48 results about "Waveguide mode" patented technology

The invention provides a single-port input / output multi-state adjustable waveguide mode converter and a preparation method thereof, and belongs to the technical field of on-chip silicon-based polymer hybrid integrated waveguide mode converters. According to the invention, a double-layer MZI parallel combination structure is adopted, independent electrodes are configured at specific positions of interference arms, and corresponding modulation signals are applied, so that accurate regulation and control of an input light field are realized. When E00-mode signal light is input, the structure can dynamically realize the conversion function of three modes of E00 / E01 / E10 on the premise of keeping single-port output, and the mode conversion efficiency reaches 95%. And the device is compatible with a standard silicon-based CMOS (Complementary Metal-Oxide-Semiconductor Transistor) process, is beneficial to reducing the manufacturing cost and promoting large-scale integrated application, is suitable for the fields of a high-capacity mode division multiplexing system and multi-dimensional optical signal processing, and can meet the urgent requirements of modern optical communication on high-integration-level, reconfigurable operation and low-cost devices.

The invention discloses a photoelectric co-packaging adapter plate and a photoelectric co-packaging device. A photoelectric co-packaging adapter plate comprises a first coating layer and a second coating layer which are formed on a substrate, and an optical waveguide arranged between the first coating layer and the second coating layer, and the refractive index of the optical waveguide is larger than the refractive index of the first coating layer and the refractive index of the second coating layer; a light emitting window is formed in the second coating layer, an aspherical lens is arranged on the light emitting window, a first reflecting part is arranged at the first end part of the optical waveguide, and the first reflecting part is used for forming a light path between the optical waveguide and the aspherical lens. According to the technical scheme provided by the invention, loss caused by mismatching of a micro-nano optical chip mode field and a silicon optical waveguide mode field is reduced, and alignment precision requirements between different modules are reduced.

The application discloses a waveguide mode priority control system based on a coating technology and relates to the field of waveguide gas lasers.The system comprises a boundary construction unit, a radial discharge unit, a mirror cooling unit and a basic mode optimization unit.The boundary construction unit is sequentially distributed with a central clearance mode surface, a peripheral closed traction ring and an outer return discharge belt from inside to outside on the inner surface of an electrode plate.The radial discharge unit is provided with a radial discharge bridge between the traction ring and the discharge belt, and a gradient conductive layer with continuously decreasing resistivity is laid on the surface of the bridge.The mirror cooling unit is provided with a mirror cooling flow channel and a cooperative heat dissipation structure at the position corresponding to the traction ring and the discharge bridge inside the electrode plate.The basic mode optimization unit is connected with a dynamic impedance matching compensation network.Through deep cooperation of space geometry traction, gradient impedance outer guide and isomorphic thermodynamics locking, the application intercepts and directionally discharges micro-discrete charges, avoids the invasion of charge boundaries into the core clearance area, effectively dissipates the energy of high-order mode flanks, and thus stabilizes the output of high-purity basic mode priority laser beams.

A silicon-phase change material hetero-integrated waveguide structure includes a silicon flat plate layer and a phase change material deposited on the silicon flat plate layer. A non-volatile waveguide phase shifter includes a base layer, a hetero-integrated waveguide structure and a silicon waveguide mode spot conversion structure fixed on the base layer, two ends of the hetero-integrated waveguide structure are symmetrically connected to the silicon waveguide mode spot conversion structure; the silicon waveguide mode spot conversion structure includes two silicon waveguides with narrow-to-wide and an ridge waveguide with wide-to-narrow arranged in axial symmetry; an aluminum oxide film is covered on the phase change material, a single-layer graphene is on the aluminum oxide film, and a metal layer is on the single-layer graphene, the metal layer includes two metal electrodes. The single-layer graphene forms ohmic contact with the metal electrodes, current passes through the graphene to generate heat, the heat is conducted through the aluminum oxide film below the single-layer graphene to provide heat required for phase change of the low-loss phase change material. The phase shifter has the advantages of compact structure, low insertion loss, small driving voltage, low phase change power consumption, non-volatile phase adjustment, etc. and can be used as a core optical path regulation device in an integrated optoelectronic chip.

