A method and system for determining line optical fiber quality

Abstract

A method and system for determining line fiber quality, relating to the field of optical transmission technology, includes the following steps: determining whether a detection blind spot exists based on the time delay between the source and sink ends, as well as OTDR measurement data from the source and sink ends; if no detection blind spot exists, determining the line fiber quality curve based on the source and sink data curves; if a detection blind spot exists, performing offset complementation or attenuation processing on the source and sink data curves based on the size of the detection blind spot, thereby determining the fiber quality curve of the line in the detection blind spot; and obtaining the line fiber quality curve based on the fiber quality curve of the detection blind spot line and the fiber quality curve of the line in the non-detection blind spot line. This method solves the problem in the prior art of difficulty in accurately measuring fiber quality when the fiber distance between two stations exceeds the maximum measurement range.

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 optical transmission networks expand in size, network maintenance is placing a significant premium on fiber quality. Related technologies employ optical time-domain reflectometry, a common method for measuring fiber quality in optical networks. It can measure fiber length and line loss. However, existing OTDRs (Optical Time Domain Reflectometers) have limited pulse energy and dynamic range. This makes it difficult to accurately measure fiber quality when the fiber distance between two sites exceeds the maximum measurement range.

[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 needs to be urgently solved. Summary of the Invention

[0004] The embodiments of the present invention provide a method and system for determining line optical fiber quality 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, comprising the steps of:

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

[0007] If there is no detection blind area, the line 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, the source end data curve and the sink end data curve are offset, supplemented or attenuated according to the size of the detection blind area, thereby determining the optical fiber quality curve of the detection blind area line;

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

[0010] In combination with the first aspect, in one embodiment, determining whether there is a detection blind spot based on the delay value between the source and the sink, and the OTDR measurement data of the source and the sink, includes 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 fiber length at the source end and the measurable fiber length at the sink end based on 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 conjunction with the first aspect, in one embodiment, if there is no detection blind spot, determining the line fiber quality curve based on the source data curve and the sink 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 the source end data curve or the sink end data curve on one side of the intersection and the 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 embodiment, if a detection blind spot exists, 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, thereby determining the 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 curve segment 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] Determining an intersection point of the first source-end data curve and the first sink-end data curve;

[0021] A line 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 a 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 embodiment, determining whether the length of the detection blind zone 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] Obtaining 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 detection blind zone length is greater than the set value;

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

[0028] In conjunction with the first aspect, in one embodiment, a curve segment 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, 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 embodiment, if a detection blind spot exists, 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, thereby determining the 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] Determining 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] 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;

[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 conjunction with the first aspect, in one embodiment, determining the attenuation coefficient of the source and the standard attenuation coefficient of the sink based on the source and sink data curves under the multiple dynamic ranges includes:

[0038] Obtain the attenuation coefficients of the source and sink data curves under multiple dynamic ranges, and calculate the 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 coefficients of the source and sink data curves is less than a selected value; 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 embodiment, obtaining the second source data curve and the second sink data curve based on 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] Determining 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;

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

[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, comprising:

[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 connected to the other end of the line optical fiber;

[0049] A calculation device is used to determine whether there is a detection blind spot based on the time 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 spot, determine the line fiber quality curve based on the source end data curve and the sink end data curve; if there is a detection blind spot, perform offset completion or attenuation processing on the source end data curve and the sink end data curve according to the range of the detection blind spot, and then determine the fiber quality curve of the detection blind spot line; obtain the line fiber quality curve based on the fiber quality curve of the detection blind spot line and the fiber quality curve of the non-detection blind spot line.

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

[0051] The present invention provides a method and system for determining line fiber quality. These methods utilize system delay and line reference loss to integrate dual-end detection data based on actual OTDR measurement data. This improves the OTDR's detection dynamic range without increasing system costs. They also utilize existing network resources to measure long-distance fiber quality. This system can meet the needs of fiber quality detection at different distances without increasing operator network costs. 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 This is a data curve diagram of the OTDR measured using the maximum dynamic range in an embodiment of the present invention;

[0055] Figure 4 Schematic diagram of the merged line segments of the source curve and the sink curve without a detection blind area in an embodiment of the present invention;

[0056] Figure 5 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 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 present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, 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 this application clearer, the implementation methods of this 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 method for determining line optical fiber quality 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 equipped with an OTDR (Optical Time Domain Reflectometer) and an optical supervisory channel (OSC). The OTDR and OSC are coupled through a coupler and transmitted to the other end. The master control controls the OTDR and 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 and sink ends and the OTDR measurement data of the source and sink ends.

[0063] It should be understood that, when the source and sink clocks are synchronized, the delay between them is due to the time it takes for the optical signal to travel from the source to the sink. This delay can be used to calculate the transmission path length between the source and sink, which is also known as the fiber reference length. The OTDR measurement data at the source and sink indicate the effective distance that the OTDRs at each end can measure. Subtracting the two values ​​can determine whether a blind spot exists.

