173 results about "Waveguide mode" patented technology

The present application provides a method for pipeline defect detection using the magnetostrictive characteristics of ultrasonic guided waves, which relates to the technical field of pipeline defect detection, including: obtaining the geometric and material parameters of multi-layer heterogeneous pipelines, and establishing a mathematical model of the pipeline; according to the mathematical model, calculating the dispersion curve and modal characteristics of ultrasonic guided waves in the pipeline; selecting a suitable excitation frequency and guided wave mode, and optimizing the detection parameters of ultrasonic guided waves; presetting defects of different types and sizes in the pipeline, and analyzing the influence of defects on guided wave propagation characteristics through numerical simulation; building a multi-layer heterogeneous pipeline ultrasonic guided wave detection experimental system, collecting guided wave signals under different defect conditions, and extracting time-frequency domain characteristic parameters. The present invention can realize the effective detection and evaluation of internal defects of multi-layer heterogeneous pipelines at different temperatures, and provides an important technical means for ensuring the safe operation of pipelines.

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.

A waveguide antenna system, includes: an electromagnetic, EM, transition portion having a transition region having a signal feed interface and an open waveguide section, the EM transition portion configured to couple EM energy from the signal feed interface to a guided waveguide mode of EM energy to the open waveguide section via the transition region; and a leaky waveguide antenna portion configured and disposed to radiate electromagnetic energy received from the open waveguide section; wherein the EM transition portion is electromagnetically coupled to the leaky waveguide antenna portion, the EM transition portion being configured to support a transfer of electromagnetic energy from a signal feed structure to the leaky waveguide antenna portion.

Phase-change metasurface waveguide mode converters and photonic computing systems including a phase-change metasurface waveguide mode converter are described. In an embodiment, the phase-change metasurface waveguide mode converter include a plurality of phase-change antennas comprising a phase-change material and protruding from a surface, wherein each phase-change antenna of the plurality of phase-change antennas is configured to scatter an optical waveguide mode and cause a phase shift of light travelling through an optical waveguide optically coupled thereto. In an embodiment, the phase-change metasurface waveguide mode converter includes the plurality of phase-change antennas configured to alternate between a crystalline phase and an amorphous phase.

The invention discloses a method for jointly detecting corrosion defects of a pressure pipeline by utilizing multiple guided wave modes, relates to an ultrasonic non-destructive testing technology, and is used for solving the problem that the accuracy is relatively low when a single guided wave mode is used for detecting. The method for detecting the corrosion defect of the pressure pipeline comprises the following steps: calculating ultrasonic guided wave dispersion data of the pressure pipeline, and determining the center frequency of a transducer according to the dispersion data; the method comprises the following steps: arranging ultrasonic transducer annular arrays on two sides of a to-be-detected pressure pipeline, and acquiring ultrasonic guided wave data detected by the pressure pipeline in an L (0, 1) mode and a T (0, 2) mode; preprocessing the array waveform data to obtain detection data which can be used for guided wave imaging; according to the L (0, 1) mode guided wave data, a full waveform inversion method is adopted to invert the wall thickness of the pipeline corrosion defect; judging whether the pipeline defect exceeds the detection depth range of the T (0, 2) mode, and if the pipeline defect exceeds the detection depth range, ending; and if not, inverting the wall thickness of the pipeline corrosion defect by adopting a full-waveform inversion method according to the T (0, 2) mode guided wave data.

The invention discloses a metasurface-based rectangular-circular waveguide mode conversion device and a metasurface-based rectangular-circular waveguide mode conversion method, which are used for realizing TE10-TE20-TE01 metal waveguide mode conversion, and comprise a first section of waveguide, a second section of waveguide, a third section of waveguide, a fourth section of waveguide, a fifth section of waveguide, a first metasurface structure and a second metasurface structure, wherein the first, third and fifth sections of waveguides are respectively used for transmitting a rectangular waveguide TE10 mode, a rectangular waveguide TE20 mode and a circular waveguide TE01 mode, and the second and fourth sections of waveguides are used for generating multimode interference; the first metasurface structure is used for realizing conversion from a TE10 mode to a TE20 mode, and the second metasurface structure is used for realizing conversion from the TE20 mode to a TE01 mode; the second section of waveguide, the first metasurface structure and the third section of waveguide form a TE10-TE20 mode converter; and the fourth section of waveguide and the second metasurface structure form a TE20-TE01 mode converter. By utilizing the regulation and control capability of the metasurface on the electromagnetic field, the rectangular waveguide TE10 mode can be converted into the circular waveguide TE01 mode in a relatively small space.

