117 results about "Waveguide grating" patented technology

Gradient encapsulation of waveguide outcoupler gratings for control of diffraction efficiency and directionality 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 outcoupler. The device includes a first encapsulant disposed in one or more gaps formed between adjacent first structures, where a fill ratio of the first encapsulant decreases along the first grating. Also described herein are methods for fabricating the device.

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.

Distances between photonic integrated circuits and multiport optical probes can be established by emitting an optical beam from a first optical port of the multiport optical probe so that the optical beam is coupled into a first waveguide section of a PIC. This optical beam portion is reflected from a surface of the multiport optical probe back to the PIC. At suitable PIC-probe distances, the optical beam is coupled by a second waveguide grating to propagate in a second waveguide section and is then emitted to a second optical port of the multiport optical probe by a third waveguide grating coupler and directed to a detector. The detector signal is used to determine or adjust PIC-probe separation.

The invention discloses an oil and gas pipeline sand content test sound wave optical fiber sensor, and particularly relates to the technical field of sensors, which comprises a rare earth doped silicon dioxide optical waveguide sheet, a vibration transduction structure, a phase shift waveguide grating and a phase shift wave. The device further comprises a photoelectric converter, a signal amplifier, a filter, a fragrance clamping filter and a vibration signal detector. The rare earth doped silicon dioxide waveguide sheet is located on the vibration transduction structure, and the phase shift waveguide grating is inscribed in the rare earth doped silicon dioxide waveguide sheet. The micro-vibration optical chip sensor based on the photoacoustic spectrum is simple and firm in structure, easy to manufacture and convenient to integrate with other systems, and the problem of integration of a traditional optical fiber distributed sensing system can be effectively solved.

The invention discloses a waveguide grating for realizing diffraction efficiency gradual change, a preparation method and equipment. And the grating depth and the duty ratio are monotonically increased along the etching direction, so that the spatial gradient distribution of the diffraction efficiency is obtained. The method comprises the following steps of: firstly, forming periodic photoresist stripes on a substrate by utilizing an interference photoetching technology to obtain an initial grating pattern; and then, the substrate is placed in a plasma etching system, and the depth and duty ratio of the grating are monotonically increased along the etching direction by regulating and controlling the etching time or etching rate of different areas, so that the spatial gradient distribution of diffraction efficiency is realized. The waveguide grating disclosed by the invention effectively compensates attenuation of light in a waveguide transmission process, and the uniformity and imaging quality of AR display application and the like are remarkably improved. The problem of uneven brightness caused by light energy transmission attenuation of the waveguide grating in the prior art can be effectively solved, the manufacturing cost is low, the process expandability is high, and the waveguide grating is suitable for various waveguide optical display scenes such as mixed reality (MR) and virtual reality (VR).

A waveguide grating coupler (WGC) for coupling light transmitted between an integrated optical waveguide and an optical fiber and a method for making the waveguide grating coupler are provided. The waveguide grating coupler working for dual polarization includes a grating layer having a first plurality of etched holes and an overlay layer disposed on the grating layer, having a second plurality of etched holes. At least one of the second plurality of etched holes partially overlaps a corresponding etched hole of the first plurality of etched holes. The overlay layer is configured to create a shift of every period of grating to the grating layer to achieve upwards constructive interference and downwards destructive interference of light such that coupling efficiencies of both vertical grating coupling and angle coupled grating coupling are enhanced for a single mode optical fiber, a few mode optical fiber, or a multi-mode optical fiber.

The invention relates to a 3 [mu] m SOI-based polarization insensitive waveguide grating antenna for optical sensing. The waveguide grating antenna provides a substrate and a ridge waveguide located above the substrate; grating teeth are formed on the upper surface of the ridge waveguide through shallow etching; slab areas on the two sides of the ridge waveguide are provided with deep etching which is etched to the buried oxide layer. The OPA transmit-receive system introduced in the invention has high diffraction efficiency (gt; 70%), which is far greater than 50% emission efficiency of a conventional fishbone-shaped antenna; polarization is insensitive, and inherent loss of a polarization controller in the system can be eliminated; and the beam divergence is small (less than 0.01 degree), and the method has a good application prospect.

The invention discloses a calculation spectrometer based on a random multimode waveguide grating and a spectrum reconstruction method. Comprising a silicon substrate layer, a silicon dioxide buried oxide layer, a lithium niobate waveguide layer, a silicon dioxide coating layer and an interdigital electrode which are sequentially stacked from bottom to top, a mode multiplexer, a multi-mode waveguide spiral line and multi-mode waveguide gratings are formed on the lithium niobate waveguide layer, the mode multiplexer is communicated with the multi-mode waveguide spiral line, the multi-mode waveguide spiral line at least comprises a section of multi-mode straight waveguide, a plurality of non-periodically distributed multi-mode waveguide gratings are arranged on the multi-mode straight waveguide, and the multi-mode waveguide gratings are arranged on the multi-mode straight waveguide. And each multimode waveguide grating unit adopts a Bragg grating structure and comprises two groups of grating tooth structures which are respectively positioned on two sides of the multimode straight waveguide. According to the invention, the electrical control logic can be simplified, the disordered resonance of different modes in the spiral line can provide high spectral reconstruction resolution, and meanwhile, the lithium niobate electro-optical modulation can realize rapid and low-power consumption measurement channel scanning.

