WO2020168833A1

WO2020168833A1 - Optical fiber monitoring method and device

Info

Publication number: WO2020168833A1
Application number: PCT/CN2019/130587
Authority: WO
Inventors: 张明超; 刘建国; 朱晓宇; 康杰
Original assignee: 中兴通讯股份有限公司
Priority date: 2019-02-21
Filing date: 2019-12-31
Publication date: 2020-08-27
Also published as: CN111595241A; CN111595241B

Abstract

An optical fiber monitoring method and device. Two ends of an optical fiber are respectively provided with a first OTDR and a second OTDR, and an opposite end of each OTDR on the optical fiber is provided with a light reflecting apparatus. The monitoring method comprises: after the first OTDR and the second OTDR are used to respectively emit probe light signals, respectively acquiring measurement data of the first OTDR and measurement data of the second OTDR; and performing synthesis processing on the measurement data of the first OTDR and the measurement data of the second OTDR to obtain unified optical fiber measurement data.

Description

Optical fiber monitoring method and equipment

Technical field

The embodiments of the present disclosure relate to, but are not limited to, optical fiber monitoring technology.

Background technique

Optical Time Domain Reflectometer (OTDR) is a commonly used instrument for measuring optical fiber parameters. It can measure fiber length, attenuation, and event points (bends, connectors, break points, and fusion points) in the fiber. The working principle of OTDR is to emit light pulse signals into the optical fiber, detect the backscattered and reflected optical power, and calculate the attenuation and reflection of different lengths of the optical fiber according to the intensity and time sequence of the reflected light. At the same time, it can calculate the total optical fiber Attenuation and length.

If the fiber under test is longer than the dynamic range of the OTDR measurement, the OTDR cannot detect the fiber outside the dynamic range. In response to this problem, a dual-ended OTDR solution has been proposed in related technologies, that is, OTDR devices are installed at both ends of the optical fiber to increase the effective detection distance of the OTDR to the optical fiber. However, the above-mentioned dual-ended OTDR solution can only increase the OTDR pair The effective detection distance of the optical fiber, but the total length of the optical fiber cannot be known, and thus the measurement curve of the optical fiber attenuation cannot be accurately and uniformly presented.

Summary of the invention

The embodiment of the present disclosure provides an optical fiber monitoring method. A first OTDR and a second OTDR are respectively provided at both ends of the optical fiber, and a light reflecting device is provided at the opposite end of each OTDR on the optical fiber. The method includes: After the first OTDR and the second OTDR are used to respectively emit the detection light signal, the measurement data of the first OTDR and the measurement data of the second OTDR are respectively obtained; and the measurement data of the first OTDR and the second OTDR Two OTDR measurement data are combined and processed to obtain unified optical fiber measurement data.

The embodiment of the present disclosure also provides an optical fiber monitoring device, which includes: a controller, a first OTDR and a second OTDR respectively provided at both ends of the optical fiber, and an optical fiber monitoring device provided at the opposite end of each OTDR. A reflection device, wherein the controller is configured to obtain the measurement data of the first OTDR and the measurement data of the second OTDR after the first OTDR and the second OTDR respectively emit the detection light signal; The measurement data of the second OTDR and the measurement data of the second OTDR are combined to obtain unified optical fiber measurement data.

Description of the drawings

Figure 1 is a schematic diagram of measuring optical fiber parameters using single-ended OTDR in related technologies;

2A and 2B are schematic diagrams of OTDR measurement data represented by power curves in related technologies;

Figure 3 is a schematic diagram of measuring optical fiber parameters using a double-ended OTDR solution in related technologies;

Fig. 4 is a schematic diagram of measurement curves of optical fiber attenuation respectively presented by adopting a double-ended OTDR scheme in related technologies;

5 is a schematic diagram of measuring optical fiber parameters using a single-ended OTDR according to an embodiment of the present disclosure;

6 is a schematic diagram of measuring optical fiber parameters using a double-ended OTDR solution according to an embodiment of the present disclosure;

Fig. 7 is a flowchart of an optical fiber monitoring method according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a power curve obtained by using a single-ended OTDR according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a power curve obtained by using a dual-ended OTDR solution according to an embodiment of the present disclosure;

10 is a schematic diagram of the power curve of OTDR1 and the power curve of OTDR2 displayed in the same coordinate system according to an embodiment of the present disclosure;

FIG. 11 is a schematic diagram after splicing the power curve shown in FIG. 10 according to an embodiment of the present disclosure;

12 is a schematic diagram of a unified optical fiber test curve shown in a double-ended OTDR solution according to an embodiment of the present disclosure;

FIG. 13 is a schematic diagram of the power curve of OTDR1 and the power curve of OTDR2 displayed in the same coordinate system when an event point exists in the optical fiber according to an embodiment of the present disclosure;

14 is a schematic diagram of a unified optical fiber test curve shown in a double-ended OTDR solution according to an embodiment of the present disclosure;

Fig. 15 is a schematic diagram of a structure for acquiring measurement data of two OTDRs according to an embodiment of the present disclosure;

FIG. 16 is a schematic diagram of another structure for obtaining measurement data of two OTDRs according to an embodiment of the present disclosure; and

Fig. 17 is a schematic diagram of circuit connections involved in an optical fiber monitoring device according to an embodiment of the present disclosure.

detailed description

The present disclosure will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, but not used to limit the present disclosure.

