closer the data curve is to the true value, when the attenuation is relatively stable, the average attenuation coefficient is directly used as the source end attenuation coefficient. If the attenuation is not very stable, the attenuation coefficient corresponding to the larger value in the selected dynamic range is used as the source end attenuation coefficient.

[0131] Please refer to Figure 6 , Figure 6 It is a schematic diagram of a combined curve of a source end curve and a sink end curve in an embodiment of the present invention where there is a detection blind area.

[0132] In step S38: a line fiber quality curve is obtained according to the second source end data curve and the second sink end data curve. Figure 6 It can be seen that, whether through offset supplementation or attenuation coefficient calculation, as long as the coordinates of each point on the blind spot curve are obtained, the complete line fiber quality curve can be obtained by confirming the intersection and then flipping it.

[0133] In a second aspect, an embodiment of the present application provides a line optical fiber quality determination system, comprising:

[0134] The source end device comprises a source end OTDR and a source end coupler connected to the source end OTDR, wherein the source end coupler is connected to one end of the line optical fiber.

[0135] The sink device includes a sink OTDR and a sink coupler connected to the sink OTDR, wherein the sink coupler is connected to the other end of the line optical fiber.

[0136] A calculation device is used to determine whether there is a detection blind area according to the delay value between the source end and the destination end, and the OTDR measurement data of the source end and the destination end; if there is no detection blind area, determine the line fiber quality curve according to the source end data curve and the destination end data curve; if there is a detection blind area, offset completion or attenuation processing is performed on the source end data curve and the destination end data curve according to the range of the detection blind area, so as to determine the fiber quality curve of the detection blind area line; obtain the line fiber quality curve according to the fiber quality curve of the detection blind area line and the fiber quality curve of the non-detection blind area line.

[0137] Among them, the functional implementation of each module in the above system corresponds to each step in the above method embodiment, and its functions and implementation processes will not be repeated here one by one.

[0138] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0139] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0140] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0141] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0142] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0143] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for determining line optical fiber quality, characterized in that: It includes the steps of: Determine whether there is a detection blind area based on the delay value between the source and sink, and the OTDR measurement data of the source and sink; If there is no detection blind area, the line optical fiber quality curve is determined based on the source end data curve and the sink end data curve; If there is a detection blind area, offset complement or attenuation processing is performed on the source end data curve and the sink end data curve according to the range of the detection blind area, so as to determine the optical fiber quality curve of the detection blind area line; The line optical fiber quality curve is obtained according to the line optical fiber quality curve of the detection blind area and the line optical fiber quality curve of the non-detection blind area.

2. The method for determining line optical fiber quality according to claim 1, characterized in that: The method of judging whether there is a detection blind area according to the delay value between the source end and the sink end and the OTDR measurement data of the source end and the sink end comprises the steps of: Calculate the reference length of the optical fiber based on the delay value between the source end and the sink end; Determine the measurable optical fiber length at the source end and the measurable optical fiber length at the sink end according to the maximum dynamic range of the OTDR at the source end and the sink end; Whether there is a detection blind area is determined according to whether the sum of the measurable optical fiber length at the source end and the measurable optical fiber length at the sink end is greater than the optical fiber reference length.

3. The method for determining line optical fiber quality according to claim 1, characterized in that: If there is no detection blind area, determining the line optical fiber quality curve according to the source end data curve and the sink end data curve includes: Determine the intersection of the source data curve and the sink data curve; A line optical fiber quality curve is obtained according to a source end data curve or a sink end data curve on one side of the intersection and a mirror image curve of the source end data curve or the sink end data curve on the other side of the intersection.

4. The method for determining line optical fiber quality according to claim 1, characterized in that: If there is a detection blind area, offset complement or attenuation processing is performed on the source data curve and the sink data curve according to the range of the detection blind area, so as to determine the optical fiber quality curve of the detection blind area line, including: Determine whether the length of the detection blind area is greater than the set value; If it is not greater than the set value, a section of the curve from the end event position of the source and sink data curves to the starting point is used to splice the source and sink data curves respectively to obtain a first source data curve and a first sink data curve; Determining an intersection point of the first source data curve and the first sink data curve; A line optical fiber quality curve is obtained according to the first source data curve or the first sink data curve on one side of the intersection and the mirror curve of the first source data curve or the first sink data curve on the other side of the intersection.

