79results about How to "Guarantee the quality of signal transmission" patented technology

The invention relates to a flexible substrate package-based shielding structure and a manufacturing process thereof. The shielding structure comprises a flexible substrate which is coated on a component, wherein a potting adhesive is filled between the flexible substrate and the component; at least one shielding layer is coated on the flexible substrate; the shielding layer is grounded or connected with a power supply; a plurality of packaging pins are arranged on an outer surface of the flexible substrate with the shielding layer; the packaging pins are electrically connected with the flexible substrate; and the flexible substrate is interconnected with a printed circuit board through the packaging pins. For the flexible substrate package-based shielding structure, the manufacturing process is basically mature, the packaging weight is light, and the sensitivity of a miniature packaging system can be effectively improved.

The invention relates to a base station working frequency point switching method and device. Whether a current working frequency point is interfered or not is detected by detection on whether a signal to noise ratio of the current working frequency point is larger than a preset threshold value or not. When the signal to noise ratio is not larger than the preset threshold value, the current working frequency point is interfered, and the current working frequency point needs to be switched at the moment in order to avoid influence on data transmission. Moreover, the higher the signal to noise ratio is, the higher the signal transmission quality is. When the current working frequency pint needs to be switched, a current working frequency point of a local base station is switched to a working frequency point of which the signal to noise ratio is larger than the preset threshold value and maximum in each network base station, namely, the current working frequency point is switched to a working frequency point which is free from interference and has highest signal transmission quality to avoid interference, so that the signal transmission quality is ensured.

The invention discloses a device and a method for impedance matching and bias compensation for difference transmission lines, wherein the device comprises a first transmission line connected with a first signal transmitting end and a first signal receiving end, a second transmission line connected with a second signal transmitting end and a second signal receiving end, a bias compensation circuit bridged over the two transmission lines, and an impedance matching circuit bridged over the two transmission lines and close to the signal sending end. The bias compensation circuit comprises a first resistor connected between an input voltage and the first transmission line, a second resistor connected between the first transmission line and the second transmission line, and a third resistor connected between the second transmission line and a ground wire; and the impedance matching circuit comprises a matching resistor and a matching capacitor which are connected together in series, wherein the matching resistor is connected with the first transmission line, and the matching capacitor is connected with the second transmission line. With the device and the method, the quality and the accuracy of signal transmission as well as the stability of data transmission of the difference transmission lines can be ensured with lower system power consumption.

The invention relates to a street lamp control concentrator based on a low voltage power line carrier communication technology. The street lamp control concentrator adopts embedded design and integrates the functions of an embedding microcontroller technology, a power line carrier technology, a GPRS (general packet radio service) wireless communication technology and the like. The street lamp control concentrator can be used for receiving a control instruction sent by a management center through a GPRS communication module or an Ethernet communication module, respectively realizing three-phase street lamp control through three single-phase power line carrier modules, and returning the data replied by a street lamp to the management center through the GPRS communication module or the Ethernet communication module; the three single-phase power line carrier modules have the function of power fault detection, thereby realizing three-phase electrical phase loss detection; and the phase loss information can be sent to the management center timely through the GPRS or Ethernet communication way, thus, the reliability of the downlink communication of the concentrator and a street lamp control system is enhanced. The concentrator provided by the invention is simple in operation, convenient in use, and has widely practical value and application prospect in the technical field of power system street lamp control.

The invention relates to an optical fiber connector and an optical fiber connector assembly using the optical fiber connector. The optical fiber connector comprises a pin component, the front end of which is an insertion end. The pin component comprises a pin holder provided with a pin. The pin holder is rotatably sleeved with a connection nut in screw cooperation with an external thread at the insertion end of a housing of a corresponding adapter connector so as to enable the pin to be in rigid butting with an adapter pin of the adapter connector. The pin holder is provided with an anti-dropping structure for being in limitation cooperation with the connection nut to stop the connection nut to get out of the pin holder along the axial direction. The invention provides an optical fiber connector which is strong in tension resistance capability.

The embodiment of the invention provides a base station and a signal transmission method based on spectrum sensing technology. The method comprises the steps that each base station applies the spectrum sensing technology to measure noise power ratios of uplink signals of all authorized frequency points within a measurement cell when each detection period reaches; if it is detected that the noise power ratios of N frequency points in continuous M frequency points are greater than a threshold, the base station broadcasts blocking information on downlink channels of the M frequency points for indicating the terminal that the transmission frequency points of the blocking information send a pause signal; and then, the base station pauses the transmission of the signals of the M frequency points. By adopting the base station and the signal transmission method provided by the invention, the utilization rate of spectrum resources of a wireless communication system of the industry can be improved, the interference frequency band is evaded to guarantee the communication quality, and the reliability of the system is improved.