Figure 1 is a schematic diagram of using a single-ended OTDR to measure optical fiber parameters in related technologies.

As shown in Figure 1, the optical signals from service wavelength 1 to service wavelength n are selected by the data selector (MUX) and output. The optical signal output by the MUX is processed by the optical amplifier and then output to the first port of the multiplexer WDM. n represents a natural number greater than or equal to 1. In OTDR, the probe light pulse sent by the OTDR is sent to port 1 of the three-port circulator or coupler D, and port 3 of the three-port circulator or coupler D is used to receive the return signal (for example, reflected signal, scattered signal) Etc.), port 2 of the three-port circulator or coupler D is used to connect the second port of the WDM multiplexer. The third port of WDM is connected to the fiber under test. In practical applications, when the OTDR emits detection light pulses, WDM can perform wavelength division multiplexing processing on the optical signal sent by the optical amplifier and the optical signal sent by the 3-port circulator or coupler D, and then output to the optical fiber under test. In other words, WDM is a multiplexer of OTDR detection light and service light.

One of the key indicators of OTDR is dynamic range, which refers to the maximum optical fiber attenuation that can be accurately measured. The unit is dB. OTDR measurement data can be represented by a power curve.

2A and 2B are schematic diagrams of OTDR measurement data represented by power curves in the related art.

In FIG. 2A, the horizontal axis represents distance and the vertical axis represents power. From FIG. 2A, it can be determined that the distance interval corresponding to the dynamic range (Dynamic Range) is determined. Within the distance interval corresponding to the dynamic range, the power curve is above the dotted line in FIG. 2A, and within the distance interval corresponding to the dynamic range, the power curve is below the dotted line in FIG. 2A.

In Figure 2B, the horizontal axis represents distance, and the vertical axis represents power. As shown in Figure 2B, when the measured fiber is longer and exceeds the distance interval corresponding to the dynamic range of the OTDR, the OTDR cannot detect the distance outside the corresponding dynamic range. Optical fiber, the total length of the optical fiber cannot be measured.

In response to this problem, a dual-ended OTDR solution has been proposed in related technologies, that is, OTDR devices are installed at both ends of the optical fiber to increase the effective detection distance of the OTDR to the optical fiber.

Figure 3 is a schematic diagram of measuring optical fiber parameters using a double-ended OTDR solution in the related art.

As shown in Fig. 3, site 1 and site 2 respectively represent the two ends of the optical fiber. The internal structure of site 1 is similar to the structure shown in Fig. 1, and will not be repeated here. In station 2, the first port of WDM is used to connect to the optical fiber under test, and the second port (output port) of WDM is used to connect to an optical amplifier. In OTDR2, the probe optical pulse sent by OTDR2 is sent to the 3-port ring Port 1 of the three-port circulator or coupler D is used to receive the return signal, and port 2 of the three-port circulator or coupler D is used to connect to the third port of the WDM multiplexer.

Although the double-ended OTDR solution can increase the effective detection distance of the OTDR on the optical fiber, there are still the following problems: the total length of the optical fiber cannot be obtained, and thus the total delay information of the optical fiber cannot be obtained; the measurement curve of the optical fiber attenuation cannot be presented uniformly.

Fig. 4 shows a schematic diagram of the measurement curves of fiber attenuation respectively presented by the double-ended OTDR scheme in the related technology. As shown in Figure 4, the horizontal axis represents distance and the vertical axis represents power.

Based on the content described above, the following embodiments are proposed.

The embodiment of the present disclosure provides an optical fiber monitoring method. At least one OTDR is provided on the above-mentioned optical fiber, and a light reflecting device is provided on the opposite end of the end where the at least one OTDR is located.

In practical applications, the above-mentioned light reflection device may be an optical device with a certain reflectivity for the OTDR detection light wavelength, and the light reflection device may be a separate optical device, for example, a fiber grating, a coated lens, an etalon etalon and other devices.

Here, the OTDR can be set at one end of the optical fiber, or the first OTDR and the second OTDR can be set at both ends of the optical fiber respectively. The two cases are explained separately below.

Fig. 5 is a schematic diagram of measuring optical fiber parameters using a single-ended OTDR according to an embodiment of the present disclosure.

As shown in Fig. 5, the internal structure of site 1 is similar to the structure shown in Fig. 1, and will not be repeated here. In station 2, a light reflecting device is installed between the end of the fiber under test and the input end of the optical amplifier.

