79 results about "Waveguide grating" patented technology

The invention provides a photon parallel matrix convolution operation chip which can be applied to the technical field of integrated photonics and optical calculation. The chip is integrated by a 1 * N array waveguide grating, a 1 * 2 beam splitter array, an input matrix modulator array, two N * 1 array waveguide gratings, two 1 * N beam splitters, a weight matrix modulator array, an M * M array waveguide grating detector array and a detector array. Main functional devices are integrated in a monolithic mode, the system is compact, the complexity and power consumption of the system can be effectively reduced, and the calculation efficiency is improved.

The invention discloses a polarization insensitive filter based on a sub-wavelength grating structure, and belongs to the technical field of integrated photonic devices. The filter comprises an input transition waveguide, a multimode waveguide grating and an output transition waveguide which are connected in sequence. The multimode waveguide grating is composed of a central sub-wavelength grating waveguide and Bragg gratings symmetrically distributed on the two sides, and the effective refractive indexes of TE polarization and TM polarization are equal by adjusting the waveguide width and duty ratio of the central sub-wavelength grating, so that the polarization sensitivity of the device is eliminated fundamentally. And the input / output transition waveguide adopts a transition mode of mixing a tapered waveguide and a sub-wavelength grating waveguide, so that low-loss mode transmission between a straight waveguide and a multimode grating is realized. According to the invention, the anisotropic equivalent medium characteristic of the sub-wavelength grating is utilized, a function of simultaneously and effectively filtering TE and TM polarization is realized, and the filter has the advantages of polarization insensitivity, flexible design, compact structure, simple process and compatibility with a CMOS (Complementary Metal Oxide Semiconductor) process, and has important application value in the fields of optical communication, optical interconnection and the like.

The invention relates to a waveguide grating, in particular to a method for manufacturing a waveguide grating with continuous gradually-changing groove depth, which comprises the following steps of: accurately measuring and calibrating ion beam current density distribution of a used ion beam in a working plane; establishing a cooperative control model associated with a target groove depth curve, ion beam current density distribution and scanning speed, associating the etching depth with the ion beam total dose, and accurately controlling the ion beam total dose received by each point on the waveguide grating by dynamically regulating and controlling the scanning speed of the substrate relative to the ion beam, so as to realize accurate control of the etching depth. The accurate control on the groove depth distribution is realized; based on the cooperative control model, the scanning speed corresponding to the target groove depth curve is solved by combining the set target groove depth curve and the calibrated ion beam current density distribution; and performing ion beam etching based on the solved scanning speed, and finally forming a continuous gradual change groove depth accurately corresponding to the target groove depth curve on the waveguide grating. The method can effectively overcome the defect that the high-precision waveguide grating with the continuous gradually-changing groove depth is difficult to manufacture.

The invention provides signal coding equipment, an imaging system and an imaging method. The signal coding equipment comprises an array waveguide grating, a coding optical fiber, a delay optical fiber and an optical splitter, the array waveguide grating is configured to convert an initial signal emitted by the light source into multiple paths of target signals; the optical splitter is configured to combine multiple paths of target signals and then emit the combined signals; a plurality of paths of coding optical fibers and a plurality of paths of delay optical fibers with different lengths are arranged behind the array waveguide grating, and each path of delay optical fiber is connected to the coding optical fiber of the corresponding coding sequence; the delay optical fiber is configured to delay a transmitted target signal, and the coding optical fiber is configured to perform pulse coding on the transmitted target signal. According to the invention, the original pulse signal is coded by using the sequence code with good orthogonality, so that the signal processing accuracy is improved. And the delay optical fibers are grouped, so that the corresponding channels in each group of channels can be simultaneously transmitted, the signal transmitting time is shortened, the signal processing efficiency is improved, and the point acquisition rate can be improved while the fuzzy distance is expanded.

