Track zero calibration method of optical time domain reflectometer and related product

Abstract

The invention discloses a track zero calibration method of an optical time domain reflectometer and a related product, and the method comprises the steps that the optical time domain reflectometer emits a short pulse signal which sequentially passes through a reference optical fiber and an optical fiber to be measured, an original track curve corresponding to the short pulse signal is obtained, the reference optical fiber is arranged in the optical time domain reflectometer, and the reference optical fiber is arranged in the optical time domain reflectometer; the length of the reference optical fiber is greater than the spatial resolution of short pulse signal scanning; based on the original trajectory curve, determining reflected light power corresponding to the reference optical fiber; obtaining a first translation amount of the original trajectory curve based on the reflected light power corresponding to the reference optical fiber; and translating the original trajectory curve based on the first translation amount, completing calibration of a zero point, and obtaining an absolute loss trajectory curve corresponding to the to-be-measured optical fiber. Therefore, after zero calibration, the longitudinal axis value of the absolute loss trajectory curve can directly correspond to the absolute loss of each position of the optical fiber to be measured, and the trajectory curves of the same optical fiber at different moments can be conveniently compared, so that the readability of the trajectory curve is improved.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, and in particular to a method for zero-point calibration of the trajectory of an optical time domain reflectometer and related products. Background Technology

[0002] An optical time-domain reflectometer (OTDR) is a high-precision instrument widely used for testing and diagnostics of optical fiber communication networks. By emitting optical pulses into an optical fiber and analyzing its backscattered signals, such as reflections caused by Rayleigh scattering or Fresnel reflections, it can accurately measure the fiber's length, attenuation coefficient, connection point loss, and fault location. It is an indispensable testing device in modern optical network maintenance.

[0003] In existing technologies, the reflected optical power at the endpoint of the fiber under test is typically used as the zero point of the vertical axis of the OTDR trajectory curve. However, there is usually a connection point between the endpoint of the fiber under test and the OTDR output port. This connection point generates strong Fresnel reflection, which masks the Rayleigh scattering signal near the endpoint of the fiber under test, leading to uncertainty in the zero point of the vertical axis. Therefore, inaccurate calibration of the zero point of the vertical axis will cause a shift in the overall reference position of the OTDR trajectory curve, resulting in poor readability of the trajectory curve and making it difficult to intuitively reflect the absolute loss changes at various locations of the fiber under test. Summary of the Invention

[0004] This application provides a method for zero-point calibration of the trajectory of an optical time domain reflectometer and related products, which can significantly improve the readability of the trajectory curve and quickly obtain the absolute loss information of each position of the optical fiber under test.

[0005] In a first aspect, embodiments of this application provide a method for zero-point calibration of the trajectory of an optical time-domain reflectometer, including:

[0006] An optical time domain reflectometer emits a short pulse signal that passes sequentially through a reference fiber and a fiber under test to obtain the original trajectory curve corresponding to the short pulse signal. The reference fiber is built into the optical time domain reflectometer, and the length of the reference fiber is greater than the spatial resolution of the short pulse signal scan.

[0007] Based on the original trajectory curve, the reflected light power corresponding to the reference fiber is determined;

[0008] Based on the reflected light power corresponding to the reference fiber, the first translation amount of the original trajectory curve is obtained;

[0009] The original trajectory curve is translated based on the first translation amount to complete the calibration of the zero point and obtain the absolute loss trajectory curve corresponding to the optical fiber under test.

[0010] One feasible implementation involves determining the reflected optical power of the reference fiber based on the original trajectory curve, including:

[0011] Based on the original trajectory curve and the length of the reference fiber, the reflected light power corresponding to the end of the reference fiber is determined.

[0012] In one feasible implementation, before the optical time-domain reflectometer emits a long pulse signal, the method further includes:

[0013] Based on the original trajectory curve, determine the first reflected light power corresponding to the target reference point on the optical fiber to be tested that is far from the reflection event;

[0014] The relative loss power is obtained based on the reflected light power of the reference fiber and the first reflected light power.