Fig. 6 is a schematic diagram of measuring optical fiber parameters using a double-ended OTDR solution according to an embodiment of the present disclosure.

The structure shown in FIG. 6 is basically the same as the structure shown in FIG. 4, and the difference lies in that: the station 1 and the station 2 are respectively provided with light reflecting devices. Optionally, arranging the optical reflection device on the OTDR optical port of the WDM can reduce the additional loss of service light. In practical applications, the light reflecting device and WDM can also be arranged on a unified board.

FIG. 7 is a flowchart of an optical fiber monitoring method according to an embodiment of the present disclosure. As shown in FIG. 7, the process may include steps 701 to 702.

In step 701, after using the first OTDR and the second OTDR to respectively emit the detection light signal, the measurement data of the first OTDR and the measurement data of the second OTDR are obtained respectively.

In actual implementation, after each OTDR transmits the detection light signal, the detection light signal is transmitted through the optical fiber. After the reflection and scattering of the optical fiber and the reflection of the light reflection device, the OTDR can receive the return signal, and then the corresponding signal can be obtained according to the return signal. Measurement data. The controller can obtain the corresponding measurement data from the OTDR. Here, the controller can be an Application Specific Integrated Circuit (ASIC), a digital signal processor (Digital Signal Processor, DSP), a digital signal processing device (Digital Signal Processing, etc.). Device, DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), Central Processing Unit (CPU), Controller, Microcontroller, Micro At least one of the processors.

For single-ended OTDR, OTDR measurement data can be represented by the power curve shown in Figure 8. In Figure 8, the horizontal axis represents the distance, the vertical axis represents the power, and L represents the total length of the optical fiber. For a double-ended OTDR, the measurement data of the OTDR can be represented by the power curve shown in Figure 9. In Figure 9, the horizontal axis represents the distance and the vertical axis represents the power.

The following is a theoretical calculation of the detection capability of the OTDR and the reflectivity of the light reflection device.

After the OTDR transmits the detection light signal to the optical fiber, it detects the Rayleigh scattered light and Fresnel reflected light to determine the optical fiber attenuation and incident point information. The back Rayleigh scattering coefficient of ordinary optical fiber is expressed as RdB. For an OTDR with a dynamic range of D (dB), the minimum power that can be detected is:

P _min =P ₀ -R-2D,

Among them, P _min is the lowest optical power that the OTDR can detect, and P ₀ is the power of the detection light emitted by the OTDR.

If the dynamic range of the combined detection in the dual-ended OTDR solution is 1+k times that of a single OTDR, and the OTDR is required to detect the reflected light power of the end point, the end point reflection coefficient α _r (dB), α _r ≥ 0 , Should satisfy the following relationship:

P ₀ -2(1+k)D-α _r ≥P _min +δ Equation 1

α _r ≤R-2kD-δ Equation 2

Because α _r ≥0, then k≤(R-δ)/2D Equation 3

Among them, the δ (dB) in formula 1 is the available margin for the OTDR to distinguish the end point event points. This margin is related to the OTDR performance, and the available margins of different OTDRs are slightly different; formula 2 gives the reflection of the two-way OTDR scheme The reflectivity requirements of the device; Equation 3 gives the upper limit of the detection distance supported by the bidirectional OTDR solution (the upper limit of the distance corresponding to the dynamic range).

In step 702, the measurement data of the first OTDR and the measurement data of the second OTDR are combined to obtain unified optical fiber measurement data.

In the embodiments of the present disclosure, for a single-ended OTDR, since the measurement data of the OTDR is obtained based on the reflected signal of the light reflecting device, and the light reflecting device is arranged on the end of the optical fiber opposite to the OTDR, the controller can directly follow the OTDR Measured data to get the length of the optical fiber.

In the double-ended OTDR solution, the above-mentioned at least one OTDR includes a first OTDR and a second OTDR respectively provided at both ends of the optical fiber. In the embodiment of the present disclosure, the first OTDR may be recorded as OTDR1, and the second OTDR may be recorded as OTDR2. Exemplarily, the controller can obtain the length of the optical fiber in the following ways.

Way 1

According to the measurement data of any one of the first OTDR and the second OTDR, the length of the optical fiber is obtained. Here, any one of the foregoing OTDRs may be an OTDR agreed upon in the first OTDR and the second OTDR.

Way 2

According to the measurement data of the OTDR with the larger dynamic range among the first OTDR and the second OTDR, the length of the optical fiber is obtained.

Way 3

According to the measurement data of the first OTDR, obtain the first length value of the optical fiber; obtain the second length value of the optical fiber according to the measurement data of the second OTDR; take the average value of the first length value and the second length value of the optical fiber as The length of the fiber.

It is understandable that because the light reflecting device is a newly-added device for reflecting light signals, it can increase the ability to reflect the detection light signal. Furthermore, by adding a light reflecting device at the end of the optical fiber, it is easy to know the optical fiber Total length information.

