357 results about "Buffer (optical fiber)" patented technology

The invention discloses a kilometer deep well roadway toughness regulation and control supporting system and a dynamic design method, and belongs to the field of deep well roadway supporting. The supporting system comprises a multi-layer collaborative structure and an intelligent regulation and control module, the multi-layer collaborative structure sequentially comprises a shape memory alloy energy absorption layer used for resisting impact loads and a gradient pore foam metal buffer layer used for energy grading dissipation from inside to outside, and the multi-layer collaborative structure is connected with roadway surrounding rock in an anchoring mode through an anchor rod anchoring structure; the intelligent regulation and control module comprises a distributed optical fiber sensor array used for monitoring surrounding environment signals of surrounding rock in real time, an electrostriction driver used for regulating and controlling the rigidity of the multi-layer cooperative structure and a multi-channel data fusion terminal used for achieving underground and surface data transmission synchronization. By the adoption of the kilometer deep well roadway toughness regulation and control supporting system and the dynamic design method, the problems that a traditional supporting mode is too high in material rigidity, lacks dynamic regulation and control capacity and is insufficient in impact toughness can be solved.

The invention provides a corrosion-resistant composite cable and a preparation method thereof, the corrosion-resistant composite cable comprises a signal unit, an optical cable unit and a protection unit, the signal unit and the optical cable unit are coated with the protection unit, the signal unit comprises a silver-plated copper conductor, an insulating layer, a shielding layer and a sheath layer, and the silver-plated copper conductor is coated with the insulating layer. The optical cable unit comprises an optical fiber, a buffer tube and a filler; the protection unit comprises an inner sheath, a tensile layer, an anti-corrosion layer and an outer sheath. The corrosion-resistant composite cable has good corrosion resistance, can effectively resist corrosion of various chemical substances, prolongs the service life of the cable, reduces the fault risk caused by corrosion, and improves the stability and reliability of power transmission or signal transmission; under severe environment conditions, such as high humidity, high salinity and high alkalinity, a normal working state can still be kept, continuous and stable support is provided for related equipment or systems, and normal operation of the equipment or systems is guaranteed.

Consistent with the present disclosure, an encoder circuit is provided at a transmit side of an optical fiber link that maps an input sequence of bits of fixed length k a sequence of symbols of a codeword of length n, such that the symbols of the codeword define a predetermined transmission probability distribution. Preferably, each symbol of the codeword is generated during a corresponding clock cycle, such that after n clock cycles, a complete codeword corresponding to the input bit sequence is output. On a receive end of the link, a decoder is provided that outputs the k-bit sequence every n clock cycles. Accordingly, buffers need not be provided at the output of the encoder and the input of the decoder, such that processing of the input sequence, codewords, and output sequence may be achieved efficiently without large buffers and complicated circuitry. Moreover, the input sequence, with any binary alphabet may be matched to a desired output distribution with any arbitrary alphabet. Accordingly, probabilistic constellation shaping may be achieved over constellations of arbitrary size. In addition, relatively long codewords, may be encoded and decoded with the apparatus and method disclosed herein. Accordingly, for a fixed SNR a higher SE (more bits per symbol) can be achieved. Alternatively, for a fixed SE, a lower SNR may be sufficient. Moreover, the resulting SE may be finely tailored to a particular optical link SNR to provide data transmission rates that are higher than the low order modulation formats that would otherwise be employed for optical signals carried by such links.

The nonmetal composite pipeline comprises a main pipe, a heat preservation layer, a cushioning layer and an outer protection layer are sequentially arranged on the outer surface of the main pipe outwards, an optical fiber groove is formed in the inner surface of the heat preservation layer in the axis direction of the main pipe, an optical fiber monitoring strip is arranged in the optical fiber groove, and the optical fiber monitoring strip is formed by connecting a plurality of optical fiber sensors in series through optical fibers. The optical fiber sensor is connected with the data acquisition and processing unit through an optical fiber, the data acquisition and processing unit is wirelessly connected with the communication module, and the communication module is wirelessly connected with the remote monitoring center. The invention further discloses a preparation and monitoring method of the nonmetal composite pipeline based on optical fiber sensing. Through a multi-layer composite structure, the problems of large weight, easy corrosion and the like are solved, the optical fiber monitoring strips are integrated to sense multiple strain and pressure parameters in real time, and high-precision pipeline health monitoring is achieved in combination with remote monitoring.