To provide a light receiving element for optical communication superior in polarization distinctiveness, wavelength separability, high-speed responsiveness, and thinning.SOLUTION: A light receiving element for optical communication comprises: a semiconductor layer or a dielectric layer; a semiconductor light absorption layer that is formed on the semiconductor layer or the dielectric layer; a short wavelength infrared transparent layer that is formed on the semiconductor light absorption layer; and a metal diffraction grating that is formed on the short wavelength infrared transparent layer. Short wavelength infrared light incident from an upper direction of the metal diffraction grating made incident, a period p of the metal diffraction grating is set so that a surface plasmon resonance wave is excited on a boundary surface between the metal diffraction grating and the short wavelength infrared transparent layer by the short wavelength infrared light. A thickness of the semiconductor light absorption layer is set so that the period p of the metal diffraction grating and a waveguide mode transmission wavelength β in which the three layers (the semiconductor layer or the dielectric layer, the semiconductor light absorption layer, and the short wavelength infrared transparent layer) are regarded as a clad core light waveguide path satisfy a condition of β=p*0.9 to 1.1.SELECTED DRAWING: Figure 1

The invention discloses a high-precision light column display method and system based on a liquid crystal variable refractive index, and the method comprises the steps: generating a multi-dimensional driving signal with a spatial gradient characteristic according to a preset spatial distribution parameter of a target light column, and carrying out the coupling regulation and control of the voltage amplitude and frequency of the multi-dimensional driving signal, the molecular arrangement state of the liquid crystal electro-refractive index adjusting layer is dynamically changed, and a refractive index gradient field matched with the axial phase distribution requirement of the light column is established. Through a waveguide mode-phase field discretization cooperative mapping mechanism and a double-loop dynamic anti-interference architecture, real-time generation of a high-resolution light beam and stable transmission in a complex environment are realized without a mechanical scanning part, and high precision and strong robustness are achieved.

Provided are polarization-mode controlled nonreciprocal optical waveguide devices, which are used in optical isolator and optical circulator devices. These devices offer a solution to the issues associated with traditional planar optical waveguide-based optical isolators, which are specific to a single polarization mode and result in significant optical loss. The new devices implement polarization-insensitive operation with minimal optical loss. They feature a magneto-optic (MO) film clad on one side and utilize waveguide mode converters or polarization-mode converters to guide the input light signals' mode or polarization. This reduces optical loss as the light passes through the interface between the non-MO clad region and the MO clad region and maximizes the MO effect within the MO clad region by ensuring proper polarization mode.

The invention discloses a compact type broadband circular waveguide TM01-TE01 mode converter, and relates to a TM01-TE01 mode converter. The antenna is composed of a circular waveguide TM01 mode power divider, N rectangular waveguide polarization bending structures and a circular waveguide TE01 mode synthesizer, and the circular waveguide TM01 mode power divider, the N rectangular waveguide polarization bending structures and the circular waveguide TE01 mode synthesizer are symmetrically arranged in a central rotation mode along a central axis. The circular waveguide TM01 power divider is composed of an input circular waveguide, an arc chamfer structure, a disc waveguide, an H-surface disc-shaped output structure and a circular-truncated-cone-shaped matching structure. The rectangular waveguide polarization bending structure is composed of two E-plane rectangular bent waveguides and a rectangular waveguide. And the circular waveguide TM01 mode power divider and the circular waveguide TE01 mode synthesizer are rotationally staggered by Psi along the central axis. The circular waveguide TE01 synthesizer is composed of an output circular waveguide, a second arc chamfer structure, a second disc waveguide, an E-surface disc-shaped input structure and a conical matching structure. The power capacity and the transmission efficiency are high, the axial size is small, and the relative working bandwidth with the transmission efficiency larger than 95% is wide.

