CN118274896A - Optical fiber vibration and attenuation double-parameter simultaneous measurement device and method - Google Patents

Abstract

The embodiment of the disclosure relates to the field of optical fiber measurement, and provides a device and a method for simultaneously measuring optical fiber vibration and attenuation double parameters, wherein the device comprises: the light source module is used for providing composite light suitable for detecting optical fiber vibration and optical fiber attenuation at the same time and intrinsic light suitable for optical fiber vibration detection; the light source processing module is used for converting the composite light into pulse light under the control of the control and acquisition processing module, amplifying the pulse light, injecting the amplified pulse light into the optical fiber to be detected, and receiving the composite Rayleigh scattered light which is returned by the optical fiber to be detected and carries the optical fiber vibration signal and the optical fiber attenuation signal; the light receiving module is used for converting the intrinsic light and the composite Rayleigh scattered light into corresponding electric signals; the control and acquisition processing module is used for controlling the light source processing module to convert the composite light into pulse light and processing data on the electric signals to obtain optical vibration information and optical attenuation information under the same coordinate system, thereby providing effective guidance for the operation and safety maintenance of the optical cable.

Description

Optical fiber vibration and attenuation double-parameter simultaneous measurement device and method

Technical Field

The disclosure relates to the technical field of optical fiber measurement, in particular to a device and a method for simultaneously measuring optical fiber vibration and attenuation double parameters.

Background

Communication fiber optic cables have become an important component of the digital infrastructure. In addition to communication applications, the fiber optic cable may also serve as a sensing medium for sensing physical quantities of the fiber optic cable or even the surrounding environment. This includes, among other things, fiber attenuation measurements and fiber vibration measurements. Fiber attenuation measurement is an important technical means for measuring the health of optical cables. Fiber vibration measurement is the primary way to sense the environmental vibrations within the periphery of the fiber.

In the prior art, a special optical fiber attenuation measuring device is generally adopted to finish optical fiber attenuation measurement, and a special optical fiber vibration measuring device is adopted to finish optical fiber vibration measurement. However, when the optical fiber attenuation measurement and the optical fiber vibration measurement need to be completed simultaneously, the optical fiber attenuation measurement device and the optical fiber vibration measurement device can only be mechanically combined together for simultaneous use in the prior art, so that the total volume of the measurement device is increased, and the optical fiber attenuation measurement result and the optical fiber vibration measurement result are mutually independent and respectively correspond to different coordinate systems.

Disclosure of Invention

The present disclosure aims to solve at least one of the problems in the prior art, and provides a device and a method for simultaneously measuring two parameters of vibration and attenuation of an optical fiber.

In one aspect of the disclosure, a fiber vibration and attenuation dual-parameter simultaneous measurement device is provided, and the measurement device comprises a light source module, a light source processing module, a light receiving module and a control and acquisition processing module; the light source module is respectively connected with the light source processing module and the light receiving module through optical fibers, the light source processing module is respectively connected with the light receiving module and the optical fibers to be tested through optical fibers, and the light source processing module and the light receiving module are respectively electrically connected with the control and acquisition processing module;

The light source module is used for providing composite light suitable for detecting optical fiber vibration and optical fiber attenuation simultaneously and intrinsic light suitable for optical fiber vibration detection;

The light source processing module is used for converting the composite light into pulse light under the control of the control and acquisition processing module, amplifying the pulse light and injecting the amplified pulse light into the optical fiber to be tested; and receiving composite Rayleigh scattered light which is returned by the optical fiber to be tested and carries an optical fiber vibration signal and an optical fiber attenuation signal;

The light receiving module is used for converting the intrinsic light and the composite Rayleigh scattered light into corresponding electric signals;

the control and acquisition processing module is used for controlling the light source processing module to convert the composite light into the pulse light; and performing data processing on the electric signals to obtain optical vibration information and optical attenuation information under the same coordinate system.