As an implementation of this step, the measurement data of the first OTDR or the second OTDR can be processed so that the measurement data of the first OTDR and the measurement data of the second OTDR correspond to the same distance interval; in the same distance interval Determine the data demarcation point; according to the data demarcation point, respectively intercept part of the measurement data of the first OTDR and the second OTDR measurement data; synthesize the intercepted data to obtain unified optical fiber measurement data.

In practical applications, the measurement data of each OTDR can be represented by a power curve graph. The horizontal axis of the power graph represents distance and the vertical axis represents power. On this basis, for the implementation of processing the measurement data of the first OTDR or the second OTDR so that the measurement data of the first OTDR and the measurement data of the second OTDR correspond to the same distance interval, for example, The power curve of the first OTDR and the power curve of the second OTDR are placed in the same coordinate system. Specifically, the power curve of the second OTDR can be mirrored with the vertical axis as the symmetry axis, so that the power curve of the first OTDR and the second OTDR The power curves of the two OTDRs all correspond to the same distance interval.

FIG. 10 is a schematic diagram of the power curve of OTDR1 and the power curve of OTDR2 displayed in the same coordinate system according to an embodiment of the present disclosure.

In Fig. 10, the horizontal axis represents distance, and the vertical axis represents power. The power curve of OTDR2 in Fig. 10 is based on the initial power curve of OTDR2, and the vertical axis is taken as the axis of symmetry and mirrored. Figure 10 can show a complete test curve of the optical fiber, where the length of the optical fiber can be denoted as L. The disadvantage of using Figure 10 to present the complete test curve of the optical fiber is that it is different from the traditional single OTDR test curve.

In practical applications, it can also be determined whether the optical fiber has an incident point according to the measurement data of the first OTDR and the measurement data of the second OTDR. In the embodiment of the present disclosure, the event point represents the discontinuous point in the optical fiber detected by the OTDR, such as the bend of the optical fiber (point with excessive loss caused by bending), connector, break point, and fusion splice point. Event point information is generally listed on the user interface in tabular form, including the location, loss, reflectivity and other information of the event point.

In the embodiments of the present disclosure, after the data demarcation points are determined in the same distance interval, data interception and data splicing need to be performed according to the data demarcation points, so as to realize the synthesis of the intercepted data, which will be described in detail below.

For the implementation of determining the data demarcation point in the same distance interval, in the first example, when determining the non-event point of the optical fiber according to the measurement data of the first OTDR and the measurement data of the second OTDR, according to the first The ratio of the dynamic range of the OTDR to the dynamic range of the second OTDR determines the data demarcation point in the same distance interval.

In the embodiments of the present disclosure, FIG. 10 shows a complete test curve when the fiber has no event point. Referring to FIG. 10, the horizontal distance between the data demarcation point and the vertical axis of the OTDR1 power curve is L*D1/(D1+D2), where , D1 represents the dynamic range of OTDR1, D2 represents the dynamic range of OTDR2, the horizontal distance between the data dividing point and the vertical axis of the power curve of OTDR1 is L*D2/(D1+D2).

For the complete test curve shown in Figure 10, based on the data demarcation point, the power curve of OTDR1 is cut when it is close to the vertical axis of the power curve of OTDR1, and the power curve of OTDR2 is cut when it is close to the vertical axis of the power curve of OTDR2. After data interception (curve interception) is performed, the intercepted curves are spliced, and a schematic diagram of the power curve shown in FIG. 11 after splicing can be obtained.

For the spliced schematic diagram of the power curve shown in Figure 11, if the optical fiber data is presented at the main measurement point of OTDR1, the intercepted power curve of OTDR2 needs to be processed. Specifically, referring to Figure 11, for the intercepted OTDR2 For each data point of the power curve, the following calculations can be made:

A'=A-2a

Among them, A represents the power value of any data point of the power curve of OTDR2, a is the power attenuation of the optical cable between the data point corresponding to the power value A and the data boundary point, and the power value of the data boundary point can be recorded as A ₀ . After calculating A', the data point corresponding to A'can be determined in Figure 11. Furthermore, by performing the above calculation for each data point of the intercepted OTDR2 power curve, the schematic diagram 1 of the unified optical fiber test curve shown in the double-ended OTDR solution shown in Figure 12 can be obtained. It can be seen that The optical fiber test curve shown is similar to that of a single-ended OTDR.

It can be seen that after the controller determines the data demarcation point for the same distance interval, it can perform data interception and data splicing according to the data demarcation point, and then realize the synthesis of the intercepted data, and then control the user interface display and single-ended The optical fiber test curve of OTDR is similar to the test curve.

That is to say, in a system configured with a double-ended OTDR, the controller can use the fiber length information to merge the measurement data of the OTDR at both ends of the fiber, and then uniformly present the fiber attenuation curve on the user interface. In addition, the embodiments of the present disclosure can accurately detect the length of the optical fiber, the total attenuation of the optical cable, and the location information of the event point.