The invention discloses a balanced frequency tripling structure and terahertz equipment, which are applied to the technical field of terahertz, and comprise an odd-mode excitation structure connected with an input waveguide, a waveguide mode excitation structure connected with an output waveguide, and two coupling lines connected with the odd-mode excitation structure and the waveguide mode excitation structure, the two coupling lines are arranged in parallel to transmit differential signals; one coupling line is connected with a frequency doubling diode, the other coupling line is connected with another frequency doubling diode, and the two frequency doubling diodes form a balanced frequency doubling diode pair. Through the odd-mode excitation structure, electromagnetic waves can be converted into coupling line odd-mode work, so that radio frequency reverse excitation is carried out on the two frequency doubling diodes, and basic conditions for realizing idle harmonic suppression are constructed. And meanwhile, the odd mode excitation structure and the waveguide mode excitation structure can lock even harmonics generated by the frequency doubling diode in a nonlinear manner in the coupling line to form a high-integration-level idle harmonic loop, so that high efficiency of third harmonics can be ensured.

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.

Provided are an optical alignment device and an optical alignment method. The optical alignment device includes an input optical fiber, a light source provided at one terminal of the input optical fiber to generate input light, an input stage provided at another terminal of the input optical fiber, an output stage spaced apart from the input stage, a stage driving control unit configured to control driving of the input and output stages, a camera configured to receive output light generated from the input light by the waveguide chip and detect a waveguide mode, an output optical fiber having one terminal connected to the output stage, an optical power meter configured to detect an intensity of the output light, and a system controller configured to determine the waveguide mode and the intensity of the output light.

An optical filter (10) according to the present disclosure comprises: a core part (13) that is covered with a cladding part (16), extends in one direction (z), and can propagate light in a plurality of waveguide modes; and a satellite part (17) that is covered with the cladding part (16), extends in the one direction (z) while separated from the core part (13), has a higher effective refractive index than the cladding part (16), and is smaller than the minimum possible size of an optical material capable of propagating light in a single mode.

The invention discloses a method for exciting a nano-cavity at a small angle by utilizing an anti-resonance hollow-core optical fiber waveguide mode, which comprises the following steps of: injecting a solution containing a gold micron sheet into an anti-resonance hollow-core optical fiber, and coupling metal nano-particles adsorbed on the surface of the gold micron sheet with the gold micron sheet to form the nano-cavity; the super-continuous light is coupled into the anti-resonance hollow-core optical fiber through the lens group, and resonance of the nano-cavity is excited in a waveguide mode of the anti-resonance hollow-core optical fiber. Due to the ultra-low numerical aperture characteristic of the anti-resonance hollow-core optical fiber, super-continuous light coupled into the anti-resonance hollow-core optical fiber excites a nanocavity at an angle approximately parallel to the optical fiber, which is difficult to realize under the excitation of spatial light. The method for exciting the nano-cavity at a small angle by using the anti-resonance hollow-core optical fiber, which is realized by the method, has the characteristics of small size and simple structure, is beneficial to research on optical characteristics of the nano-cavity, and is expected to be applied to the fields of anti-resonance hollow-core optical fiber biosensing and the like.

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 invention belongs to the technical field of integrated photonic devices, and particularly relates to an electric tuning silicon nitride waveguide multimode interference coupler based on a two-dimensional material covering layer. In order to solve the problem that an existing silicon nitride photonic device lacks effective electro-optical regulation and control capacity, a two-dimensional material covering layer (such as molybdenum disulfide and tungsten disulfide) is integrated on the surface of a silicon nitride waveguide, and an up-and-down structure of a metal electrode-two-dimensional material-silicon dioxide cladding-silicon nitride waveguide is constructed. When external bias voltage is applied, the effective refractive index of the waveguide mode is changed through evanescent field coupling by means of the electrical refraction effect of the two-dimensional material, and active regulation and control of the optical path of the silicon nitride waveguide without the thermo-optic effect are achieved. Compared with a lithium niobate-silicon nitride heterogeneous integration scheme, the two-dimensional material with the atomic layer thickness is compatible with the CMOS technology, a complex heterogeneous bonding technology is not needed, and the advantage of monolithic integration is achieved. The device is particularly suitable for a reconfigurable optical signal processing device in a silicon-based photon integrated circuit.

