36results about How to "Does not affect transmission performance" patented technology

The invention relates to a multi user communication wire disturbing testing method and device that carries preset orthotropic spread spectrum to the send end on each line, taking cross talk testing to xDSL line according to the received signal vector at receiving end to effectively recognize the cross talk resource, cross talk extent and phase. The invention could also realize the measuring for cross talk value between the lines. The invention supplies basic data for dynamic frequency spectrum managing and DSLAM system optimizing.

The invention provides an on-chip integrated polarization beam splitter and a polarization beam splitting method thereof. The on-chip integrated polarization beam splitter comprises a hybrid plasma waveguide, a coupling waveguide, an S-bend waveguide and an output silicon waveguide, wherein the coupling waveguide, the S-bend waveguide and the output silicon waveguide are located on the same side of the hybrid plasma waveguide, are sequentially connected in series and are equal in thickness. The hybrid plasma waveguide is divided into a metal coverage layer, an upper silicon dioxide layer, a silicon nitride waveguide layer, a lower silicon dioxide layer and a silicon waveguide layer from top to bottom. The coupling waveguide, the S-bend waveguide and the output silicon waveguide are equal to the silicon waveguide layer in thickness. The coupling waveguide is a silicon waveguide. After input signals including transverse electric modes and transverse magnetic modes enter a coupling zone, transverse electric mode light signals are coupled to the taper-type coupling waveguide and then are output through the S-bend waveguide and the output silicon waveguide, and the transverse magnetic mode light signals are directly transmitted along the hybrid plasma waveguide and are directly output, and waveguide coupling does not occur. The on-chip integrated polarization beam splitter has the advantages of being small in size, compact in structure, high in polarization extinction ratio, low in insertion loss, larger in working bandwidth and the like.

The invention relates to a direct-pass type optical fiber sealing device and a method for manufacturing the same. The direct-pass type optical fiber sealing device comprises a metallic flange disk(2) provided with at least one optical fiber through hole(5) along the direction parallel to the axial line, and the inside of the optical fiber through hole(5) is fixedly provided with a metallic tube(3) used for sealing and fixing the direct-pass optical fiber(4) passing the inner part of the metallic tube; and the main sealing structures, between the optical fiber through hole(5) of the metallic flange disk(2) and the metallic tube(3) and between the metallic tube(3) and the metalized part(10) of the direct-pass optical fiber(4), are both of welding seal. The device solves the technical problem existing in the prior that the effective seal cannot be achieved when the optical fiber serving as the transmission line is led out of a sealed blast vessel, and has the advantages of keeping the integrity and continuity of the optical fiber and having good sealing effect.

The invention discloses an energy transferring optical cable. The energy transferring optical cable comprises a core layer, a cladding, a tight cladding and an outer protective layer. The core layer is made of quartz glass materials, and the diameter of the core layer is 0.195 mm-0.205 mm. The core layer is covered with the cladding, the cladding is made of quartz glass materials, and the thickness of the cladding is 0.012 mm-0.016 mm. The cladding is covered with the tight cladding, the tight cladding is made of ethylene-tetrafluoroethylene copolymer materials, and the thickness of the tight cladding is 0.3 mm-0.5 mm. The tight cladding is covered with the outer protective layer, the outer protective layer is made of ethylene-tetrafluoroethylene copolymer materials, and the thickness of the outer protective layer is 0.2 mm-0.5 mm. The energy transferring optical cable has the advantages of being resistant to extra-high voltage, high in flame retardance, high in insulation, resistant to dirt, high in strength, long in service life and the like.

The invention discloses a coupling lens device applied to a vertical cavity surface emitting laser. The coupling lens device comprises a light inlet unit, a light outlet unit and a light reflection unit, wherein the light reflection unit is arranged between light paths of the light inlet unit and the light outlet unit and comprises a first light reflection mechanism, a first corner and a second light reflection mechanism; a first preset angle is formed between the first light reflection mechanism and the first corner; and the light outlet directions of the first light reflection mechanism and the second light reflection mechanism are not intersected. According to the coupling lens device applied to the vertical cavity surface emitting laser, laser beams emitted by a VCSEL can be coupled into an optical fiber, a small part of laser beams can be split to return to a board, optical signals of the beams can be converted into electric signals by virtue of a backlight diode placed on the board, and thus the light emitting state of the VCSEL can be obtained by virtue of a subsequent signal processing circuit.

