164 results about "Mode transformation" patented technology

The invention relates to a compact polarization rotation beam splitter, which comprises an input waveguide, a mode conversion region, a mode coupling region and an output waveguide, a TM0 mode optical signal in the optical signals is converted into a TE mode high-order optical signal in the mode conversion area; the mode coupling region is used for coupling the TE mode high-order optical signal into a TE0 mode optical signal with the first adiabatic coupling waveguide; and the output waveguide is used for outputting a TE0 mode optical signal which is not subjected to mode conversion in the optical signals, and outputting a TE0 mode optical signal obtained after mode conversion of the mode conversion area and the second adiabatic coupling waveguide. According to the invention, the polarization rotation path can be shortened through high-order mode conversion in the mode conversion area, efficient beam splitting is realized by using the asymmetric adiabatic coupling waveguide in the mode coupling area, the size reduction of a redundant structure is avoided through function integration, the performance of the beam splitter is ensured, and the problems of large size and low cost of the existing polarization rotation beam splitter are solved. And the performance is not good.

The invention provides a fault positioning method and system for an overhead line of a power distribution network, and a storage medium. The method comprises the steps of obtaining a plurality of fault traveling wave magnetic field signals; performing the following steps on any signal: performing phase-mode transformation on the signal, extracting and decomposing a line mode component, determining a modulus maximum point, and determining the time corresponding to the point as a first fault traveling wave head arrival moment; carrying out clock synchronization on the moment, and obtaining a wave head arrival moment of a second fault traveling wave; obtaining a to-be-detected fault point and a line parameter; based on the wave head arrival moments of the plurality of second fault traveling waves, extracting a head end arrival moment and a tail end arrival moment; and performing fault positioning on the overhead line of the power distribution network based on the head end arrival time, the tail end arrival time and the fault line parameters. According to the fault positioning method for the overhead line of the power distribution network, interference to normal operation of the power distribution network can be avoided, and high-precision non-intrusive positioning of the overhead line of the power distribution network is realized through the tunneling magnetoresistive sensor.

The invention discloses a method for generating high-quality Laguerre-Gaussian vortex light, which comprises the following steps: based on a V-shaped laser resonant cavity of a concave folded mirror, astigmatism is introduced by utilizing different convergence capacities of the concave folded mirror on a meridian plane and a sagittal plane of a light beam, so that the cylindrical symmetry of the resonant cavity is destroyed, and the high-quality Laguerre-Gaussian vortex light is generated; the influence of the cylindrical symmetry of the laser resonant cavity on the intrinsic mode of the cavity is eliminated, so that the intrinsic mode of the cavity is a Hermite-Gaussian mode, and the generation of an ellipse due-Gaussian mode is inhibited; an off-axis pumping method is adopted, and the laser resonant cavity generates high-order Hermite-Gaussian mode laser; the focusing lens focuses the generated high-order Hermite-Gaussian mode laser, so that the beam waist of the high-order Hermite-Gaussian mode laser is positioned in the center of the astigmatism mode converter; the astigmatism mode converter provides conditions for mode conversion by changing the Gouy phase of the laser mode, and high-quality Laguerre-Gaussian vortex light output is achieved.

The invention discloses an ICEEMDAN and improved YOLOv8-based power transmission line fault location method, which comprises the following steps of: respectively constructing a fault identification model and a fault location model by using an improved YOLOv8 network, carrying out phase-mode transformation on a three-phase voltage transient signal of a fault line by using a Karen transform method, selecting a line-mode component as a fault traveling wave research object, decomposing the line-mode component by using an ICEEMDAN algorithm, and carrying out fault location on the three-phase voltage transient signal of the fault line. Using an NTEO algorithm to strengthen a modal component of the line mode component, highlighting fault signal features, and obtaining a fault traveling wave energy spectrogram and an amplified traveling wave energy spectrogram; an initial fault time range is determined by using a fault identification model, and then a fault time point, namely the accurate arrival time of fault traveling wave heads at two ends of the line, is obtained by using a fault positioning model according to the amplified traveling wave energy spectrogram. The method improves the precision of line fault distance measurement, is not affected by transition resistance, fault distance and transmission lines, and is high in reliability and good in practicability.

