224 results about "Pigtail" patented technology

The invention provides an LNG ship containment system monitoring system and method based on a fiber bragg grating sensor, and belongs to the crossing field of fiber sensing technology and ship safety engineering, the system comprises a fiber bragg grating sensor and a demodulation device, the fiber bragg grating sensor is used for collecting optical signals, and the demodulation device converts the optical signals into electric signals and processes the electric signals. The fiber bragg grating sensor adopts a double-grating structure and is respectively used for stress monitoring and temperature compensation so as to realize omnibearing real-time monitoring. The fiber grating sensor comprises a tail fiber, a protective tube, a base, and a strain grating, a spring and a temperature grating which are located in the protective tube. According to the invention, the monitoring precision and safety of the LNG ship containment system can be improved; through a double-grating temperature compensation technology, the influence of temperature change on stress measurement is eliminated, and the accuracy and reliability of data are ensured; in addition, stress information in different directions can be obtained in real time through the three-dimensional stress monitoring scheme, the stress condition of the structure is comprehensively reflected, and the flexibility and adaptability of monitoring are improved.

An optical fiber clamp comprises a clamp seat and N fixing assemblies, and the N fixing assemblies are elastically connected with the clamp seat. After N MT optical fibers are fixed by the optical fiber clamp, the optical fiber clamp can be inserted into the optical fiber adapter, and N is an integer greater than or equal to 2. Each MT optical fiber comprises an MT insertion core and a tail fiber. N mounting parts are arranged on two opposite wall surfaces of the clamping seat, and the N mounting parts are respectively used for mounting and fixing N tail fibers. The N fixing assemblies are respectively used for fixing the N MT insertion cores. According to the optical fiber clamp, N MT optical fibers can be fixed, integrated plugging of the N MT optical fibers can be achieved, and on the premise that the size of an existing optical fiber adapter interface is not changed, the number of the optical fibers is further increased by increasing the number of the MT insertion cores in the optical fiber adapter interface. After the optical fiber clamp which is plugged for multiple times deforms and is damaged, the optical fiber clamp can be simply replaced, and the whole MT optical fiber does not need to be scrapped.

The embodiment of the invention provides an optical communication assembly which is applied to the optical communication field and the optical fiber communication field. The optical communication assembly comprises an optical transmitter and a first tail fiber. The light emitter is connected with the first tail fiber. The first tail fiber and the first optical fiber are connected through a first optical port connector. The first tail fiber is a plastic optical fiber. The first optical fiber is a glass optical fiber. The optical transmitter is used for generating a first optical signal and transmitting the first optical signal to the other optical communication assembly through the first tail fiber and the first optical fiber. In the technical scheme provided by the invention, the plastic optical fiber and the glass optical fiber are combined for use, so that the noise can be reduced, and low-cost and high-quality optical communication is realized.

The invention provides a feed tracking control method for pigtail wishbone deboning operation, and the method comprises the steps: obtaining an X-ray image of a pigtail position, and obtaining an optimal deboning track according to the image information in the X-ray image; according to the inclination angle of the deboning knife and the deboning force difference value range, the optimal deboning track is divided into a deboning complex section and a deboning simple section, it can be ensured that the deboning robot adopts a proper deboning method in different deboning road sections, the deboning difficulty of the deboning complex section is ranked, color mapping is conducted on the optimal deboning track, and the deboning accuracy of the deboning robot is improved. Matching the trajectory information with the force information to obtain an optimal deboning trajectory with force sense form points; the cutting position, the cutting force and the cutting angle of the deboning cutter are adjusted in real time according to the force sense form points on the deboning track, deboning is carried out according to the optimal deboning track, and the deboning accuracy of the pigtail wishbone and the smoothness of the deboning section are improved.

A multicore fiber cable fanout device configured to connect a multicore fiber (MCF) cable comprising M MCFs having N cores with M×N single core fiber (SCP) pigtails is provided. The fanout device can include a housing enclosure and M MCF-to-SCF fanouts within the housing enclosure. The M×N SCF pigtails can be grouped in M×N / K SCF groups containing K SCF pigtails.