The invention discloses an immune nano-carrier for conveying siRNA (small interfering Ribonucleic Acid). An active ingredient of the immune nano-carrier is a coupling product of a single-chain antibody and a siRNA conveying carrier; and the siRNA conveying carrier is polyethylene glycol-polyethylene imine-superparamagnetic ferric oxide nanoparticles formed by coupling superparamagnetic ferric oxide nanoparticles with polyethylene glycol-polyethylene imine. Moreover, the invention further discloses a preparation method of the immune nano-carrier. In the immune nano-carrier, the single-chain antibody is coupled with the siRNA conveying carrier, so that the immune nano-carrier has the physicochemical properties of small particle size and appropriate surface potential, high siRNA compounding capability, low cell toxicity, high transfection efficiency, high targeted conveying characteristic, and good application prospects on siRNA conveying and RNA interference-based disease treatment.

The invention discloses a MIMO waveguide leaky cable comprising a waveguide tube and an outer sheath which sleeves the waveguide tube. The waveguide tube is internally provided with a metal baffle plate which is arranged along the length direction of the waveguide tube, and two sides of the metal baffle plate are fixed to an inner wall of the waveguide tube to divide the waveguide tube into a first waveguide and a second waveguide. First radiation slots are arranged on a waveguide tube of the first waveguide with equal intervals, second radiation slots are arranged on a waveguide tube of the second waveguide with equal intervals, and the first radiation slot and the second radiation slot have different polarization directions. According to the MIMO waveguide leaky cable, the metal baffle plate is added to one waveguide, the transmission performance of the waveguide is not affected, a transmission channel can be added in the condition of not increasing the size of the waveguide, the cost is greatly reduced, at the same time, two kinds of different radiation slots are opened on two half waveguides, different polarization directions are generated, an MIMO is formed, compared with a MIMO rectangular waveguide, the MIMO waveguide leaky cable can be formed into discs and is easier to transport, install and maintain.

The invention provides a halogen-free flame retardant hot-melt adhesive film used on a high-frequency transmission wire rod. The halogen-free flame retardant hot-melt adhesive film comprises an insulating thin film layer and an adhesive layer, and is characterized in that the adhesive layer comprises the following raw materials in percentages by weight: 43% to 64% of saturated polyester resin A with the softening point of 85 to 95 DEG C, 5% to 10% of saturated polyester resin B with the softening point of 105 to 120 DEG C, 25% to 30% of a halogen-free flame retardant agent A, 5% to 10% of a halogen-free flame retardant B, 0.2% to 2% of isocyanate and 0.8% to 5% of a filler. According to the halogen-free flame retardant hot-melt adhesive film provided by the invention, self adhesion can berealized at the temperature of 100 to 130 DEG C, and the adhesive film is stabler in structure and simple and convenient to process and has good halogen-free flame retardant insulation and high-temperature resistance.

The invention discloses a medium-voltage soft-conductor photoelectric integrated cable comprising a plurality of power units. The power units are covered with a water stop layer, a liner layer, a wire armored layer and an outer sheath layer in order. A plurality of fiber units are disposed in gaps among the power units. Each power unit comprises a soft-conductor wire core which is covered with an inner shield layer, an insulating layer and an outer shield layer in order. Each fiber unit comprises a loose tube accommodating a fiber core, fiber paste and a reinforcing wire, and the loose tube of the fiber unit is covered with an asbestos cloth layer and a silicone layer in order. When the medium-voltage soft-conductor photoelectric integrated cable operates at high temperature for a long time, the interior temperature of the cable can be lower than 60 DEG C, and the transmission performance of the cable is unaffected; in addition, the asbestos cloth and silicone wrapping the fiber units also has the function of enhancing fiber outer support, and the fiber units are protected from crush when the fiber units and the power units are stranded into the cable.

The invention relates to the technical field of optical network communication, in particular to an intelligent optical network communication system based on a wavelength division multiplexing optical switching technology, which comprises an optical transmitter, an optical relay amplifier, an optical receiver, an optical monitoring channel and a network management system. According to the optical transmitter, optical signals output by terminal equipment are converted into signals with stable specific wavelengths through an optical transponder at a transmitting end, signals with fixed wavelengths are synthesized into multi-channel optical signals through a combiner, and the multi-channel optical signals are amplified and output through an amplifier. The invention has the beneficial effects of fully utilizing huge bandwidth resources of the optical fiber, increasing the transmission capacity of the optical fiber, reducing the cost, having great application value and economic value, being capable of transmitting signals with completely different characteristics, completing integration and separation of various signals, realizing mixed transmission of multimedia signals, saving a large amount of line investment, and the extremely high requirements on the performance of some devices can be reduced, and meanwhile, high-capacity transmission can be realized.