Regarding the implementation of determining the data demarcation point in the same distance interval, in the second example, when it is determined that the optical fiber has an event point based on the measurement data of the first OTDR and the measurement data of the second OTDR, and the event point is located in the first When the distance interval corresponding to the dynamic range of one OTDR and the distance interval corresponding to the dynamic range of the second OTDR, the event point is used as the data dividing point.

After taking the event point as the data demarcation point, the methods of data interception, data splicing, and data synthesis are the same as the data processing methods shown in FIGS. 10 to 12, and will not be repeated here.

Regarding the implementation of determining the data demarcation point in the same distance interval, in the third example, when it is determined that the optical fiber has an event point based on the measurement data of the first OTDR and the measurement data of the second OTDR, and the event point is not in In the case of a distance interval corresponding to the dynamic range of any OTDR, the critical point of the distance interval corresponding to the dynamic range of any one of the OTDRs is used as the data demarcation point.

FIG. 13 is a schematic diagram of the power curve of OTDR1 and the power curve of OTDR2 displayed in the same coordinate system when an event point exists in the optical fiber according to an embodiment of the present disclosure. As shown in Fig. 13, the horizontal axis represents distance and the vertical axis represents power. Regarding the power curve of OTDR1 and the power curve of OTDR2 shown in Fig. 13, data processing can be performed in accordance with the data processing methods shown in Fig. 10 to Fig. 12 to obtain the unified fiber shown in Fig. 14 for the double-ended OTDR solution Diagram 2 of the test curve.

In order to better reflect the purpose of the present disclosure, further examples are given on the basis of the above-mentioned embodiments.

In this embodiment, the first implementation manner of obtaining measurement data of two OTDRs is exemplarily explained.

Here, the optical fiber is also provided with a switching device, and the switching device connects an OTDR and a light reflecting device to the two ends of the optical fiber respectively. In practical applications, the switching device can be implemented by at least one optical switch.

In specific implementation, the controller can control the switching device to connect the two ends of the optical fiber to the first OTDR and the corresponding light reflecting device respectively, and obtain the measurement of the first OTDR after using the first OTDR to transmit the detection light signal Data; the controller can control the switching device to make the two ends of the optical fiber respectively connect the second OTDR and the corresponding light reflecting device, and after using the second OTDR to transmit the detection light signal, obtain the measurement of the second OTDR data.

In the following, an implementation manner of acquiring measurement data of two OTDRs in an embodiment of the present disclosure will be described with reference to FIG. 15.

Fig. 15 is a schematic structural diagram of obtaining measurement data of two OTDRs according to an embodiment of the present disclosure.

Figure 15 adds two new optical switches on the basis of Figure 6, namely optical switch 1 and optical switch 2. Among them, the fixed end of optical switch 1 is connected to a port of WDM at site 1, and the active end of optical switch 1 is selective Connect the light reflection device of site 1 and port 2 of the circulator or coupler D in OTDR1. The fixed end of the optical switch 2 is connected to a port of the WDM of the site 2, and the movable end of the optical switch 2 is selectively connected to the optical reflection device of the site 2 and the port 2 of the circulator or coupler D in the OTDR2.

For the structure shown in FIG. 15, the workflow of the embodiment of the present disclosure includes: when it is determined to use OTDR1 to measure the length of the optical fiber, the controller switches the optical switch 2 to the port of the optical reflection device, switches the optical switch 1 to the OTDR port, and OTDR1 Start the measurement and wait for the completion of the OTDR1 measurement, the controller switches the optical switch 1 to the port of the light reflection device, switches the optical switch 2 to the OTDR port, and OTDR2 starts the measurement. The two OTDR measurement data are reported to the controller, and the controller obtains fiber length information based on the received measurement data, and after re-integrating the attenuation data and event information of the entire section of fiber, it controls the user interface for display.

In this embodiment, the second implementation manner of obtaining measurement data of two OTDRs is exemplarily explained.

Here, the optical fiber is also provided with a coupling device for optically coupling the OTDR and the light reflecting device at the same end of the optical fiber. In practical applications, the coupling device can be realized by at least one optical coupler.

In a specific implementation, the controller may control the working state of the coupling device so that the first OTDR and the second OTDR can receive respective measurement data after sending the detection light signal in sequence.

Hereinafter, an implementation manner of acquiring measurement data of two OTDRs in an embodiment of the present disclosure will be described with reference to FIG. 16.

FIG. 16 is a schematic diagram of another structure for acquiring measurement data of two OTDRs according to an embodiment of the present disclosure.

Figure 16 adds two new optical couplers on the basis of Figure 6, namely optical coupler 1 and optical coupler 2. Among them, optical coupler 1 is connected to the WDM, light reflecting device and circulator or coupler of site 1 Between the port 2 of D, the optical coupler 2 is connected between the WDM, the light reflecting device and the port 2 of the circulator or coupler D of the site 2.

