Energy, information and sensing integrated device based on double-clad optical fiber and use method of energy, information and sensing integrated device

Abstract

The invention provides an energy, information and sensing integrated device based on a double-clad optical fiber and a using method, and the device comprises a communication transmitting end, a high-power laser transmitting end, the double-clad optical fiber, a photovoltaic converter, a communication receiving end and a sensing receiving end, and the communication transmitting end is in butt joint with the communication receiving end through a fiber core of the double-clad optical fiber; the optical communication modules are respectively used for transmitting and receiving demodulation of communication optical signals; the high-power laser transmitting end is connected with the photovoltaic converter through an inner cladding of the double-cladding optical fiber and is used for completing transmitting and receiving conversion of an energy optical signal respectively; the sensing receiving end is used for detecting and demodulating a Rayleigh scattering light signal returned from an optical fiber disturbance position so as to obtain the disturbance position; an energy optical signal and a communication optical signal are respectively transmitted through the inner cladding and the fiber core, mutual interference between the energy optical signal and the communication optical signal is reduced, and optical fiber disturbance is perceived and positioned, so that integration of energy optical signal transmission, communication optical signal transmission and sensing is realized.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber communication transmission technology, and in particular to an energy, signal and sensing integrated device based on double-clad optical fiber and a use method thereof. Background Art

[0002] With the development of 6G, large-capacity, multi-service, low-cost, and intelligent communication networks, the number of communication base stations and service terminals in the communication network is gradually increasing, and they are developing in the direction of miniaturization, intelligence, and passivity. Optical fiber communication networks are required to have more functions and be more intelligent. In addition, some occasions such as substations, mines, and nuclear power plants require communication energy transmission equipment to be free from electromagnetic interference and strong electromagnetic fields. Therefore, optical fiber energy and communication coexistence networks have emerged. However, most traditional optical fiber energy and communication coexistence networks use single-mode optical fibers for energy and communication co-transmission. The energy optical signal and the communication optical signal will interact with each other, affecting the quality of the communication optical signal. In the double-clad energy and communication co-transmission system, the transmitter usually uses a tapered fiber combiner to couple the energy optical signal and the communication optical signal into the optical fiber without separation optimization processing, resulting in a certain influence between the energy optical signal and the communication optical signal.

[0003] In view of this, overcoming the defects of the prior art is an urgent problem to be solved in the field of this technology. Summary of the invention

[0004] The technical problem to be solved by the present invention is how to reduce the mutual influence between energy optical signals and communication optical signals when optical fiber energy and communication signals coexist.

[0005] The present invention adopts the following technical solution: In the first aspect, an energy, information and sensing integrated device based on double-clad optical fiber is provided, comprising: a communication transmitting end 1, a high-power laser transmitting end 2, a double-clad optical fiber 3, a photovoltaic converter 4 and a communication receiving end 5, wherein: The double-clad optical fiber 3 comprises a core 31, an outer cladding 32 and an inner cladding 33, wherein the outer cladding 32 is located at the periphery of the core 31, and the inner cladding 33 is located between the outer cladding 32 and the core 31; The communication transmitting end 1 is connected to the communication receiving end 5 through the fiber core 31, and the communication transmitting end 1 is used to send a communication optical signal to the communication receiving end 5 through the fiber core 31, and the communication receiving end 5 is used to demodulate the communication optical signal; The high-power laser emitting end 2 is used to send an energy light signal to the photovoltaic converter 4 through the inner cladding 33 , and the photovoltaic converter 4 is used to convert the energy light signal into electrical energy.

[0006] Preferably, the energy, signal and sensing integrated device based on double-clad optical fiber further includes a sensor receiving end 6 and a circulator 7, wherein: The communication transmitting end 1 is connected to one port of the circulator 7, the fiber core 31 is connected to the second port of the circulator 7, and the sensor receiving end 6 is connected to the third port of the circulator 7; The circulator 7 is used to transmit the communication optical signal input from one port to the fiber core 31 through the two ports, and the circulator 7 is also used to receive the Rayleigh scattered optical signal in the fiber core 31 through the two ports and transmit it to the sensor receiving end 6 through the three ports; The sensor receiving end 6 is used to demodulate the Rayleigh scattered light signal to obtain the disturbance position information on the double-clad optical fiber 3 .