[0064] Specifically, the 1588 time synchronization technology can be used to synchronize the time between the source and the sink. 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 This is a data curve diagram obtained by measuring the maximum dynamic range of the OTDR in the embodiment of the present invention. It should be noted that the curves collected at the source and sink are different, but they all follow the Figure 3 The basic situation is that after a certain distance, the measured curve begins to be very irregular due to exceeding the measurement range of the OTDR, and the end of the regular curve is the end event of the OTDR. 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, step S10 may further include the following specific steps of determining whether a detection blind spot exists based on the delay value between the source and the sink, and the OTDR measurement data of the source and the sink:

[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: determining 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 source end and sink end OTDRs.

[0069] Step S13: determining whether there is a detection blind area based on 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, an OTDR is used at the source and sink ends to measure the measurable fiber lengths La and Lb, respectively, at the source and sink ends. If La + Lb ≥ L0, there is no detection blind spot.

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

[0072] If there is no detection blind area, the line 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 fiber quality curve based on 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 4This is a schematic diagram of a combined line segment of a source curve and a sink curve without a detection blind area in an embodiment of the present invention. Figure 5 The OTDR measurement data of the source end is the AC segment, the OTDR measurement data of the sink end is the BD segment, and the fitting point is calculated. In the source data curve, select the curve data [Ld, Pd]...[Lm, Pm] with the horizontal coordinates from Ld to the end event point, and record it as Data1. In the sink data curve, select the data [Lc, Pc]...[Leb, Peb] with the horizontal coordinates from Lc to Leb, and record it as Data2. Figure 4 , Ld is the x-coordinate position of the destination curve's endpoint on the source curve. Lc is the x-coordinate position of the source curve's endpoint on the destination curve. Lm is the source's endpoint event's x-coordinate, and Leb is the sink's endpoint event's x-coordinate. Since the source and sink curves intersect, to reduce the computational effort of calculating the intersection, it's not necessary to calculate the entire source and sink curves. Only the segment from the sink's endpoint event on the source curve to the source's endpoint event point is required for calculation, and similarly for the sink.

[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 merging 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. Here, the horizontal coordinate of the fitting point is calculated, 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 in the figure, C is the end event of the source curve, and the fitting point is the point on the source curve whose abscissa is Lδ away from C. If it is equal to 0, it is the end event C. The same applies to the sink curve.

[0080] After finding the intersection, flip the curve on one side of the intersection, that is, mirror it along the axis passing through the intersection and parallel to the horizontal axis, and you can get the line fiber quality curve.

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

[0082] If a detection blind area exists, offset complement or attenuation processing is performed on the source data curve and the sink data curve according to the size of the detection blind area, thereby determining the optical fiber quality curve of the detection blind area line.

[0083] In some scenarios, although a blind spot exists, it is not large and the curve changes little. In this case, a curve segment close to the blind spot can be used to fill in the blind spot. For example, offset filling can be used to fill in the entire data curve, thereby obtaining the fiber quality curve. If the blind spot is too large, the data curve may change significantly, and using offset filling may result in large errors, or even cause the final result to deviate significantly from the actual value. In this case, the attenuation of the curve needs to be considered. After calculating the attenuation, the curve of the blind spot is calculated based on the attenuation to obtain the fiber quality curve.

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

[0085] If a detection blind area exists, offset complement or attenuation processing is performed on the source data curve and the sink data curve according to the size of the detection blind area, thereby determining the optical fiber quality curve of the detection blind area line.

[0086] In some scenarios, although a blind spot exists, it is not large and the curve changes little. In this case, a curve segment close to the blind spot can be used to fill in the blind spot. For example, offset filling can be used to fill in the entire data curve, thereby obtaining the fiber quality curve. If the blind spot is too large, the data curve may change significantly, and using offset filling may result in large errors, or even cause the final result to deviate significantly from the actual value. In this case, the attenuation of the curve needs to be considered. After calculating the attenuation, the curve of the blind spot is calculated based on the attenuation to obtain the fiber quality curve.

[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 embodiment, it is first necessary to determine whether the length of the blind zone is greater than a set value. It should be understood that the set value can be adjusted according to needs, such as differences in OTDRs, accuracy requirements of usage scenarios, etc.

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

[0091] S311: Acquire 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, as previously described, the OTDR's end event coordinates can be derived from the measured data curve. Its abscissas E1 and E2 also represent the maximum measurable fiber lengths of the source and sink OTDRs.

[0093] S312: Acquire 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 gear 5db smaller than the maximum dynamic range is selected for measurement, thereby obtaining new end event horizontal coordinates E1′ and 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 zone is greater than a set value.

[0097] S315: Determine whether the length of the detection blind zone is greater than the 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 curve segment 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 sink 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 sink data curve is greater than L0. If it is greater, it means that there is no blind spot in the first source data curve and the first sink data curve after splicing. If it is less, 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 fiber quality curve according to 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 the 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 measure 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 under 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 under 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 under the above - mentioned multiple dynamic ranges and the average attenuation coefficients of the source - end and the sink - end.