[0015] One feasible implementation, wherein obtaining the relative loss power based on the reflected optical power of the reference fiber and the first reflected optical power, includes:

[0016] The relative loss power is obtained by subtracting the reflected light power of the reference optical fiber from the first reflected light power.

[0017] In one feasible implementation, when the optical time-domain reflectometer emits a long pulse signal, the method further includes:

[0018] An optical time domain reflectometer emits a long pulse signal that passes sequentially through the reference fiber and the fiber under test to obtain the initial trajectory curve corresponding to the long pulse signal;

[0019] Based on the initial trajectory curve, determine the second reflected light power corresponding to the target reference point on the optical fiber to be tested that is far from the reflection event;

[0020] Based on the relative loss power and the second reflected light power, the second translation amount of the initial trajectory curve is obtained;

[0021] The initial trajectory curve is translated based on the second translation amount to complete the calibration of the zero point and obtain the absolute loss trajectory curve corresponding to the optical fiber under test.

[0022] One feasible implementation, wherein obtaining the second translation amount of the initial trajectory curve based on the relative loss power and the second reflected light power, includes:

[0023] The relative loss power is added to the second reflected light power to obtain the second translation amount of the initial trajectory curve.

[0024] Secondly, embodiments of this application provide a trajectory zero-point calibration device for an optical time-domain reflectometer, comprising:

[0025] The curve acquisition module is used to obtain the original trajectory curve corresponding to the short pulse signal by having the optical time domain reflectometer emit a short pulse signal and pass it sequentially through a reference fiber and a fiber under test. The reference fiber is built into the optical time domain reflectometer and its length is greater than the spatial resolution of the short pulse signal scan.

[0026] A power determination module is used to determine the reflected light power of the reference optical fiber based on the original trajectory curve.

[0027] The translation amount determination module is used to obtain the first translation amount of the original trajectory curve based on the reflected light power corresponding to the reference optical fiber;

[0028] The translation module is used to translate the original trajectory curve based on the first translation amount, complete the calibration of the zero point, and obtain the absolute loss trajectory curve corresponding to the optical fiber under test.

[0029] One feasible implementation is characterized in that the power determination module is specifically used for:

[0030] Based on the original trajectory curve and the length of the reference fiber, the reflected light power corresponding to the end of the reference fiber is determined.

[0031] Thirdly, embodiments of this application provide an electronic device, the device including: a processor, a memory, and a system bus;

[0032] The processor and the memory are connected via the system bus;

[0033] The memory is used to store a program, which includes instructions that, when executed by the processor, cause the processor to perform any of the implementation steps of the above-described trajectory zero-point calibration method for an optical time-domain reflectometer.

[0034] Fourthly, embodiments of this application provide a computer-readable storage medium for storing a computer program, which, when executed by a terminal device, implements any of the implementation steps of the above-described trajectory zero-point calibration method for an optical time-domain reflectometer.

[0035] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0036] In this embodiment, firstly, an optical time-domain reflectometer (OTDR) emits a short-pulse signal that passes sequentially through a reference fiber and the fiber under test (DUT) to obtain the original trajectory curve corresponding to the short-pulse signal. The reference fiber is embedded within the OTD and its length is greater than the spatial resolution of the short-pulse signal scan. Then, based on the original trajectory curve, the reflected light power corresponding to the reference fiber is determined, and based on the determined reflected light power, a first shift amount is obtained for the original trajectory curve. Finally, the original trajectory curve is shifted using the first shift amount to complete the zero-point calibration, thereby obtaining the absolute loss trajectory curve corresponding to the DUT.