The invention provides a topological interference power divider, a power control method and related equipment. The topological interference power divider comprises a dielectric substrate; the upper copper layer and the lower copper layer are arranged on the surface of the dielectric substrate; the valley photonic crystal structure is composed of triple symmetric apertures of periodic triangular lattices etched on the upper copper layer; the structure comprises A-type unit cells and B-type unit cells which are alternately arranged, the topological waveguide channel is a domain wall formed by the interface of the A-type unit cell and the B-type unit cell, and the channel comprises a plurality of branches which are intersected in a central area to form a coherent interference area; the input port and the output port are respectively arranged at the head end and the tail end of the topological waveguide channel; a matching network is arranged between each port and the channel and is used for realizing conversion between a conventional guided wave mode and a topological edge state; the modulation of the output power distribution ratio, the central working frequency or the transmission bandwidth of the topological interference power divider can be realized by regulating and controlling the topological edge state in the coherent interference region, and the flexibility and the reconstruction capability of power distribution are improved.

This invention discloses a high-efficiency nonlinear optical frequency converter based on high-power continuous optical transmission using quartz micro / nano fiber, comprising a wavelength-tunable laser, an optical fiber amplifier, a quartz micro / nano fiber, a sealed cavity, and an optical fiber low-pass filter; the quartz micro / nano fiber includes a first untapered portion, a second untapered portion, a first tapered transition region, a second tapered transition region, and a waist region, transmitting an optical field TE. 01 The mode cutoff method precisely controls the waist diameter of micro / nano fiber and accurately tunes the input light wavelength. The nonlinear light frequency conversion process excited by high-power continuous light transmitted in quartz micro / nano fiber satisfies perfect phase matching. The fundamental mode of the input light and the higher-order mode fields of the harmonic signal light have high overlap in the waveguide mode, which can efficiently generate continuous second and third harmonic signal light. The device has high stability, high efficiency, and low cost, and can be applied in fiber lasers, all-optical signal processing, fiber optic sensing and other fields.

A multi-mode microwave waveguide blade sensing system (500) includes a transceiver, a waveguide (174b), and a probe sensor (176). The transceiver generates a microwave energy signal having a first waveguide mode and a different second waveguide mode. The waveguide (174b) includes a first end that receives the microwave energy signal. The probe sensor (176) includes a proximate end (178a) that receives the microwave energy signal from the transceiver and a distal end (178b) including an aperture that outputs the microwave energy signal. The probe sensor (176) directs the microwave energy signal at a first direction based on the first waveguide mode and a different second direction different based on the second waveguide mode. The probe sensor (176) receives different levels of reflected microwave energy based at least in part on a location at which the at least one microwave energy signal is reflected from the machine.

This invention discloses a method for operating in a circular waveguide TE 11 This invention relates to a millimeter-wave high-power rotating reflective waveguide phase shifter, belonging to the field of millimeter-wave transmission technology. It comprises a rectangular waveguide wide-side slot 3dB coupler, a rectangular-circular waveguide transition section, and a rotating circular waveguide phase shifting section, with its central plane divided into two symmetrical microwave channels. Electromagnetic waves are first injected through the first port of the rectangular waveguide wide-side slot 3dB coupler, then split into two paths entering the rectangular-circular waveguide transition section through the third and fourth ports of the coupler, and subsequently injected into the rotating circular waveguide phase shifting section. After propagating a certain distance within the two phase shifting waveguides, the waves are reflected by a rotating metal plate piston and finally output from the second port of the rectangular waveguide wide-side slot 3dB coupler. This invention modulates the phase at the output end by changing the electrical length of the electromagnetic wave propagating within the phase shifting section by rotating the position of the metal plate piston. Within the same operating frequency band, it possesses advantages such as high power capacity, compact structure, high phase shifting accuracy, and a large phase shifting range.