The invention relates to the field of photoelectric equipment, in particular to a separable active optical cable structure and photoelectric equipment. Comprising a photoelectric conversion assembly and a butt joint optical fiber plug which are connected, and the photoelectric conversion assembly comprises a shell, an electric connector, a photoelectric conversion module and a butt joint port; one end of the photoelectric conversion module is connected with the electric connector, the other end of the photoelectric conversion module is connected with the butt joint port, a cavity is formed in the shell, and a first opening and a second opening are formed in the two opposite sides of the cavity respectively; according to the invention, the photoelectric conversion assembly is designed as an independent part, so that the photoelectric conversion assembly can be independently produced and tested, and the photoelectric conversion assembly can be completely separated from the optical cable assembly through the matched butt joint optical fiber plug; the butt-joint optical fiber plug is connected with the photoelectric conversion assembly in a pluggable mode, the tail fiber switching link is eliminated, optical signals can be directly transmitted to the photoelectric conversion assembly from the optical cable assembly through the butt-joint optical fiber plug, and energy loss of the optical signals in the transmission process is reduced.

The present application relates to a fiber optic gyroscope with stress compensation. In addition to the existing fiber optic gyroscope comprising a light source, a coupler, a Y-waveguide, a fiber optic ring, a detector, and a signal processing circuit, a temperature sensor and a piezoelectric ceramic are added. The coupler is connected to the light source, the detector, and the Y-waveguide, respectively; and the signal control circuit is connected to the detector, the temperature sensor, the Y-waveguide, and the piezoelectric ceramic, respectively. Since the fiber optic ring is wound with a first optical fiber and a second optical fiber, the Y-waveguide and the fiber optic ring are connected via a first optical fiber pigtail and a second optical fiber pigtail, and the first optical fiber pigtail or the second optical fiber pigtail is also wound around the piezoelectric ceramic. During operation, the signal processing circuit controls the piezoelectric ceramic in real time to perform pressure compensation on the first optical fiber pigtail or the second optical fiber pigtail wound around the piezoelectric ceramic based on the sensitive angular velocity information and temperature information of the fiber optic gyroscope, thereby balancing the stress values ​​on both sides and thereby compensating for the zero drift of the fiber optic gyroscope caused by stress.

The invention provides a welding-free redundancy-free optical fiber distribution box, and the distribution box comprises a housing which is provided with a drawing groove, one side of the drawing groove is provided with an opening, and the other side, opposite to the opening, of the drawing groove is provided with a buffer part; the optical fiber is arranged in the drawing box, and the drawing box slides in the drawing groove and can at least partially slide out of the opening; a connector fixing groove is formed in the end, facing the buffer piece, of the drawing box, and an optical fiber connector is connected to the end of the optical fiber and fixed to the connector fixing groove; the optical fiber adapter is connected with the optical fiber connector in an inserted mode, supporting plates are arranged on the two sides of the optical fiber adapter, and the supporting plates abut against the buffering pieces; and the tail fiber joint is inserted into the other end, opposite to the optical fiber connector, of the optical fiber adapter. According to the invention, the problems that the optical fiber is fixed in a welding manner, the expansibility is poor, and a redundant link is required to be arranged, so that the link structure of the distribution box is complicated and the size is large are solved.

The invention discloses a pigtail-free optical module, an assembling method and a using method, optical signals are transmitted through a first lens array, a reflector and a second lens array, then optical fibers are arranged in an MT fixer on the outer side, optical paths are coupled, the optical fibers do not need to be inserted into a shell, the risks of air leakage of welded optical fibers and damage to the optical fibers do not exist, and the service life of the optical fibers is prolonged. The coupling process is simple, the structure has no requirement on the length of the optical fiber, the adaptability is higher, the original metal optical fiber is replaced, and the optical module can be subjected to reflow soldering to realize airtight packaging.

The invention relates to an inverse wavelength filter and a use method thereof. The inverse wavelength filter comprises a Lyot filter and a variable stress controller, wherein the Lyot filter consists of a polarization maintaining optical fiber with the length of 0.25 m and a polarizer with a high extinction ratio; the variable stress controller is connected with a section of polarization-maintaining tail fiber with the length of 0.05 m at the tail end of the polarization-maintaining optical fiber through a holder; the variable stress controller is used for continuously twisting and bending the polarization maintaining optical fiber; the distortion angle and the bending angle of the polarization-maintaining optical fiber are used for respectively controlling the central wavelength and the waveform left-right symmetry degree of an optical path passing through the polarization-maintaining optical fiber; the distortion angle and the bending angle of the polarization maintaining optical fiber are in linear relation with the driving current of the variable stress controller. According to the invention, spectral shape online correction of other optical paths such as fiber-optic gyroscopes can be realized.