The utility model discloses an optical fiber cutting and clamping jig. The optical fiber cutting and clamping jig comprises an optical fiber limiting and placing bottom plate, an overturning and buckling gland and a buffering and pressing mechanism, a profiling groove used for placing the main body shell is formed in the middle of the optical fiber limiting and placing bottom plate, and the overturning and buckling gland is rotationally connected with the optical fiber limiting and placing bottom plate. The buffer pressing mechanism is arranged on the overturning buckling pressing cover and corresponds to the clamping groove structure, the buffer pressing mechanism comprises a pressing block, an installation block and an elastic piece, when the overturning buckling pressing cover rotates relative to the optical fiber limiting placement bottom plate, the pressing block abuts against and presses an optical fiber insertion core located in the clamping groove structure, and the elastic piece abuts against the optical fiber insertion core located in the clamping groove structure. The installation block buffers stress in the rotation direction by extruding or stretching the elastic piece so that the position of the pressing block relative to the optical fiber ferrule is not changed, the situation that the optical fiber ferrule is driven by the stress in the rotation direction to generate dislocation deviation is avoided, and larger pressure can be applied to clamp the optical fiber ferrule.

The invention relates to the technical field of optical fiber communication, in particular to a thin-film lithium niobate electro-optical modulator of a stepped electrode, which comprises a substrate, a buffer layer, an optical waveguide, a metal electrode and a transition layer, the optical waveguide is an X-shaped or Y-shaped cutting LN film, a traditional ridge-shaped structure is adopted, the optical waveguide is bonded to the thick SiO2 buffer layer on the substrate, the film can be prepared through various technologies such as ion implantation, wafer bonding and hot slicing, and in order to improve the electro-optical overlapping coefficient and reduce light absorption loss, a silicon dioxide transition layer is used for connecting the metal electrode and the optical waveguide. The metal electrode is of a stepped structure, the electrode can effectively reduce electrical loss and obtain high bandwidth, and the electrode is used for generating an electric field in the aspect of photoelectric efficiency; the electric field is used for changing the functional characteristics of the thin-film lithium niobate layer and further changing the optical transmission characteristics of the waveguide, so that electro-optical modulation is realized. Therefore, the problem that an existing electro-optical modulator is low in modulation efficiency is solved.

The invention provides a synchronous communication device and method based on multiple coprocessors, equipment and a storage medium. The device comprises a main processor which is configured to send a communication instruction to a primary buffer; the cache controller is configured to distribute the communication instruction from the first-level cache to the first second-level cache and the second second-level cache; the first coprocessor is configured to read the communication instruction from the first second-level buffer and configure the communication instruction to the first terminal node; the second coprocessor is configured to read the communication instruction from the second secondary buffer and configure the communication instruction to a second terminal node; and the synchronous triggering module is configured to control the first terminal node and the second terminal node to perform synchronous communication according to the communication instruction to obtain a communication result. Therefore, the first coprocessor and the second coprocessor can simultaneously configure the corresponding terminal nodes, so that the instruction sending time is shortened, and optical fiber bus communication for spaceflight control can be accelerated through the multiple coprocessors.

The invention provides a heterogeneous integrated sub-wavelength structure end face coupler adaptive to a single-mode optical fiber and a preparation method of the heterogeneous integrated sub-wavelength structure end face coupler, and relates to the technical field of integrated optics. The coupler comprises a substrate, an insulating layer, a waveguide layer and a cladding from bottom to top. The waveguide layer comprises an upper lithium niobate ridge waveguide and a lower lithium niobate ridge waveguide, the lower waveguide is wider than the upper waveguide, and the upper waveguide is used for connecting an external waveguide; the heterogeneous integrated coupling region comprises a silicon nitride strip conical waveguide which forms directional coupling with the lower-layer lithium niobate waveguide, so that adiabatic transfer of a light field is realized; the sub-wavelength grating regulation and control region sequentially comprises a silicon nitride tapered waveguide and sub-wavelength grating combination section, a width gradually-changing grating section and an equal-width buffer grating section. The whole structure is symmetrical about the central axis. Through the multi-section adiabatic transformation and heterogeneous integration design, efficient expansion of a mode field is achieved, the coupling efficiency with a single-mode fiber is improved, and the advantages of being insensitive to polarization, good in process compatibility and suitable for high-density integration are achieved.