The present application relates to the technical field of photolithography process, and more particularly to a kind of periodical scanning half-period optical waveguide grating preparation method, adopts multi-dimensional defect feature extraction and dynamic compensation algorithm, combined with the space-time synchronous modulation technology of light intensity distribution, significantly improves the defect masking efficiency;Through the multi-parameter collaborative optimization strategy under the closed-loop control architecture, the self-adaptive evolution mechanism of process parameters is formed, and the performance stability of grating structure under complex working conditions is guaranteed.The technical scheme innovates the whole process from light field modeling, motion control to defect repair, solves the common technical problems of grating period distortion and defect residue in the existing process, and provides a mass production solution for high-reliability grating devices for dense wavelength division multiplexing systems.

The invention discloses a topology protection Hong-Ou-Mandel interferometer based on a pi phase regulation and control grating, and belongs to the technical field of integrated photonics and quantum optics. The interferometer comprises a first waveguide and a second waveguide which are arranged side by side on a silicon dioxide substrate, and each waveguide comprises an input waveguide, a grating waveguide and an output waveguide. The two grating waveguides are provided with periodic notch grooves, and the positions of the notch grooves are symmetrically distributed about a waveguide center connecting line, so that a pi coupling phase difference is introduced between coupling in the two waveguides. The TE-TM coupling strength in the waveguides is enabled to be equal to the TE-TE coupling strength and the TM-TM coupling strength between the waveguides by adjusting the waveguide distance and the notch groove size, and the system enters a topological non-trivialness phase when delta phi is equal to pi, so that a compact topological boundary mode is formed. The structure provides an evolution path protected by topology for two-photon HOM interference, realizes interference visibility close to a theoretical limit, shows strong robustness for manufacturing errors and propagation distance changes, is obviously reduced in device size, and is suitable for high-density integrated quantum photon chips.

an optical intensity modulation device (100) comprising: an optical modulator (102) operative to modulate a continuous wave optical carrier signal at a carrier wavelength to generate one or more sidebands on the optical carrier signal; a radio frequency (RF) signal generator (104) operative to provide an RF drive signal to the optical modulator; a first optical waveguide grating (108) having a center reflection wavelength corresponding to the sidebands; and an optical circulator (106) configured to direct the optical carrier signal and the one or more sidebands into the first optical waveguide grating and to direct a reflected optical signal from the first optical waveguide grating towards an output to form an output optical signal, wherein the RF signal generator is operative to switch the drive signal on and off to form an intensity modulated output optical signal.

The utility model relates to the technical field of acoustics, and discloses an acoustic assembly comprising a waveguide grating, an internal mounting plate is fixedly connected in the waveguide grating, an internal clamping groove is arranged at the bottom of the waveguide grating, an internal clamping cover is clamped in the internal clamping groove, a filling block is fixedly connected in the internal clamping cover, and an external mounting plate is arranged in the internal clamping cover. A magnetic steel assembly is clamped in the waveguide grating, a limiting groove is formed in the bottom of the magnetic steel assembly, an acoustic assembly is clamped on the surface of the internal mounting plate, and a vibrating diaphragm is mounted at the top of the magnetic steel assembly. According to the utility model, through the arrangement of the diffusion members, the sensitivity of the soft material dome high pitch at the frequency band of 16000-20000 Hz is generally lower than that of other frequency bands, five groups of diffusion members corresponding to the frequency band of 16000-20000 Hz are arranged in front of the vibrating diaphragm, and the five groups of diffusion members form radians from the periphery to the center from large to small and correspond to the frequency band of 16000-20000 Hz, so that the sensitivity of the frequency band is effectively improved. The music performance of the high pitch of the soft ball top in the frequency band is obviously improved, and the installation work of the whole device is facilitated through the arrangement of the inner clamping groove.

The application discloses a dense optical fiber coding method based on an optical switch and a weak reflectivity grating string, and comprises the following steps: 1, a light source module emits a C-band pulse signal, and the signal contains optical pulses with different central wavelengths and overlapping in a time domain; 2, a weak reflectivity grating string is used to code each node to obtain different wavelength pulse combination types, and the coding signals of different coding nodes on the same link are spaced apart in the time domain; 3, the coding signal is injected into an array waveguide grating through an optical circulator, and is decomposed into more than one single-wavelength pulse signal; 4, a detector array and a collection card are used to carry out photoelectric conversion on the coding pulse signal, and the collected signal is output to an FPGA and an upper computer for processing and display; the problems that the prior art cannot be applied to realize real-time coding of a large-scale and high-reliability all-optical network and that the real-time coding scale is limited and cannot meet the use requirements of a large-scale network are solved.