The invention relates to a polarization independent conversion device of a cascade mode conversion waveguide, and belongs to the field of semiconductor optical signal transmission. The device comprises a substrate of a wafer, a buried oxide layer of the wafer, a device layer and a SiO2 upper cladding layer of the device layer from bottom to top. The device layer comprises an input waveguide, a mode evolution waveguide, a multi-section conical mode conversion waveguide, a polarization beam splitting rotator and a light beam combiner assembly. The mode evolution waveguide realizes high-order conversion from a TM0 mode to a TE1 mode; the multi-section conical mode conversion waveguide converts a TM mode of an optical signal in the input waveguide into a TE mode, and the mode coupling ratio is improved by sequentially superposing the conversion ratio of the TM mode; the phase shifter is used for ensuring that the phase difference of two columns of combined waves is 0; and the light beam combining assembly is used for combining the two columns of TE mode light signals and finally outputting a single-mode waveguide TE mode. According to the invention, TE0 single-mode beam combination output irrelevant to any polarization state of an input optical signal is realized, the structure is simple and compact, and the device is suitable for large-scale integration.

The invention relates to a high-order transverse mode compression state preparation device based on optical parameter resonant cavity mode selection, and belongs to the technical field of quantum state light field generation. Fundamental frequency light and pump light output by the laser source generate a high-order transverse mode light field through the mode conversion module, and then the high-order transverse mode light field enters the optical parametric resonant cavity to be subjected to parametric down-conversion with the nonlinear crystal. The cavity length of the optical parametric resonant cavity is locked at the optimal pumping mode position corresponding to the high-order transverse mode compression state, so that resonance of an impurity mode in the optical parametric resonant cavity can be avoided, and the compression level of a high-order transverse mode light field is improved. Under injection of high-order transverse mode pump light, the pump mode is purified through the optical parametric resonant cavity of the annular structure, the compression level of a high-order transverse mode light field is enhanced, adjustment is easy, practicability is high, productization is easy, and wide application prospects are achieved in the fields of quantum space measurement, biological measurement, atomic force microscope detection and the like.

The invention relates to the technical field of laser communication, in particular to a free space optical communication system, device and method. According to the free space optical communication system provided by the invention, the space light beam is firstly coupled with the multimode optical fiber, and the characteristic that the diameter of a fiber core of the multimode optical fiber is larger is utilized, so that the coupling efficiency is improved, and the energy loss in the coupling process can be effectively reduced. Then, a mode demultiplexer is used, and a mode conversion technology is adopted to separate and convert multiple modes of light in the multimode optical fiber, so that the obtained LP01 mode is separated and converted into a fundamental mode of the single-mode optical fiber to serve as an output optical signal, and the problem that the modes of the multimode optical fiber and the single-mode optical fiber are not matched is solved through the mode conversion technology; and finally, the converted fundamental mode signal in the single-mode fiber is used for communication, so that a high-speed communication module can be better matched.

The invention relates to the technical field of tunneling equipment, in particular to a mode conversion system of a multi-mode shield tunneling machine in a composite stratum, which comprises a prediction layer, a sensing layer, a data bus layer, a decision-making layer and an execution layer: the prediction layer acquires front geological and hydrological information through TSP advanced geological forecast and an infrared water detector; the sensing layer integrates multiple sensors to collect tunneling parameters, and the tunneling parameters are processed through a data fusion algorithm; the data bus layer realizes data space-time alignment based on a distributed stream processing platform; the decision-making layer adopts a CNN + fuzzy logic + reinforcement learning hybrid model to generate a conversion instruction; and the execution layer drives an execution mechanism to complete EPB / SPB / TBM mode conversion, and safety is guaranteed through feedback correction. According to the method, adaptive decision making and seamless execution of mode conversion are achieved, the conversion time is remarkably shortened, tool abrasion is reduced, and the construction efficiency and safety of the composite stratum are improved.

To provide a game machine which can improve the interest of a player.SOLUTION: A sub-control CPU can execute a control for a transition from a first special mode to a second special mode or a third special mode, on the condition of execution of second number of times variation games after a control for a transition to the first special mode. Additionally, the sub-control CPU can execute a control for executing a mode transition performance in the transition from the first special mode to the second special mode or the third special mode. The mode transition performance is executed at a timing after a drawing pattern combination of a performance drawing pattern is temporarily stopped and displayed and before the drawing pattern combination of the performance drawing pattern is definitely stopped and displayed in the second number of times variation games after the control for the transition to the first special mode. Further, a performance time of the mode transition performance is longer than a time during which a control for the second special mode or the third special mode is executed in the second-number-th variation game after a control for the transition to the first special mode.SELECTED DRAWING: Figure 9