Disclosed in the present invention is a radiation-insensitive single-mode optical fiber, comprising a core, a first cladding, and a second cladding which are sequentially arranged from inside to outside, or comprising a core, a first buffer layer, a first cladding, a second buffer layer, and a second cladding which are sequentially arranged from inside to outside. The core, the first buffer layer, the first cladding, the second buffer layer, and the second cladding are all made of quartz glass doped with a cerium element, an aluminum element, and a fluorine element. The contents of the cerium element, the aluminum element, and the fluorine element are constant in the radial directions of the core, the first cladding, and the second cladding, respectively, and linearly vary in the first buffer layer and the second buffer layer, respectively. In the present invention, by regulating and controlling the contents of the cerium element, the aluminum element, and the fluorine element in the core, the first cladding, and the second cladding of the optical fiber, the stress distribution of the optical fiber is optimized, the residual stress is reduced, and the generation of fatigue bonds and wire drawing defects in the optical fiber is reduced, thereby improving the radiation resistance of the optical fiber.

The embodiment of the invention provides a signal cable, a signal monitoring system and a signal monitoring method. The signal cable comprises a plurality of conductors, a plurality of insulators, an optical fiber sensing layer, a pressure-resistant buffer layer, a shielding layer and an outer sheath layer, wherein each conductor is wrapped with one insulator, and the plurality of insulators are included in the optical fiber sensing layer; a first single-mode optical fiber, a second single-mode optical fiber and a multimode optical fiber are arranged in the optical fiber sensing layer, and the first single-mode optical fiber, the second single-mode optical fiber and the multimode optical fiber are circumferentially arranged in the optical fiber sensing layer; the compression-resistant buffer layer is wrapped on the optical fiber sensing layer, the shielding layer is wrapped on the compression-resistant buffer layer, and the outer sheath layer is wrapped on the shielding layer. Through cooperation and distributed sensing of multiple optical fibers in the optical fiber sensing layer, the transmission precision and distance of cable signals are effectively improved, and the safety and reliability are improved.

The invention discloses a halogen-free low-smoke optical cable communication cable, and relates to the technical field of communication cables, the halogen-free low-smoke optical cable communication cable comprises an optical fiber assembly, a communication assembly is arranged on the outer surface of the optical fiber assembly, and a chemical protection assembly is arranged on the outer surface of the communication assembly. According to the halogen-free low-smoke optical cable communication cable, in order to enhance the mechanical strength of the cable, the protective sleeve can improve the impact resistance of the cable, the thin steel layer can provide mechanical strength for the cable, the armor layer on the outer layer is used for resisting external corrosion, and the smoke suppression layer additionally arranged between the armor layer and the thin steel layer can reduce smoke generated when the cable burns; the glass fiber layer is an important reinforcing and protecting structure in the cable, the buffer layer prevents the optical fibers from being broken and the conductors from being deformed, and when the cable is subjected to external impact force, lubricating oil stored in an oil tank flows into the surface of the armor layer and permeates into the outer surface of the thin steel layer through the smoke suppression layer. The cable has an effective protection effect on mechanical strength resistant components in the cable, and the outermost wear-resistant layer depends on certain rigidity and toughness.

The present disclosure provides a hybrid optical fiber comprising a hollow core fiber section having a first end and a second end, one or more end fiber sections coupled to at least one end of the hollow core fiber section, and optionally a buffer tube encapsulating at least the hollow core fiber section. A hybrid optical cable may include a sheathing and two or more such hybrid optical fibers. Methods may include fabricating hybrid optical fibers by coupling glass core fiber sections to hollow core fiber sections, winding on a reel, and testing. Another method may involve installing and coupling hybrid optical fibers based on inspection results. The hollow core fiber sections may comprise various designs including anti-resonant, photonic bandgap, or nested structures.