Optionally, the light source module includes a first laser light source, a second laser light source, a first DWDM, a beam splitter, and a tunable attenuator;

The first laser light source is optically connected with the beam splitter; the reflection port of the first DWDM is optically connected with the second laser light source, the transmission port of the first DWDM is optically connected with the beam splitter, and the incidence port of the first DWDM is connected with the light source processing module through an optical fiber; the optical splitter is also optically connected with the adjustable attenuator; the adjustable attenuator is connected with the light receiving module through an optical fiber.

Optionally, the light source processing module comprises a pulse modulator, an EDFA, a circulator, a WDM, a second DWDM;

The pulse modulator is connected with an incident port of the first DWDM through an optical fiber, is also connected with the EDFA, and is connected with the control and acquisition processing module through a driving wire; the EDFA is optically connected with the circulator; said circulator being optically connected to said WDM; the incident port of the second DWDM is optically connected with the circulator, and the reflection port of the second DWDM and the transmission port of the second DWDM are respectively connected with the optical receiving module through optical fibers; the WDM is also connected with the optical fiber to be tested.

Optionally, the light receiving module includes a balanced photodetector and a photodetector;

The balance optical detector is respectively and optically connected with the adjustable attenuator and the transmission port of the second DWDM, and is also electrically connected with the control and acquisition processing module; the photoelectric detector is optically connected with the reflection port of the second DWDM, and is also electrically connected with the control and acquisition processing module.

Optionally, the control and acquisition processing module comprises a signal source, an acquisition card and a data processing unit;

The signal source is connected with the pulse modulator through the driving wire and is also electrically connected with the acquisition card; the acquisition card is also respectively and optically connected with the photoelectric detector and the balance light detector; the data processing unit is electrically connected with the acquisition card.

Optionally, the light source processing module further includes a raman laser optically connected to the WDM.

Optionally, the wavelength of the first laser light source and the wavelength of the second laser light source are in adjacent channels.

Optionally, the linewidth of the first laser light source is smaller than the linewidth of the second laser light source.

Optionally, the linewidth of the first laser source is smaller than 100kHz, and the linewidth of the second laser source is larger than 100kHz.

In another aspect of the present disclosure, there is provided a method for simultaneously measuring two parameters of vibration and attenuation of an optical fiber, the method comprising:

Providing composite light suitable for detecting fiber vibration and fiber attenuation simultaneously and intrinsic light suitable for fiber vibration detection;

converting the composite light into pulse light, amplifying the pulse light, and injecting the amplified pulse light into an optical fiber to be tested;

Receiving composite Rayleigh scattered light which is returned by the optical fiber to be tested and carries an optical fiber vibration signal and an optical fiber attenuation signal;

converting the intrinsic light and the composite rayleigh scattered light into corresponding electrical signals;

And carrying out data processing on the electric signals to obtain optical vibration information and optical attenuation information under the same coordinate system.

Compared with the prior art, the optical fiber vibration and attenuation dual-parameter simultaneous measurement method and device can not only utilize the composite light suitable for simultaneously detecting the optical fiber vibration and the optical fiber attenuation to realize the optical fiber vibration and attenuation dual-parameter simultaneous measurement, but also enable the optical attenuation information and the optical vibration information obtained through measurement to be in the same coordinate system, thereby providing effective guidance for the operation maintenance of the optical cable and the safety maintenance of the optical cable.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures do not depict a proportional limitation unless expressly stated otherwise.

FIG. 1 is a schematic diagram of a device for simultaneous measurement of two parameters of vibration and attenuation of an optical fiber according to an embodiment of the present disclosure;

fig. 2 is a schematic structural view of a light source module according to another embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a light source processing module according to another embodiment of the present disclosure;

Fig. 4 is a schematic structural view of a light receiving module according to another embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a control and acquisition processing module according to another embodiment of the present disclosure;

Fig. 6 is a flowchart of a method for simultaneously measuring two parameters of vibration and attenuation of an optical fiber according to another embodiment of the present disclosure.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present disclosure, numerous technical details have been set forth in order to provide a better understanding of the present disclosure. The technical solutions claimed in the present disclosure can be implemented without these technical details and with various changes and modifications based on the following embodiments. The following divisions of the various embodiments are for convenience of description, and should not be construed as limiting the specific implementations of the disclosure, and the various embodiments may be mutually combined and referred to without contradiction.