The invention discloses a thin-film lithium niobate chip based on mode rotation multiplexing, application and an application method, and belongs to the field of integrated optical devices, and the thin-film lithium niobate chip comprises a grating coupler, a beam splitter, a mode rotation multiplexer and a phase modulator which are sequentially integrated on an LNOI platform in the light propagation direction, the grating coupler, the beam splitter, the mode rotary multiplexer and the phase modulator are all composed of thin-film lithium niobate waveguides, and optical interconnection is achieved among the grating coupler, the beam splitter, the mode rotary multiplexer and the phase modulator through the thin-film lithium niobate waveguides. According to the thin-film lithium niobate chip based on mode rotation multiplexing, the application and the application method, the originally lost TM0 mode is converted into the TE0 mode, and the TM0 mode is combined with the original TE0 mode, so that the intrinsic mode loss of 3dB can be reduced, and the insertion loss of the whole device is reduced by about 30%.

A photonics device including a waveguide and an index smoothing structure is described. The waveguide is configured to carry an optical signal and includes a thin film lithium-containing electro-optic (TFLCEO) material. The waveguide has a first portion, a transition portion, and a second portion. The optical signal has a first mode in the first portion and a second mode in the second portion. The transition portion transfers the optical signal between the first portion and the second portion and transitions between the first mode and the second mode. The index smoothing structure corresponds to the transition portion. The index smoothing structure is configured to transition a first effective index of refraction for the first mode to a second effective index of refraction for the second mode. The index smoothing structure having an intermediate effective index of refraction.

The invention discloses a broadband polarization rotation beam splitter based on a thin-film lithium niobate platform, an LN ridge waveguide structure is prepared on the thin-film lithium niobate platform, and the broadband polarization rotation beam splitter comprises five parts: two gradually-changed conical structures, a straight waveguide, an S bend, a phase shifter and a 2 * 2MMI coupler based on general interference. For TM0 input, a TM0 mode is converted into a TE1 mode through a conical structure, and then the TM0 mode is divided into two TE0 modes with the phase difference being pi; for TE0 input, the TE0 mode is kept unchanged and is divided into two TE0 modes with the phase difference of 0; under the two conditions, a phase difference of pi / 2 is introduced before multimode interference, and for TE0, the phase difference is pi / 2, so that the TE0 is output from CH2, and crosstalk in CH1 is minimized; for TM0, the phase difference is-pi / 2, resulting in the output of TM0 from CH1, minimizing crosstalk in CH2. According to the invention, mode conversion and polarization beam splitting are realized in a compact size.

The invention discloses a polarization rotator and a manufacturing method thereof. The polarization rotator comprises a first waveguide, a first coupling waveguide, a mode conversion waveguide, a second coupling waveguide and a second waveguide which are sequentially connected in a first direction, the first waveguide is used for introducing external first mode polarized light; the first coupling waveguide is used for coupling the first waveguide and the mode conversion waveguide; the mode conversion waveguide is used for converting the first mode polarized light guided by the first waveguide into second mode polarized light, and the mode conversion waveguide has geometric asymmetry in a first direction; the second coupling waveguide is used for coupling the mode conversion waveguide and the second waveguide; the second waveguide is used for exporting the second mode polarized light converted by the mode conversion waveguide; wherein the first direction is a light propagation direction. According to the polarization rotator and the manufacturing method thereof, the device structure can be effectively shortened, and meanwhile efficient conversion rate is achieved.

The present invention belongs to the field of integrated optoelectronic technology and specifically relates to a TE 0 Mode EvolutionTE 1 The input end of the adiabatic mode conversion beam splitter of the present invention comprises a first silicon core; the lower substrate of the first silicon core is silicon dioxide; the upper part of the first silicon core is an upper cladding layer; the transmission mode of the first silicon core is a fundamental mode TE 0 mode; the output end of the adiabatic mode conversion beam splitter includes a second silicon core and a third silicon core; the lower substrate of the second silicon core and the third silicon core is silicon dioxide; the upper part of the second silicon core and the third silicon core is an upper cladding layer; the transmission mode of the second silicon core and the third silicon core is TE 1 mode, and TE 1 The power of the mode in the second silicon core and the third silicon core is equal. The function of the adiabatic mode conversion beam splitter proposed in the present invention is to convert the fundamental mode TE 0 The mode evolves into two TEs at the output end 1 mode, and the power is output evenly at the two output ends, while achieving conversion between different modes and uniform output of energy.