The utility model is applicable to the technical field of communication equipment, and provides a through-tube optical fiber connector, which comprises a connector body, an optical fiber component arranged in the connector body, a dust cap or an external adapter arranged at the front end of the connector body and surrounding the optical fiber component, and the optical fiber component comprises a ceramic ferrule, an optical fiber tail handle and a tail handle spring. The connector body is provided with an installation groove, one end of the tail handle spring abuts against the bottom of the installation groove, the other end of the tail handle spring abuts against the optical fiber tail handle, a fastening structure is arranged in the installation groove, the optical fiber tail handle is arranged between the fastening structure and the tail handle spring, and the ceramic ferrule extends out of the installation groove through the fastening structure and extends into the dustproof cap or the external adapter. The fastening structure and the tail handle spring act together to control the tail handle of the optical fiber to be always kept in a reasonable space, the tail handle spring provides buffer acting force outwards, the optical fiber is guaranteed not to be excessively pulled, the ceramic ferrule is guaranteed not to abut against the inner wall of the dustproof cap, and the effect of protecting the optical fiber and the ceramic ferrule is achieved.

The invention discloses an intelligent fireproof medium-voltage cable and a preparation method thereof. The intelligent fireproof medium-voltage cable comprises a main cable body, a temperature measurement layer and a sheath which are sequentially arranged from inside to outside, the main cable body comprises an insulated cable, a cooling metal tube, a filler and a flame-retardant buffer layer which are sequentially arranged from inside to outside, the insulated cable is formed by tightly wrapping a conductor, a composite insulating layer, a semi-conductive buffer layer and a metal shielding layer from inside to outside in sequence, and the cooling metal tube is arranged on the periphery of the metal shielding layer; the temperature measurement layer comprises a heat insulation layer, temperature measurement optical fiber units, a cooling metal tube and a buffer layer which are sequentially wrapped from inside to outside, each temperature measurement optical fiber unit comprises a temperature measurement optical fiber and a cooling metal tube, the plurality of temperature measurement optical fiber units are uniformly wrapped between the heat insulation layer and the buffer layer, and the temperature measurement layer is located between the main cable body and the sheath; the sheath comprises a metal sheath and an outer sheath which are successively wrapped from inside to outside. The temperature measuring optical fiber units independently arranged in the temperature measuring layer are convenient to install and maintain, and the uniformly distributed temperature measuring optical fiber units are low in false alarm rate.

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 provides a special-shaped conductor polypropylene insulation photoelectric composite cooling power cable, and relates to the technical field of special-shaped cables, the special-shaped conductor polypropylene insulation photoelectric composite cooling power cable comprises three wire cores which are circumferentially and uniformly arranged, each wire core comprises a special-shaped conductor, an insulation layer and a metal shielding layer from inside to outside in sequence, and temperature measurement optical fiber units are arranged in the centers of the inner sides of the three wire cores; a filling area, a buffer layer and a heat dissipation outer protective layer are sequentially coated on the outer sides of the three wire cores; a cooling channel tightly attached to every two adjacent wire cores is arranged between the two adjacent wire cores, and the cooling channel is covered with an inner reflecting cover. Through a special-shaped conductor pressing and splicing technology, the sectional area of the conductor is reduced while the electrical performance is ensured; recyclable polypropylene is adopted to replace a polyethylene insulation system, so that heat resistance, corrosion resistance and high mechanical strength are achieved; through combination of the optical fiber temperature measurement unit and a multi-stage heat dissipation structure with a built-in cooling channel / inner reflection cover / porous buffer layer / graphene protection layer, real-time monitoring and dynamic thermal regulation and control cooperative management of the temperature of the cable are realized.

The invention discloses a special optical cable, a preparation method and sensing equipment with the special optical cable, the special optical cable comprises an optical fiber body, a high-temperature-resistant coating layer, a primary buffer layer, a secondary buffer layer, a reinforcer layer and a sheath layer which are sequentially arranged from inside to outside, and the high-temperature-resistant coating layer comprises an inner layer, a transition layer and an outer layer which are sequentially arranged from inside to outside. By designing the transition layer, efficient combination of the inner layer and the outer layer is achieved, the layering problem is avoided, and the high temperature resistance, bending resistance, compression resistance and other performance of the optical cable are remarkably improved; the special optical cable has the advantages of light weight, high temperature resistance, fast heat conduction, strong electric field and strong magnetic field environment resistance, bending resistance, compression resistance, high heat sensitivity, high mechanical property, high wear resistance, flame retardance, radiation resistance, corrosion resistance and the like, and is suitable for being applied to structural health monitoring equipment with anti-electromagnetic interference. The temperature, vibration and other parameters of the surface structure of an object or a material are monitored and stored, and the system serves for structural health monitoring and data storage of an aircraft in a flight environment.