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 invention discloses a distributed feedback laser array line width narrowing device and method based on self-injection feedback, and the device is characterized in that a laser array is connected with an array waveguide grating, the array waveguide grating is connected with an optical fiber circulator, and the optical fiber circulator is connected with an optical fiber coupler; the output of the laser array is combined through the array waveguide grating and then input into the optical fiber circulator, part of laser entering the optical fiber coupler from the optical fiber circulator passes through the optical fiber circulator and the array waveguide grating again and is injected into the laser array in the form of optical feedback, and the working state of the laser array is influenced by the optical feedback. And the line width of the laser array is narrowed. Through the synergistic effect of the laser array, the array waveguide grating, the optical fiber circulator and the optical fiber coupler, a self-injection feedback loop is constructed, part of output laser is re-injected into the laser unit after wave combination and light splitting, and phase noise is suppressed through optical feedback, so that the linewidth is remarkably reduced.

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 present application discloses a silicon-on-insulator array waveguide grating chip for dense wavelength division multiplexing, which relates to the field of integrated silicon photonics technology. The chip includes an AWG and a wavelength thermal tuning structure. The AWG is composed of an input waveguide, a first slab waveguide, an array waveguide, a second slab waveguide, and an output waveguide connected in sequence along the optical path direction. The AWG is used to implement wavelength division multiplexing and demultiplexing. The wavelength thermal tuning structure includes a thermal tuning electrode and a metal electrode. The thermal tuning electrode is located above the array waveguide and is connected to an external control circuit via the metal electrode. The thermal tuning electrode is used to heat the array waveguide according to an external voltage to achieve wavelength tuning of the AWG channel. As the voltage amplitude increases, the heat generated by the thermal tuning electrode increases, and the wavelength of the AWG channel drifts toward a longer wavelength. The technical solution of the present application can realize multi-wavelength dense wavelength division multiplexing on a compact chip, has the advantages of small size and high reliability, and can realize passband wavelength control through the wavelength thermal tuning structure to meet the application requirements of multi-wavelength optical networks.

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 a dynamic interferometer based on AWG high-precision measurement, and an array waveguide grating is used for splitting light beams entering an input port, so that the light beams with different wavelengths are respectively output from different output ports of the array waveguide grating. The light source, the first space lens group and the array waveguide grating are arranged on the displacement mechanism, and the displacement mechanism enables different output ports of the array waveguide grating to be aligned with the second space lens group. A half-wave plate of the interference assembly is located between a second space mirror set and a polarization beam splitter, the polarization beam splitter is used for dividing a light beam passing through the half-wave plate into reference light transmitted along a reference light path and measurement light transmitted along a measurement light path, and the reference light is reflected back to the polarization beam splitter through a reflection mirror surface. The measuring light is reflected back to the polarization beam splitter through the surface to be measured, the reference light and the measuring light which are reflected back to the polarization beam splitter interfere with each other, and an interference image is recorded in the detector, so that the accuracy of obtaining the wavefront image of the surface to be measured is higher.

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 present application provides a method for preparing a flexible optical tactile sensor and a flexible optical tactile sensor. When preparing a flexible optical tactile sensor, it mainly includes two steps: one is to prepare an optical waveguide, and the other is to encapsulate the optical waveguide with a cladding material. Among them, in the stage of preparing the optical waveguide, after a transparent photolithography pattern is formed using a transparent photoresist, a colored photoresist is used to mark the transparent photolithography pattern to prevent the film light path from being unable to be positioned during the subsequent preparation process; further, a waveguide grating is formed by performing two-photon polymerization processing on the two-photon polymerization photoresist, which can greatly improve the spatial resolution of the tactile sensor; in addition, in the above preparation process, the thickness of the formed photolithography pattern and waveguide grating are both at the micro-nano level, so that the prepared tactile sensor has good bendability. In summary, the above preparation method can be used to obtain a tactile sensor with flexibility and high spatial resolution.

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 invention discloses a programmable integrated chip for a high-speed communication network and a control method. The chip comprises an optical fiber coupler array, a plurality of electro-optical modulators, a plurality of optical switches, a plurality of crossed waveguides and an array waveguide grating. The optical fiber coupler array comprises a plurality of first optical fiber couplers, a plurality of second optical fiber couplers and a third optical fiber coupler, and the output ends of the first optical fiber couplers are connected with the input ends of the electro-optical modulators in a one-to-one correspondence mode; the output ends of the electro-optical modulators are connected with the input ends of the optical switches in a one-to-one correspondence mode, each optical switch comprises two output ends, and one output end is connected with the input end of the second optical fiber coupler after passing through a crossed waveguide or is directly connected with the input end of the second optical fiber coupler. The other output end is connected with the input end of the array waveguide grating directly or after passing through a crossed waveguide, and the output end of the array waveguide grating is connected with the input end of the third optical fiber coupler. The method can be applied to a multi-wavelength transmission scene and can also be applied to a single-wavelength transmission scene.