The invention provides an all-fiber polarization-maintaining vortex light amplification system. The all-fiber polarization-maintaining vortex light amplification system comprises a polarization-maintaining seed laser output system, a polarization-maintaining mode conversion device, a fiber polarization controller, a mode matcher, a pumping signal beam combiner, a laser diode light source group, a few-mode polarization-maintaining ytterbium-doped fiber, a cladding mode filter and a water cooling plate. High-power and high-stability vortex light beam output is realized through an all-fiber structure, and a laser mode field of incident laser is controlled through the fiber polarization controller, so that eigenvector modes are superposed to generate a vortex light field; meanwhile, the amplified high-power vortex light field is output through the few-mode polarization-maintaining ytterbium-doped optical fiber, crosstalk between modes can be reduced through the few-mode polarization-maintaining ytterbium-doped optical fiber, the problem of polarization purity and mode purity degradation in the power amplification process is solved, and therefore high-power vortex light field output is achieved.

The invention relates to the technical field of precision optical control, in particular to a sum-difference mode cooperative control double-actuator visual axis stable imaging method and system, and the method comprises the steps: calculating a sum mode variable and a difference mode variable between the angular velocity information of a first actuator and the angular velocity information of a second actuator; performing inverse mode transformation on the two mode variables to obtain independent control commands for respectively controlling the first actuator and the second actuator; the two independent control commands are correspondingly input into the first actuator and the second actuator after being processed through a control algorithm based on data driving. The ultra-high precision of the two actuators is effectively combined, stable control over the optical axis of the optical imaging system is achieved, and the imaging definition and stability of the optical imaging system in the disturbance environment are remarkably improved.

The invention provides a fault position calibration method and system for a flexible DC four-end looped network, and the method comprises the steps: collecting an original voltage traveling wave signal of a fault voltage traveling wave, and carrying out the preprocessing of the original traveling wave signal; performing polarity separation on the preprocessed original traveling wave signal, and performing phase-mode transformation on the original traveling wave signal after polarity separation; carrying out wave head identification on the original traveling wave signal after phase-mode transformation, and judging a path through which each wave head passes; selecting a preset number of wave heads from each wave head, and determining a calculation expression of the preset number of wave heads; and calculating a plurality of different distance measurement results according to the calculation expression of the preset number of wave heads, carrying out weighted average on the plurality of different distance measurement results, and calibrating the initial distance measurement result to obtain the position of the fault point. According to the invention, the position of the fault point can be accurately determined, so that the position of the fault point of the flexible direct-current four-end looped network can be quickly and accurately found out.

The application relates to the technical field of optical communication, and particularly discloses a photon orbital angular momentum mode order multiple transformation device, which comprises an optical coordinate transformation module, an optical 4f low-pass filter module and a reflection module; the optical coordinate transformation module comprises a first phase part and a second phase part with an optical field phase modulation function; a vortex optical field carrying photon orbital angular momentum is emitted from the first phase part, the vortex optical field is transmitted to the reflection module after spiral decomposition and phase modulation of the first phase part, and then is transmitted to the second phase part; the second phase part changes the phase distribution from an angular spiral phase into an angular scaled spiral phase, and then outputs ideal vortex light through the optical 4f low-pass filter module; the photon orbital angular momentum mode order multiple transformation device realizes mode transformation of various multiples, greatly improves the efficiency of mode multiple transformation and the purity after change, and can be widely applied to the field of optical field regulation.

The invention discloses a spiral structure waveguide for vortex light topological charge conversion and an implementation method thereof, and belongs to the field of optical waveguides. The circular waveguide and the spiral structure are combined, the spiral structure is used for regulating and controlling the vortex light mode according to the mode conversion matching condition, and vortex light conversion between any topological charge orders is achieved; according to the invention, complete conversion between different vortex lights is realized, two vortex light mixed beams with different proportions can be generated, and the requirements of generation and utilization of vortex lights with different orders in an integrated photonics on-chip structure are met. According to the method, the problem that topological charges cannot be freely converted among different vortex light modes in a waveguide structure is solved, the application value of the waveguide structure in the aspect of vortex light regulation and control is expanded, and the possibility is provided for an integrated photon platform to utilize vortex light topological charge degree-of-freedom coding information and process calculation tasks. According to the invention, information coding, optical communication, calculation and other applications are carried out by changing the topological charge of the vortex light.