The utility model discloses an optical fiber patch cord detection device, which comprises an outer box and is characterized in that a mounting box is inserted in the outer box in a sliding manner, a plurality of buffer assemblies are mounted in the mounting box, and each buffer assembly comprises a sliding rail arranged in the mounting box. Four mounting blocks distributed at equal intervals are slidably connected into the sliding rail, a plurality of second damping rods are fixedly connected to the outer walls of the sides, close to each other, of the four mounting blocks, the multiple second damping rods are sleeved with second springs, and the ends, close to each other, of the multiple second damping rods are fixedly connected with a detection box; according to the utility model, the buffer assembly, the damping rod I and the spring I are arranged, so that the detection box can be effectively buffered when the device is collided by external forces in different directions, and the damage to the detection box when the detection box is subjected to the external forces is greatly reduced.

Optical fibers are disposed within v-grooves of an optical fiber attachment region of a photonic integrated chip (PIC). A structural adhesive is disposed over a first portion of the optical fibers within the optical fiber attachment region of the PIC without being disposed over a second portion of the optical fibers within the optical fiber attachment region of the PIC. An optical index matching adhesive is disposed over the second portion of the optical fibers within the optical fiber attachment region of the PIC. A buffer structure is disposed on the structural adhesive and the optical index matching adhesive as they are cured. The buffer structure is removed. The optical fibers, the structural adhesive, and the optical index matching adhesive have a collective vertical height above a top surface of the PIC that is less than a vertical height of flip-chip attachment structures on the top surface of the PIC.

The invention discloses an optical fiber main and standby non-inductive switching protection method based on an FPGA. The method comprises the following steps that S1, a fault detection module is installed; s2, setting a buffer area; s3, emergency switching: after the fault detection module triggers a switching mechanism triggering condition, starting a switching mechanism, immediately adjusting output by the FPGA control unit, and switching to a standby channel to continue to receive the video data; s4, synchronization and recovery: after the switching is completed, the FPGA control unit keeps the synchronization and integrity of the video data through the technical means of timestamps and frame counting; and S5, data decoding and displaying: decoding the received data, and displaying the decoded data on a front-end display screen through an HDMI (High Definition Multimedia Interface). According to the application, the fault detection module and the FPGA control unit are arranged, so that the state of the data transmission channel is detected at any time, and after the switching condition is triggered, the transmission channel can be replaced in real time, and the problems of black screen, splash screen and the like are avoided.

The invention relates to the technical field of cables, in particular to a strong-acid-resistant and high-temperature-resistant silicone rubber cable and a processing technology thereof.The strong-acid-resistant and high-temperature-resistant silicone rubber cable sequentially comprises a multi-core insulating wire core, a filling layer, a cabling cable core wrapping tape, a shielding layer, an optical fiber unit, a buffer layer, a fluorocarbon protective layer and a corrosion-resistant and high-temperature-resistant sheath layer from inside to outside. Through the multi-layer protection design of the conductor anticorrosion priming coat, the insulating layer fluorosilicone resin protection layer, the filling layer-wrapping tape-buffer layer ceramic silicone rubber synergistic protection, the hydrophobic anti-permeation interlayer and the sheath layer acid-resistant filler, a compact acid-resistant protection system is formed, the cable is soaked in sulfuric acid / hydrochloric acid with the concentration of 50% and the temperature of 250 DEG C for 720 h, and the cable has the good anti-corrosion performance. The sheath layer and the wrapping tape do not crack, swell or fall off, the insulation performance is not obviously reduced, the problem that an existing cable is prone to aging and damage under strong acid is solved, double corrosion prevention of the conductor is achieved, and strong acid corrosion is thoroughly avoided.