The invention discloses a modularized Pin-to-microstrip transition structure, which comprises a metal seat, a trapezoidal through hole is formed in the metal seat, a Pin is arranged in the through hole, an upper-layer substrate is fixed on the upper side of the metal seat, a transition substrate is arranged on the upper surface of the upper-layer substrate, and the metal seat is fixed on the transition substrate. An upper substrate through hole is formed in the position, corresponding to the through hole, of the upper substrate, a transition substrate through hole is formed in the portion, corresponding to the upper substrate through hole, of the transition substrate, the length of the transition substrate is smaller than that of the upper substrate, an upper substrate microstrip line is formed in the portion, on one side of the transition substrate, of the upper substrate, and a lower substrate microstrip line is formed in the portion, on the other side of the transition substrate, of the upper substrate. The upper end of the Pin is connected with one end of the microstrip line of the upper substrate through a metal structure located on the transition substrate. The transition structure has the advantages of high reliability, small size, low assembly difficulty and the like.

The invention belongs to the technical field of functional materials, and particularly relates to a heat-sensitive material, an electrode, a preparation method of the electrode and a lithium secondarybattery. According to the heat-sensitive material, polythiophene or a polythiophene derivative is added, so lithium ion diffusion and electron transmission performance are not influenced at normal temperature; when the ambient temperature rises to a certain temperature, the internal resistance of the polythiophene and derivatives thereof can be obviously increased, so that the diffusion of lithium ions and the transmission of electrons are blocked. The heat-sensitive material provided by the invention is a positive temperature coefficient heat-sensitive material, and the resistivity of the heat-sensitive material can be increased along with the rise of the temperature. The heat-sensitive material can be coated on the surface of an electrode to form a heat-sensitive material layer, when the obtained lithium secondary battery is subjected to thermal runaway and the internal temperature rises rapidly, the internal resistance of the heat-sensitive material layer is increased remarkably tobecome an insulating layer, further thermal runaway is prevented, and the safety performance of the battery is improved remarkably.

The present invention provides a self-supporting branch optical cable capable of night identification, belonging to the technical field of cable. The cable comprises a suspension wire, main cables, afirst connection rib, a second connection rib, a third connection rib and lighting strips, there are three main cables which are arranged at one side of the suspension wire in a triangular shape and are connected with the suspension wire respectively through the first connection rib, the second connection rib and the third connection rib, the first connection rib and the second connection rib aresymmetrically distributed relative to the third connection rib, there are at least two lighting strips which are arranged on the first connection rib and / or the second connection rib and / or the thirdconnection rib and / or the main cable. The lighting strips can perform self lighting at night with different colors to facilitate identification of each main cable in a night dark environment, and thelighting strips cannot be subjected to lighting friction with a pipeline in the construction process, and are not easy to be worn and damaged so as to effectively improve the service life; and moreover, the main cables employ three center pipe-type cables with the same structure, and the fiber optic capacity is three times of a common optical cable.

The invention discloses a separable butterfly-shaped leading-in optical cable assembly which comprises an optical cable body and an optical cable stripping device used for stripping the optical cablebody. The optical cable body comprises an optical cable reinforcer, an optical fiber and an outer sheath, separation gaps are formed in the outer sheath and located on the left side and the right sideof the optical fiber, and optical cable separation grooves are formed in the portions, corresponding to the upper side and the lower side of each separation gap, of the outer sheath respectively; theoptical cable stripping device comprises a shell, an upper cutter and a lower cutter are installed in the shell, and when the optical cable stripping device is used, the distance between the two upper cutters and the distance between the two lower cutters are matched with the distance between the optical cable separating grooves. A through hole is formed in the other side of the shell; during stripping, the optical cable passes through the through hole, the optical cable separating groove is ensured to be just located at the position of the cutter, and then when the cutter and the optical cable move relatively, the optical cable can be smoothly separated, cut and separated to form an optical fiber-containing part and two reinforcer-containing parts so that the size of the optical cable isreduced, and the optical cable is convenient to lay in the pipeline without influencing the transmission performance of the optical fibers in the optical cable.