A mode transformation device may include a tapered waveguide having a first face and a second face separated along a guiding direction, where a cross-section of the tapered waveguide at the first face comprises an arrangement of three or more guiding structures, and where the three or more guiding structures include at least a first guiding structure surrounded by a second guiding structure surrounded by third guiding structure. A cross-sectional dimension of at least one of the three or more guiding structures adiabatically changes along the guiding direction such that light propagating through the tapered waveguide has a first optical mode profile at the first face and a second optical mode at the second face, where the light transitions from the first optical mode profile to the second optical mode profile as it propagates along the guiding direction.

The invention refers to a method for coupling of waveguides, providing simultaneous interfacing and polarization and mode conversion between waveguides supporting modes and polarization states with similar or substantially different characteristics, and to a chip (100) comprising a converter structure, and to such converter structure. The invention merges functionalities of mode spot size conversion, mode coupling and transfer, mode type conversion, polarization conversion and polarization splitting. The converter structure is based on vertically stacked waveguides forming a vertical directional coupler (1) connected with different polarization branches (8) integrated into the chip (100).

The present application provides an optical modulator and a control method thereof. The optical modulator includes: an input waveguide for receiving an initial optical signal; a tunable ring resonator, which is coupled to the input waveguide and is used for resonating and modulating the initial optical signal and outputting a first optical signal; a feedback loop waveguide, which is coupled to the tunable ring resonator and is used for receiving and transmitting the first optical signal; a first mode converter, which is coupled to the feedback loop waveguide and is used for performing mode conversion on the first optical signal and outputting a second optical signal; the tunable ring resonator is further used for resonating and modulating the second optical signal and outputting a third optical signal; an output waveguide, which is coupled to the tunable ring resonator and is used for receiving and outputting the third optical signal. The optical signal can be subjected to secondary resonance processing through the tunable ring resonator to improve the extinction ratio of the optical signal.

The invention discloses an active mode demultiplexing module which comprises a mode converter, two optical circulators and a bidirectional semiconductor optical amplifier. The mode converter is used for converting a high-order mode into a fundamental mode to complete primary mode demultiplexing, fundamental mode signals after primary demultiplexing are injected into the bidirectional semiconductor optical amplifier through the two optical circulators from the positive direction and the negative direction respectively, and the signals after being shaped by the bidirectional semiconductor optical amplifier are output by the corresponding optical circulators. A bidirectional symmetrical injection structure is formed, different propagation is beneficial to separation of different signals, and mutual interference, namely mode crosstalk, between forward and reverse signals can be effectively reduced, so that a mode demultiplexing function is better completed, and an output signal has higher signal quality than a primary demultiplexing signal. Besides, by optimizing and adjusting the driving current of the bidirectional semiconductor optical amplifier or an auxiliary optical pumping mode, not only can the gain of the mode channel be dynamically adjusted, but also the power balance of the mode channel and the demultiplexing of a high extinction ratio mode can be realized; the method is especially suitable for receiving few-mode signals in a mode division multiplexing (MDM) optical transmission system and constructing optical switching nodes in a multi-dimensional multiplexing optical network.

The invention discloses an optical polarizer and an optical fiber gyroscope. The optical polarizer comprises a mode hybridization region, a mode coupling region and a light beam combination region, the input end of the mode coupling area is coupled with the output end of the mode hybridization area, and the first output end and the second output end of the mode coupling area are respectively coupled with the first input end and the second input end of the light beam combination area; the mode hybridization region receives input light containing a TE0 mode and a TM0 mode, converts the TM0 mode into a TE1 mode, and then inputs the TE1 mode and the original TE0 mode into the mode coupling region; the mode coupling region outputs the original TE0 mode from the first output end of the mode coupling region, converts the TE1 mode into the TE0 mode, and then outputs the converted TE0 mode from the second output end of the mode coupling region; and the light beam combining area is used for carrying out beam combining processing on the two received beams in a TE0 mode. According to the scheme, the polarization purpose can be achieved, and meanwhile the effect of reducing optical power loss is achieved.

The application provides a method, device and system for light field vector mode conversion, the method comprising: acquiring a cylindrical vector beam field, a fundamental mode Gaussian light array field and a first geometric phase multi-plane light transformation field; determining a first light field and a second light field based on the cylindrical vector beam field, the fundamental mode Gaussian light array field and the first geometric phase multi-plane light transformation field; acquiring a second geometric phase corresponding to a preset condition based on a difference between orthogonal basis vectors of the first geometric phase, the first light field and the second light field and the preset condition; determining a second geometric phase multi-plane light transformation field by using a vector wavefront matching mode based on the second geometric phase; and converting the fundamental mode Gaussian light array field and the cylindrical vector beam field based on the second geometric phase multi-plane light transformation field, thereby realizing multiplexing and demultiplexing of the cylindrical vector beam field, greatly improving the channel capacity of the optical fiber and improving the transmission efficiency of the optical fiber communication.