The invention discloses a rigid-flex combination board routing structure and a mobile terminal. The rigid-flex combination board routing structure comprises a wiring layer; a signal module and a connecting module, which are disposed on the wiring layer. The rigid-flex combination board routing structure comprises a first shielding cover and a second shielding cover. The first shielding cover is disposed on the signal module in a covered manner, and is provided with a first routing hole. The second shielding cover is disposed on the connecting module, and is provided with a second routing hole in a covered manner. The wire of the signal module is led out from the first routing hole, and is led in the second routing hole, and is electrically connected with the connecting module. The rigid-flex combination board routing structure and the mobile terminal are advantageous in that the first shielding cover is provided with the first routing hole, and the second shielding cover is provided with the second routing hole, and the wire can be led out by using the first routing hole, and is connected with the connecting module by the second routing hole, and therefore the signal transmission between different modules can be realized; and the wire passes through the first routing hole and the second routing hole during the routing process, and therefore the wire passing holes are not required to be arranged in the wiring layer, and therefore the signal transmission quality of the rigid-flex combination board can be guaranteed.

The invention provides an audio signal switching device. The device comprises a first interface, a second interface, an audio signal amplification circuit and an impedance circuit; the first interface comprises an audio signal receiving pin, a microphone pin and a ground pin; the second interface comprises an audio signal output pin; the audio signal amplification circuit is used for amplifying an audio signal received by the audio signal receiving pin and outputting the audio signal to the audio signal output pin; the audio signal received by the audio signal receiving pin flows to the microphone pin or the ground pin by an impedance equivalent part of the audio signal amplification circuit; and the impedance circuit is coupled between the microphone pin and the ground pin. According to the audio signal switching device disclosed by the invention, a line sequence of the microphone pin and the ground pin of an audio plug of the switching device can be detected whether to be the same with a line sequence of a detection. The invention also provides an electronic signing tool, the detection device and an interface detection system of the audio signal switching device.

The invention relates to a sealed optical fiber connector comprising optical contact elements and a housing. Mounting holes extending from the left to right are formed in the housing; and the optical contact elements are assembled into the mounting holes in a guiding moving mode along the left-right direction. A left blocking structure for limiting the optical contact elements to a limit for left movement is arranged on the housing. An optical fiber penetrates the mounting holes and includes a sealing segment cooperating with the mounting holes by a sealing structure and a bendable segment that is located at the left side of the sealing segment and is connected with the optical contact elements and can be bent under the acting force towards the right. Besides, a right blocking structure that is used for limiting the optical contact elements to a limit for right movement is arranged on the housing. The provided sealed optical fiber connector not only can be sealed but also can float axially.

The invention discloses an electric plug connector female seat and a wire clamping device on the electric plug connector female seat. The electric plug connector female seat includes a plug connectorshell which is internally provided with a direct pressure type insertion core, a PCB circuit board, a terminal seat, a wire bonding cover and a cable manager in sequence. The front surface of the PCBis connected with a first group of connecting elements on the direct pressure type insertion core, the back surface of the PCB is provided with a second group of connecting elements connected with theterminal seat, and the wire bonding cover and the cable manager are clamped and locked on the plug connector shell; the wire bonding cover is provided with a pressing inclined surface; and a female seat upper cover pivoted on the plug connector shell is provided with a pressing bevel edge corresponding to the pressing inclined surface. According to the electric plug connector female seat, the pressing inclined surface is additionally arranged on the wiring cover, so that the placement stability of the wiring cover is enhanced, and a cable in the clamping channel does not deviate and shake when the electric plug connector female seat is used, so that good and stable contact points of a wire group and a second group of connecting elements in the clamping groove are ensured, and the stability of data transmission is ensured.