A loop pigtail compensation method for a fiber-optic gyroscope, and a fiber length compensator. The fiber length compensator is fixed on a loop pigtail of the fiber-optic gyroscope, and the fiber length compensator includes a peripheral fiber loop and an expansion-and-contraction shaft core capable of realizing deformation of expanding and contracting; and upon detecting that there is a drift in an output of the fiber-optic gyroscope, a length of the peripheral fiber loop of the fiber length compensator is changed by adjusting a coefficient of linear expansion of the expansion-and-contraction shaft core of the fiber length compensator, so that the compensation for the loop pigtail of the fiber-optic gyroscope is realized, and the problem of low accuracy of online adjustment of the pigtail of the fiber-optic gyroscope is solved.

The invention belongs to the field of quantum precision sensing and measurement, and provides an optical fiber collimator applied to an atom magnetometer and an assembly method of the optical fiber collimator. The optical fiber collimator applied to the atom magnetometer comprises a polarization-maintaining optical fiber pigtail, a lens, a laser homogenizing wave plate, a circular polarization polarizer, a diaphragm and a sleeve, the lens is arranged on the downstream of the polarization-maintaining optical fiber pigtail, the lens is an aspheric lens, the laser homogenizing wave plate is provided with a homogenizing area, the polarization axis of the circular polarization polarizer coincides with the polarization axis of emergent light of the lens, and the diaphragm is arranged in the sleeve. The light source is used for generating circularly polarized light, the diaphragm is used for limiting the shape of an emergent light spot, and the sleeve is used for installing the polarization-maintaining optical fiber pigtail, the lens, the laser homogenizing wave plate, the circular polarization polarizer and the diaphragm. The atomic polarization uniformity can be effectively improved, the response signal of the atom magnetometer is improved, the signal-to-noise ratio of the quantum sensor system is improved, and the quantum sensor system is suitable for being used in a high-precision measurement scene.

The utility model discloses a light source module and a projection display device. The light source module comprises a laser light source; the coupling lens is arranged on an emergent light path of the laser light source, and the light incident side and / or the light emergent side of the coupling lens are / is provided with an aperture diaphragm; and the tail fiber is arranged on an emergent light path of the coupling lens, light emitted by the laser light source is coupled into the tail fiber through the coupling lens, and by setting the type of the tail fiber and designing an optical fiber coupling end face, echoes and stray light generated at the optical fiber coupling end face are reduced, the influence of the echoes and the stray light on output of the laser is weakened and avoided, and the imaging quality is improved.

A multi-fiber cable assembly includes a pigtail segments spliced to a trunk segment using multiple mass fusion splices. The splices are disposed at axially spaced positions within a hollow, flexible conduit. Fibers of the trunk segment are axially fixed at a first demarcation region disposed at the first end of the conduit. Fibers of the pigtail segments are axially fixed at a separate, second demarcation region disposed at the second end of the conduit.

The present invention discloses an optical fiber system and method for online testing of free water content in aviation fuel. The testing system includes a single-wavelength laser light source with multiple wavelengths, a first optical fiber flange, a hollow-core optical fiber liquid sample cell, a second optical fiber flange, a photoelectric probe with a pigtail, a microfluidic sampling pump, a liquid sample outlet, a constant temperature device, and a host computer. The present invention online measures the dependence of the Mie scattering loss of free water microspheres suspended in a hollow-core optical fiber liquid sample cell filled with aviation fuel on different laser wavelengths to calculate the radius of the free water microspheres in the aviation fuel and the number of free water microspheres per unit volume, thereby measuring the free water content in the aviation fuel. The optical fiber testing system has a compact structure, small size, light weight, and requires a small sampling volume. It can quickly and accurately test free water content and is suitable for real-time online monitoring of trace free water content in aviation fuel.