[0007] Preferably, the energy, signal and sensing integrated device based on double-clad optical fiber further includes a tapered beam combiner, wherein: The high-power laser emitting end 2 is connected to the inner cladding 33 through the tapered beam combiner, and the energy light signal emitted by the high-power laser emitting end 2 forms an angle less than a preset angle with the core 31 of the double-clad optical fiber 3; The preset angle is ; in, is the refractive index of the inner cladding, is the refractive index of the outer cladding.

[0008] Preferably, the communication transmitting end 1 comprises a narrow linewidth laser 11 and a modulator 12, wherein: The input end of the modulator 12 is connected to the output end of the narrow linewidth laser 11, and the output end of the modulator 12 is connected to the input end of the circulator 7; The modulator 12 is used to modulate the optical signal emitted by the narrow linewidth laser 11 to obtain a communication optical signal, and transmit the communication optical signal to the fiber core 31 .

[0009] Preferably, the refractive index of the core 31 is Greater than the refractive index of the inner cladding 33 , the refractive index of the inner cladding 33 is Greater than the refractive index of the outer cladding 32 .

[0010] Preferably, the wavelength interval between the wavelength of the communication optical signal and the wavelength of the energy optical signal is greater than 5 nm.

[0011] In a second aspect, a method for using an energy, information and sensing integrated device based on a double-clad optical fiber is provided, which is used for application on the energy, information and sensing integrated device based on a double-clad optical fiber, comprising: The communication transmitting end 1 sends a communication optical signal to the communication receiving end 5 through the core 31 of the double-clad optical fiber 3, and the communication receiving end 5 demodulates the received communication optical signal; The high-power laser emitting end 2 sends an energy light signal to the photovoltaic converter 4 through the inner cladding 33 of the double-clad optical fiber 3, and the photovoltaic converter 4 converts the received energy light signal into electrical energy.

[0012] Preferably, the photovoltaic converter 4 converts the received energy light signal into electrical energy, specifically including: The calculation formula for converting the received energy light signal into electrical energy by the photovoltaic converter 4 is: ; in, is the current after the energy light signal is converted, is the optical power of the energy optical signal, is the loss factor of the energy optical signal transmitted in the inner cladding 33, is the photoelectric responsivity of the photovoltaic converter 4 .

[0013] Preferably, the energy, communication and sensing integrated device based on double-clad optical fiber further comprises a sensor receiving end 6 and a circulator 7, the communication transmitting end 1 is connected to one port of the circulator 7, the core 31 of the double-clad optical fiber 3 is connected to the second port of the circulator 7, and the sensor receiving end 6 is connected to the third port of the circulator 7; The circulator 7 transmits the communication optical signal input from one port to the core 31 of the double-clad optical fiber 3 through the second port, and the circulator 7 also receives the Rayleigh scattered optical signal in the core 31 through the second port and transmits it to the sensor receiving end 6 through the third port; The sensor receiving end 6 demodulates the received Rayleigh scattered light signal to obtain the disturbance position information on the double-clad optical fiber 3 .

[0014] Preferably, the sensor receiving end 6 demodulates the received Rayleigh scattered light signal to obtain the disturbance position information on the double-clad optical fiber 3, specifically including: The sensor receiving end 6 performs photoelectric conversion on the received Rayleigh scattered light signal to obtain a current after the Rayleigh scattered light signal is converted. The expression of the current after the Rayleigh scattered light signal is: ; in, is the current after the Rayleigh scattered light signal is converted at the sensor receiving end 6, is the optical power of the energy optical signal, is the total loss factor of the energy optical signal from the input end of the inner cladding 33 to the disturbance position and from the disturbance position to the sensor receiving end 6, is the Rayleigh scattering coefficient of the energy light signal, is the coupling coefficient of the Rayleigh scattered energy light signal coupled to the fiber core 31, is the optical power of the communication optical signal, is the total loss factor of the communication optical signal from the input end of the inner cladding 33 to the disturbance position and from the disturbance position to the sensor receiving end 6, is the Rayleigh scattering coefficient of the communication optical signal, is the photoelectric responsivity of the photoelectric converter of the sensor receiving end 6; Calculate the current after the Rayleigh scattered light signal is converted The relative time of the peak of is obtained to obtain the disturbance position on the double-clad optical fiber 3, and the calculation formula is as follows: ; in, is the distance from the disturbance position on the double-clad optical fiber 3 to the communication transmitting end 1, c is the speed of light in vacuum, is the refractive index of the core 31, is the current converted from the Rayleigh scattered light signal The relative time at which the peak occurs.