For the structure shown in FIG. 16, the workflow of the embodiment of the present disclosure includes: the controller controls OTDR1 and OTDR2 to measure optical fiber parameters successively, and obtains measurement data of OTDR1 and OTDR2; the controller obtains optical fiber length information according to the received measurement data , And re-integrate the attenuation data and event information of the entire fiber, and then control the user interface to display it.

In this embodiment, the third implementation manner of obtaining measurement data of two OTDRs is exemplarily explained.

In this embodiment, the structure for obtaining measurement data of two OTDRs is the structure shown in FIG. 6. Specifically, the light reflecting device includes: a first light reflecting device arranged between the second OTDR and the optical fiber, and a second light reflecting device arranged between the first OTDR and the optical fiber. The first light reflecting device is used to reflect the detection light signal of the first OTDR and transmit the detection light signal of the second OTDR. The second light reflecting device is used to reflect the detection light signal of the second OTDR and transmit the detection light signal of the first OTDR.

It can be seen that in this embodiment, the controller can control OTDR1 and OTDR2 to measure fiber parameters simultaneously or sequentially, and obtain the measurement data of OTDR1 and OTDR2; the controller obtains fiber length information based on the received measurement data, and reintegrates After the attenuation data and event information of the entire fiber, control the user interface to display.

On the basis of the optical fiber monitoring method proposed in the foregoing embodiments of the present disclosure, this embodiment proposes an optical fiber monitoring device.

The above-mentioned optical fiber inspection equipment includes a controller, a first OTDR and a second OTDR respectively provided at both ends of the optical fiber, and a light reflecting device provided at the opposite end of each OTDR.

The controller is used to obtain the measurement data of the first OTDR and the measurement data of the second OTDR after the first OTDR and the second OTDR respectively emit the detection light signal; The measurement data of the second OTDR is synthesized and processed to obtain unified optical fiber measurement data.

In one embodiment, the controller is configured to process the measurement data of the first OTDR or the second OTDR so that the measurement data of the first OTDR and the measurement data of the second OTDR correspond to the same distance Interval; determine the data demarcation point in the same distance interval; according to the data demarcation point, respectively intercept part of the measurement data of the first OTDR and the second OTDR measurement data; synthesize the intercepted data, Obtain unified fiber measurement data.

In an embodiment, the controller is configured to determine the non-event point of the optical fiber according to the measurement data of the first OTDR and the measurement data of the second OTDR, according to the dynamic range of the first OTDR and the The ratio of the dynamic range of the second OTDR determines the data demarcation point in the same distance interval, wherein the event point represents a discontinuous point in the optical fiber.

In an embodiment, the controller is configured to determine that there is an event point on the optical fiber according to the measurement data of the first OTDR and the measurement data of the second OTDR, and the event point is located in the first OTDR. When the distance interval corresponding to the dynamic range and the distance interval corresponding to the dynamic range of the second OTDR, the event point is used as the data demarcation point, where the event point represents a discontinuous point in the optical fiber.

In one embodiment, the controller is configured to determine that the optical fiber has an event point according to the measurement data of the first OTDR and the measurement data of the second OTDR, and the event point is not in any dynamic state of an OTDR When the range corresponds to the distance interval, the critical point of the distance interval corresponding to the dynamic range of any one of the OTDRs is used as the data demarcation point, where the event point represents a discontinuous point in the optical fiber.

In one embodiment, the device further includes a switching device arranged on the optical fiber, and the switching device connects an OTDR and a light reflecting device to both ends of the optical fiber, respectively.

Correspondingly, the controller is used to control the switching device to make the two ends of the optical fiber connect to the first OTDR and the corresponding light reflecting device respectively, and after using the first OTDR to transmit the detection light signal, obtain the first OTDR measurement data; controlling the switching device to make the two ends of the optical fiber connect to the second OTDR and the corresponding light reflecting device respectively, and after using the second OTDR to transmit the detection light signal, the measurement of the second OTDR is obtained data.

In one embodiment, the device further includes a coupling device for optically coupling the OTDR and the light reflecting device at the same end of the optical fiber.

Correspondingly, the controller is used to obtain the respective measurement data of the first OTDR and the second OTDR after the first OTDR and the second OTDR sequentially send the detection light signal by controlling the working state of the coupling device .

In one embodiment, the light reflecting device includes: a first light reflecting device arranged between the second OTDR and the optical fiber, and a second light reflecting device arranged between the first OTDR and the optical fiber Light reflection device. The first light reflecting device is used to reflect the detection light signal of the first OTDR and transmit the detection light signal of the second OTDR. The second light reflection device is used to reflect the detection light signal of the second OTDR and transmit the detection light signal of the first OTDR.