5. The method for determining line optical fiber quality according to claim 4, characterized in that: The determining whether the length of the detection blind area is greater than a set value includes: Obtaining the end event abscissas E1 and E2 of the source and sink data curves measured using the maximum dynamic range; Acquire the end event abscissas E1′ and E2′ of the source and sink data curves measured using a first dynamic range smaller than the maximum dynamic range; Determine whether the length of the detection blind area is less than the value of E1-E1′+E2-E2′; If it is greater than, it is determined that the length of the detection blind area is greater than the set value; If it is less than or equal to, it is determined that the detection blind area length is not greater than the set value.

6. The method for determining line optical fiber quality according to claim 5, characterized in that: Using a section of the curve from the end event position of the source and sink data curves to the starting point direction to splice with the source and sink data curves respectively, to obtain a first source data curve and a first sink data curve, including: splicing the source data curve E1 to E1′ segment to the end event position of the source data curve to obtain a first source data curve; The segment E2 to E2′ of the sink data curve is spliced ​​to the end event position of the sink data curve to obtain a first sink data curve.

7. The line optical fiber quality determination method according to claim 1, characterized in that: If there is a detection blind area, offset complement or attenuation processing is performed on the source data curve and the sink data curve according to the range of the detection blind area, so as to determine the optical fiber quality curve of the detection blind area line, including: Determine whether the length of the detection blind area is greater than the set value; If it is greater than the set value, the source and sink data curves under multiple dynamic ranges are obtained; Determine a standard attenuation coefficient of the source end and a standard attenuation coefficient of the sink end according to the source and sink data curves under the multiple dynamic ranges; According to the source end data curve and the standard attenuation coefficient of the source end, the sink end data curve and the standard attenuation coefficient of the sink end, a second source end data curve and a second sink end data curve are obtained; A line optical fiber quality curve is obtained according to the second source end data curve and the second sink end data curve.

8. The method for determining line optical fiber quality according to claim 7, characterized in that: The step of determining the attenuation coefficient of the source end and the standard attenuation coefficient of the sink end according to the source and sink end data curves under the multiple dynamic ranges includes: Obtaining attenuation coefficients of source and sink data curves under multiple dynamic ranges, and calculating average attenuation coefficients of the source and sink; Calculate the overall standard deviation of the attenuation coefficients of the source and sink data curves according to the attenuation coefficients of the source and sink data curves under the multiple dynamic ranges and the average attenuation coefficients of the source and sink; Determine whether the overall standard deviation of the attenuation coefficient of the source and sink data curves is less than a selected value, and if so, use the average attenuation coefficient of the source or sink as the standard attenuation coefficient of the source or sink; If it is not less than, the attenuation coefficient corresponding to the maximum dynamic range of the source and sink ends is used as the standard attenuation coefficient of the source or sink end.

9. The line optical fiber quality determination method according to claim 7, characterized in that: The step of obtaining a second source data curve and a second sink data curve according to the source data curve and the standard attenuation coefficient of the source, the sink data curve and the standard attenuation coefficient of the sink includes: Determine the intersection of the second source end data curve and the second sink end data curve according to the reference length of the optical fiber, the standard attenuation coefficient of the source end, and the standard attenuation coefficient of the sink end; According to the abscissa of the terminal event position of the source and sink data curves and the OTDR resolution, the abscissa of each point in the blind area of ​​the source and sink data curves is obtained; The ordinates of each point in the blind area of ​​the source and sink data curves are obtained according to the ordinates of the end event positions of the source and sink data curves and the standard attenuation coefficients of the source and sink.

10. A line optical fiber quality determination system, characterized in that: It includes: A source-end device, comprising a source-end OTDR, a source-end coupler connected to the source-end OTDR, and the source-end coupler connected to one end of the line optical fiber; A sink device, comprising a sink OTDR, a sink coupler connected to the sink OTDR, and the sink coupler is connected to the other end of the line optical fiber; A calculation device, which is used to determine whether there is a detection blind area according to the delay value between the source end and the sink end, and the OTDR measurement data of the source end and the sink end; if there is no detection blind area, determine the line optical fiber quality curve according to the source end data curve and the sink end data curve; If there is a detection blind area, offset complement or attenuation processing is performed on the source end data curve and the sink end data curve according to the range of the detection blind area, so as to determine the optical fiber quality curve of the detection blind area line; The line optical fiber quality curve is obtained according to the line optical fiber quality curve of the detection blind area and the line optical fiber quality curve of the non-detection blind area.

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