[0015] The present invention provides an energy, communication and sensing integrated device based on double-clad optical fiber, comprising: a communication transmitting end 1, a high-power laser transmitting end 2, a double-clad optical fiber 3, a photovoltaic converter 4 and a communication receiving end 5, wherein: the communication transmitting end 1 is connected to the communication receiving end 5 through the core 31 of the double-clad optical fiber 3, the communication transmitting end 1 is used to send a communication optical signal to the communication receiving end 5 through the core 31 of the double-clad optical fiber 3, and the communication receiving end 5 is used to demodulate the received communication optical signal; the high-power laser transmitting end 2 is connected to the photovoltaic converter 4 through the inner cladding 33 of the double-clad optical fiber 3, and ... The rate laser transmitting end 2 is used to send an energy light signal to the photovoltaic converter 4 through the inner cladding 33 of the double-clad optical fiber 3, and the photovoltaic converter 4 is used to convert the received energy light signal into electrical energy; the sensor receiving end 6 is used to demodulate the Rayleigh scattered light signal to obtain the disturbance position information on the double-clad optical fiber 3; the energy light signal and the communication light signal are transmitted through the inner cladding 33 and the core 31 respectively, so as to reduce the mutual interference between the energy light signal and the communication light signal, and sense the optical fiber disturbance, so as to realize the integration of energy light signal transmission, communication light signal transmission and sensing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic structural diagram of an energy, signal and sensing integrated device based on double-clad optical fiber provided by an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a double-clad optical fiber in an energy, signal and sensing integrated device based on a double-clad optical fiber provided by an embodiment of the present invention; Figure 3 It is a cross-section diagram of a double-clad optical fiber and a cross-section diagram of transmission of an energy optical signal and a communication optical signal in an energy, signal and sensing integrated device based on a double-clad optical fiber provided by an embodiment of the present invention; Figure 4 It is a schematic structural diagram of another energy, signal and sensing integrated device based on double-clad optical fiber provided by an embodiment of the present invention; Figure 5 It is a structural schematic diagram of another energy, signal and sensing integrated device based on double-clad optical fiber provided by an embodiment of the present invention; Figure 6 It is a method flow chart of a method for using an energy, signal and sensing integrated device based on double-clad optical fiber provided by an embodiment of the present invention; Figure 7 It is a method flow chart of a method for obtaining a disturbance position on a double-clad optical fiber in a method for using an energy, information and sensing integrated device based on a double-clad optical fiber provided by an embodiment of the present invention; The accompanying drawings are numbered as follows: Communication transmitting end 1; narrow linewidth laser 11; modulator 12; high power laser transmitting end 2; double-clad optical fiber 3; fiber core 31; outer cladding 32; inner cladding 33; photovoltaic converter 4; communication receiving end 5; sensor receiving end 6; circulator 7. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0020] In the description of the present invention, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "multiple" is two or more. In addition, for example, the same type of nouns may be described as two independent individuals by adding "A" and "B" at the end. In this case, the corresponding features defined as "A" and "B" are only used to distinguish the same type of individuals for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0021] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity, i.e., the limitations of the measurement system.

[0022] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as open inclusion, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner, that is, although they may be carried in the embodiments or examples of the above terms due to reasons such as the order and position of appearance, it is not limited to that they can be carried in combination by one embodiment or example.

