251 results about "Integrated optics" patented technology

The invention provides a coastal wetland ecological corridor identification and optimization method and system, and relates to the technical field of ecological environment monitoring. The method comprises the following steps: integrating optical, radar, terrain, night light and road data on an earth engine cloud platform, and unifying time and space references to form an initial data set; extracting a normalized vegetation index and a vegetation coverage degree, and combining with a water body frequency to identify an ecological source land; generating a comprehensive resistance surface according to the land utilization and coverage type and the road distance; and performing minimum cost path and circuit connectivity analysis in a geographic information system to obtain potential galleries, key nodes and barrier regions, and outputting gallery grades and optimization suggestions in a grading manner according to a cost threshold, thereby realizing high-precision identification and optimization of the coastal wetland ecological network.

The invention discloses a laser design system, a laser design method, electronic equipment and a medium, and belongs to the technical field of integrated optics. The laser design system comprises a first model, input parameters of which comprise set grating parameters of a grating structure of a first to-be-designed laser, and which is used for predicting and outputting a predicted output characteristic curve of the first to-be-designed laser based on the set grating parameters; the input parameters of the second model comprise a set output characteristic curve of a second laser to be designed, and the second model is used for predicting and outputting predicted grating parameters of a grating structure of the second laser to be designed based on the set output characteristic curve; the first model and the second model share the same training data set, the input training data of the first model corresponds to the output training data of the second model, and the output training data of the first model corresponds to the input training data of the second model; the training data set includes pairing data between grating parameters of a grating structure of the sample laser and an output characteristic curve of the sample laser.

The invention relates to the field of performance testing of high-precision fiber-optic gyroscopes, and discloses an automatic testing method and system for the extinction ratio of a high-precision fiber-optic gyroscope, and the method comprises the following steps: constructing a signal light path and a reference light path, and combining the output light of the signal light path and the reference light path into a combined light signal in an orthogonal polarization state; integrally measuring the extinction ratio of the combined optical signal by using an extinction ratio tester to obtain a measured value; the control unit compares the measured value with a target value of 0dB and generates a control instruction based on a difference value; the voltage controller automatically adjusts the voltage of the integrated optical modulator in the signal light path according to the instruction, and iterative optimization is carried out through closed-loop feedback until the actually measured extinction ratio reaches a target value; and finally recording and solidifying the optimal voltage value. According to the invention, single and accurate extinction ratio overall measurement is used for replacing two times of error-prone independent optical power measurement, full-automatic closed-loop control is realized, the precision, efficiency and consistency of optical power balance are remarkably improved, and the skill requirements on operators are reduced.

The invention provides an on-chip optical element, a preparation method thereof and an integrated optical element. The on-chip optical element comprises a substrate, an input coupling waveguide located on the substrate, an output coupling waveguide located on the substrate and a modulation structure. The modulation structure comprises a phase change material layer located on the substrate, the phase change material layer is a continuous film layer and comprises a plurality of units, and the refractive indexes of at least two units are different; and the input coupling waveguide and the output coupling waveguide are respectively positioned at the side parts of the modulation structure, so that light rays emitted to the modulation structure through the input coupling waveguide are propagated along a direction parallel to the surface of the phase change material layer. The integrated optical element includes the on-chip optical element.

The invention provides a method and a system for realizing a weak measurement enhanced chip-level microcavity gyroscope. The method comprises the following steps of: 1, providing a coherent state input by a system by using a single-frequency laser; 2, the output of the single-frequency laser is switched between a first path and a second path through an optical switch, the laser beam is transmitted to the first path in the first half part of the period, and the laser beam is transmitted to the second path in the second half part of the period; 3, the light transmitted along the first path and the second path respectively passes through an optical resonant cavity to sense the rotation angular speed, and a weak value amplification effect is achieved by setting front and back selection states; and step 4, weak measurement enhanced output results transmitted along the first path and the second path are respectively received by a photoelectric detector, and the value of the rotation angular velocity is demodulated according to the obtained output results. According to the invention, the optical microcavity is used as a sensing unit of the gyroscope, the sensing performance of the integrated optical gyroscope is greatly enhanced through a weak measurement technology, and the whole set of system can realize chip-level integration.