This invention relates to a high-efficiency and compact hollow circular waveguide mode purifier, comprising five parts: a main waveguide, an input waveguide, a spherical waveguide, a re-entry resonant cavity, and an output waveguide; this invention can maintain high TM over a wide bandwidth. 01 TM 02 - TM 01 The mode conversion efficiency is high, which can effectively adapt to application environments with various mode compositions. This invention adopts a spherical corrugated waveguide and a re-entry resonant cavity, which has a simple structure and compact axial length, providing a feasible technical route for achieving compact mode purification.

The photoelectric device of multimode demultiplexing spectrometer and spectral reconstruction method relate to mode division (demultiplexing) spectroscopy. The photoelectric device is composed of a plurality of photoelectric detectors in cascade, each of which includes an SOI substrate, a silicon oxide layer, a multimode waveguide with two side branches, a two-dimensional material absorber and a metal electrode. The spectral reconstruction method includes a single-mode spectral reconstruction method, a single-sample multimode reconstruction algorithm and a multi-sample resolution enhancement reconstruction method. Different spectral information is modulated on different waveguide modes, then input into the multimode demultiplexing spectrometer, and a photocurrent is generated on each photoelectric detector. By using the spectral reconstruction method, single-mode spectral reconstruction under single sample, one-time multimode mixed spectral reconstruction and resolution enhancement spectral reconstruction under multi-sample are realized. The multimode demultiplexing spectrometer can simultaneously realize mode demultiplexing function and spectral detection capability, greatly reducing the complexity of the wavelength-division-mode-division hybrid multiplexing system.

The invention discloses a compact broadband circular waveguide TM01 mode bending structure, and aims to solve the technical bottleneck that an existing circular waveguide TM01 mode bending structure is difficult to consider the aspects of bandwidth, structural compactness and power capacity at the same time. The antenna is composed of two circular waveguide TM01 mode power dividers, two E-plane U-shaped folded waveguide arrays and two E-plane rectangular bent waveguide arrays. The coaxial waveguide TEM mode and the multi-path rectangular waveguide TE10 mode are adopted as the middle transition mode of the antenna, and the problem of mode competition in a traditional bending structure is effectively solved. Meanwhile, by utilizing an E-plane U-shaped folded waveguide phase compensation technology, the length of each rectangular waveguide transmission path between the two circular waveguide TM01 mode power dividers is ensured to be consistent, the relative working bandwidth of which the transmission efficiency of a bent structure is greater than 95% is widened to be more than 40%, the power capacity is improved to the GW magnitude, and the distance between input / output ports is shortened to be within 5 times of the central wavelength.

The invention discloses a mode loss constant type low-threshold tunable phase shifter based on a lossy phase change material, and aims to solve the problem that the phase shifter based on the lossy phase change material is unstable in performance due to large dual-state mode loss difference. The mode loss constant type low-threshold tunable phase shifter based on the lossy phase change material comprises a SiO2 substrate, a silicon waveguide, a VO2 thin film layer and a cladding, the rectangular silicon waveguide is arranged on the SiO2 substrate, the VO2 thin film layer is heterogeneously integrated on the upper surface of the silicon waveguide to form a heterogeneously integrated waveguide, the cladding covers the silicon waveguide, and the VO2 thin film layer is arranged on the upper surface of the silicon waveguide. The size structure of the VO2 thin film layer enables the waveguide mode loss variation before and after the phase change of the VO2 thin film to be zero. According to the phase shifter, the effective refractive index change is realized by regulating the size of the VO2 thin film layer, so that the phase regulation target is achieved, the mode loss is kept constant, the jitter of the amplitude of a system signal in the phase shifter is avoided, and the power consumption of the device is reduced at the same time.