[0023] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] Embodiment 1: Embodiment 1 of the present invention provides an energy-information-sensing integrated device based on double-clad optical fiber, such as Figure 1 As shown, it includes: a communication transmitting end 1, a high-power laser transmitting end 2, a double-clad optical fiber 3, a photovoltaic converter 4 and a communication receiving end 5, wherein: like Figure 1 and Figure 2 As shown, the double-clad optical fiber 3 includes a core 31 , an outer cladding 32 and an inner cladding 33 . The outer cladding 32 is located at the periphery of the core 31 , and the inner cladding 33 is between the outer cladding 32 and the core 31 .

[0025] In this embodiment, the core 31 is located at the central axis of the double-clad optical fiber 3, the outer cladding 32 and the protective layer outside the outer cladding 32 are used as the protective outer layer of the entire double-clad optical fiber 3, and the inner cladding 33 is located between the core 31 and the outer cladding 32. The energy light signal can be incident on the inner cladding 33 in the form of oblique rays, and is transmitted through multiple reflections in the form of oblique rays on the inner side wall of the inner cladding 33, thereby realizing transmission from one end of the double-clad optical fiber 3 to the other end of the double-clad optical fiber 3, thereby effectively separating the light signal transmitted in the inner cladding 33 from the light signal transmitted in the core 31.

[0026] The communication transmitting end 1 is connected to the communication receiving end 5 through the optical fiber core 31. The communication transmitting end 1 is used to send a communication optical signal to the communication receiving end 5 through the optical fiber core 31. The communication receiving end 5 is used to demodulate the communication optical signal.

[0027] The photovoltaic converter 4 is a ring-shaped photovoltaic converter, which can receive almost all energy light signals, greatly increasing the amount of energy light signals received and improving the amount of energy conversion.

[0028] In this embodiment, the communication transmitting end 1 is used to emit narrow linewidth laser, and modulate the narrow linewidth laser to obtain the communication optical signal, and the communication optical signal is transmitted along the meridian ray in the fiber core 31.

[0029] The high-power laser emitting end 2 is used to send an energy light signal to the photovoltaic converter 4 through the inner cladding 33 , and the photovoltaic converter 4 is used to convert the energy light signal into electrical energy.

[0030] like Figure 1-Figure 3 As shown, in this embodiment, the high-power laser emitting end 2 is connected to the inner cladding 33 of the double-clad optical fiber 3 through the tapered beam combiner, and the energy light signal emitted by the high-power laser emitting end 2 forms an angle less than a preset angle with the core 31 of the double-clad optical fiber 3; the preset angle is ,in, is the refractive index of the inner cladding, The high-power laser emitting end 2 injects the energy light signal into the inner cladding 33 in the form of oblique rays through the tapered beam combiner, so that the energy light signal is reflected and transmitted multiple times in the form of oblique rays around the core 31 in the inner cladding 33 until it reaches the other end of the double-clad optical fiber 3 and is received by the photovoltaic converter 4. Figure 3 As shown in FIG. 3 , it is a cross-sectional view of a double-clad optical fiber 3. It can be seen from the figure that the energy optical signal is transmitted through multiple reflections in the form of oblique rays on the side of the core 31. Most of the energy optical signal will not pass through the core 31, which greatly reduces the mutual influence between the energy optical signal and the communication optical signal. Figure 3 From the cross-sectional diagram in FIG, the cross-section of the inner cladding 33 is in the shape of a circular ring, and the center of the inner cladding 33 is the core 31. Therefore, in order to ensure that the photovoltaic converter 4 can fit the inner cladding 33, a circular photovoltaic converter 4 can be used to match the cross-section of the inner cladding 33, thereby increasing the amount of energy light signals received and improving the amount of energy conversion.

[0031] It should be noted that in this embodiment, in order to realize the transmission of energy light signals by the inner cladding 33, the refractive index of the core 31, the refractive index of the inner cladding 33 and the refractive index of the outer cladding 32 have the following requirements: Greater than the refractive index of the inner cladding 33 , the refractive index of the inner cladding 33 is Greater than the refractive index of the outer cladding 32 At the same time, the communication optical signal and the energy optical signal need to be optical signals of different wavelengths, and the wavelength interval is greater than 5nm. Through the above design, the communication optical signal can be totally reflected at the interface between the core and the inner cladding and transmitted along the core, and the energy optical signal can be totally reflected at the interface between the inner cladding and the outer cladding and transmitted along the inner cladding.