The invention relates to an RCA plug, which comprises a lotus terminal, a center terminal, an insulating body and a cable, wherein the insulating body is used for fixing the lotus terminal and the center terminal; the lotus terminal comprises an external contact part and a first bonding pad; the external contact part is in a lotus form; the first bonding pad extends backwards; the center terminal comprises an internal contact part and a second bonding pad; the internal contact part is located at the inner side of the external contact part; the second bonding pad extends backwards; the first bonding pad and the second bonding pad are welded with the cable respectively; and the first bonding pad and the second bonding pad are partitioned on the left and right and are located on the same horizontal plane. The welding procedure of the cable is simple; the production efficiency is improved; the capacity is improved; the cost is reduced; welding is fast and convenient; the signal transmission quality is ensured; meanwhile, the binding force is improved; and the cable is prevented from falling off.

The invention relates to a circuit board, a preparation method thereof and a display panel. The circuit board comprises an insulating layer, a reference layer and a signal transmission layer, wherein the insulating layer comprises a first surface and a second surface which are opposite to each other; the reference layer is arranged on one side of the first surface, the reference layer comprises a latticed conductor formed by a plurality of first lattice units, and the first lattice units are symmetrical structure units with a first symmetry axis; the signal transmission layer is arranged on one side of the second surface, the signal transmission layer comprises a plurality of groups of differential line pairs, each group of differential line pairs comprises two differential lines parallel to the first symmetric axis, and the two differential lines are symmetric about the orthographic projection of part of the first symmetric axis on the signal transmission layer. The two differential lines of each group of differential line pairs of the circuit board are symmetrically distributed relative to the corresponding first symmetric axis, so the impedance consistency of the differential lines is ensured, the noise of the differential lines during signal uploading is reduced, and the signal transmission quality is further ensured.

The invention discloses a fireproof ultraviolet-ray-resistant multi-core optical cable which relates to the technical field of fibers and optical cables. The multi-core optical cable comprises two optical cable cores and two carbon fiber composite core rods at the inner part, an outer shielding layer and an outer insulating layer arranged outside. A metal pipe, a fiber sleeve and a metal woven netare arranged between the outer insulating layer and the outer shielding layer. The outer insulating layer comprises a first polytetrafluoroethylene layer, a ceramic silicon rubber layer and high-flame-retardance halogen-free polyethylene layer which are successively arranged from inside to outside. An inner protecting layer is arranged outside the optical fiber cores and the carbon fiber composite core rods. The inner protecting layer comprises a second polytetrafluoroethylene layer, a silicon nitride ceramic layer, an inner shielding layer and a low-flame-retardance halogen-free polyethylenelayer which are successively arranged from inside to outside. An optical cable filler is arranged between the low-flame-retardance halogen-free polyethylene layer and the outer shielding layer. The fireproof ultraviolet-ray-resistant multi-core optical cable has advantages of excellent fireproof performance, excellent flame retardance, excellent ultraviolet ray resistance, stable integral structure and effective service life prolonging.

The embodiment of the invention discloses a service data transmission method and device based on electric power Internet of Things system change. According to the technical scheme provided by the embodiment of the invention, each intelligent electric meter in the electric meter group skips service data to the main node at the corresponding data skipping link, and the main node transmits the service data to the data management node; and when the data management node detects that the new electric meter is accessed to the corresponding electric meter group, determining a data jump transmission object of the new electric meter, modifying the corresponding data jump transmission link, sending the modified data jump transmission link to the new electric meter and each intelligent electric meter of the corresponding electric meter group, and when the corresponding intelligent electric meter is detected to be replaced, modifying the corresponding data jump transmission link based on the newly replaced intelligent electric meter and updating the data jump transmission link to each corresponding intelligent electric meter. By adopting the technical means, the transmission data can be summarized based on the data skip link, the signal transmission efficiency is improved, and the signal transmission quality is guaranteed. And signal transmission mode setting during system change is facilitated.

The invention relates to a reinforced copper-clad steel signal cable. The reinforced copper-clad steel signal cable comprises three copper-clad steel wires and a hard outer sheath wrapped at the outside of the three copper-clad steel wires, wherein each copper-clad steel wire comprises a steel core and a copper layer on an outer surface of the steel core; a soft protective jacket covers an outer side of each copper-clad steel wire; a soft hair layer is arranged on an inner surface of the soft protective jacket; a shielding layer is arranged on an inner side of the hard outer sheath; the three copper-clad steel wires are distributed on the inner side of the hard outer sheath in a triangle, and a protection steel wire penetrates through the interior of the hard outer sheath between each two copper-clad steel wires and forms an outward protruding outer convex edge and an inward protruding inner fixing edge; and three fan-shaped supporting shielding bands are further arranged among the three copper-clad steel wires. The reinforced copper-clad steel signal cable provided by the invention not only avoids external interface, but also avoids the mutual interference among the single wires, enhances the strength of the cable, fixes the internal copper-clad steel wires, and avoids the surfaces of the copper-clad steel wires from being scratched by large amplitude swing, thereby guaranteeing the signal transmission quality.