[0037] As can be seen, this scheme, by embedding a reference fiber within the optical time-domain reflectometer, ensures that the reflected optical power corresponding to the reference fiber is unaffected by reflections from external connection points or output ports. Furthermore, the length of the reference fiber exceeds the spatial resolution of the short-pulse signal scan, allowing for accurate measurement of the reflected optical power. Based on this reflected optical power, the first shift of the original trajectory curve can be obtained. This first shift is then used to accurately calibrate the zero point of the original trajectory curve's vertical axis, thus completing the zero-point calibration. This ensures that the vertical axis value of each point in the fiber under test accurately reflects its absolute loss relative to the fiber's endpoint, thereby obtaining the absolute loss trajectory curve of the fiber under test. Therefore, compared to existing technologies, the vertical axis value of the absolute loss trajectory curve in this scheme directly corresponds to the absolute loss at each position in the fiber under test, facilitating comparison of trajectory curves of the same fiber at different times, thereby improving the readability of the trajectory curve. Attached Figure Description

[0038] Figure 1 A flowchart illustrating a trajectory zero-point calibration method for an optical time domain reflectometer provided in this application embodiment;

[0039] Figure 2 This application provides a schematic diagram of the structure of an optical time domain reflectometer with a built-in reference fiber.

[0040] Figure 3 An original trajectory curve diagram provided for an embodiment of this application;

[0041] Figure 4 A magnified view of the proximal end of an original trajectory curve provided in an embodiment of this application;

[0042] Figure 5 A schematic diagram illustrating the calculation of relative power loss provided in an embodiment of this application;

[0043] Figure 6 An initial trajectory curve diagram provided for an embodiment of this application;

[0044] Figure 7 This is a schematic diagram illustrating the calculation of a second translation amount provided in an embodiment of this application;

[0045] Figure 8 A zero-point calibration curve of a short pulse signal provided in an embodiment of this application;

[0046] Figure 9 A zero-point calibration curve of a long pulse signal provided in an embodiment of this application;

[0047] Figure 10 A schematic diagram illustrating the absolute loss variation of a long pulse signal at different times, provided as an embodiment of this application;

[0048] Figure 11 This is a schematic diagram of the trajectory zero-point calibration device for an optical time domain reflectometer provided in an embodiment of this application. Detailed Implementation

[0049] As mentioned earlier, an OTDR is a high-precision instrument widely used for testing and diagnostics of fiber optic communication networks. By emitting light pulses into the optical fiber and analyzing its backscattered signals, such as reflections caused by Rayleigh scattering or Fresnel reflections, it can accurately measure the fiber length, attenuation coefficient, connection point loss, and fault location, making it an indispensable testing device in modern optical network maintenance.

[0050] Furthermore, the trajectory curve of an OTDR can reflect the distribution along the fiber. The horizontal axis represents the length of the fiber, and the vertical axis represents the reflected light power at the end of the fiber under test reflected back to the OTDR pulse output. Logarithmic coordinates are typically used. Since the energy of the light pulse emitted by the OTDR is uncertain due to the influence of pulse width and laser characteristics, the reflected light power displayed on the vertical axis is mainly used to reflect the relative magnitude of the reflected light intensity at different locations, and its absolute value itself does not have a clear physical meaning.

[0051] Currently, the industry commonly uses the reflected optical power with a signal-to-noise ratio of 1 as the zero point of the vertical axis. However, this method cannot accurately and intuitively reflect the absolute loss of the fiber under test at each length position relative to the fiber's endpoint. Another method is to set the reflected optical power at the fiber's endpoint as the zero point of the vertical axis. However, since there must be a connection point between the fiber's endpoint and the OTDR pulse output port, this connection point will generate strong Fresnel reflection, masking the Rayleigh scattering signal near the fiber's endpoint, leading to uncertainty in the zero point of the vertical axis. Furthermore, due to limitations in pulse width and sampling frequency, reflection events occurring at the connection point will create an event blind zone in its vicinity, meaning that high reflected optical power may be detected within a certain range. The strong reflection at the connection point masks the actual Rayleigh reflection intensity of the fiber within that range, and the magnitude of the reflected power is also affected by factors such as the quality of the connection point and the cleanliness of the connection section, resulting in numerical uncertainty. If the reflected optical power at this zero point is used as the zero point of the vertical axis, it is equivalent to introducing an uncertain additional deviation into the trajectory curve of the fiber under test, thus causing the absolute loss of the fiber reflected by the trajectory curve to be too high.