One embodiment of the present disclosure relates to a fiber vibration and attenuation dual-parameter simultaneous measurement apparatus 100, as shown in fig. 1, including a light source module 110, a light source processing module 120, a light receiving module 130, and a control and acquisition processing module 140.

The light source module 110 is connected to the light source processing module 120 and the light receiving module 130 via optical fibers, respectively. The light source processing module 120 is connected with the light receiving module 130 and the optical fiber 200 to be tested through optical fibers, respectively. The light source processing module 120 and the light receiving module 130 are electrically connected to the control and acquisition processing module 140, respectively.

The light source module 110 is used to provide composite light suitable for simultaneously detecting fiber vibration and fiber attenuation, and intrinsic light suitable for fiber vibration detection.

Illustratively, and in conjunction with FIG. 2, the light source module 110 includes first and second laser light sources 111, 112 with aligned center wavelengths, and a first DWDM (DENSE WAVELENGTH Division Multiplexing ) 113, an optical splitter 114, and a tunable attenuator 115. The first laser light source 111 is optically connected to the beam splitter 114. The reflective port of the first DWDM113 is optically coupled to the second laser light source 112, the transmissive port of the first DWDM113 is optically coupled to the optical splitter 114, and the incident port of the first DWDM113 is optically coupled to the light source processing module 120 via the optical fiber 101. The optical splitter 114 is also optically connected to an adjustable attenuator 115. The tunable attenuator 115 is connected to the light receiving module 130 through the optical fiber 102.

Illustratively, the linewidth of the first laser source 111 is less than the linewidth of the second laser source 112. In other words, the first laser light source 111 is a narrow linewidth light source, and the second laser light source 112 is a wide linewidth light source.

Illustratively, the linewidth of the first laser light source 111 is less than 100kHz, typically 3kHz, so that the continuous laser light beam provided by the first laser light source 111 can form an interference phenomenon on the rayleigh scattered light after being converted into the pulse light, thereby using the continuous laser light beam as a light beam for optical fiber vibration detection, and acquiring an optical fiber vibration signal using the light beam.

Illustratively, the linewidth of the second laser source 112 is greater than 100kHz, a typical value is represented by a wavelength of 10nm, and the typical value is represented by a frequency of about 1THz, so that the continuous laser beam provided by the second laser source 112 does not meet the rayleigh interference requirement after being converted into pulse light, and thus the continuous laser beam is used as a beam for detecting the intensity of the optical fiber, and the optical fiber attenuation signal is obtained by using the beam.

Illustratively, the splitting ratio of the splitter 114 is 50%:50%. In this case, the beam splitter 114 splits the continuous laser beam output by the first laser beam 111 into two paths in a ratio of 1:1: one path of the light is taken as intrinsic light suitable for optical fiber vibration detection, and is input into the light receiving module 130 through the optical fiber 102 after being regulated by the adjustable attenuator 115; the other path of light is input into the first DWDM113, and the light beam output by the second laser source 112 forms a composite light suitable for detecting the vibration of the optical fiber and the attenuation of the optical fiber at the same time under the action of the first DWDM, and the composite light is input into the light source processing module 120 through the optical fiber 101.

It should be noted that, the wavelength of the first laser light source 111 and the wavelength of the second laser light source 112 are located in adjacent channels, so that the wavelength of the first laser light source 111 and the wavelength of the second laser light source 112 can meet the following requirements: firstly, the central wavelength of the first laser source 111 and the central wavelength of the second laser source 112 can be ensured to be as close as possible, so that the propagation speeds of the output lasers corresponding to the central wavelength and the central wavelength in the optical fiber are approximately the same; secondly, the center wavelength of the first laser source 111 and the center wavelength of the second laser source 112 can be kept at a certain distance, so that the output lasers corresponding to the two can be distinguished by the first DWDM 113.