This invention discloses a 9-cavity mode-locked fiber laser with adjustable parameters based on a liquid crystal phase delay device, belonging to the field of mode-locked laser technology. It includes, along the optical path, a mirror, a polarizing beam splitter prism, a liquid crystal phase delay adjustable waveplate, a Faraday rotator, a liquid crystal phase delay adjustable waveplate, and a polarizing beam splitter prism. A fiber optic loop is provided on one side of the polarizing beam splitter prism, comprising, in sequence, a fiber collimator, a gain fiber, a wavelength division multiplexing-splitter mixer, and a fiber collimator prism. The slow axis of the fiber collimator prism's pigtail is aligned horizontally with the polarizing beam splitter prism prism 2; the slow axis of the fiber collimator prism 2's pigtail is aligned vertically with the polarizing beam splitter prism prism 2. A pump semiconductor laser is connected to the pump input of the wavelength division multiplexing-splitter mixer, and an FCAPC jumper is connected to the signal output of the wavelength division multiplexing-splitter mixer. This enables continuous and rapid adjustment of the laser parameters.

A bend-insensitive multimode optical fiber attenuation test device and method includes a light source, a single-mode or few-mode injection pigtail, a coupling injection device, an optical power detector, and a beam quality analyzer. The light source is connected to the coupling injection device via the single-mode or few-mode injection pigtail, and the coupling injection device and the optical power detector are connected to the multimode optical fiber under test. The beam quality analyzer is connected to the multimode optical fiber under test via a bare fiber adapter. The test device provided by the present invention uses a high-precision five-dimensional adjustment frame to adjust the injection light angle and thus the injection light mode, achieving high flexibility in controlling the target mode during attenuation testing.

The invention discloses a light source module and a projection display device. The light source module comprises a laser light source; the coupling lens is arranged on an emergent light path of the laser light source, and the light incident side and / or the light emergent side of the coupling lens are / is provided with an aperture diaphragm; and the tail fiber is arranged on an emergent light path of the coupling lens, light emitted by the laser light source is coupled into the tail fiber through the coupling lens, and by setting the type of the tail fiber and designing an optical fiber coupling end face, echoes and stray light generated at the optical fiber coupling end face are reduced, the influence of the echoes and the stray light on output of the laser is weakened and avoided, and the imaging quality is improved.

The corn fruit biological information detection device comprises a bottom plate, a waste liquid collection box and a U-shaped detection seat, a detection cavity is formed in an inner cavity of the U-shaped detection seat, a detection optical fiber is arranged on the inner wall of the detection cavity, and a light source, a spectrograph, a single-mode tail fiber and a multi-mode optical fiber are arranged at the two ends of the detection optical fiber respectively. Side frames are installed at the top ends of the outer walls of the two sides of the U-shaped detection base, a top beam is installed between the adjacent side frames, a controller and a flushing mechanism are arranged on the top beam, the flushing mechanism comprises a U-shaped walking frame, a spray head is installed at the bottom of the U-shaped walking frame, and two sets of tooth-shaped plugging plates are arranged at the bottom of the detection cavity; through the action of the light source, the single-mode tail fiber, the spectrograph, the multimode optical fiber and the detection optical fiber, rapid detection of corn fruit biological information is achieved, rapid washing of the detection cavity after detection is completed is achieved, the situation that residual corn fruit extracting solution affects the accuracy of next-time biological information detection is avoided, and the detection efficiency is improved.

The present invention provides a low-power RFID group scanning system based on energy collection and backscattering technology, which relates to the technical field of Internet of Things; the RFID tag in the system integrates a radio frequency receiving component, a photovoltaic component and a thermoelectric component, and is mainly used to collect radio frequency energy in the environment, and is supplemented by other energy sources, and energy conversion and storage are performed through a maximum power point tracking algorithm to ensure the stability of tag power supply; the RFID reader uses undersampling and sparse reconstruction technology to parse backscattered signals, and supports efficient identification and information extraction of multiple tags; the data management unit is responsible for storing and managing RFID tag information, and establishing a logical association between an optical fiber port and a pigtail; the system has efficient energy utilization capability, intelligent signal processing and a highly adaptable dynamic adjustment mechanism, and is widely applicable to optical fiber network management and low-power Internet of Things application scenarios.

A telecommunications rack system includes a first element defining splice locations and a second element defining adapters for receiving connectorized cabling, wherein the first and second elements are positioned on the same rack. A first end of a fiber optic pigtail is spliced at and extends from the splice locations of the first element. A second end is connectorized with a fiber optic connector that is coupled to an adapter of the second element. The pigtail extends between the first and second elements. A cable manager is removably mounted at the side of at least one of the first and second elements. The cable manager defines a U-shaped passage including ends that open toward one end of the elements and a closed end opposite the open ends. The U-shaped passage defines cable pass-throughs adjacent the closed end for transitioning cables from inside the U-shaped passage to an exterior thereof, wherein the connectorized pigtail is passed at least through a portion of the U-shaped passage and out the cable pass-through going from the first element to the second element.