[0052] To address the aforementioned issues, this application provides a method for zero-point calibration of an optical time-domain reflectometer (OTDR) and related products. First, the OTD emits a short-pulse signal that passes sequentially through a reference fiber and the fiber under test, obtaining the original trajectory curve corresponding to the short-pulse signal. The reference fiber is embedded within the OTD, and its length is greater than the spatial resolution of the short-pulse signal scan. Then, based on the original trajectory curve, the reflected light power corresponding to the reference fiber is determined, and a first translation amount is obtained based on this determined reflected light power. Finally, the original trajectory curve is shifted using the first translation amount to complete the zero-point calibration, thereby obtaining the absolute loss trajectory curve corresponding to the fiber under test.

[0053] As can be seen, this scheme, by embedding a reference fiber within the optical time-domain reflectometer, ensures that the reflected optical power corresponding to the reference fiber is unaffected by reflections from external connection points or output ports. Furthermore, the length of the reference fiber exceeds the spatial resolution of the short-pulse signal scan, allowing for accurate measurement of the reflected optical power. Based on this reflected optical power, the first shift of the original trajectory curve can be obtained. This first shift is then used to accurately calibrate the zero point of the original trajectory curve's vertical axis, thus completing the zero-point calibration. This ensures that the vertical axis value of each point in the fiber under test accurately reflects its absolute loss relative to the fiber's endpoint, thereby obtaining the absolute loss trajectory curve of the fiber under test. Therefore, compared to existing technologies, the vertical axis value of the absolute loss trajectory curve in this scheme directly corresponds to the absolute loss at each position in the fiber under test, facilitating comparison of trajectory curves of the same fiber at different times, thereby improving the readability of the trajectory curve.

[0054] It should be noted that the implementation subject of the trajectory zero-point calibration method for an optical time domain reflectometer is not limited in the embodiments of this application. For example, the trajectory zero-point calibration method for an optical time domain reflectometer in the embodiments of this application can be applied to information processing devices such as servers or terminal devices. The server can be a standalone server, a cluster server, or a cloud server. The terminal device can be an electronic device such as a smartphone, computer, personal digital assistant (PDA), or tablet computer.

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0056] Figure 1 This is a flowchart illustrating a method for zero-point calibration of the trajectory of an optical time-domain reflectometer, provided in an embodiment of this application. (In conjunction with...) Figure 1 As shown, it may include steps S101-S104.

[0057] S101: The optical time domain reflectometer emits short pulse signals that pass sequentially through the reference fiber and the fiber under test to obtain the original trajectory curve corresponding to the short pulse signal. The reference fiber is built into the optical time domain reflectometer, and the length of the reference fiber is greater than the spatial resolution of the short pulse signal scan.

[0058] In the embodiments of this application, Figure 2 This application provides a schematic diagram of the structure of an optical time domain reflectometer with a built-in reference fiber, combined with... Figure 2 It can be seen that by incorporating a reference fiber into the optical time domain reflectometer, the short pulse signal emitted by the optical time domain reflectometer first passes through the reference fiber and then through the fiber under test, thereby obtaining the original trajectory curve corresponding to the short pulse signal. Figure 3 An original trajectory curve diagram provided for embodiments of this application is generated by... Figure 3 As can be seen, the horizontal axis represents the fiber length in meters (m), and the vertical axis represents the reflected light power in decibels (dB). The zero point of the vertical axis is selected at a signal-to-noise ratio of 1. Furthermore, multiple reflection events can be observed at the near end of the optical time-domain reflectometer.