The light source processing module 120 is configured to convert the composite light into pulse light under the control of the control and acquisition processing module, amplify the pulse light, and inject the amplified pulse light into the optical fiber to be tested; and receiving the composite Rayleigh scattered light which is returned by the optical fiber to be detected and carries the optical fiber vibration signal and the optical fiber attenuation signal.

Illustratively, and in conjunction with FIG. 3, the optical source processing module 120 includes a pulse modulator 121, an EDFA (Erbiu-Doped Optical Fiber Amplifier, erbium doped fiber amplifier) 122, a circulator 123, a WDM (WAVELENGTH DIVISION MULTIPLEXING ) 124, and a second DWDM125.

The pulse modulator 121 is connected to the input port of the first DWDM113 via an optical fiber 101, the pulse modulator 121 is also optically connected to the EDFA122 and to the control and acquisition processing module 140 via a drive line 103. The EDFA122 is optically connected to a circulator 123. The circulator 123 is optically connected to the WDM 124. The input port of the second DWDM125 is optically coupled to the circulator 123, the transmission port of the second DWDM125 is coupled to the optical receiving module 130 via the optical fiber 104, and the reflection port of the second DWDM125 is coupled to the optical receiving module 130 via the optical fiber 105. WDM124 is also connected to an optical fiber 200 under test.

The pulse Modulator 121 may be an acousto-Optic Modulator (AOM), an electro-Optic Modulator, or the like capable of converting continuous composite light into pulsed light. The pulse modulator 121 receives the composite light provided from the light source module 110 through the optical fiber 101, and converts the composite light into pulse light under the control of the control and acquisition processing module 140 through the driving line 103. The pulse light is point amplified by the EDFA122 and then injected into the optical fiber under test 200 through the circulator 123 by the WDM 124. Illustratively, and with reference to FIG. 3, the light source processing module 120 further includes a Raman laser 126. The raman laser 126 is optically connected to the WDM124 and is configured to perform distributed amplification on the point-amplified pulse light, so as to enhance the light beam injected into the optical fiber 200 to be measured, and prolong the monitoring distance of the optical fiber 200 to be measured.

The composite rayleigh scattering light which is returned by the optical fiber 200 to be tested and carries the optical fiber vibration signal and the optical fiber attenuation signal sequentially enters the second DWDM125 through the WDM124 and the circulator 123, and is divided into interference rayleigh light I carrying the optical fiber vibration signal and non-interference rayleigh light II carrying the optical fiber attenuation signal under the action of the second DWDM 125. Interference rayleigh light-and non-interference rayleigh light enter the light receiving module 103 through the optical fiber 104 and the optical fiber 105, respectively.

The light receiving module 130 is used for converting the intrinsic light and the complex rayleigh scattered light into corresponding electrical signals.

Illustratively, and in conjunction with FIG. 4, the light receiving module 130 includes a balanced photodetector 131 and a photodetector 132. The balanced photodetector 131 is optically coupled to the tunable attenuator 115 via fiber 102 and to the transmission port of the second DWDM125 via fiber 104. The photodetector 132 is optically coupled to the reflective port of the second DWDM125 via an optical fiber 105, and the photodetector 132 is also electrically coupled to the control and acquisition processing module 140 via an electrical connection 106. The balance photodetector 131 is also electrically connected to the control and acquisition processing module 140 by an electrical connection 107.