The invention discloses an optical fiber self-healing looped network camera adopting a network technology of a fiber self-healing looped network. The camera comprises a lens, an image sensor module, a control circuit, a video compressing and encoding module, an optical fiber self-healing looped network module, a video compressing and encoding module and an analog / digital video output interface module, wherein an original image obtained by the image sensor module is compressed and encoded by the video compressing and encoding module and then is packaged into an IP packet signal; the optical fiber self-healing looped network module receives the IP packet signal sent by the video compressing and encoding module and finishes the optical fiber access of the IP packet signal self-healing looped network; and the analog / digital video output interface module performs A / D conversion to the original image obtained by the image sensor module and outputs an analog or digital image signal. The camera can adapt to large-scale, long-distance, high-reliable networking transmission and control requirements of HDV, has a shooting function and has the functions of optical fiber self-healing looped network networking and image transmission.

The invention discloses a motor with a braking and decelerating mechanism and for an actuating device. The motor comprises a body, a rotary shaft and the braking and decelerating mechanism, wherein the rotary shaft is penetratingly connected at the center of the body, the braking and decelerating mechanism comprises a frictional component and a spiral spring, the frictional component is connected on the peripheral edge of the rotary shaft in a sleeved manner, the spiral spring is elastically clamped on the periphery of the frictional component, one end of the spiral spring is positioned on the body, and the spiral spring can press the frictional component to brake the rotary shaft to decelerate when the rotary shaft rotates unidirectionally. Consequently, the motor with the braking and decelerating mechanism and for the actuating device is prolonged in service life due to low loss of the spiral spring, and good in braking and decelerating performance due to large contact area between the frictional component and the rotary shaft.

The invention provides a protection circuit of a communication interface. The circuit includes: a first-level protection circuit, a second-level protection circuit and a third-level protection circuit connected in sequence, wherein: the first-level protection circuit includes a current discharge circuit, wherein the current discharge circuit It includes three connection ends, the first connection end is connected to the first signal line of the two signal lines of the RS-485 port, the second connection end is connected to the second signal line of the two signal lines of the RS-485 port, The third connection terminal is connected to the protective ground; the second-level protection circuit includes a first current-limiting resistor, a second current-limiting resistor and a bidirectional transient suppression diode; the third-level protection circuit includes a voltage discharge circuit, wherein the voltage discharge The amplifier circuit is connected to the communication ground, and one end is connected to the two signal lines of the RS‑485 port, and the other end is connected to the RS‑485 transceiver.

The invention relates to an organic solar cell structure based on a dimethacrylate monomer and a preparation method thereof, comprising a transparent conductive substrate, an electron transport layer, an organic active layer, a hole transport layer, and a metal electrode from bottom to top; The organic active layer includes P3HT:PCBM and dimethacrylate monomer. Dimethacrylate monomer is added to the organic active layer, and an insoluble insulating network skeleton is formed after ultraviolet treatment, which solves the problem of unstable morphology of the organic active layer. , so that the organic active layer has good thermal stability. And the mechanical properties of the film are improved, which provides technical assistance for flexographic printing.

The invention relates to an organic solar cell structure based on a dimethyl acrylate monomer, and a preparation method for an organic solar cell structure. The structure sequentially comprises a transparent conductive substrate, an electronic transmission layer, an organic active layer, a hole transmission layer and a metal electrode from the bottom to the top. The organic active layer comprisesa P3HT: PCBM and a dimethyl acrylate monomer. The dimethyl acrylate monomer is added to the organic active layer. An insoluble insulating network skeleton is formed through ultraviolet treatment, thereby solving a problem that the organic active layer is not stable in shape, and enabling the organic active layer to be good in thermal stability. Moreover, the structure improves the mechanical performances of a film, and provides technical help for the flexible printing.