[0032] In this embodiment, the energy optical signal and the communication optical signal are transmitted respectively through the inner cladding 33 and the core 31, thereby reducing the mutual interference between the energy optical signal and the communication optical signal, thereby realizing the integration of energy optical signal transmission and communication optical signal transmission.

[0033] In order to further improve the diversity and integration of the functions of the device, the sensing function can also be added to the energy-information-sensing integrated device based on double-clad optical fiber, and the disturbance position can be monitored and acquired by receiving and demodulating the Rayleigh scattering signal. Therefore, this embodiment also involves the following designs: like Figure 4As shown, the energy-information-sensing integrated device based on double-clad optical fiber also includes a sensor receiving end 6 and a circulator 7, wherein: the communication transmitting end 1 is connected to one port of the circulator 7, the fiber core 31 is connected to two ports of the circulator 7, and the sensor receiving end 6 is connected to three ports of the circulator 7; the circulator 7 is used to transmit the communication optical signal input from one port to the fiber core 31 through the two ports, and the circulator 7 is also used to receive the Rayleigh scattered light signal in the fiber core 31 through the two ports and transmit it to the sensor receiving end 6 through the three ports; the sensor receiving end 6 is used to demodulate the Rayleigh scattered light signal to obtain the disturbance position information on the double-clad optical fiber 3.

[0034] In this embodiment, when a disturbance occurs at a certain position in the double-clad optical fiber 3, strong Rayleigh scattering will occur at that position, and the Rayleigh scattered optical signal will be reflected back in the opposite direction of the optical signal transmission direction. The reflected Rayleigh scattered optical signal is received and demodulated by the sensor receiving end 6, and the return time is calculated to obtain the position where the disturbance occurs on the double-clad optical fiber 3, so as to realize real-time monitoring of the double-clad optical fiber 3 and improve the intelligence level of the link. The optical signal input from one port of the circulator 7 can only be output from the second port, that is, the communication optical signal can only be input from the first port and output from the second port to the fiber core 31, and the optical signal input from the second port of the circulator 7 can only be output from the third port of the circulator 7, and will not be output from the first port. Therefore, the Rayleigh scattered optical signal reflected from the fiber core 31 will only be output from the third port after being input from the second port and received by the sensor optical signal. The designated transmission and reception of different optical signals are realized by the circulator 7.

[0035] Furthermore, since the energy light signal and the communication light signal are transmitted in the same optical fiber, a portion of the backscattered light of the energy light signal at the disturbance position of the double-clad optical fiber 3 will also be coupled into the fiber core 31 and transmitted to the sensor receiving end 6 as a part of the Rayleigh scattered light signal. Compared with the Rayleigh scattered light signal generated by the communication light signal alone, the intensity of the Rayleigh scattered light signal in this embodiment is higher, thereby improving the sensing sensitivity, reducing the sensitivity requirements of the photodetector in the sensor receiving end 6, and saving the cost of accessories in the device.

[0036] Furthermore, since the communication optical signal needs to be obtained by modulating a narrow linewidth laser, the communication receiving end 5 in this embodiment requires a laser and a corresponding modulation device, so this embodiment also involves the following designs: like Figure 5As shown, the communication transmitting end 1 includes a narrow linewidth laser 11 and a modulator 12, wherein: the input end of the modulator 12 is connected to the output end of the narrow linewidth laser 11, and the output end of the modulator 12 is connected to the input end of the circulator 7; the modulator 12 is used to modulate the optical signal emitted by the narrow linewidth laser 11 to obtain a communication optical signal, and transmit the communication optical signal to the fiber core 31.

[0037] In this embodiment, the modulator 12 may be a differential phase shift keying (DPSK) modulator, and the demodulation device in the communication receiving end 5 may be a DPSK demodulator.