Systems and methods for waveguide gratings with adhesive for waveguide-based displays. The waveguide displays as described herein comprise an adhesive material configured to protect the grating structures from contaminants. The waveguide display as described herein can be manufactured with an inkjet printer.

A coupling device for a multi-channel optical fiber array and a multi-layer arrayed waveguide grating, includes: a first clamping component and a second clamping component. A plurality of optical fibers that are spaced apart in an X-axis direction are connected on the first clamping component, each optical fiber extends in a Y-axis direction, and a plurality of arrayed waveguide gratings that are spaced apart in the X-axis direction are connected on the second clamping component. Each arrayed waveguide grating extends in the Y-axis direction, the optical fibers and the arrayed waveguide gratings are disposed in a one-to-one coaxial mapping manner, each arrayed waveguide grating is right-trapezoid-shaped, and beveled surfaces of any two arrayed waveguide gratings are located on a same plane. A wavelength division multiplexing technology is combined with a multi-channel parallel transmission technology.

The invention provides an all-optical fast Fourier transform calculation implementation method and a photonic device. The method comprises the following steps: demultiplexing a time sampling vector based on a first array waveguide grating to obtain a parallel multi-wavelength signal; carrying out column-by-column phase modulation on the parallel multi-wavelength signals according to a discrete Fourier transform matrix based on a phase shift waveguide array to obtain weighted signals; and combining the weighted signals based on the second array waveguide grating to obtain an output optical signal. According to the method provided by the invention, a parallel multi-wavelength signal is obtained by demultiplexing a time sampling vector based on a first array waveguide grating; carrying out column-by-column phase modulation on the parallel multi-wavelength signals according to a discrete Fourier transform matrix based on a phase shift waveguide array to obtain weighted signals; and on the basis of the second array waveguide grating, weighted signals are combined to obtain output optical signals, the physical characteristics of high selectivity and low loss of an integrated photonic device are fully utilized, and efficient and high-fidelity Fourier transform calculation is realized in an integrated form with low structural complexity.

Anti-counterfeiting is benefited by integrating both optical and digital encoding-decoding approaches for spoof protection, e.g., in print anti-spoofing. An optical-digital encoding-decoding system uses an encoded medium, such as a security label, to display images encoded with digital data, and a decoding device to decode or decrypt the digital data for achieving stronger authentication in anti-counterfeiting or other security-related purposes. The images are encoded into resonant waveguide gratings (RWGs) in the encoded medium, enabling angle multiplexing of the displayed images and addressing different secrecy requirements in optically handling different groups of security-related data. Furthermore, aperiodic diffraction gratings instead of periodic ones are used in RWGs for selected images intended to be viewed by users, broadening beamwidths of outgoing light beams generated by these RWGs to allow the selected images to be more conveniently viewed by the users over a wider range of angle.

The invention discloses a waveguide grating filter based on an optical phase change material and a filtering tuning method, the waveguide grating filter comprises a substrate, a buffer layer and a phase change material layer, a waveguide grating structure is defined in the phase change material layer through an external energy field, and the waveguide grating structure comprises a core waveguide and periodic lateral gratings arranged on the two sides of the core waveguide. According to the invention, the reversible phase change characteristic of a phase change material is utilized, and a tuning method of writing-erasing-rewriting is adopted: laser is selectively irradiated on a phase change material layer to form a crystalline waveguide grating structure; the crystalline region is recovered to be in an amorphous state through heating or laser scanning, so that erasing is realized; and flexible regulation and control of the spectral response of the filter are realized by writing structural parameters such as the tooth width, the duty ratio and the core waveguide size of the dynamic tuning grating again through laser. The filter works in a communication wave band of 1.5-1.6 microns, and has the outstanding advantages of reconfigurable structure, non-volatile property, flexible tuning, simple manufacturing and the like.