The utility model discloses an adaptive tool for automatic dispensing and bonding of an optical fiber ring, which comprises a tool main body, an optical fiber ring piece, a fiber climbing step and a mounting seat, the tool main body is convexly provided with a mounting ring column, the optical fiber ring piece is arranged on the mounting ring column, the tool main body is provided with a tail fiber ring groove along the peripheral side of the mounting ring column, and the tail fiber ring groove is arranged on the mounting ring column. A plurality of positioning columns are further arranged between the tail fiber ring groove and the mounting ring column, avoiding arc grooves are further formed in the tool body, the fiber climbing steps are symmetrically arranged on any two adjacent avoiding arc grooves, fiber outlet steps are arranged at the end, close to the tool body, of the optical fiber ring piece in a protruding mode, and fiber outlet avoiding grooves corresponding to the fiber outlet steps are formed in the mounting ring column. And the mounting seat is embedded and mounted on the optical fiber ring piece. According to the utility model, the tail fiber ring groove and the avoiding arc groove are introduced and matched with the fiber climbing step, so that the damage risk of the tail fiber in the automatic bonding process is obviously reduced, and meanwhile, the mounting seat is tightly bonded with the optical fiber ring piece, so that the bonding effect is ensured, and the rejection rate and the production cost are effectively reduced.

The present disclosure provides an optical integrated device and an optical time domain reflectometer. The optical integrated device includes: a packaging outer shell, a first collimator, an optical splitting device, a circulator assembly and a second collimator. The optical splitting device is provided close to the first collimator, is used to reflect a part of the detecting light from the first pigtail and couple the part of the detecting light to the third pigtail, and allows the other part of the detecting light to pass through the optical splitting device. The circulator assembly is provided close to the optical splitting device, the circulator assembly is used to couple the detecting light passing through the optical splitting device to the second pigtail, and couple the detecting light returned from the second pigtail to the third pigtail. The optical integrated device integrates the optical splitting device and the circulator assembly to be packaged in one packaging outer shell, the number of components of the optical time domain reflectometer may be reduced, the number of optical fiber fusion joints may be reduced, a space may be saved and performance may be promoted.

The utility model belongs to the technical field of optical fibers, and particularly relates to a portable light splitting polarization module for optical fiber ring testing, which comprises a light splitting layer and a polarization layer, the polarization layer is detachably mounted on the upper surface of the light splitting layer, the upper surface of the light splitting layer is provided with a first tail fiber coiling groove, and the bottom of the first tail fiber coiling groove is provided with a first device groove. A plurality of light splitting devices are placed in the first device groove, and an input fiber inlet is formed in the peripheral side of the first tail fiber winding groove; a second tail fiber coiling groove is formed in the upper surface of the polarizing layer, a second device groove is formed in the bottom of the second tail fiber coiling groove, a plurality of polarizing devices are placed in the second device groove, an output fiber outlet is formed in the peripheral side of the second tail fiber coiling groove, a fiber climbing channel is formed in the bottom of the second tail fiber coiling groove, and the first tail fiber coiling groove and the second tail fiber coiling groove are communicated through the fiber climbing channel. The device has the advantages of being convenient to carry and easy to operate.

1. The name of the design product: doll (Huihui). 2. The use of the design product: for dolls, ornaments, hand-made, etc. for entertainment. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best indicates the design points: perspective drawing.

This invention relates to fiber optic ring assemblies, specifically to a fiber optic ring assembly and a sealing process method to improve its long-term stability. This addresses the technical problems of existing fiber optic ring assemblies, such as the inability to guarantee the accuracy performance of the fiber optic ring when exposed to air, poor sealing performance at the small holes in the fiber optic ring shell, and slippage of the fiber optic ring and pigtails from the fiber optic ring shell due to weak adhesive. The invention includes a fiber optic ring shell and a fiber optic ring. The fiber optic ring shell includes a fiber optic ring frame and a cover plate, which are sealed together. The fiber optic ring is installed within the cavity formed by the fiber optic ring frame and the cover plate. The invention also includes a flexible absorbent material covering the fiber optic ring. The flexible absorbent material fills the space within the cavity of the fiber optic ring shell, excluding the space occupied by the fiber optic ring. A channel is provided on the fiber optic ring shell connecting the cavity to the outside. At least one pigtail of the fiber optic ring extends from this channel. The channel is sealed.