A calibration system and related methods for optical phased array chips. The calibration system includes an adjustable mount module, an infrared microscopic observation module, an arrayed driver module, a two-dimensional laser beam scanning module, a photoelectric conversion module and an upper computer, and utilizes computer-vision-enabled positioning and phase error compensation algorithms as software components. Collimated laser is emitted from the target beamforming angle and aimed at the emission aperture of the chip, and is subsequently sampled by the array elements in a reversed injection manner. Based on the reciprocity of light propagation, by maximizing the power reversely output from the bus waveguide of the optical phased array chip, beamforming at the target angle is achieved supported by software implementations of optimization algorithms. The system and related methods are readily achievable, highly automated, and offers fast and batch calibration with relatively low expenses, good flexibility and long-term compatibility.

The invention provides a heterogeneous integrated sub-wavelength structure end face coupler adaptive to a single-mode optical fiber and a preparation method of the heterogeneous integrated sub-wavelength structure end face coupler, and relates to the technical field of integrated optics. The coupler comprises a substrate, an insulating layer, a waveguide layer and a cladding from bottom to top. The waveguide layer comprises an upper lithium niobate ridge waveguide and a lower lithium niobate ridge waveguide, the lower waveguide is wider than the upper waveguide, and the upper waveguide is used for connecting an external waveguide; the heterogeneous integrated coupling region comprises a silicon nitride strip conical waveguide which forms directional coupling with the lower-layer lithium niobate waveguide, so that adiabatic transfer of a light field is realized; the sub-wavelength grating regulation and control region sequentially comprises a silicon nitride tapered waveguide and sub-wavelength grating combination section, a width gradually-changing grating section and an equal-width buffer grating section. The whole structure is symmetrical about the central axis. Through the multi-section adiabatic transformation and heterogeneous integration design, efficient expansion of a mode field is achieved, the coupling efficiency with a single-mode fiber is improved, and the advantages of being insensitive to polarization, good in process compatibility and suitable for high-density integration are achieved.

The integrated optical structure includes a frequency-selective reflecting structure disposed between a decorative cover layer and an underlying metal layer. The underlying metal layer is configured to reflect and / or absorb radio frequency electromagnetic waves transmitted by the decorative cover layer and the frequency-selective reflecting structures. Each of the frequency-selective reflecting structures includes a frequency-selective surface layer having metal elements arranged on a multilayer stack and repeated across the frequency-selective surface layer to form an array. The integrated optical structure reflects collimated incident RF electromagnetic waves having a wavelength in the range of 1.0 mm to 10 cm and incident at an incident angle at a reflection angle different from the incident angle as collimated reflected waves. For normally incident light having a first visible wavelength, the frequency-selective reflecting structure has an optical transmittance greater than 50%.

The lithium niobate-silicon nitride waveguide structure comprises a silicon substrate layer, a first silicon oxide isolation layer, a second silicon oxide isolation layer, a lithium niobate thin film layer and a silicon oxide dielectric layer which are stacked in sequence, the second silicon oxide isolation layer is wrapped with a silicon nitride layer; the thickness of the second silicon oxide isolation layer between the silicon nitride layer and the lithium niobate thin film layer is 50 + / -10nm; the thickness of the silicon nitride layer is 400 + / -10nm, and the thickness of the lithium niobate film layer is 600 + / -50nm; the silicon oxide dielectric layer is provided with at least two electrodes which are arranged at intervals. According to the lithium niobate-silicon nitride waveguide structure, the preparation method and the optical gyroscope provided by the invention, on the basis of the advantages of silicon nitride and lithium niobate materials, an ultra-low-loss silicon nitride waveguide, an ultra-high-Q-value micro-ring resonator and a high-modulation-rate lithium niobate modulator are obtained at the same time through a lithium niobate and silicon nitride hybrid integration method; and thus, the overall performance of the resonant integrated optical gyroscope is improved.

This invention relates to the field of laser technology, specifically to a three-optical-path integrated PDH frequency stabilization system. It includes a three-laser input module, an integrated optical module, and three independent servo control modules. The three-laser input module provides three laser beams to be stabilized. The integrated optical module integrates the functions of the three independent optical paths onto a single substrate, achieving separation of transmission, beam combining, and reflected light. Simultaneously, it receives the three reflected beams and converts them into three electrical PDH error signals. The three independent servo control modules receive the three error signals respectively, process them, and generate feedback control signals, which are fed back to the corresponding three lasers to complete three independent frequency-locking loops. This invention significantly reduces the system's size and cost. The integrated optical module achieves compact integration of the three optical paths, improving system stability and anti-interference capabilities, reducing debugging difficulty, and ensuring system consistency.