[0059] In addition, the length of the reference fiber must be greater than the spatial resolution of the short pulse signal scan. During the short pulse signal scan, the reflection events of the reference fiber of the optical time domain reflectometer will not overlap with the dead zone of the reflection events at the output port.

[0060] S102: Determine the reflected light power corresponding to the reference fiber based on the original trajectory curve.

[0061] In this embodiment of the application, the reflected light power corresponding to the end of the reference fiber can be determined based on the original trajectory curve and the length of the reference fiber. Figure 4 A magnified view of the proximal end of the original trajectory curve provided in an embodiment of this application, such as... Figure 4 As shown, when the length of the reference fiber is set to 10 meters, that is, the position of 10 meters of the horizontal axis fiber length is taken as the reflection point of the reference fiber, and the corresponding vertical axis reflected light power is 1.9 dB.

[0062] Furthermore, when an optical time domain reflectometer (OTDR) emits long pulse signals for measurement, the reflected optical power may be affected by the internal optical components and connection points of the OTDR due to the limited length of the reference fiber, and thus can no longer accurately reflect the reflected optical power at the zero-position point. Therefore, it is necessary to first emit short pulse signals in the OTDR and, based on the obtained original trajectory curve, determine the first reflected optical power corresponding to the target reference point on the fiber under test that is far from the reflection event. Figure 5 This is a schematic diagram illustrating the calculation of relative power loss in an embodiment of this application, combined with... Figure 5 As shown, for example, a 200-meter-long optical fiber is set as the target reference point, and its corresponding reflected light power is 1.36 dB, which is taken as the first reflected light power. Subsequently, based on the reflected light power of 1.9 dB corresponding to the reference fiber and the first reflected light power of 1.36 dB, the relative loss power can be obtained. Specifically, subtracting the first reflected light power from the reflected light power corresponding to the reference fiber yields a relative loss power of 0.54 dB.

[0063] Next, after completing the above operations, Figure 6 An initial trajectory curve diagram provided in this application embodiment, combined with Figure 6 As shown, an optical time-domain reflectometer (OTDR) can emit long pulse signals that pass sequentially through a reference fiber and the fiber under test, thereby obtaining the initial trajectory curve corresponding to the long pulse signal. Based on this initial trajectory curve, the second reflected optical power corresponding to a target reference point 200 meters away from the reflection event on the fiber under test can be determined.

[0064] S103: Based on the reflected light power corresponding to the reference fiber, obtain the first translation amount of the original trajectory curve.

[0065] In this embodiment of the application, when the optical time domain reflectometer emits a short pulse signal, the reflected light power of 1.9 dB corresponding to the reference fiber is used as the first translation amount of the original trajectory curve.

[0066] When the optical time-domain reflectometer emits a long pulse signal Figure 7This is a schematic diagram illustrating the calculation of a second translation amount provided in an embodiment of this application, combined with... Figure 7 It can be seen that, based on the relative loss power and the second reflected light power calculated above, the second translation amount of the initial trajectory curve can be obtained. Specifically, by adding the relative loss power of 0.54 dB to the second reflected light power of 22.46 dB corresponding to the target reference point of 200 meters, the second translation amount of the initial trajectory curve is obtained as 23 dB.

[0067] S104: The original trajectory curve is translated based on the first translation amount to complete the calibration of the zero point and obtain the absolute loss trajectory curve corresponding to the optical fiber under test.

[0068] In the embodiments of this application, Figure 8 The zero-point calibration curve of a short pulse signal provided in this application embodiment is as follows: when the optical time domain reflectometer emits a short pulse signal, the original trajectory curve is shifted based on a first shift amount, that is, the original trajectory curve is shifted downward by 1.9 dB, thereby completing the zero-point calibration. The curve after zero-point calibration is the absolute loss trajectory curve corresponding to the optical fiber under test, and the value on its vertical axis can directly represent the absolute loss value from the corresponding position to the end point of the optical fiber under test.