The invention relates to the technical field of electronic equipment, and discloses a welding device and welding method for a printed board assembly based on inter-board vertical interconnection. The welding device comprises a positioning plate, a supporting plate, pins and screws, wherein the positioning plate is arranged above a printed board, the supporting plate is arranged below the printed board, the positioning plate, the supporting plate and the printed board are positioned through the pins, and the positioning plate, the supporting plate and the printed board are fixed together through the screws. According to the welding device and welding method, the welding device is adopted to mount and position a surface-mounted connector on the printed board assembly, the buckling deformation of the printed board in the welding process is controlled, accurate positioning and reliable welding of the surface-mounted connector based on inter-board vertical interconnection are realized, the problems of the position offset of the surface-mounted connector on the printed board assembly, the inclination and flotation of the connector and the buckling deformation of the printed board can be solved, and therefore the realizability and reliability of inter-board vertical interconnection are improved.

The invention relates to a burst optical signal receiving circuit and an optical module. A signal amplifier circuit is designed between an output end of a trans-impedance amplifier and input ends of limiting amplifiers in a burst circuit. The input end of the signal amplifier circuit is connected with the output end of the trans-impedance amplifier. The output end of the signal amplifier circuit is connected with the input ends of a first limiting amplifier and a second limiting amplifier. The input impedance of the signal amplifier circuit matches the output impedance of the trans-impedance amplifier. Signal implication can be carried out on 1G and 10G signals output by the trans-impedance amplifier without attenuation. The amplified signals are transmitted to 1G and 10G limiting amplifiers. After signal amplitudes are increased, a matching demand for the rear end impedance is reduced, so the condition that the signals output from the signal amplifier circuit to the limiting amplifiers are degraded in quality can be reduced, the small signal transmission quality from the trans-impedance amplifier to the limiting amplifiers can be ensured, and the sensitivity of the burst receiving circuit is improved.

The invention relates to a connection assembly for connecting a lead with a printed board and a fixing sleeve of the connection assembly. The connection assembly comprises lead terminals and the fixing sleeve, the front ends of the conductive pins include conductive pins respectively, the fixing sleeve comprises a sleeve-shaped body made of a metal material and extending along the front-and-back direction, the lead terminals are arranged in inner holes of the sleeve-shaped body respectively via an insulator, the inner hole of the sleeve-shaped body is provided with a shielding layer connecting structure which is fixedly connected with a shielding layer of the corresponding lead, and the front end of the sleeve-shaped body is provided with at least one reinforced grounding pin which is fixedly welded to the printed board. The connection assembly and the fixing sleeve thereof can process shielding wires and prevent the pins from bearing a force independently.

The invention relates to an information module with a shielding function in a network system, which comprises a base, a socket and a line pressing cover, wherein the socket is arranged on the base; the line pressing cover is arranged between the base and the socket; a through hole is arranged in the line pressing cover; a branching rib is arranged on the through hole and divides the through hole into two sub through holes; and data cables are respectively arranged in the two sub through holes in a penetrating manner and are connected with a socket. The information module with the shielding function is adopted, the branching rib on the through hole divides the through hole into the two sub through holes, and the data cables are respectively arranged in the two sub through holes in the penetrating manner, so that a space between each two cables is ensured, the crosstalk of signals is avoided; when the information module with the shielding function is arranged, the performances of the information module with the shielding function cannot be affected by a construction technology or a construction environment, and the signal transmission quality and the overall performance of the information module are ensured; and the information module with the shielding function in the network system has a simple structure and broader application range and is low in cost.

The invention discloses an orthogonal multi-carrier sending method, receiving method, device based on random phase rotation, and the sending method comprises the steps: obtaining a to-be-sent OFDM signal, carrying out the phase rotation of each subcarrier in each frame of data of the to-be-sent OFDM signal through employing a plurality of phase rotation values generated in advance, obtaining a phase-rotated OFDM signal, wherein the phase rotation value is randomly generated by using a secret key, and each subcarrier respectively and correspondingly uses different phase rotation values; and converting the phase-rotated OFDM signal into a signal in a required format, and sending out the signal. The OFDM signal can be prevented from being demodulated by a non-destination receiving end during transmission, and the method has the advantages of being simple in implementation method, low in complexity, high in transmission safety and reliability and the like.