The invention relates to the field of integrated optics, and particularly provides an array waveguide grating, and the array waveguide grating comprises a first array waveguide which comprises a group of first transmission waveguides which are arranged at intervals, and each first transmission waveguide comprises a first sub-waveguide and a second sub-waveguide which are arranged at intervals in a signal transmission direction; the second array waveguide comprises a group of second transmission waveguides which are arranged at intervals, the first transmission waveguides and the second transmission waveguides are arranged in a one-to-one correspondence manner, and the thermo-optical coefficient of the second transmission waveguides is greater than that of the first transmission waveguides; the phase shifter array comprises a plurality of phase shifters, and the phase shifters and the second transmission waveguides are arranged in a one-to-one correspondence mode; optical signals are coupled and transmitted to the corresponding second transmission waveguides through the first sub-waveguides, phase modulation is carried out on the optical signals through the phase shifters, and the optical signals subjected to phase modulation are coupled and transmitted to the corresponding second sub-waveguides. The scheme can effectively reduce the insertion loss of the transmission waveguide and effectively improve the modulation efficiency.

The application discloses a multi-dimensional multiplexing modulation integrated photonic circuit of thin film lithium niobate, which comprises eight MRR type modulators, eight wavelength multiplexers based on reflective Bragg gratings, two polarization rotation beam splitters, a tapered waveguide based on a subwavelength waveguide grating and a double-polarization first-order mode multiplexer / demultiplexer. The photonic integrated circuit modulates input wavelength signals of λ0 and λ1, then wavelength multiplexes the signals by using reflective Bragg gratings with different working wavelengths, and then performs mode-polarization multiplexing, so as to realize the functions of wavelength, mode and polarization mixed multiplexing and signal modulation. The multi-dimensional multiplexing modulation integrated photonic circuit has the expandable characteristics of channels, and is expected to be used in optical interconnection to realize super-large capacity data transmission in an optical network.

An antenna device for performing off-chip light coupling comprising an array of radiating elements whose thickness is larger than λ / 2, the radiating elements being chosen such that the length of the array is smaller than 10λ, where λ is the wavelength of light in the material chosen for the radiating elements. An advantage of this method is that, unlike in conventional waveguide grating antenna, by reducing the number of the radiating elements in the array, the dependence of the off-chip emission angle on the wavelength of light can be greatly reduced. Another advantage is that by using thick radiating elements the antenna efficiency can be greatly enhanced, thereby compensating for the reduced efficiency occurring as a consequence of using only a small number of radiating elements in the array.

The invention provides a waveguide active integrated device. The waveguide active integrated device comprises a substrate, a waveguide layer, a modulator, a detector, a first reflector and a second reflector, the substrate comprises a lower cladding, a waveguide layer is arranged on the lower cladding, the waveguide layer comprises a silicon waveguide, and the silicon waveguide comprises a waveguide grating; the modulator and the detector are respectively arranged on the silicon waveguide; the first reflector is arranged in the lower cladding at the lower part of the waveguide grating, and the first reflector and the waveguide grating form a grating coupling structure; and the second reflector is arranged in the middle of the silicon waveguide on one side of the detector and is used for reflecting the signal light into the detector. The invention also provides a preparation method of the waveguide active integrated device. According to the invention, the reflector is prepared at the lower part of the waveguide grating to form a grating coupling structure, so that the intensity of incident light can be effectively improved; furthermore, a modulator and a detector are integrated in the device, and a reflector is arranged close to the detector, so that the detection efficiency of the detector can be further improved.

The present disclosure relates to a novel ultraviolet curing adhesive for an AR optical waveguide. The novel ultraviolet curing adhesive comprises the following components: 20-70 parts by weight of an acrylate oligomer or an acrylate monomer; 20-70 parts by weight of an active diluent, wherein the active diluent is isooctyl acrylate (IBOA); and 1-10 parts by weight of a catalyst, wherein the catalyst is selected from benzophenone and derivatives thereof, a hydrogen-abstraction type photoinitiator and a cleavage-type photoinitiator. The ultraviolet curing adhesive not only has a relatively low neat adhesive viscosity, which can meet the requirement of a relatively thin coating thickness for an AR optical waveguide grating, but also has high refractive index and transmittance and excellent optical characteristics and physicochemical properties, and particularly also has excellent structural formability and high structural fidelity that can reach over 94%.