[0038] Embodiment 2: Based on Example 1, this embodiment provides a method for using an energy, information and sensing integrated device based on a double-clad optical fiber, which is used in the energy, information and sensing integrated device based on a double-clad optical fiber as described in Example 1. Figure 6 As shown, including: In step 101, the communication transmitting end 1 sends a communication optical signal to the communication receiving end 5 through the core 31 of the double-clad optical fiber 3, and the communication receiving end 5 demodulates the received communication optical signal.

[0039] In this embodiment, the emission angular frequency of the narrow linewidth laser 11 in the communication transmitting end 1 is The narrow line width laser is expressed as: ; in, is the optical power of the communication optical signal, is the initial phase of the narrow linewidth laser, is the mathematical expression of the emitted narrow linewidth laser signal, and t is the time.

[0040] The modulator 12 in the communication transmitting end 1 modulates the narrow line width laser to obtain a communication optical signal, and the expression of the communication optical signal is: ; in, is the mathematical expression of the communication optical signal after the narrow linewidth laser signal is modulated, t is the time, is the optical power of the communication optical signal, is the initial phase of the narrow linewidth laser, is the phase of modulation, , representing different communication digital signals respectively.

[0041] In step 102, the high-power laser emitting end 2 sends an energy light signal to the photovoltaic converter 4 through the inner cladding 33 of the double-clad optical fiber 3, and the photovoltaic converter 4 converts the received energy light signal into electrical energy.

[0042] The output frequency of the high power laser transmitting end 2 is The energy light signal is expressed as follows: y ; Among them, y is the mathematical expression of the energy light signal, t is the time, is the optical power of the energy optical signal, The initial phase of the energy optical signal.

[0043] In this embodiment, the photovoltaic converter 4 is used to convert the received energy light signal into electrical energy, and store the electrical energy or use it to power the load, specifically including: the calculation formula for the photovoltaic converter 4 to convert the received energy light signal into electrical energy is: ; in, is the current after the energy light signal is converted, is the optical power of the energy optical signal, is the loss factor of the energy optical signal transmitted in the inner cladding 33, is the photoelectric responsivity of the photovoltaic converter 4 .

[0044] Correspondingly, the present embodiment also includes a corresponding sensing function, and the corresponding design is: the energy-communication-sensing integrated device based on double-clad optical fiber also includes a sensor receiving end 6 and a circulator 7, the communication transmitting end 1 is connected to one port of the circulator 7, the core 31 of the double-clad optical fiber 3 is connected to the second port of the circulator 7, and the sensor receiving end 6 is connected to the third port of the circulator 7.

[0045] like Figure 7 As shown, the corresponding implementation method of the sensing function is: In step 201, the circulator 7 transmits the communication optical signal input from one port to the core 31 of the double-clad optical fiber 3 through the second port, and the circulator 7 also receives the Rayleigh scattered optical signal in the core 31 through the second port and transmits it to the sensor receiving end 6 through the third port.

[0046] In step 202 , the sensor receiving end 6 demodulates the received Rayleigh scattered light signal to obtain the disturbance position information on the double-clad optical fiber 3 .

[0047] The sensor receiving end 6 performs photoelectric conversion on the received Rayleigh scattered light signal to obtain a current after the Rayleigh scattered light signal is converted. The expression of the current after the Rayleigh scattered light signal is: ; in, is the current after the Rayleigh scattered light signal is converted at the sensor receiving end 6, is the optical power of the energy optical signal, is the total loss factor of the energy optical signal from the input end of the inner cladding 33 to the disturbance position and from the disturbance position to the sensor receiving end 6, is the Rayleigh scattering coefficient of the energy light signal, is the coupling coefficient of the Rayleigh scattered energy light signal coupled to the fiber core 31, is the optical power of the communication optical signal, is the total loss factor of the communication optical signal from the input end of the inner cladding 33 to the disturbance position and from the disturbance position to the sensor receiving end 6, is the Rayleigh scattering coefficient of the communication optical signal, is the photoelectric responsivity of the photoelectric converter at the sensor receiving end 6.

[0048] Calculate the current after the Rayleigh scattered light signal is converted The relative time of the peak of is obtained to obtain the disturbance position on the double-clad optical fiber 3, and the calculation formula is as follows: ; in, is the distance from the disturbance position on the double-clad optical fiber 3 to the communication transmitting end 1, c is the speed of light in vacuum, is the refractive index of the core 31, is the current converted from the Rayleigh scattered light signal The relative time at which the peak occurs.