The invention relates to the technical field of devices for light modulation, and discloses a graphene all-optical modulator and application thereof. The graphene all-optical modulator comprises a thin silicon groove waveguide, a mode converter unit and a silicon dioxide substrate, and the thin silicon groove waveguide and the mode converter unit are located on the silicon dioxide substrate. The two sides of the thin silicon groove waveguide are respectively connected with a group of mode converter units, and the two groups of mode converter units are symmetrically distributed on the two sides of the thin silicon groove waveguide; and the thin silicon groove waveguide is covered with a graphene-hexagonal boron nitride heterojunction. Compared with the prior art, the all-optical modulator has the advantages that interaction between light and substances can be effectively enhanced, efficient all-optical modulation is achieved, meanwhile, the all-optical modulator has ultrafast response time and broadband modulation capacity, new possibility is provided for development of optical communication and optical information processing technologies, and the all-optical modulator is of great significance to development of ultrafast low-energy-consumption silicon-based optoelectronic chips.

The optical touch module comprises the following components: a light source, a first grating, a second grating, an optical waveguide layer, a photoelectric detector array and a signal processing module, a first grating and a second grating with different vector directions are arranged on the optical waveguide layer; the light source emits incident light with a specific wavelength, and the diffraction angle of diffraction light of the incident light in the first grating and the second grating in the air is larger than 90 degrees. The light source is incident on the optical waveguide layer to form a light spot, and the light spot covers the first grating and the second grating; diffracted light is coupled into the optical waveguide layer by the first grating and the second grating to form two waveguide modes in different directions, and the diffracted light is transmitted to the side edge of the optical waveguide layer to form at least four light current points which are received by the photoelectric detector array arranged on the side edge; the signal processing module calculates the position of an incidence point of the light source on the optical waveguide layer according to the position of an electric signal of the photoelectric detector array, and finally completes optical interaction with incident laser as a signal. The design that the vector directions of the first grating and the second grating point to the long side of the optical waveguide layer enables light to be propagated at a certain angle in the short side direction of the optical waveguide layer, propagation paths can be reduced, optical waveguide transmission loss can be reduced, the electric signal strength is improved, and therefore the touch size is increased under the conditions of the same laser signal strength and the same detector.

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.

In a general aspect, a radio frequency (RF) measurement device includes first and second mode converters, each configured to convert a mode of the RF electromagnetic wave between a first RF waveguide mode and a second RF waveguide mode. The RF measurement device also includes an internal cavity between the first and second mode converters that contains a vapor or a source of the vapor. The vapor includes Ryberg atoms or molecules. The RF measurement device additionally includes an RF waveguide extending between the first and second mode converters and configured to carry the second RF waveguide mode through the internal cavity. In some variations, the RF waveguide includes first and second longitudinal portions disposed on respective, opposite sides of the device and configured to establish a target RF profile in an interaction region of the internal cavity.

The present invention discloses a broadband, high-efficiency circular waveguide TE31 mode exciter, belonging to the field of microwave and millimeter wave technology. The exciter comprises a standard TE10 mode rectangular waveguide section, a TE10 mode-TE30 mode conversion section, a standard TE30 mode rectangular waveguide section, a TE30 mode-TE31 mode conversion section, and a TE31 mode circular waveguide section, all connected in sequence. The excitation process of the TE31 mode exciter is divided into two steps: first, converting the TE10 mode to the TE30 mode, and then converting it to the TE31 mode. With the cooperation of a power divider, a torsion waveguide, and a gradient waveguide, the conversion from the rectangular waveguide TE10 mode to the circular waveguide TE31 mode is achieved, reducing losses during the conversion process and ensuring conversion efficiency.

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.

Disclosed in the present invention are a miniaturized time phase decoder based on a planar optical waveguide chip and a QKD receiver. All on-chip devices are manufactured on the basis of a PLC process, an arm length difference of an interferometer can be accurately controlled by means of an existing process, and interference stability maintenance does not need to be carried out on devices such as a phase shifter or a phase modulator built in an interference ring; except an external single-photon detector, all functional devices are passive devices and have relatively high stability and reliability; moreover, because a PLC planar optical waveguide mode can be basically consistent with a mode in an optical fiber, the polarization state does not need to be specially controlled before coupling into a chip, the requirements on devices such as an external polarization controller are reduced, and the size of a QKD receiver is further reduced.