The grating coupler (1) includes a first optical waveguide chip (20), a second optical waveguide chip (30), and a transparent component (40). The first optical waveguide chip (20) includes a first substrate (21), a first waveguide grating (25), and a first chip end face (20c). The second optical waveguide chip (30) includes a second waveguide grating (35) and a second chip top face (30a). The optical path of light in the wavelength range used by the grating coupler (1) is filled by the transparent component (40) between the first light incident and exit surface (20i) of the first optical waveguide chip (20) and the second light incident and exit surface (30i) of the second optical waveguide chip (30).

The application discloses an FP cavity electro-optic modulator array which can be used for a multi-wavelength channel transmitter. The modulator array is mainly formed by sequentially connecting N modulator units; a single modulator unit comprises a 2*2 Fabry-Perot cavity structure, a substrate and a pair of modulation electrodes, the 2*2 Fabry-Perot cavity structure and the modulation electrodes are arranged on the upper surface of the substrate, the two modulation electrodes are symmetrically distributed on the two sides of the 2*2 Fabry-Perot cavity structure, the multiplexing end of a first mode demultiplexer is connected with the input end of an anti-symmetrical multimode waveguide grating, the two anti-symmetrical multimode waveguide gratings are connected through an intermediate waveguide, and the output end of the other anti-symmetrical multimode waveguide grating is connected with the multiplexing end of the first mode demultiplexer. The application has the advantages of compact structure, excellent electro-optic modulation performance of the modulator unit, large modulation bandwidth, flexible cascade mode, can be used for the multi-wavelength channel transmitter, and is suitable for being applied to large-capacity optical communication, optical calculation and the like.

An optical waveguide comprises at least two TIR surface and contains a grating. Input TIR light with a first angular range along a first propagation direction undergoes at least two diffractions at the grating. Each diffraction directs light into a unique TIR angular range along a second propagation direction.

A chip structure and a semiconductor package including the same are provided. The chip structure comprises: a redistribution structure; an electronic integrated circuit chip on an upper surface of the redistribution structure; and a photonic integrated circuit chip including: a first substrate on an upper surface of the electronic integrated circuit chip and including an active surface and a non-active surface opposite the active surface; a first reflector on the non-active surface of the first substrate; and a first wiring structure on the active surface of the first substrate, where the photonic integrated circuit chip further includes a waveguide, a grating coupler, and a second reflector, and the patterned surface of the grating coupler faces the redistribution structure.

The present application relates to an array waveguide grating. The array waveguide grating comprises an input coupler, a waveguide array and an output coupler, wherein the waveguide array is coupled between the input coupler and the output coupler, and the waveguide array comprises a plurality of waveguides; the input coupler is used for allocating received optical signals to the plurality of waveguides, and the waveguides are used for guiding the allocated optical signals; and the output coupler is used for coupling the optical signals, which are transmitted on the plurality of waveguides. The input coupler has a first refractive index, each waveguide has a second refractive index, and the output coupler has a third refractive index, wherein the first refractive index and the third refractive index are both greater than the second refractive index. The array waveguide grating can solve both the problem of an insertion loss of a star coupler being relatively high and the problem of a phase error being relatively large due to the roughness of a side wall of a waveguide, and insertion loss of the array waveguide grating is relatively low.

The utility model discloses a passive large-view-field silicon-based optical phased array which comprises a silicon substrate, a silicon dioxide buried oxide layer and a silicon nitride layer. The silicon nitride layer comprises an inverted-cone-shaped coupling waveguide, an optical beam splitting module, a phase delay module and a waveguide grating antenna module, the inverted-cone-shaped coupling waveguide is used for coupling input light into the optical beam splitting module, and the optical beam splitting module is used for equally dividing an optical signal generated by the input light into N paths of sub optical signals with equal power, the phase delay module comprises an n-shaped waveguide array and a sine-type waveguide array, the n-shaped waveguide array is used for carrying out phase regulation and control on each path of sub-optical signals, the sine-type waveguide array is used for reducing waveguide spacing, and the waveguide grating antenna module is used for radiating light energy output by the sine-type waveguide array. According to the optical phased array, the phase does not need to be changed through electric tuning or thermal tuning, and meanwhile large-view-field scanning of the optical phased array can be achieved after the optical phased array passes through the sinusoidal waveguide array arranged compactly.