The invention discloses a pumping source which comprises a pumping source component which comprises a module assembly and a tail fiber, and the module assembly is used for generating laser and transmitting the laser to the tail fiber; the packaging assembly comprises a housing and a radiator, the pumping source component is arranged at the heat exchange end of the radiator, the radiator is used for dissipating heat of the pumping source component, and the housing and the radiator are matched to form a packaging shell used for packaging the pumping source component; and the air guide assembly is arranged on the packaging assembly and is used for guiding the air flow generated by the radiator to the radiating end of the radiator in an inclined direction. Compared with the prior art, a metal tube shell is omitted, the heat dissipation performance of the radiator can be improved on the basis of saving the cost, in addition, through the arrangement of the air guide assembly, heat can be comprehensively and evenly guided out of the radiator by multiple air flows at different inclination angles, and therefore the heat dissipation efficiency is further improved.

The invention provides a valve rod thrust detection method and system and an intelligent valve rod. At least one fiber bragg grating thrust sensor is fixed on the surface of the valve rod in the axial direction of the valve rod, the central wavelength of the at least one fiber bragg grating thrust sensor changes based on the axial strain of the valve rod, and a tail fiber of the at least one fiber bragg grating thrust sensor is connected with a fiber bragg grating demodulator. The fiber bragg grating demodulator is used for collecting a first central wavelength of the at least one fiber bragg grating thrust sensor; the method comprises the steps that thrust is output to the valve rod through an actuator, and the valve rod is driven to act; when the valve rod acts, acquiring a first central wavelength of the at least one fiber bragg grating thrust sensor acquired by a fiber bragg grating demodulator; and based on the relation between the offset of the first central wavelength and the thrust, the thrust borne by the valve rod is determined according to the obtained first central wavelength. According to the scheme, the thrust of the valve rod can be automatically detected.

The utility model relates to a miniaturized 1×1 port ultra-narrowband bandpass filter device, one end of which is a first single fiber collimator, and the other end is a second single fiber collimator and an ultra-narrowband bandpass filter assembly, wherein the first single fiber collimator comprises a single fiber pigtail, a first radial gradient self-focusing lens and a first glass tube, and the single fiber pigtail and the first radial gradient self-focusing lens are fixed in the first glass tube; the second single fiber collimator and the ultra-narrowband bandpass filter assembly comprises a single fiber pigtail, a second radial gradient self-focusing lens, a small platform processed on an 8-degree polished surface of the second radial gradient self-focusing lens, the first glass tube, and an ultra-narrowband bandpass filter, the single fiber pigtail and the second radial gradient self-focusing lens of the second single fiber collimator and the ultra-narrowband bandpass filter assembly are fixed in the first glass tube, and the ultra-narrowband bandpass filter is installed and fixed on the plane end of the second radial gradient self-focusing lens. The miniaturized 1×1 port ultra-narrow bandpass filter device of the utility model has high coaxiality, strong linearity, compact size, and precise packaging, and can be widely used in the field of optical fiber communication.

This invention discloses a solid-core and hollow-core fiber conversion device, comprising: a dual-spherical lens, a glass tube, a single-mode solid-core fiber pigtail, and a hollow-core fiber pigtail; the dual-spherical lens includes a first end spherical surface and a second end spherical surface, wherein the curvature of the first end spherical surface is less than the curvature of the second end spherical surface; the first end spherical surface of the dual-spherical lens is close to the single-mode solid-core fiber pigtail, and the second end spherical surface of the dual-spherical lens is close to the hollow-core fiber pigtail. Using this structure, the size of the light spot converged by the first end spherical surface is the same as the size of the light spot emitted by the hollow-core fiber pigtail, enabling the conversion of light between hollow-core and solid-core fibers. It also solves the problems of ultra-high loss and extremely low return loss caused by fusion splicing of solid-core and hollow-core fibers, and features a simple and compact structure, low cost, and excellent performance.