[0069] Figure 9 A zero-point calibration curve of a long pulse signal provided in this application embodiment, combined with Figure 9 As shown, when the optical time-domain reflectometer emits a long pulse signal, the initial trajectory curve can be shifted based on the second shift amount, that is, the initial trajectory curve is shifted downward by 23 dB, thereby completing the zero-point calibration. The calibrated curve is the absolute loss trajectory curve corresponding to the fiber under test. It should be noted that on this absolute loss trajectory curve, the reflected optical power along the vertical axis at any fiber length position is the absolute loss power at that position. For example, at a fiber length of 80 km, the corresponding absolute loss power is 17.4 dB.

[0070] Furthermore, after completing the zero-point calibration, Figure 10 This is a schematic diagram illustrating the absolute loss variation of a long pulse signal at different times, provided as an embodiment of this application. The reflected power corresponding to the absolute loss trajectory curve in the diagram represents the absolute loss variation of the optical fiber under test relative to the entrance. Combined with... Figure 10As can be seen, by comparing the absolute loss trajectory curves of the same fiber under test at times T1 and T2, the absolute loss change of the fiber under test at different times can be clearly obtained, making the analysis of the fiber under test more readable. For example, at a fiber length of 40 kilometers, the absolute loss trajectory curve at time T1 and the loss trajectory curve at time T2 have changed, which means that the loss characteristics of the fiber under test have changed at a length of 40 kilometers. This could be due to fiber damage, breakage, aging, or the influence of external environmental factors, resulting in a significant change in the optical loss characteristics at this location.

[0071] As the above analysis shows, by calibrating the trajectory curves with zero points based on the corresponding translation amounts under different pulse signals emitted by the optical time-domain reflectometer (OTDR), consistent calibration of the vertical axis zero point of the trajectory curves under different measurement conditions can be achieved. Through this calibration process, the calibrated trajectory curves can accurately reflect the absolute loss values ​​at each position of the fiber under test, thus enabling rapid acquisition of absolute loss information at each position of the fiber.

[0072] Based on the relevant content of steps S101-S104 above, in this embodiment, firstly, the optical time-domain reflectometer (OTDR) emits a short pulse signal that passes sequentially through a reference fiber and the fiber under test, obtaining the original trajectory curve corresponding to the short pulse signal. The reference fiber is embedded within the OTD, and its length is greater than the spatial resolution of the short pulse signal scan. Subsequently, based on the original trajectory curve, the reflected optical power corresponding to the reference fiber is determined, and based on the determined reflected optical power, a first translation amount is obtained for the original trajectory curve. Finally, the original trajectory curve is translated using the first translation amount to complete the zero-point calibration, thereby obtaining the absolute loss trajectory curve corresponding to the fiber under test. It can be seen that this scheme, by embedding a reference fiber within the OTD, ensures that the reflected optical power corresponding to the reference fiber is not affected by reflections from external connection points or output ports. Simultaneously, the length of the reference fiber is greater than the spatial resolution of the short pulse signal scan, allowing for accurate measurement of the reflected optical power corresponding to the reference fiber. Based on the reflected light power, the first shift of the original trajectory curve can be obtained. This first shift is then used to accurately calibrate the zero point of the original trajectory curve's vertical axis, thus completing the zero-point calibration. This ensures that the vertical axis value of each point in the fiber under test accurately reflects its absolute loss relative to the fiber's endpoint, thereby obtaining the absolute loss trajectory curve of the fiber under test. Therefore, compared to existing technologies, the vertical axis value of the absolute loss trajectory curve in this scheme directly corresponds to the absolute loss at each position in the fiber under test. It also facilitates comparison of trajectory curves of the same fiber at different times, thereby improving the readability of the trajectory curve.