This invention relates to one test data communication interface device based on FPGA infrared earth sensor, wherein, the communication interface device is for abnormal series data communication between infrared sensor and work engine machine by use of one non-standard series transmission communication device, wherein, the device comprises output interface circuit, input interface circuit, address selection circuit and FPGA chips.

The invention provides a portable sensor clamp applied to smart reinforcing steel bars. The portable sensor clamp comprises a pair of clamping components which are spliced together to form a through cylindrical structure, wherein a through part of the cylindrical structure is of a cylinder shape and is used for completely fitting to the reinforcing steel bars; the middle sectional shape of the cylindrical structure is a regular polygon; a piezoelectric ceramic sensor is directly clung to each edge of the regular polygon; the piezoelectric ceramic sensor motivates stress waves, the stress waves are transmitted to the fitted reinforcing steel bars through a clamp in charge of motivating a signal, and are then received by the piezoelectric ceramic sensor on a clamp in charge of receiving the signal, and the occurrence of damage is analyzed by waveform variation analysis. The portable sensor clamp provided by the invention is relatively small in size, and can be produced in batches; piezoelectric ceramic crystals are adhered inside the clamp in advance, such that not only can the influences, such as short-circuiting be avoided, but also the on-site manufacturing burden of the smart reinforcing steel bars is alleviated; the fitted reinforcing steel bars are simple in manufacturing process and circular in sectional surfaces; the clamp has the capabilities of ensuring the monitoring quality and greatly reducing the complexity of on-site manufacturing.

The invention relates to the field of optical fiber sensing and optical fiber communication and particularly to a Faraday rotation mirror independent of wavelength and temperature. The Faraday rotation mirror comprises an optical fiber head, a Nomarski prism, a Faraday rotation mirror and a concave reflector which are arranged in the same straight line successively at intervals. The concave reflector is designed with a circular arc surface or a spherical arc surface plated with a highly reflective film. Compared with the prior art, the Faraday rotation mirror independent of wavelength and temperature uses the concave mirror reflector. The emission light emitted from the optical fiber head is reflected and converges on the optical fiber head, thereby achieving easy coupling and low loss.

The invention relates to a breakage-resistant optical cable, which comprises a reinforcing core, a cable core, a cable core filler, a coated aluminum strip and a polyethylene sheath. The aluminum strip covers the cable core, and the gap between the reinforcing core and the cable core and between the cable core and the coated aluminum strip is filled with cable core fillers, and the polyethylene sheath covers the coated aluminum strip; The core includes an optical fiber, a tube filler and a loose tube. The loose tube covers the optical fiber, and the gap between the fiber and the loose tube is filled with the tube filler; multiple "I" shapes are embedded in the loose tube. The ribs, the roughness of all surfaces of the ribs are <0.4μm. The invention has the advantages of high strength, bending resistance, good tensile resistance, good toughness and long service life, and has very little attenuation in the signal transmission process, and is suitable for long-distance transmission.

The invention relates to the technical field of communication equipment, in particular to a connector and a connector assembly using the same, the connector comprises a connector shell and terminal rows, each terminal row comprises signal differential pairs and grounding terminals, the signal differential pairs and the grounding terminals are sequentially and alternately arranged in the transverse direction, each signal differential pair comprises a pair of signal terminals, at least two terminal rows are arranged at intervals along the longitudinal direction; the connector further comprises a shielding structure, the shielding structure comprises transverse shielding bodies fixedly arranged on the connector shell, the transverse shielding bodies are arranged between any two adjacent terminal rows, the transverse shielding bodies and the terminal rows are arranged at intervals in the longitudinal direction, and at least one side of each transverse shielding body in the longitudinal direction is provided with a transverse shielding body contact part in a protruding mode. And the transverse shielding body contact parts are used for being in contact conduction with the corresponding grounding terminals. The transverse shielding bodies do not need to be sleeved on the grounding terminals when being installed, can be installed independently from the grounding terminal, are not restrained by the grounding terminals, and are easy to install.