The present disclosure provides a side-fed waveguide 1x4 circularly polarized antenna array and its application, which comprises: a power division feeding network comprising a primary power division network and a secondary power division network connected with the primary power division network; wherein the primary power division network adopts a side feeding mode, is used for realizing mode conversion from a coaxial line mode to a waveguide mode, and performing power division conversion on a fed-in signal to output a 1:2 primary power division signal; the secondary power division network is used for converting the 1:2 primary power division signal into a 1:4 secondary power division signal; and a four-ridge metal cavity circular polarizer is coupled and connected with the power division feeding network through a coupling gap, and is used for realizing circularly polarized radiation of the 1:4 secondary power division signal.

Device comprising: a photonic integrated circuit (PIC) containing multiple optical waveguides; a polarization rotator structure (301, 401) integrated in the PIC and optically coupled at a first end to at least one of the optical waveguides, wherein the polarization rotator structure (301, 401) includes: a first core structure (C2) formed in a first layer, wherein the first core structure (C2) extends from the first end to a second end of the polarization rotator structure (301, 401), and a second core structure (C1, C3) formed in a second layer located at a different depth than the first layer and close to the first core structure, wherein the first core structure (C2) and the second core structure (C1, C3) provide mode hybridization between at least two orthogonally polarized waveguide modes of the polarization rotator structure (301, 401), and wherein the first layer and the second layer are separated by a third layer comprising a material that differs from a core material of the first core structure and from a core material of the second core structure, and / or the core material of the first core structure differs from the material of the second core structure; and an optical divider structure (302, 402) integrated in the PIC and optically coupled at a first end to the second end of the polarization rotator structure (301, 401) and optically coupled at a second end to at least two of the optical waveguides, wherein the optical divider structure (302, 402) comprises: a first core structure (C2) associated with at least one of the first or second core structures of the polarization rotator structure (301, 401), and a second core structure (C1, C3) that is separated from both the first and second core structures of the polarization rotator structure (301, 401).

This invention relates to the field of waveguide gas laser technology, specifically to a method and device for preferentially controlling the electrode electric field to prioritize the lowest-order waveguide mode through coating, comprising the following steps: S1: determining the beam waist position of the laser resonator; S2: preparing an insulating coating on the surface of the waveguide laser electrode plate corresponding to the beam waist position; S3: performing a gradient transition edge treatment on the insulating coating; S4: constructing an impedance matching compensation network at the electrode feed end in the insulating coating region. This invention, by setting an insulating coating, achieves localized reduction of the electric field intensity in the beam waist region; simultaneously, by constructing an impedance matching compensation network, it accurately compensates for the capacitance effect introduced by the coating, and through dynamic monitoring and adjustment, ensures that the standing wave ratio and discharge voltage fluctuations are within a minimal range, guaranteeing effective coupling of RF power and uniform and stable discharge, thereby improving the overall efficiency and reliability of the device.

This invention relates to the field of terahertz technology and provides a method and system for terahertz mode decomposition based on spatial and spectral resolution imaging. Addressing the limitations of existing technologies in achieving high-precision, non-invasive mode field imaging and analysis in the terahertz band, this invention proposes an innovative solution: A high-precision two-dimensional displacement platform drives a single detection unit to scan the output face of the terahertz waveguide under test point-by-point, performing frequency scanning at each point and recording the power at each frequency point on each spatial coordinate. Through data synchronization and spatial gridding reconstruction algorithms, the time-series data is reconstructed into a spatially aligned three-dimensional data cube. Based on this three-dimensional data cube, a spatial and spectral resolution imaging (S²) mode decomposition algorithm is executed to decompose and reconstruct the mode field distribution, relative power, and group delay difference of each guided mode propagating in the waveguide. This method effectively solves the problem of a lack of area array detectors in the terahertz band and achieves low-cost, high-flexibility, and high spatial resolution terahertz waveguide mode analysis through a systematic data processing flow.