The invention discloses a single-fiber bidirectional transmission system based on mode division multiplexing. The single-fiber bidirectional transmission system based on the division multiplexing mainly comprises two optical signal input units, two optical signal output units and a mode division multiplexing and demultiplexing unit, wherein the mode division multiplexing and demultiplexing unit comprises two mode-type multiplexers which are connected through few-mode fiber. Polarization multiplexing optical signals are generated by the signal input units, the polarization multiplexing optical signals are enabled to be coupled into a mode field of the few-mode fiber by the mode-type multiplexer to finish the mode division multiplexing, the polarization multiplexing optical signals carried by the mode field are sent to the other mode-type multiplexer through the few-mode fiber, the received polarization multiplexing optical signals are enabled to be coupled into single-mode fiber by the other mode-type multiplexer and sent to the optical signal output units through the single-mode fiber, polarization diversity, mixing and balance detection are carried out on the received optical signals by the signal output units, then the received optical signals are changed into electric signals and then changed into digital signals. According to the single-fiber bidirectional transmission system based on the mode division multiplexing, the few-mode fiber is used for overcoming Rayleigh backward scattering effect, single-fiber bidirectional transmission is achieved, and use efficiency of optical fiber and wavelength resources is improved.

The invention relates to a gateway VXLAN selectable encrypted data transmission method. A VXLAN home terminal negotiates selectable encrypted data transmission, a home terminal supporting VXLAN encrypted data transmission tries to negotiate an encryption option before sending data to an opposite terminal, and starts data encryption transmission after negotiation succeeds, and the method comprisesthe following steps that the VXLAN home terminal sends a selectable encryption request message to the opposite terminal; the VXLAN home terminal waits for an optional encryption response message; theVXLAN home terminal sends an encrypted message of an agreed plaintext to the opposite terminal; the VXLAN home terminal waits for a key negotiation result message; and after negotiation, the VXLAN home terminal sends the data packet. The VXLAN supports encryptable negotiation and data transmission, and the gateway starts a VXLAN function to negotiate whether to select encryption or not with the opposite end VTEP; the gateway negotiates encryption detailed configuration with the opposite terminal and confirms the consistency of the secret key; the gateway and the opposite terminal start data encryption transmission; and a symmetric encryption mode is selected, so that the security is high.

The invention discloses a radio resource management device with quick response. The radio resource management device comprises a radio network controller; the wireless network controller is connected with a communication unit, the communication unit is connected with an upper computer, and the wireless network controller comprises a resource scheduling module, a resource allocation module, an interference management module and a data transmission module; the resource allocation module comprises a wireless resource allocation module and a dynamic adjustment module, the wireless resource allocation module performs specific user resource allocation on the premise that the number of sub-channels of each virtual network is determined, and the dynamic adjustment module dynamically adjusts the number of the sub-channels allocated by each wireless network; appropriate channels are allocated according to the rate performance of the users, the demands of different users are met, the resource allocation rate is increased, the system performance is improved, and the user network rate is increased. The interference management module is combined with deep learning to suppress interference of signals, so that the influence of external interference is reduced, and the security of data transmission is enhanced.

The present invention proposes an anti-surge circuit for an Ethernet interface. By setting a power supply protection circuit, it mainly protects the differential mode protection of live wires and neutral wires and the common mode protection of live wires to ground and neutral wires to ground; The protection circuit can choose different paths for the positive and negative currents to absorb the high-power current and play a protective role; by setting the first-level protection circuit and the second-level protection circuit in the protection circuit, the differential mode protection capability of the network port is enhanced. And it will not affect the network transmission performance, can guarantee the original network transmission distance and transmission speed, the network transmission distance and network port waveform can meet the specification requirements, and has a good lightning protection effect.

The invention provides an Ethernet interface surge preventive circuit. A power protection circuit is used to realize differential mode protection for live wire and zero line parts and common mode protection for live wire grounding and zero line grounding; a POE buckle plate protection circuit is arranged to selected different paths for positive and negative currents to absorb large power current and play a protection role; and the protection circuit is provided primary and secondary protection circuits, the differential mode protection capability of the network port is enhanced, transmission performance of the network is not influenced, original network transmission distance and speed can be ensured, the network transmission distance and network port waveform can meet the standards, and alightning protection effect is good.

The invention discloses a hinge structure with a signal transmission line. The hinge structure comprises at least two rotating vanes and two parallel rotating vane connecting pieces arranged between the two adjacent rotating vanes, i.e. a first rotating vane, a second rotating vane, a first rotating vane connecting piece and a second rotating vane connecting piece, wherein the first and second rotating vanes are connected through the first and second rotating vane connecting pieces in a rotating manner; each rotating vane connecting piece comprises at least two parallel signal transmission channels; the signal transmission channels in each rotating vane connecting piece are in S-shaped connection; a signal of a first unit connected with the first rotating vane can be transmitted into a second unit connected with the second rotating vane. According to the hinge structure with the signal transmission line, the signal transmission channels are designed as in the S-shaped connection, so that the signal transmission channels are perpendicular to a rotating direction, are namely parallel to the hinge structure, and are not likely to be bent along with bending of the hinge structure, influence on transmission performance of the signal transmission line is eliminated, and long service life is ensured.