[0073] Furthermore, Figure 11This is a schematic diagram of the trajectory zero-point calibration device for an optical time-domain reflectometer provided in an embodiment of this application. (Combined with...) Figure 11 As shown in the embodiment of this application, the trajectory zero-point calibration device 1100 of the optical time domain reflectometer may include:

[0074] The curve acquisition module 1101 is used to obtain the original trajectory curve corresponding to the short pulse signal by transmitting a short pulse signal through the optical time domain reflectometer sequentially through the reference fiber and the fiber under test. The reference fiber is built into the optical time domain reflectometer and the length of the reference fiber is greater than the spatial resolution of the short pulse signal scan.

[0075] The power determination module 1102 is used to determine the reflected light power of the reference optical fiber based on the original trajectory curve.

[0076] The translation amount determination module 1103 is used to obtain the first translation amount of the original trajectory curve based on the reflected light power corresponding to the reference optical fiber;

[0077] The translation module 1104 is used to translate the original trajectory curve based on the first translation amount, complete the calibration of the zero point, and obtain the absolute loss trajectory curve corresponding to the optical fiber under test.

[0078] Optionally, the power determination module 1102 is specifically used for:

[0079] Based on the original trajectory curve and the length of the reference fiber, the reflected light power corresponding to the end of the reference fiber is determined.

[0080] Optionally, before the optical time domain reflectometer transmits a long pulse signal, the trajectory zero-point calibration device 1100 of the optical time domain reflectometer may include:

[0081] The first reflected light power determination module is used to determine the first reflected light power corresponding to the target reference point on the optical fiber under test that is far away from the reflection event, based on the original trajectory curve.

[0082] The relative loss power determination module is used to obtain the relative loss power based on the reflected light power of the reference optical fiber and the first reflected light power.

[0083] Optionally, the relative loss power determination module is specifically used for:

[0084] The relative loss power is obtained by subtracting the reflected light power of the reference optical fiber from the first reflected light power.

[0085] Optionally, when the optical time domain reflectometer emits a long pulse signal, the trajectory zero-point calibration device 1100 of the optical time domain reflectometer may include:

[0086] An initial trajectory curve generation module is used to obtain the initial trajectory curve corresponding to the long pulse signal by having the optical time domain reflectometer emit a long pulse signal that passes sequentially through the reference optical fiber and the optical fiber under test.

[0087] The second reflected light power determination module is used to determine the second reflected light power corresponding to the target reference point on the optical fiber under test that is far away from the reflection event, based on the initial trajectory curve.

[0088] The second translation amount generation module is used to obtain the second translation amount of the initial trajectory curve based on the relative loss power and the second reflected light power;

[0089] The curve translation module is used to translate the initial trajectory curve based on the second translation amount, complete the calibration of the zero point, and obtain the absolute loss trajectory curve corresponding to the optical fiber under test.

[0090] Optionally, the second translation amount generation module is specifically used for:

[0091] The relative loss power is added to the second reflected light power to obtain the second translation amount of the initial trajectory curve.

[0092] Furthermore, embodiments of this application also provide an electronic device, including: a processor, a memory, and a system bus;

[0093] The processor and the memory are connected via the system bus;

[0094] The memory is used to store one or more programs, the one or more programs including instructions that, when executed by the processor, cause the processor to perform any of the implementation steps of the above-described trajectory zero-point calibration method for an optical time-domain reflectometer.

[0095] Furthermore, embodiments of this application also provide a computer-readable storage medium for storing a computer program, which, when executed by a terminal device, implements any of the implementation steps of the above-described trajectory zero-point calibration method for an optical time-domain reflectometer.

[0096] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application. It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on describing the differences from other embodiments. The same or similar parts between the various embodiments can be referred to mutually.

[0097] The system disclosed in the embodiments is described in a relatively simple manner because it corresponds to the method disclosed in the embodiments. For relevant details, please refer to the method section.