The invention relates to a polarization-independent mode converter, and belongs to the technical field of wireless communication semiconductor devices. The device comprises a substrate of a wafer, a buried oxide layer of the wafer, a device layer and a SiO2 upper cladding layer of the device from bottom to top, wherein the device layer comprises an input waveguide, a polarization beam splitting rotator, a phase shifter, an optical beam splitter assembly, an optical beam combiner assembly and a micro-ring resonator. The polarization beam splitting rotator is used for converting a TM mode in an optical signal passing through the polarization rotation beam splitter into a TE mode, and the phase shifter is used for ensuring that the phase difference of two columns of waves in beam combination is 0; the optical beam splitter assembly is used for splitting optical power, the optical beam combiner assembly is used for combining two columns of TE mode optical signals, and the micro-ring resonator realizes combined wave and outputs the combined wave through the output end. The mode converter provided by the invention is simple in structure, is used for realizing TE mode conversion of any polarization state input, reduces the coupling loss, improves the coupling efficiency, and obtains a mode conversion device which is irrelevant to polarization and excellent in performance.

A device includes a first mode converter and a second mode converter that define a region between the first mode converter and the second mode converter. The region can contain a plurality of optical modes including at least three modes. The first mode converter and the second mode converter can generate a near-field via a conversion between the plurality of optical modes. The first mode converter can receive an input wave of a first mode and the second mode converter can generate an output wave of a second mode different from the first mode. The first mode converter and the second mode converter can generate a confined near-field via a conversion between the plurality of optical modes.

A 2x2 photonic splitter includes two mode converting Y-junctions. A first stage mode converting Y-junction includes input branch ports adapted to receive an input optical signal propagating in a fundamental spatial mode at either of the input branch ports, a first trunk port, and a first mode converting region. The first mode converting region is adapted to convert at least a first power portion of the fundamental spatial mode of the input optical signal when received via at least one of the input branch ports to a higher order spatial mode at the first trunk port. The second stage mode converting Y-junction includes output branch ports adapted to emit output optical signals having the fundamental spatial mode, a second trunk port, and a second mode converting region optically coupling the output branch ports to the second trunk port. A connected trunk section photonically links the trunk ports.

The invention discloses a mode division multiplexing device based on topological optimization and a mode division multiplexing circulating system, and relates to the field of photon integration and optical communication. The manufacturing method of the mode division multiplexing device comprises the following steps: dispersing the whole design area into adjustable material pixels, wherein the design area is silicon on insulator; determining a target function of a mode division multiplexing device by taking maximization of mode conversion efficiency as a target; by taking the objective function as an optimization objective, automatically updating the distribution of material pixels in the whole design area to obtain a quasi-optimal structure; and optimizing the pixels which cannot meet the manufacturing requirements in the optimal structure until the manufacturing requirements can be met. When a mode division multiplexing device is manufactured, an optimal structure can be automatically searched in a continuous or discrete material parameter space, so that a complex geometrical shape which is difficult to intuitively conceal can be excavated, and ultra-compact, low-loss, low-crosstalk, broadband and robust mode division multiplexing multifunctional photonic devices and the like can be realized in an extremely small size.

The invention provides a V-frequency-band satellite-borne waveguide rotary joint. A mode converter of the rotary joint comprises an input interface; the first transition section comprises a tuning boss, a power dividing structure and a matching structure, the tuning boss is of a stepped structure, the power dividing structure comprises a power dividing plane, a first power dividing wing and a second power dividing wing, the first power dividing wing and the second power dividing wing extend towards the two sides from the power dividing plane and are connected to the matching structure after being bent downwards, and the matching structure is a strip-shaped cube; the transmission circular waveguide is connected with the matching structure, the first power dividing wing and the second power dividing wing, and the extension direction of the matching structure is perpendicular to the extension direction of the transmission circular waveguide; the second transition section is provided with a structure symmetrical to the first transition section; and the output interface has a structure symmetrical to that of the input interface. According to the waveguide rotary joint, the problem that the radial size of the waveguide rotary joint is too large is solved through the downward bending power division structure.