In other words, the intrinsic light output by the adjustable attenuator 115 enters the balance light detector 131 through the optical fiber 102, the interference rayleigh light output by the second DWDM125, that is, the light beam carrying the optical fiber vibration signal enters the balance light detector 131 through the optical fiber 104, and after the balance light detector 131 converts the intrinsic light and the interference rayleigh light into corresponding electrical signals, the electrical signals are input to the control and acquisition processing module 140 through the electrical connection wire 107. The non-interference rayleigh light two beams, namely the optical fiber 105 carrying the optical fiber attenuation signals, enter the photoelectric detector 132, and after the photoelectric detector 132 converts the non-interference rayleigh light two beams into corresponding electric signals, the electric signals are input into the control and acquisition processing module 140 through the electric connection line 106.

The control and acquisition processing module 140 is used for controlling the light source processing module 120 to convert the composite light into pulse light; and performing data processing on the electric signals to obtain optical vibration information and optical attenuation information under the same coordinate system.

Illustratively, and in conjunction with FIG. 5, the control and acquisition processing module 140 includes a signal source 141, an acquisition card 142, and a data processing unit 143. The signal source 141 is connected to the pulse modulator 121 via a drive line 103, and the signal source 141 is also electrically connected to the acquisition card 142. The acquisition card 142 is also optically coupled to the photodetector 132 via optical fiber 106 and to the balanced photodetector 131 via optical fiber 107. The data processing unit 143 is electrically connected to the acquisition card 142.

In other words, the signal source 141 controls the pulse modulator 121 via the driving line 103 and controls the acquisition card 142 to acquire the electrical signal carrying the fiber attenuation signal and the electrical signal carrying the fiber vibration signal via the electrical connection line 106 and the electrical connection line 107, respectively. The data processing unit 143 performs data processing on the electric signal carrying the optical fiber attenuation signal and the electric signal carrying the optical fiber vibration signal to obtain optical attenuation information and optical vibration information in the same coordinate system.

The optical fiber vibration and attenuation double-parameter simultaneous measurement device provided by the embodiment not only can realize the optical fiber vibration and attenuation double-parameter simultaneous measurement by utilizing the composite light suitable for simultaneously detecting the optical fiber vibration and the optical fiber attenuation, reduces the total volume of the measurement device, but also can enable the optical attenuation information and the optical vibration information obtained by measurement to be in the same coordinate system, thereby providing effective guidance for the operation maintenance and the safety maintenance of the optical cable.

Another embodiment of the present disclosure relates to a method S100 for simultaneously measuring two parameters of vibration and attenuation of an optical fiber, the flow of which is shown in fig. 6, including:

Step S110, providing composite light suitable for detecting fiber vibration and fiber attenuation simultaneously, and intrinsic light suitable for fiber vibration detection.

Step S120, the composite light is converted into pulse light, the pulse light is amplified, and the amplified pulse light is injected into the optical fiber to be tested.

And step S130, receiving the composite Rayleigh scattered light which is returned by the optical fiber to be tested and carries the optical fiber vibration signal and the optical fiber attenuation signal.

Step S140, converting the intrinsic light and the complex rayleigh scattered light into corresponding electrical signals.

And step S150, performing data processing on the electric signals to obtain optical vibration information and optical attenuation information under the same coordinate system.

Compared with the prior art, the optical fiber vibration and attenuation dual-parameter simultaneous measurement can be realized by utilizing the composite light suitable for simultaneously detecting the optical fiber vibration and the optical fiber attenuation, and the optical attenuation information and the optical vibration information obtained by measurement can be positioned in the same coordinate system, so that effective guidance is provided for the operation maintenance of the optical cable and the safety maintenance of the optical cable.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments for carrying out the present disclosure, and that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure.