A transmission system according to the present invention comprises an optical splitter, an upstream-side optical fiber, an upstream-side optical transceiver, a plurality of downstream-side optical fibers, and a plurality of downstream-side optical transceivers. The optical splitter has a trunk section core and a plurality of branch section cores branched from the downstream-side end of the trunk section core. The upstream-side optical fiber is connected to the upstream-side end of the trunk section core. The upstream-side optical transceiver is connected to the upstream-side end of the upstream-side optical fiber. The plurality of downstream-side optical fibers are connected to the downstream-side ends of the corresponding plurality of branch section cores. The plurality of downstream-side optical transceivers are connected to the downstream-side ends of the corresponding plurality of downstream-side optical fibers. The trunk section core is a multimode optical waveguide for transmitting an uplink optical signal in a plurality of waveguide modes.

This invention provides a tolerance-based distance estimation method and system for dual-channel acoustic imaging in Arctic ice regions based on normal mode-constrained modes. The method includes: using a normal mode model to simulate and predict the frequency domain sound pressure, phase velocity, group velocity, and mode covariance matrix of the experimental sea area in the Arctic ice region; using Fast Fourier Transform (FFT) to transform the time-domain signal received by the vertical array in the ice region into frequency-domain data; obtaining the sound velocity and depth corresponding to the upper boundary, channel axis, and lower boundary of the Beaufort waveguide based on the dual-channel sound velocity profile of the experimental sea area; obtaining the order index of the Beaufort waveguide modes based on the intersection of the phase velocity dispersion curve with the sound velocity at the upper boundary and channel axis of the Beaufort waveguide; performing mode separation using a matched filtering mode filtering method to extract the modes confined in the Beaufort waveguide; and constructing a tolerance-based distance estimation operator for ice and seabed based on the extracted modes in the Beaufort waveguide to achieve tolerance-based estimation of underwater target distances.

The invention discloses a method for determining field distribution on any three-dimensional curved section in a coaxial line, and the method comprises the following steps: S1, constructing a parameterized coaxial line model under a cylindrical coordinate system, and determining a mapping point from a concentric ring at the bottom edge of the coaxial line to the inner curved section of the coaxial line; s2, when the voltage of an inner conductor of the coaxial line model is V0 and the voltage of an outer conductor is 0, calculating a field transmitted to a curved section by a mode field of any point of a concentric ring at the bottom edge; and S3, decomposing the field on the curved section into a surface differential vector direction to obtain field distribution of the three-dimensional curved section. According to the method, a two-dimensional classic shape can be expanded to a three-dimensional regular shape, and field distribution of any regular three-dimensional curved surface waveguide mode projected to a coaxial line reference section is obtained.

Systems and methods are provided for routing quantum signals in a quantum computing system. An exemplary method includes providing a waveguide configured to be coupled to at least two modules and a nonlinear element, the waveguide configured to facilitate exchange of quantum information between the at least two modules, the waveguide having at least two waveguide modes, each waveguide mode having a respective frequency; providing a first module couplable to the waveguide at a first module frequency corresponding to a first waveguide mode and a second module couplable to the waveguide at a second mode frequency corresponding to a second waveguide mode; and driving the waveguide via the nonlinear element at a difference frequency equal to a difference between the first module frequency and the second module frequency, thereby causing exchange of quantum information between the first and the second modules.

The application discloses an antenna and a wireless communication device. The antenna comprises a first metal body, the first metal body comprises N slots, and the N slots are determined according to a first parameter set. The first parameter set comprises at least one of the following parameters: a working frequency band of the antenna, a lowest-order waveguide mode corresponding to the N slots, a height H of the N slots, a side length P of the N slots, a filling medium, a desired transmission amplitude and a phase. The N slots correspond to N antenna units. According to the scheme, the antenna has a simple structure, is easy to process and install, and has good transmission performance.

A quantum cascade laser device according to the present disclosure comprises: a semiconductor substrate; a cascade laser region and a difference frequency waveguide laminated on the semiconductor substrate; and a grating coupling region. The grating coupling region is configured to couple, to a waveguide mode of the difference frequency waveguide, light emitted from the cascade laser region in a direction inclined with respect to an upper surface of the semiconductor substrate.