The invention discloses production equipment for a high-density optical fiber bundle micro unit optical cable. The production equipment comprises a reinforcing piece pay-off device, an optical fiber bundle micro unit pay-off device, a water blocking unit pay-off device, a stranding device and a jacket extruding device, wherein the inlet of the jacket extruding device is provided with a blowing device, an optical fiber bundle micro unit is released from the optical fiber bundle micro unit pay-off device and then enters the stranding device together with a water blocking yarn released from the water blocking unit pay-off device so as to be stranded, the stranded optical fiber bundle micro unit and an reinforcing piece released from the reinforcing piece pay-off device enter the jacket extruding device through the blowing device so as to extrude jackets. According to the production equipment for the high-density optical fiber bundle micro unit optical cable, before the micro unit bundle enters the jacket extruding device, the optical fiber bundle micro unit has a certain structure exceeded length, so that the tensile performance of the optical cable is improved; and the blowing deviceis added before the jacket extruding device, so as to ensure the cable round through the action of air flow.

The invention discloses a hinge structure with a signal transmission line. The hinge structure comprises at least two rotating vanes and two parallel rotating vane connecting pieces arranged between the two adjacent rotating vanes, i.e. a first rotating vane, a second rotating vane, a first rotating vane connecting piece and a second rotating vane connecting piece, wherein the first and second rotating vanes are connected through the first and second rotating vane connecting pieces in a rotating manner; each rotating vane connecting piece comprises at least two parallel signal transmission channels; the signal transmission channels in each rotating vane connecting piece are in S-shaped connection; a signal of a first unit connected with the first rotating vane can be transmitted into a second unit connected with the second rotating vane. According to the hinge structure with the signal transmission line, the signal transmission channels are designed as in the S-shaped connection, so that the signal transmission channels are perpendicular to a rotating direction, are namely parallel to the hinge structure, and are not likely to be bent along with bending of the hinge structure, influence on transmission performance of the signal transmission line is eliminated, and long service life is ensured.

Provided is a trigger optical cable applied to the field of ultra-high voltage power transmission. The trigger optical cable applied to the field of the ultra-high voltage power transmission comprises a core layer, a wrapping layer, a coating layer, a tight wrapping layer, a reinforced layer and an outer protective layer from inside to outside in sequence. The core layer is of a solid structure, the wrapping layer wraps the outer wall of the core layer, the coating layer wraps the outer wall of the wrapping layer, the tight wrapping layer wraps the outer wall of the coating layer, the reinforced layer wraps the outer wall of the tight wrapping layer, and the protective layer wraps the outer wall of the reinforced layer. The tight wrapping layer is made of Hytrel materials of flame-retardant level, the outer protective layer is made of fluoroplastics, the reinforced layer is filled with aramid fibers, and the refractive index of the core layer is larger than that of the wrapping layer. The trigger optical cable applied to the field of the ultra-high voltage power transmission does not influence the transmission performance of the optical cable in the near-infrared band in an 800nm-1400nm range under the premise that the ultra-high voltage endurance level and the flame-retardant level of the whole product are ensured, and is resistant to corrosion, resistant to high low temperature, inflaming retarding, insulative, resistant to ultra-high voltage, resistant to treading and free of damage.

The invention provides a micro beam tube bow type drop optical cable and belongs to the field of bow type drop optical cables. The micro beam tube bow type drop optical cable includes an optical cablebody. The optical cable body includes a protection sleeve, an optical communication unit and a reinforcement member; the protection sleeve is wrapped around outer parts of the optical communication unit and the reinforcing member; the optical communication unit includes a micro beam tube and at least four optical fibers, a plurality of optical fibers are arranged inside the micro beam tube, and the micro beam tube is made of polyolefin material. The bow type drop optical cable adopts a multi-core micro beam tube structure, high-density optical fiber distribution of the bow type drop optical cable is realized, and transmission performance of the optical fibers is not affected. Characteristics of small size, light weight, simple access mode and the like of a traditional bow type optic cableare retained while needs of great bandwidth access can be met. The optical cable disclosed in the invention is developed for future 5G and networks with improved speed access.