Claims (10)

1. The device for simultaneously measuring the optical fiber vibration and attenuation double parameters is characterized by comprising a light source module, a light source processing module, a light receiving module and a control and acquisition processing module; the light source module is respectively connected with the light source processing module and the light receiving module through optical fibers, the light source processing module is respectively connected with the light receiving module and the optical fibers to be tested through optical fibers, and the light source processing module and the light receiving module are respectively electrically connected with the control and acquisition processing module;

The light source module is used for providing composite light suitable for detecting optical fiber vibration and optical fiber attenuation simultaneously and intrinsic light suitable for optical fiber vibration detection;

The light source processing module is used for converting the composite light into pulse light under the control of the control and acquisition processing module, amplifying the pulse light and injecting the amplified pulse light into the optical fiber to be tested; and receiving composite Rayleigh scattered light which is returned by the optical fiber to be tested and carries an optical fiber vibration signal and an optical fiber attenuation signal;

The light receiving module is used for converting the intrinsic light and the composite Rayleigh scattered light into corresponding electric signals;

the control and acquisition processing module is used for controlling the light source processing module to convert the composite light into the pulse light; and performing data processing on the electric signals to obtain optical vibration information and optical attenuation information under the same coordinate system.

2. The measurement device of claim 1, wherein the light source module comprises a first laser light source, a second laser light source, a first DWDM, a beam splitter, a tunable attenuator;

The first laser light source is optically connected with the beam splitter; the reflection port of the first DWDM is optically connected with the second laser light source, the transmission port of the first DWDM is optically connected with the beam splitter, and the incidence port of the first DWDM is connected with the light source processing module through an optical fiber; the optical splitter is also optically connected with the adjustable attenuator; the adjustable attenuator is connected with the light receiving module through an optical fiber.

3. The measurement device of claim 2, wherein the light source processing module comprises a pulse modulator, an EDFA, a circulator, a WDM, a second DWDM;

The pulse modulator is connected with an incident port of the first DWDM through an optical fiber, is also connected with the EDFA, and is connected with the control and acquisition processing module through a driving wire; the EDFA is optically connected with the circulator; said circulator being optically connected to said WDM; the incident port of the second DWDM is optically connected with the circulator, and the reflection port of the second DWDM and the transmission port of the second DWDM are respectively connected with the optical receiving module through optical fibers; the WDM is also connected with the optical fiber to be tested.

4. A measurement device according to claim 3, wherein the light receiving module comprises a balanced light detector and a photo detector;

The balance optical detector is respectively and optically connected with the adjustable attenuator and the transmission port of the second DWDM, and is also electrically connected with the control and acquisition processing module; the photoelectric detector is optically connected with the reflection port of the second DWDM, and is also electrically connected with the control and acquisition processing module.

5. The measurement device of claim 4, wherein the control and acquisition processing module comprises a signal source, an acquisition card, a data processing unit;

The signal source is connected with the pulse modulator through the driving wire and is also electrically connected with the acquisition card; the acquisition card is also respectively and optically connected with the photoelectric detector and the balance light detector; the data processing unit is electrically connected with the acquisition card.

6. The measurement device of any one of claims 3 to 5, wherein the light source processing module further comprises a raman laser optically connected to the WDM.

7. The measurement device of any one of claims 2 to 5, wherein the wavelength of the first laser light source and the wavelength of the second laser light source are within adjacent channels.

8. The measurement device of claim 7, wherein a linewidth of the first laser source is less than a linewidth of the second laser source.

9. The measurement device of claim 8, wherein the linewidth of the first laser source is less than 100kHz and the linewidth of the second laser source is greater than 100kHz.

10. A method for simultaneously measuring two parameters of vibration and attenuation of an optical fiber, which is characterized by comprising the following steps:

Providing composite light suitable for detecting fiber vibration and fiber attenuation simultaneously and intrinsic light suitable for fiber vibration detection;

converting the composite light into pulse light, amplifying the pulse light, and injecting the amplified pulse light into an optical fiber to be tested;

Receiving composite Rayleigh scattered light which is returned by the optical fiber to be tested and carries an optical fiber vibration signal and an optical fiber attenuation signal;

converting the intrinsic light and the composite rayleigh scattered light into corresponding electrical signals;

And carrying out data processing on the electric signals to obtain optical vibration information and optical attenuation information under the same coordinate system.