The application discloses a high-efficiency optical waveguide chip-few-mode fiber coupler. The coupler comprises a few-mode fiber-multimode waveguide mode spot conversion module on a low-contrast conversion chip, a polarization-insensitive mode multiplexing / demultiplexing module, a low-high-contrast waveguide mode spot conversion module and a polarization control module on a high-contrast chip. 2n linear polarization modes of the few-mode fiber are coupled into a multimode waveguide through the end face of the few-mode fiber-multimode waveguide mode spot conversion module, and then are demultiplexed into n base modes through the mode multiplexing / demultiplexing module, and then are coupled into n high-contrast waveguides through the low-high-contrast waveguide mode spot conversion module to obtain TE0 / TM0 mode pairs, and finally are divided into 2n linear polarization modes of the high-contrast waveguide through the polarization control module. The application can realize high-efficiency coupling of linear polarization modes in the few-mode fiber and linear polarization modes in the high-contrast optical waveguide chip, has the advantages of large bandwidth, large tolerance, low crosstalk, semiconductor process compatibility and the like, and effectively solves the problem of multimode coupling from the optical fiber to the chip.

The invention discloses a compact broadband circular waveguide TE01 mode bending structure, and aims to solve the technical bottleneck of the existing circular waveguide TE01 mode bending structure in the aspects of bandwidth and structure compactness. The antenna is composed of two circular waveguide TE01 mode power dividers, two H-plane U-shaped folded waveguide arrays and two H-plane rectangular bent waveguide arrays. A multi-path rectangular waveguide TE10 mode is adopted as a middle transition mode, and the problem of mode competition caused by direct bending of an over-mode circular waveguide in a traditional bending structure is effectively solved. Meanwhile, the H-plane U-shaped folded waveguide phase compensation technology is utilized to ensure that the lengths of transmission paths of the rectangular waveguides between the two circular waveguide TE01 mode power dividers are kept consistent, so that the relative working bandwidth of which the transmission efficiency of a bent structure is greater than 98% is widened to be more than 40%; and the power capacity is improved to GW magnitude under a vacuum condition, and the distance between input / output ports is shortened to be within 6 times of the central wavelength.

The invention discloses an on-chip orbital angular momentum mode generation method based on a sub-wavelength structure. The method comprises the following steps: step 1, designing an in-plane waveguide OAM mode generator; 2, generating and designing an OAM + / -1 mode in the waveguide; and step 3, generating and designing an OAM + / -2 mode in the waveguide. Based on superposition of several basic modes supported in the waveguide and independent of resonance of a specific wavelength, a calculation result shows that the transmission efficiency of the OAM + / -1 mode is always kept at 92% or above and the mode purity is always kept at a high level of 90% or above in an ultra-wide spectrum range from 1335 nm to 1800 nm, which means that the device can cover a plurality of communication wavebands to work and has a wide application prospect. And the information transmission capacity and the spectrum utilization rate of the system-on-chip can be improved. By designing a subwavelength space refractive index modulation light field structure which is finely optimized in the waveguide, high-quality generation of an OAM mode in an on-chip waveguide plane is realized.

The invention provides a low-loss and high-efficiency lithium niobate electro-optical modulator and a preparation method thereof, and belongs to the technical field of electro-optical modulators. The lithium niobate electro-optical modulator comprises a substrate, a cladding, a lithium niobate waveguide layer, an IHO electrode layer and a metal electrode layer which are sequentially stacked, and the IHO electrode layer is made of hydrogen-doped indium oxide. Through the arrangement of the IHO electrode layer, the low infrared loss can be ensured while the good conductivity is ensured, and the effective effect of an electric field on a waveguide mode is further reduced and the effective effect of the electric field on the waveguide mode is enhanced under the condition of controlling the loss, so that the same or deeper modulation depth can be realized under the low driving voltage; the electro-optical modulator has the advantages of low loss, high electro-optical modulation efficiency and low driving power consumption.