[0098] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0099] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for zero-point calibration of the trajectory of an optical time-domain reflectometer, characterized in that, The method includes: An optical time domain reflectometer emits a short pulse signal that passes sequentially through a reference fiber and a fiber under test to obtain the original trajectory curve corresponding to the short pulse signal. The reference fiber is built into the optical time domain reflectometer, and the length of the reference fiber is greater than the spatial resolution of the short pulse signal scan. Based on the original trajectory curve, the reflected light power corresponding to the reference fiber is determined; Based on the reflected light power corresponding to the reference fiber, the first translation amount of the original trajectory curve is obtained; The original trajectory curve is translated based on the first translation amount to complete the calibration of the zero point and obtain the absolute loss trajectory curve corresponding to the optical fiber under test.

2. The method according to claim 1, characterized in that, Based on the original trajectory curve, the reflected optical power corresponding to the reference fiber is determined, including: Based on the original trajectory curve and the length of the reference fiber, the reflected light power corresponding to the end of the reference fiber is determined.

3. The method according to claim 1, characterized in that, Before the optical time-domain reflectometer emits a long pulse signal, the method further includes: Based on the original trajectory curve, determine the first reflected light power corresponding to the target reference point on the optical fiber to be tested that is far from the reflection event; The relative loss power is obtained based on the reflected light power of the reference fiber and the first reflected light power.

4. The method according to claim 3, characterized in that, The process of obtaining the relative loss power based on the reflected optical power of the reference fiber and the first reflected optical power includes: The relative loss power is obtained by subtracting the reflected light power of the reference optical fiber from the first reflected light power.

5. The method according to claim 3, characterized in that, When the optical time-domain reflectometer emits a long pulse signal, the method further includes: An optical time domain reflectometer emits a long pulse signal that passes sequentially through the reference fiber and the fiber under test to obtain the initial trajectory curve corresponding to the long pulse signal; Based on the initial trajectory curve, determine the second reflected light power corresponding to the target reference point on the optical fiber to be tested that is far from the reflection event; Based on the relative loss power and the second reflected light power, the second translation amount of the initial trajectory curve is obtained; The initial trajectory curve is translated based on the second translation amount to complete the calibration of the zero point and obtain the absolute loss trajectory curve corresponding to the optical fiber under test.

6. The method according to claim 5, characterized in that, The step of obtaining the second translation amount of the initial trajectory curve based on the relative loss power and the second reflected light power includes: The relative loss power is added to the second reflected light power to obtain the second translation amount of the initial trajectory curve.

7. A trajectory zero-point calibration device for an optical time-domain reflectometer, characterized in that, include: The curve acquisition module is used to obtain the original trajectory curve corresponding to the short pulse signal by having the optical time domain reflectometer emit a short pulse signal and pass it sequentially through a reference fiber and a fiber under test. The reference fiber is built into the optical time domain reflectometer and its length is greater than the spatial resolution of the short pulse signal scan. A power determination module is used to determine the reflected light power of the reference optical fiber based on the original trajectory curve. The translation amount determination module is used to obtain the first translation amount of the original trajectory curve based on the reflected light power corresponding to the reference optical fiber; The translation module is used to translate the original trajectory curve based on the first translation amount, complete the calibration of the zero point, and obtain the absolute loss trajectory curve corresponding to the optical fiber under test.

8. The apparatus according to claim 7, characterized in that, The power determination module is specifically used for: Based on the original trajectory curve and the length of the reference fiber, the reflected light power corresponding to the end of the reference fiber is determined.

9. An electronic device, characterized in that, The device includes: a processor, a memory, and a system bus; The processor and the memory are connected via the system bus; The memory is used to store a program, the program including instructions that, when executed by the processor, cause the processor to perform the steps of the trajectory zero-point calibration method of the optical time-domain reflectometer according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store a computer program, which, when executed by a terminal device, implements the steps of the trajectory zero-point calibration method of the optical time-domain reflectometer according to any one of claims 1 to 6.

Images