In an embodiment, the optical fiber is provided with a first multiplexer for processing the service signal and the detection light signal emitted by the first OTDR, and a detection light signal for the service signal and the detection light signal emitted by the second OTDR The second multiplexer for processing. Correspondingly, the light reflecting device includes a first light reflecting device and a second light reflecting device, the first light reflecting device is arranged at the OTDR port of the second multiplexer, and the second light reflecting device is arranged at The OTDR port of the first multiplexer.

The optical fiber monitoring equipment of the embodiments of the present disclosure will be further described below with reference to the accompanying drawings.

As shown in Figure 17, the controller 1701 communicates with OTDR1 1702, OTDR2 1703, and other auxiliary equipment 1704 respectively. The other auxiliary equipment may be the above-mentioned switching devices, coupling devices, etc., and other auxiliary devices are optional configuration devices. . The controller 1701 can also control the display 1705 to display information such as a user interface.

Referring to FIG. 17, the workflow of the optical fiber monitoring device of the embodiment of the present disclosure is: the controller manages and coordinates the operation of the underlying device, and at the same time receives the issued query instruction, can report the measurement data to the user terminal, and can control the user interface to display the measurement data; The controller establishes communication with the OTDR and other auxiliary devices through the monitoring communication interface of the device; in specific display, the controller can control the display to display the user interface, and present the OTDR measurement results in the form of tables and graphs on the user interface.

By adopting the technical solution of the embodiment of the present disclosure, by arranging light reflecting devices at both ends of the optical fiber, the total length information of the optical fiber can be obtained based on the obtained measurement data. Furthermore, after the OTDR measurement data at both ends of the optical fiber are combined, it is beneficial to Unify and accurately present fiber measurement data.

The above are only the embodiments of the present disclosure and are not used to limit the protection scope of the present disclosure.

Claims

An optical fiber monitoring method, wherein a first optical time domain reflectometer OTDR and a second OTDR are respectively provided at both ends of the optical fiber, and an optical reflection device is provided at the opposite end of each OTDR on the optical fiber, the method includes:

After the first OTDR and the second OTDR are used to respectively transmit the detection light signal, the measurement data of the first OTDR and the measurement data of the second OTDR are obtained respectively; and

The measurement data of the first OTDR and the measurement data of the second OTDR are combined to obtain unified optical fiber measurement data.
The method according to claim 1, wherein the step of synthesizing the measurement data of the first OTDR and the measurement data of the second OTDR to obtain unified optical fiber measurement data comprises:

By processing the measurement data of the first OTDR or the second OTDR, so that the measurement data of the first OTDR and the measurement data of the second OTDR correspond to the same distance interval;

Determine the data demarcation point in the same distance interval;

According to the data demarcation point, respectively intercept part of the measurement data of the first OTDR and the measurement data of the second OTDR; and

Synthesize the intercepted data to obtain unified optical fiber measurement data.
The method according to claim 2, wherein the step of determining the data demarcation point in the same distance interval comprises:

When determining the non-event point of the optical fiber according to the measurement data of the first OTDR and the measurement data of the second OTDR, according to the ratio of the dynamic range of the first OTDR to the dynamic range of the second OTDR, Said the same distance interval to determine the data cutoff point,

Wherein, the event point represents a discontinuous point in the optical fiber.
The method according to claim 2, wherein the step of determining the data demarcation point in the same distance interval comprises:

When it is determined that the optical fiber has an event point according to the measurement data of the first OTDR and the measurement data of the second OTDR, and the event point is located in the distance interval corresponding to the dynamic range of the first OTDR and the second OTDR In the distance interval corresponding to the dynamic range, use the event point as the data demarcation point,

Wherein, the event point represents a discontinuous point in the optical fiber.
The method according to claim 2, wherein the step of determining the data demarcation point in the same distance interval comprises:

When it is determined that the optical fiber has an event point according to the measurement data of the first OTDR and the measurement data of the second OTDR, and the event point is not in the distance interval corresponding to the dynamic range of any OTDR, the any The critical point of the distance interval corresponding to the dynamic range of an OTDR is used as the data demarcation point,

Wherein, the event point represents a discontinuous point in the optical fiber.
The method according to any one of claims 1 to 5, wherein a switching device is further provided on the optical fiber, and the switching device connects two ends of the optical fiber to an OTDR and a light reflecting device respectively, and

After the first OTDR and the second OTDR are used to respectively emit the detection light signal, the step of separately acquiring the measurement data of the first OTDR and the measurement data of the second OTDR includes:

Controlling the switching device to make the two ends of the optical fiber connect to the first OTDR and the corresponding light reflecting device respectively, and obtaining the measurement data of the first OTDR after using the first OTDR to transmit the detection light signal; and

The switching device is controlled so that the two ends of the optical fiber are respectively connected to the second OTDR and the corresponding light reflecting device, and the measurement data of the second OTDR is acquired after the detection light signal is transmitted by the second OTDR.
The method according to any one of claims 1 to 5, wherein the optical fiber is further provided with a coupling device for optically coupling the OTDR and the light reflecting device at the same end of the optical fiber, and