[0049] In summary, the present embodiment can achieve the following beneficial effects through corresponding devices and methods: 1. The present invention provides an integrated energy, communication and sensing device based on double-clad optical fiber and a method of use, which integrates optical fiber power supply, communication and distributed sensing through double-clad optical fiber 3, thereby improving the integration and intelligence of the optical fiber energy and communication transmission device.

[0050] 2. A ring-shaped photovoltaic converter 4 is used. The ring-shaped photovoltaic converter 4 matches the shape of the inner cladding interface, so that the ring-shaped photovoltaic converter 4 can receive almost all energy light signals, greatly increasing the amount of energy light signals received and improving the amount of energy conversion.

[0051] 3. Since the energy light signal and the communication light signal are transmitted in the same optical fiber, the backscattered light of a part of the energy light signal at the disturbance position of the double-clad optical fiber 3 will be coupled into the fiber core 31 and transmitted to the sensor receiving end 6 as a part of the Rayleigh scattered light signal, thereby increasing the intensity of the Rayleigh scattered light signal, improving the sensor sensitivity, reducing the requirements for high-sensitivity photoelectric detectors, and saving the cost of components in the device.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated energy, information and sensing device based on double-clad optical fiber, characterized in that: include: A communication transmitting end (1), a high-power laser transmitting end (2), a double-clad optical fiber (3), a photovoltaic converter (4) and a communication receiving end (5), wherein: The double-clad optical fiber (3) comprises a core (31), an outer cladding (32) and an inner cladding (33), wherein the outer cladding (32) is located at the periphery of the core (31), and the inner cladding (33) is located between the outer cladding (32) and the core (31); The communication transmitting end (1) is connected to the communication receiving end (5) via the optical fiber core (31), the communication transmitting end (1) is used to send a communication optical signal to the communication receiving end (5) via the optical fiber core (31), and the communication receiving end (5) is used to demodulate the communication optical signal; The high-power laser emitting end (2) is used to send an energy light signal to the photovoltaic converter (4) through the inner cladding (33), and the photovoltaic converter (4) is used to convert the energy light signal into electrical energy.

2. The energy, information and sensing integrated device based on double-clad optical fiber according to claim 1, characterized in that: The energy, signal and sensing integrated device based on double-clad optical fiber also includes a sensor receiving end (6) and a circulator (7), wherein: The communication transmitting end (1) is connected to one port of the circulator (7), the fiber core (31) is connected to the second port of the circulator (7), and the sensor receiving end (6) is connected to the third port of the circulator (7); The circulator (7) is used to transmit the communication optical signal input from the first port to the optical fiber core (31) through the second port, and the circulator (7) is also used to receive the Rayleigh scattered optical signal in the optical fiber core (31) through the second port and transmit it to the sensor receiving end (6) through the third port; The sensor receiving end (6) is used to demodulate the Rayleigh scattered light signal to obtain disturbance position information on the double-clad optical fiber (3).

3. The energy, information and sensing integrated device based on double-clad optical fiber according to claim 1, characterized in that: The energy, signal and sensing integrated device based on double-clad optical fiber also includes a tapered beam combiner, wherein: The high-power laser emitting end (2) is connected to the inner cladding (33) via the tapered beam combiner, and an energy optical signal emitted by the high-power laser emitting end (2) forms an angle less than a preset angle with the core (31) of the double-clad optical fiber (3); The preset angle is ; in, is the refractive index of the inner cladding, is the refractive index of the outer cladding.

4. The energy, information and sensing integrated device based on double-clad optical fiber according to claim 2, characterized in that: The communication transmitting end (1) comprises a narrow line width laser (11) and a modulator (12), wherein: The input end of the modulator (12) is connected to the output end of the narrow linewidth laser (11), and the output end of the modulator (12) is connected to the input end of the circulator (7); The modulator (12) is used to modulate the optical signal emitted by the narrow linewidth laser (11) to obtain a communication optical signal, and transmit the communication optical signal to the fiber core (31).