The application discloses a kind of parallel phase calibration methods for waveguide grating antenna of multiple scanning angles, the method includes: the light of one-dimensional waveguide grating antenna exit with M units is received by receiving screen placed in far field, and far field image is photographed using camera;N detection points of different scanning angles are set on far field image;Select one-dimensional waveguide grating antenna arbitrary unit m as control object, to the control voltage of step to make the phase of unit m exit light change from 0 to 2pi, the control voltage corresponding to the maximum energy of detection point at different scanning angles is regarded as the calibration voltage of grating antenna unit m at different scanning angles.The application realizes the parallel calibration of waveguide grating antenna control voltage of different scanning angles by the way of voltage cyclically applied to each waveguide grating antenna, and greatly improves the calibration efficiency of waveguide grating antenna phase.

Optical intensity modulation apparatus including: an optical modulator operative to modulate a continuous-wave optical carrier signal at a carrier wavelength to generate at least one sideband on the optical carrier signal; a radio frequency, RF, signal generator operative to provide an RF drive signal to the optical modulator; a first optical waveguide grating having a central reflection wavelength corresponding to a sideband; and optical circulator configured to direct the optical carrier signal and the at least one sideband to the first optical waveguide grating and to direct a reflected optical signal from the first optical waveguide grating towards an output to form an output optical signal. The RF signal generator is operative to switch the drive signal on and off so as to form an intensity modulated output optical signal.

A holographic optical waveguide and a sight, relating to the technical field of optics. A hologram and a holographic waveguide grating are integrated on one element, and optical waveguide transmission characteristics and grating diffraction characteristics are used to achieve an aiming function by means of one optical element, thereby improving the assembly precision of the holographic optical waveguide, reducing the assembly difficulty, and improving the assembly yield. An optical waveguide is added to a conventional hologram, waveguide light transmission characteristics are used to replace conventional geometric optics, and light transmission is implemented by means of refraction and reflection by the optical element, thereby achieving a smaller volume and higher precision. The optical waveguide is provided with an in-coupling waveguide holographic grating and an out-coupling waveguide holographic grating, so that chromatic aberration correction can be performed on a wavelength, and therefore the imaging effect is better than that of conventional monolithic gratings. In addition, a light beam is totally reflected in a substrate and transmitted to the out-coupling waveguide holographic grating, thereby reducing transmission, reducing energy loss, improving the light effect, enabling human eyes to clearly observe reticle information on the hologram, and improving user experience.

Gradient encapsulation of waveguide outcoupler gratings to control diffraction efficiency and directionality.SOLUTION: The device includes a first grating formed over a substrate, the first grating having a plurality of first structures extending away from the substrate, the first grating corresponding to an out-coupler. The device includes a first encapsulant disposed in one or more gaps formed between adjacent first structures, wherein a fill ratio of the first encapsulant decreases along the first grating. A method of manufacturing the device is also described.SELECTED DRAWING: Figure 1B

This invention discloses a laser alarm, comprising an optical receiving system, an optical scanning system, an optical switch, an optical amplification system, a wavelength division detection system, and a signal processing system. The optical system receives incoming laser light and transmits it to the optical scanning system. The optical scanning system uses a micro-mirror to perform the scanning. After passing through the optical switch, visible light signals directly enter the wavelength division detection system, while near-infrared light signals are amplified before entering the system. In this design, the optical switch, optical amplification system, and wavelength division detection system are integrated onto a single silicon photonic chip, including a silicon-based waveguide switch, a silicon-based waveguide amplifier, an arrayed waveguide grating, and a silicon-based photodetector. The signal processing system is connected to the micro-mirror chip and the silicon-based photodetector acquisition card. This invention achieves miniaturization of the laser alarm, enabling rapid detection of threatening laser signals and acquisition of laser azimuth and wavelength information, with high directional accuracy and a low false alarm rate.