[0116] S363: Judge whether the overall standard deviation of the attenuation coefficients of the above - mentioned source - end and sink - end data curves is less than the 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 of 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] Where [L1, P1] and [L2, P2] are two points on the curve, L2 is greater than L1, and the average attenuation coefficient is calculated. Then, the overall standard deviation δ1 of the attenuation coefficient of the source curve is calculated. If δ1 is less than or equal to α0 / 10, the attenuation is uniform, and 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, the attenuation is uneven, and the source attenuation coefficient θ1 = αn. The sink attenuation coefficient θ2 is then calculated using the same method. 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 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 end 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 source-end curve event Lm and Lj is N1 = (Lj-Lm) / γ, where γ is the source-end OTDR measurement resolution. The first point of the detection blind zone 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 zone data points L1′, L2′... Ln′ and substitutes them into formula (1) to calculate Calculate the ordinate Pj′ (j′=1, 2...N1) of the blind area data point; similarly, use θ2 to calculate the ordinate of the blind area data point to the right of the intersection point Lj.

[0130] By setting the attenuation coefficient distribution under multiple dynamic ranges (D1, D2, ..., Dn) based on the detectable range of existing devices, the attenuation blind zone can be calculated more objectively and accurately. Furthermore, since a larger dynamic range results in a closer data curve to the true value, when attenuation is relatively stable, the average attenuation coefficient is directly used as the source attenuation coefficient. If attenuation is less stable, the attenuation coefficient corresponding to the larger value in the selected dynamic range is used as the source attenuation coefficient.

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

[0132] In step S38: obtain the line fiber quality curve 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. 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 spot based on the time 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 spot, determine the line fiber quality curve based on the source end data curve and the sink end data curve; if there is a detection blind spot, perform offset completion or attenuation processing on the source end data curve and the sink end data curve according to the range of the detection blind spot, and then determine the fiber quality curve of the detection blind spot line; obtain the line fiber quality curve based on the fiber quality curve of the detection blind spot line and the fiber quality curve of the non-detection blind spot 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 the "first", "second" and "third" to different types.

[0139] In the description of the embodiments of this application, the words "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 this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[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; “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 are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed 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 the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, 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, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling 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 do not 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 ends and the OTDR measurement data of the source and sink ends; If there is no detection blind area, the line 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, the source end data curve and the sink end data curve are offset, supplemented or attenuated according to the size of the detection blind area, thereby determining the optical fiber quality curve of the detection blind area line; The line optical fiber quality curve is obtained based on the optical fiber quality curve of the detection blind area line and the optical fiber quality curve of the non-detection blind area line.

2. The method for determining line optical fiber quality according to claim 1, wherein: The method of determining whether there is a detection blind area based on the time 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 following steps: Calculate the reference length of the optical fiber based on the delay value between the source end and the sink end; Determine the measurable fiber length at the source end and the measurable fiber length at the sink end based on 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, wherein: 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 the source end data curve or the sink end data curve on one side of the intersection and the 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, wherein: If a detection blind spot exists, offset complement or attenuation processing is performed on the source data curve and the sink data curve according to the size of the detection blind spot, thereby determining the optical fiber quality curve of the detection blind spot 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 curve segment 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-end data curve and the first sink-end data curve; A line 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 a 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, wherein: The determining whether the length of the detection blind zone 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; Obtaining end event abscissas E1′ and E2′ of 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 detection blind zone length is greater than the set value; If it is less than or equal to, it is determined that the detection blind zone length is not greater than the set value.

6. The method for determining line optical fiber quality according to claim 5, wherein: Using a curve section from the end event position of the source and sink data curves to the starting point to splice 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 method for determining line optical fiber quality according to claim 1, wherein: If a detection blind spot exists, offset complement or attenuation processing is performed on the source data curve and the sink data curve according to the size of the detection blind spot, thereby determining the optical fiber quality curve of the detection blind spot 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; Determining 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; 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; 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, wherein: The determining, based on the source and sink data curves under the multiple dynamic ranges, the attenuation coefficient of the source and the standard attenuation coefficient of the sink, includes: Obtain the attenuation coefficients of the source and sink data curves under multiple dynamic ranges, and calculate the 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 coefficients of the source and sink data curves is less than a selected value; 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 method for determining line optical fiber quality according to claim 7, wherein: 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: Determining 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; The abscissa of each point in the blind area of ​​the source and sink data curves is obtained according to the abscissa of the end event position of the source and sink data curves and the OTDR resolution; 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 connected to the other end of the line optical fiber; a calculation device for determining whether a detection blind spot exists based on the time delay value between the source end and the sink end and the OTDR measurement data of the source end and the sink end; and if no detection blind spot exists, determining a line optical fiber quality curve based on the source end data curve and the sink end data curve; If there is a detection blind area, the source end data curve and the sink end data curve are offset, supplemented or attenuated according to the size of the detection blind area, thereby determining the optical fiber quality curve of the detection blind area line; The line optical fiber quality curve is obtained based on the optical fiber quality curve of the detection blind area line and the optical fiber quality curve of the non-detection blind area line.

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