The invention discloses a high-flame-retardant temperature-resistant corrosion-resistant optical fiber composite cable and a preparation method thereof, and belongs to the technical field of cable manufacturing, and the high-flame-retardant temperature-resistant corrosion-resistant optical fiber composite cable sequentially comprises an optical fiber unit, a conductor layer, an insulating layer, a shielding layer, a corrosion-resistant layer and a sheath layer from inside to outside. The optical fiber unit adopts a ceramic silicone rubber buffer layer; the conductor layer is a nickel-plated copper alloy stranded wire, and the oxidation resistance is enhanced through nano titanium dioxide sol treatment; the insulating layer is of a three-layer co-extrusion structure; the shielding layer adopts an aluminum-plastic composite belt and tinned copper wire braided composite structure; the anti-corrosion layer is a polytetrafluoroethylene film subjected to plasma treatment; the sheath layer is made of two-component ceramic silicone rubber, is flexible after being vulcanized at normal temperature, and is converted into a ceramic body at high temperature. According to the optical fiber composite cable, through the collaborative design of a multi-layer structure, the performance of excellent continuous use stability, high salt mist environment corrosion resistance and the like is achieved, the optical fiber composite cable is suitable for high-temperature, corrosion, fire and other severe environments, and the safety and durability of the composite cable are remarkably improved.

The invention provides an STM32-based anaerobic fermentation biogas slurry near infrared transmission spectrum data on-line acquisition device. The device comprises a backwashing anti-blocking biogas slurry filtering system and an on-line liquid near infrared spectrum acquisition system, according to the system, a three-stage filtering mechanism is adopted, an STM32 microcontroller is taken as a core, a miniature optical fiber spectrometer and a halogen tungsten lamp light source are integrated to construct a compact transmission light path, and solid particles in biogas slurry are effectively removed by combining a backwashing anti-blocking T-shaped three-way filter, a double-buffer-bottle liquid level control mechanism and a PID liquid level control strategy; the cavitation phenomenon of a biogas slurry sampling pipeline is inhibited, the stability of sample conveying and the repeatability of spectrum collection are remarkably improved, and an efficient and portable online detection solution is provided for anaerobic fermentation process control; reliable hardware support is provided for application of a near infrared spectrum detection technology in a complex anaerobic fermentation environment.

The invention discloses a pressure sensor testing system and method, and belongs to the technical field of pressure sensing. The system comprises a pressure generation assembly, a buffer assembly and a test assembly, wherein the pressure generation assembly is used for providing initial high pressure; the buffer assembly is connected with the pressure generation assembly and the measurement assembly through an internal and external thread adapter, and provides stable stepping pressure for the measurement assembly by performing multi-stage buffer on initial pressure so as to realize test calibration of the optical fiber pressure sensor; the buffer assembly can prevent the to-be-tested sensor from being damaged by high-pressure impact, the whole system carries out pressure regulation and control by adjusting valves of the buffer assembly and the measuring assembly, pressure in the buffer chamber and the measuring chamber is monitored in real time, test calibration of the optical fiber pressure sensor under the condition that the sensor is effectively protected is achieved, and the test accuracy is improved. Meanwhile, the device has the advantages of being simple in structure and convenient to operate, and has good economic benefits and popularization value.

The utility model relates to an anti-fracture flexible optical fiber protective sleeve, which belongs to the technical field of protective sleeves, and comprises a wear-resistant sleeve, a connecting assembly is arranged at the end part of the wear-resistant sleeve, an optical fiber is arranged in the wear-resistant sleeve, a buffer assembly is fixedly connected in the wear-resistant sleeve, and the buffer assembly is fixedly connected with the wear-resistant sleeve. A protection assembly is fixedly connected into the wear-resisting sleeve, a hollow spring is fixedly connected into the wear-resisting sleeve, and the hollow spring is arranged between the buffering assembly and the protection assembly. According to the utility model, the rubber ball, the hollow spring and the protective ring are used in cooperation, and when an optical fiber encounters a corner part in the installation process, extrusion force generated by bending of the optical fiber at the corner part can be absorbed by using deformation of the rubber ball, deformation of the hollow spring and deformation support of the protective ring; the optical fiber is prevented from being broken when being bent at the corner, normal signal transmission of the optical fiber is ensured, and the service life of the optical fiber is prolonged.