The invention relates to the technical field of electromagnetism, in particular to a multi-layer slab waveguide mode processing method, device, equipment, medium and program, and the method comprises the steps: constructing a transfer matrix model of a multi-layer slab waveguide; obtaining boundary conditions of the infinite space, and determining a corresponding real number domain characteristic equation and a complex number domain characteristic equation according to the transfer matrix model and the boundary conditions so as to determine a guided mode and a leakage mode of the multilayer slab waveguide in the infinite space; introducing a perfect matching layer to convert a radiation condition of an infinite space into an absorption boundary in a finite computational domain, constructing a finite space characteristic equation according to the thicknesses of the perfect matching layer and the absorption boundary, and positioning a plurality of correction leakage modes according to the finite space characteristic equation to generate a Bereger mode; and generating complete mode distribution according to the guided mode, the leakage mode and the Bereger mode. Therefore, the problems of relatively poor calculation precision, relatively slow calculation speed, limitation of complete mode solving in the multilayer slab waveguide and the like in related technologies are solved.

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 discloses a broadband circular waveguide TE01 mode exciter based on a crossed ridge waveguide, and relates to the technical field of microwaves. The exciter comprises a rectangular waveguide four-path power division feed structure for dividing the power of a TE10 mode into four paths, a crossed ridge waveguide TE22 mode forming structure for synthesizing the four paths of TE10 modes into a crossed ridge waveguide TE22 mode, and a circular waveguide TE01 mode forming structure for converting the crossed ridge waveguide TE22 mode into a circular waveguide TE01 mode. By introducing the crossed ridge waveguide structure, the directional regulation and control of waveguide dispersion are realized, and the cut-off frequency interval between a working mode and a parasitic mode is remarkably improved, so that the bandwidth is expanded. A crossed fan-shaped structure is introduced to serve as a middle structure of the crossed ridge waveguide and the circular waveguide, the cut-off phenomenon caused by sudden change of the waveguide shape is avoided, and the working bandwidth is further expanded. The high-purity and high-efficiency broadband filter has the advantages of being high in purity, high in efficiency, wide in frequency band and high in compactness, meanwhile, the structure is simple, machining and assembling are easy, and good engineering practicability is achieved.

The present invention discloses an optical gyroscope integrated chip based on a thin-film lithium niobate photonic integrated platform. The overall structure adopts a hybrid curved waveguide with multiple parts of continuously variable curvature, which reduces the insertion loss caused by the mode field mismatch between the straight waveguide and the curved waveguide at the junction, reduces the excitation of high-order modes, and helps to reduce the overall size of the chip. In addition, the curved waveguide increases the polarization extinction ratio of the chip and filters out quasi-TE 00 The present invention utilizes waveguide mode leakage to achieve single-mode, single-polarization operation of the lithium niobate waveguide. The single-TE mode lithium niobate waveguide on the entire chip, excluding the curved waveguide of the folded modulator and the coupler, forms a waveguide polarizer with a high polarization extinction ratio. This allows on-chip single-mode, single-polarization operation to be achieved without the need for an additional polarizer design, effectively reducing chip complexity, improving chip stability, and reducing chip size.

This invention discloses a broadband, low-loss TE10-TE20 mode converter, belonging to the field of millimeter-wave device technology. It includes a cuboid matching structure, a bed-of-nails structure, and an input E-plane rectangular waveguide, a tapered waveguide, and an output H-plane wide waveguide connected sequentially along a common bottom surface. The mode converter is divided into an upper cavity and a lower cavity along the upper bottom surface of the output H-plane wide waveguide. The input E-plane rectangular waveguide is divided into two halves, located in the upper and lower cavities respectively. The tapered waveguide includes a tapered height reduction waveguide and a tapered widening waveguide located in the upper and lower cavities respectively. The cuboid matching structure is located on the symmetry axis of the lower bottom surface of the tapered widening waveguide and is adjacent to the output H-plane wide waveguide. The bed-of-nails structure is located on both sides of the tapered widening waveguide and the output H-plane wide waveguide, outside the connection point between the input E-plane rectangular waveguide and the tapered widening waveguide. This invention effectively expands the operating bandwidth of the mode conversion, shortens the path length, and has the advantages of simple and compact structure, easy assembly, broadband operation, and low loss.

To provide an optical filter which offers both temperature independence of an operating wavelength and high integration of optical circuitry, and to provide a wavelength locker device.SOLUTION: An optical filter disclosed herein comprises a core portion covered with a cladding and configured to extend in one direction to enable propagation of light in multiple waveguide modes, and satellite portions covered with the cladding and configured to extend in the one direction apart from the core portion and to have a higher effective refractive index than that of the cladding, the satellite portions being smaller than a minimum size of an optical material capable of propagating light in a single mode.SELECTED DRAWING: Figure 1