After the first OTDR and the second OTDR are used to respectively emit the detection light signal, the step of separately acquiring the measurement data of the first OTDR and the measurement data of the second OTDR includes:

By controlling the working state of the coupling device, the first OTDR and the second OTDR are made to sequentially send the detection light signal, and then the respective measurement data of the first OTDR and the second OTDR are acquired.
The method according to any one of claims 1 to 5, wherein the light reflecting device comprises: a first light reflecting device arranged between the second OTDR and the optical fiber, and a first light reflecting device arranged on the first The second light reflection device between the OTDR and the optical fiber,

Wherein, the first light reflecting device is used to reflect the detection light signal of the first OTDR and transmit the detection light signal of the second OTDR, and

The second light reflection device is used to reflect the detection light signal of the second OTDR and transmit the detection light signal of the first OTDR.
An optical fiber monitoring equipment includes: a controller, a first optical time domain reflectometer OTDR and a second OTDR respectively arranged at both ends of the optical fiber, and a light reflecting device arranged at the opposite end of each OTDR, wherein,

The controller is used for:

After the first OTDR and the second OTDR respectively emit the detection light signal, the measurement data of the first OTDR and the measurement data of the second OTDR are obtained respectively; and

The measurement data of the first OTDR and the measurement data of the second OTDR are combined to obtain unified optical fiber measurement data.
The device according to claim 9, wherein the controller is configured to:

By processing the measurement data of the first OTDR or the second OTDR, so that the measurement data of the first OTDR and the measurement data of the second OTDR correspond to the same distance interval;

Determine the data demarcation point in the same distance interval;

According to the data demarcation point, respectively intercept part of the measurement data of the first OTDR and the measurement data of the second OTDR; and

Synthesize the intercepted data to obtain unified optical fiber measurement data.
The device according to claim 10, wherein the controller is configured to:

When determining the non-event point of the optical fiber according to the measurement data of the first OTDR and the measurement data of the second OTDR, according to the ratio of the dynamic range of the first OTDR to the dynamic range of the second OTDR, Said the same distance interval to determine the data cutoff point,

Wherein, the event point represents a discontinuous point in the optical fiber.
The device according to claim 10, wherein the controller is configured to:

When it is determined that the optical fiber has an event point according to the measurement data of the first OTDR and the measurement data of the second OTDR, and the event point is located in the distance interval corresponding to the dynamic range of the first OTDR and the second OTDR In the distance interval corresponding to the dynamic range, use the event point as the data demarcation point,

Wherein, the event point represents a discontinuous point in the optical fiber.
The device according to claim 10, wherein the controller is configured to:

When it is determined that the optical fiber has an event point according to the measurement data of the first OTDR and the measurement data of the second OTDR, and the event point is not in the distance interval corresponding to the dynamic range of any OTDR, the any The critical point of the distance interval corresponding to the dynamic range of an OTDR is used as the data demarcation point,

Wherein, the event point represents a discontinuous point in the optical fiber.
The device according to any one of claims 9 to 13, wherein the device further comprises a switching device provided on the optical fiber, and the switching device enables the two ends of the optical fiber to be connected to an OTDR and an optical fiber respectively. Reflector, and

The controller is used for:

Controlling the switching device to make the two ends of the optical fiber connect to the first OTDR and the corresponding light reflecting device respectively, and obtaining the measurement data of the first OTDR after using the first OTDR to transmit the detection light signal; and

The switching device is controlled so that the two ends of the optical fiber are respectively connected to the second OTDR and the corresponding light reflecting device, and after the detection light signal is transmitted by the second OTDR, the measurement data of the second OTDR is obtained.
The device according to any one of claims 9 to 13, wherein the device further comprises a coupling device for optically coupling the OTDR and the light reflection device at the same end of the optical fiber, and

The controller is used for:

By controlling the working state of the coupling device, the first OTDR and the second OTDR are made to sequentially send the detection light signal, and then the respective measurement data of the first OTDR and the second OTDR are acquired.
The apparatus according to any one of claims 9 to 13, wherein the light reflecting device comprises: a first light reflecting device arranged between the second OTDR and the optical fiber, and a first light reflecting device arranged on the first The second light reflection device between the OTDR and the optical fiber,

Wherein, the first light reflecting device is used to reflect the detection light signal of the first OTDR and transmit the detection light signal of the second OTDR, and

The second light reflection device is used to reflect the detection light signal of the second OTDR and transmit the detection light signal of the first OTDR.
The device according to any one of claims 9 to 13, wherein the optical fiber is provided with a first multiplexer for processing service signals and probe light signals emitted by the first OTDR, and a first combiner for processing service signals and A second multiplexer for processing the detection light signal emitted by the second OTDR, and the light reflection device includes a first light reflection device and a second light reflection device,

Wherein, the first light reflecting device is arranged at the OTDR port of the second multiplexer, and

The second light reflection device is arranged at the OTDR port of the first multiplexer.