This disclosure provides a dual-step waveguide mode converter, comprising: a substrate (1), a lower cladding layer (2), a thin-film lithium niobate waveguide layer (3), a first dielectric loading layer (4), a second dielectric loading layer (5), and an upper cladding layer (6) arranged sequentially from bottom to top; wherein, the thin-film lithium niobate waveguide layer (3) comprises a plurality of waveguide segments connected in sequence, each waveguide segment being a straight waveguide of equal width and thickness, the width and thickness between adjacent waveguide segments decreasing abruptly along the optical transmission direction, and the centerlines of each waveguide segment being aligned; the first dielectric loading layer (4) is a silicon nitride layer covering the thin-film lithium niobate waveguide layer (3), and its refractive index is lower than that of the thin-film lithium niobate waveguide layer (3); the second dielectric loading layer (5) is a silicon oxynitride layer disposed above the first dielectric loading layer (4), and its refractive index is between that of the first dielectric loading layer (4) and the refractive index of the optical fiber core. This disclosure also provides a method for fabricating a dual-step waveguide mode converter.

This invention discloses a dual-input dual-output mode converter and its design method, relating to the field of micro-nano optoelectronic device technology. The device includes a silicon dioxide substrate, a top silicon layer, and a low-refractive-index cladding. The top silicon layer includes a first input waveguide, a second input waveguide, a mode conversion region, a first output waveguide, and a second output waveguide. The first and second input waveguides are connected to the first and second output waveguides respectively through the mode conversion region. The mode conversion region is divided into M×N rectangular units, which can be etched or unetched, with the etching depth being the same as the thickness of the top silicon layer. The state of the rectangular units is set by a quality factor. Based on reverse design, the device increases the mode conversion path within a limited size through reasonable division and calculation of the mode conversion region, achieving dual-input dual-output mode conversion functionality. This is of great significance for further improving the flexibility and integration of mode-division multiplexing systems.

The application provides a polarization rotation beam splitter based on a reverse taper coupler structure, the main structure of which is constructed by a first straight waveguide, a mode converter, a reverse taper coupler, a second straight waveguide, an S-shaped curved waveguide and a third straight waveguide, when mixed mode TE0 / TM0 light from an input end passes through the mode converter, TM0 mode light is rotated into TE1 mode light, and TE0 mode light does not change, TE0 / TE1 mixed mode light enters the input end of the waveguide group of the reverse taper coupler, and when passing through the waveguide group, TE1 mode is converted and coupled to the fourth tapered waveguide, and finally TE0 mode is output at the second output end of the polarization rotation beam splitter, and TE0 mode is not transformed and finally TE0 mode is output at the first output end of the polarization rotation beam splitter, so that the purpose of a simple polarization rotation beam splitter is achieved. Simulation results show that the application not only can solve polarization dependence, but also has the advantages of low loss, low crosstalk, large bandwidth, and small overall device size.

The invention relates to a waveguide structure generation method and device and an optical waveguide mode separation device, and the method comprises the following steps: constructing a preset waveguide structure which comprises a first waveguide layer; a main body part is defined in the first waveguide layer, the main body part extends in the first direction, the main body part comprises a first edge and a second edge which are oppositely arranged in the second direction, and the first direction intersects with the second direction; a plurality of preset boundary points are arranged on the first edge and the second edge respectively, and the preset boundary points located on the first edge and the preset boundary points located on the second edge cover the first edge and the second edge respectively; and performing shape optimization processing on the main body part based on the preset boundary point to generate a target waveguide structure. According to the waveguide structure generation method and device and the waveguide structure generated by the optical waveguide mode separation device, extremely low insertion loss can be kept in a wide working bandwidth range, crosstalk can be effectively suppressed, the overall size of the device is remarkably reduced, and the requirement for compactness of high-density photon integration can be met.