The utility model relates to a bending-resistant and low-temperature-resistant plastic optical fiber cable, which comprises a stretch-resistant wire core, a plurality of optical fiber wire cores are fixed on the outer surface of the stretch-resistant wire core, and a protection mechanism for improving the protection capability of the optical fiber wire cores is arranged on the outer side of the optical fiber wire cores; the protection mechanism comprises an inner protection layer arranged on the outer side of the optical fiber cable core, a buffer layer is arranged on the outer side of the inner protection layer, a waterproof layer is arranged on the outer side of the buffer layer, a low-temperature-resistant layer is arranged on the outer side of the waterproof layer, and a tensile layer is arranged on the outer side of the low-temperature-resistant layer. According to the bending-resistant and low-temperature-resistant plastic optical fiber cable, the protection mechanisms are arranged on the outer surfaces of the tensile wire cores and the optical fiber wire cores, so that the plastic optical fiber cable has the functions of buffer protection, water resistance, low temperature resistance, tensile resistance, corrosion resistance and wear resistance, and the service life of the plastic optical fiber cable is protected; and the influence on the use experience of a user caused by signal attenuation at low temperature is avoided.

In one embodiment, a method of preparing an optical cable includes stripping a jacket of the optical cable to expose a buffer tube and one or more strength members, trimming the one or more strength members to a first distance d1 from an end of the jacket, trimming the buffer tube to a second distance d2 from an end of the one or more strength members to expose a plurality of optical fibers, grouping the plurality of optical fibers, applying a heat shrink tube over the buffer tube, applying heat to the heat shrink tube, applying adhesive to a first end and a second end of the heat shrink tube, and curing the adhesive.

A low-loss, high-strength specialty optical fiber comprises a fiber core, a cladding disposed on the surface of the fiber core, and a coating layer covering the cladding. A base protective layer is fixedly sleeved around the circumference of the coating layer. A plurality of reinforcing protection strips uniformly distributed along the circumference of the fiber core are fixedly connected to the circumference of the base protective layer. The reinforcing protection strips are parallel to the fiber core, and a deformation space is formed between two adjacent reinforcing protection strips. A ring surrounds all the reinforcing protection strips. A plurality of buffer components are fixedly connected to the inner sidewall of the ring. The buffer components extend into the deformation space in a one-to-one correspondence. The present invention provides a low-loss, high-strength specialty optical fiber with higher strength and impact resistance, and can avoid localized micro-bending and loss.

The invention discloses a cone-ball coupled cavity photoacoustic gas sensor for detecting acetylene dissolved in transformer oil, relates to the field of testing or analyzing materials by using an optical means, and solves the problem that miniaturization and high sensitivity of an existing photoacoustic sensor are difficult to consider at the same time. An optical fiber collimator is arranged at one end of the shell, a sonic sensor is arranged at the other end of the shell, a buffer cavity, a first resonant cavity and a second resonant cavity are sequentially arranged in the shell between the optical fiber collimator and the sonic sensor, the end of the optical fiber collimator is located in the buffer cavity, and the center lines of the optical fiber collimator, the buffer cavity, the resonant cavities and the sonic sensor coincide. The buffer cavity is cylindrical, an air inlet and an air outlet are formed in the side wall of the buffer cavity, the first resonant cavity is in a circular truncated cone shape, and the second resonant cavity is in a segment shape. The buffer cavity, the first resonant cavity and the second resonant cavity are coupled to form a cylindrical-conical-spherical coupled cavity, so that limitation and focusing of acoustic energy are realized, and the amplitude of a photoacoustic signal is enhanced.

The present disclosure provides a micro sheath buffer tube with rollable optical fiber ribbons for optical fiber cable to reduce the overall cable diameter. The buffer tube indicates one or more subunits, a micro sheath layer and a plurality of water swellable yarns. The one or more subunits encloses a plurality of optical fiber ribbons. Each optical fiber ribbon of the plurality of optical fiber ribbons includes 12 optical fibers. Further, each of a plurality of optical fibers is a colored optical fiber. In addition, the micro sheath layer surrounds the one or more subunits. Furthermore, the one or more subunits has a coating layer of low smoke zero halogen material.