5. The energy, information and sensing integrated device based on double-clad optical fiber according to claim 1, characterized in that: The refractive index of the fiber core (31) Greater than the refractive index of the inner cladding (33) , the refractive index of the inner cladding (33) Greater than the refractive index of the outer cladding (32) .

6. The energy, information and sensing integrated device based on double-clad optical fiber according to claim 1, characterized in that: The wavelength interval between the wavelength of the communication optical signal and the wavelength of the energy optical signal is greater than 5 nm.

7. A method for using an energy, information and sensing integrated device based on a double-clad optical fiber, which is used in the energy, information and sensing integrated device based on a double-clad optical fiber as claimed in any one of claims 1 to 6, characterized in that: include: The communication transmitting end (1) sends a communication optical signal to the communication receiving end (5) through the core (31) of the double-clad optical fiber (3), and the communication receiving end (5) demodulates the received communication optical signal; The high-power laser emitting end (2) sends an energy light signal to the photovoltaic converter (4) through the inner cladding (33) of the double-cladding optical fiber (3), and the photovoltaic converter (4) converts the received energy light signal into electrical energy.

8. The method for using the energy, information and sensing integrated device based on double-clad optical fiber according to claim 7, characterized in that: The photovoltaic converter (4) converts the received energy light signal into electrical energy, specifically comprising: The calculation formula for converting the received energy light signal into electrical energy by the photovoltaic converter (4) is: ； in, is the current after the energy light signal is converted, is the optical power of the energy optical signal, is the loss factor of the energy optical signal transmitted in the inner cladding (33), is the photoelectric responsivity of the photovoltaic converter (4).

9. The method for using the energy, information and sensing integrated device based on double-clad optical fiber according to claim 7, characterized in that: The energy, communication and sensing integrated device based on double-clad optical fiber also includes a sensor receiving end (6) and a circulator (7), the communication transmitting end (1) is connected to one port of the circulator (7), the core (31) of the double-clad optical fiber (3) is connected to the second port of the circulator (7), and the sensor receiving end (6) is connected to the third port of the circulator (7); The circulator (7) transmits the communication optical signal input from one port to the core (31) of the double-clad optical fiber (3) through the two ports, and the circulator (7) also receives the Rayleigh scattered optical signal in the core (31) through the two ports and transmits it to the sensor receiving end (6) through the three ports; The sensor receiving end (6) demodulates the received Rayleigh scattered light signal to obtain disturbance position information on the double-clad optical fiber (3).

10. The method for using the energy, information and sensing integrated device based on double-clad optical fiber according to claim 9, characterized in that: The sensor receiving end (6) demodulates the received Rayleigh scattered light signal to obtain the disturbance position information on the double-clad optical fiber (3), specifically including: The sensor receiving end (6) performs photoelectric conversion on the received Rayleigh scattered light signal to obtain a current after the Rayleigh scattered light signal is converted. The expression of the current after the Rayleigh scattered light signal is: ； in, is the current converted from the Rayleigh scattered light signal at the sensor receiving end (6), is the optical power of the energy optical signal, is the total loss factor of the energy optical signal from the input end of the inner cladding (33) to the disturbance position and from the disturbance position to the sensor receiving end (6), is the Rayleigh scattering coefficient of the energy light signal, is the coupling coefficient of the Rayleigh scattered energy light signal coupled to the fiber core (31), is the optical power of the communication optical signal, is the total loss factor of the communication optical signal from the input end of the inner cladding (33) to the disturbance position and from the disturbance position to the sensor receiving end (6), is the Rayleigh scattering coefficient of the communication optical signal, is the photoelectric responsivity of the photoelectric converter at the sensor receiving end (6); Calculate the current after the Rayleigh scattered light signal is converted The relative time of the peak appearance of is used to obtain the disturbance position on the double-clad optical fiber (3), and the calculation formula is as follows: ； in, is the distance from the disturbance position on the double-clad optical fiber (3) to the communication transmitting end (1), c is the speed of light in vacuum, is the refractive index of the core (31), is the current converted from the Rayleigh scattered light signal The relative time at which the peak occurs.

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