The invention provides a ground digital TV five-channel merging modulator which includes power adjustment, where 0-3dB power adjustment and 0.5dB stepping are employed to realize FPGA of IQ two paths of each channel multiplying by a fixed coefficient; upper sampling by inserting three zeros in each two sampling points to realize four-time up-sampling of baseband signals, and by suppressing mirror image frequency spectrum by a cascade Nyquist filter after interpolation; low-intermediate frequency modulation by employing a direct digital frequency synthesizer to generate orthogonal frequency signals required for modulating 15 frequency points; and merging amplitude limit by employing a ternary tree structure to optimize an adder, conducting amplitude limiting processing for the output of the adder, outputting to DA from orthogonal modulation and power amplification to radio frequency output. Compared with five independent modulators, the ground digital TV five-channel merging modulator has the same performance, substantially reduces cost and power consumption, and has higher practical value.

The invention provides a transmission line assembly, an antenna assembly and a mobile terminal, relates to the technical field of communication, and aims to solve the problem of transmission line clutter. A transmission line and a first filter are included. The transmission line is used for transmitting radio frequency signals, and the transmission line is provided with a first end and a second end. Wherein the transmission line comprises an inner conductor and an outer conductor, the first filter is connected with one end of the outer conductor of the transmission line, and the first end of the outer conductor is grounded through the filter. According to the transmission line assembly provided by the invention, the filter is additionally arranged between the outer conductor and the ground, so that the transmission line can be ensured to go down to the ground within a working frequency range, and the clutter position can be moved, and therefore, the clutter can be tuned, and adverse effects generated by the clutter can be reduced.

The invention discloses a strong protection type standard loose sleeve reinforcement armored optical cable. The strong protection type standard loose sleeve reinforcement armored optical cable comprises an internal cladding layer, a shielding layer, an insulation layer, a sheath layer, a filling cavity, an internal battery cell, isolation layers, five external battery cells, a buffer layer and a buffer cavity, wherein the shielding layer is arranged at an outer side of the internal cladding layer, the insulation layer is arranged at an outer side of the shielding layer, the sheath layer is arranged at an outer side of the insulation layer, the filling cavity is arranged at an inner side of the internal cladding layer, the buffer layer is arranged in the filling cavity, the buffer cavity is arranged in the buffer layer, the filling cavity between the buffer layer and the internal cladding layer is filled with a plurality of PP ropes, the five external battery cells are also arranged in the filling cavity, the isolation layers are arranged at outer sides of the external battery cells and the internal battery cell, the internal battery cell is arranged in the buffer cavity, and the diameter of the internal battery cell is half of the diameter of the buffer cavity. The optical cable is simple and reasonable in structure, good in wear resistance, high in anti-interference capability and high in practicability and has certain buffer performance.

The invention, which belongs to the PCB field, provides a PCB connector and a PCB connection structure. The PCB connector comprises a PCB adapter board and L-shaped short-row pins. The pin part is installed and fixed partially at the upper and lower end portions of the PCB adapter board; and positioning columns for positioning and bosses for installing a PCB conveniently are arranged at one end portion of the PCB adapter board. The PCB adapter board carries out ground copper cladding based on needs to realize shielding, so that the signal is protected from being affected and the signal transmission quality is ensured. According to the invention, on the basis of combination of the PCB adapter board and the d L-shaped short-row pins, problems that the connection height and routing are limited between the PCBs are solved; with the copper cladding of the PCB, the signal is protected from being affected; and with the positioning columns, the pre alignment function is realized and thus connector pins are protected from being damaged.

The invention discloses a multi-core indoor optical cable with flame-retardant properties, which comprises an outer insulating layer and an outer sheath layer, an outer shielding layer is arranged on the outer side of the outer insulating layer, and a polytetrafluoroethylene layer is arranged on the outer side of the outer shielding layer. There is a glass fiber layer on the outside of the polytetrafluoroethylene layer, a PVC material layer on the outside of the glass fiber layer, and an outer sheath layer on the outside of the PVC material layer. The outer sheath layer includes a halogen-free polyethylene layer, ceramic Silicone rubber layer and high flame-retardant low-halogen-free polyethylene layer. The structure of the invention is simple and reasonable, which effectively improves the anti-corrosion performance, tensile performance and heat insulation performance of the optical cable, thereby greatly improving the service life of the optical cable. At the same time, through the setting of the outer shielding layer and the inner shielding layer, the anti-interference ability of the optical cable to external signals is improved, and the independence of signal transmission between each optical cable core in the optical cable is also achieved, thereby further ensuring the signal transmission quality in the optical cable. It also avoids the problem of the generation of toxic gas caused by the burning or aging of optical cables.