There is presented a system for outputting a plurality of electromagnetic, EM, radiation beams. The system is configured such that at least one of the EM radiation beams interacts with an atom of plurality of atoms of a neutral atom, quantum computer that is not interacted with by a second of the EM radiation beams; or, at least two of the EM radiation beams are for interacting with a respective different atom of a plurality of atoms neutral atom quantum computer. The plurality of atoms is for defining a respective plurality of qubits in a quantum computation performed by the neutral atom quantum computer. The system comprises one or more integrated-optic EM radiation source assemblies for generating at least first and second EM radiation and outputting said EM radiation along respective spatially separate output paths. The system comprises a plurality of integrated-optic EM modulator apparatus. At least a first of the integrated-optic EM modulator apparatus is for receiving the first EM radiation. At least a second of the integrated-optic EM modulator apparatus is for receiving the second EM radiation. The system comprises a plurality of output couplers. Each output coupler is for receiving, along a plane, EM radiation output from at least one of the integrated-optic modulator apparatus. Each output coupler is further for outputting the received EM radiation as an EM radiation beam in a direction either along the same plane or out of the plane.

The invention discloses an on-chip integrated optical frequency comb generation structure and an optical frequency comb generation method, the structure is formed by heterogeneous integration of a laser chip and an integrated optical microcavity chip, and the integrated optical microcavity chip comprises a polarization beam splitter, two ring filters, an Add-drop type microcavity and two output ports; the polarization beam splitter is used for dividing laser injected by the laser chip into a TE mode and a TM mode, and the TE mode and the TM mode have different power ratios and are injected into the two ring filters respectively. The two ring filters are respectively provided with a heating electrode for controlling the size of the passing wavelength, and the two ring filters have different diameters for transmitting different wavelengths; the Add-drop type microcavity is used for generating an optical frequency comb, and a heating electrode is arranged above the microcavity and used for controlling the resonant wavelength passing through the microcavity. The problems that an existing optical frequency comb debugging system is large and debugging is complex can be solved, the size of the microcavity optical frequency comb can be greatly reduced, and power consumption is reduced.

The invention discloses a coaxial automatic focus detection system based on FPGA acceleration, which comprises a computer, an integrated optical module and an FPGA processing module, and is characterized in that the computer is used for issuing instructions to the integrated optical module and the FPGA processing module and controlling image data to be transmitted between the integrated optical module and the FPGA processing module; the integrated optical module is used for projecting a pattern to a to-be-measured object and collecting an optical signal reflected by the to-be-measured object; and the FPGA processing module is used for directly performing phase shift modulation degree calculation on the acquired sequence image flow through internal parallel hardware logic, and constructing a modulation degree-axial position curve of each pixel point in parallel to determine an optimal focal plane. According to the method, the coding pattern is actively projected, stable and reliable characteristics are established for the focus detection process, a general optical principle and special hardware acceleration are deeply fused, a traditional software processing mode is replaced, the order of magnitude of the focus detection speed is improved, the system has high adaptability, the application range is expanded, and the method is suitable for high-speed online precision detection.

The embodiment of the present application provides a grating encoder and an encoding method, and relates to the technical field of integrated optical devices. The grating encoder comprises an optical signal input end, a mode regulation area and an optical signal output end, the mode regulation area comprises a substrate, at least two straight waveguides and at least one subwavelength grating waveguide; the at least two straight waveguides and the at least one subwavelength grating waveguide are alternately and equally spaced arranged on the substrate; the duty cycle of one subwavelength grating waveguide in the unit where the subwavelength grating waveguide is located is 0.5, and the unit is composed of the subwavelength grating waveguide, the straight waveguide alternately arranged with the subwavelength grating waveguide and the interval between the subwavelength grating waveguide and the straight waveguide; one subwavelength grating waveguide and one straight waveguide alternately arranged with the subwavelength grating waveguide jointly constitute one unit cell, and each individual unit cell contains one normalized flux. The signal strength attenuation and mode distortion are reduced.

The invention belongs to the technical field of integrated optical devices, and discloses a compact, high-efficiency and large-bandwidth thin-film lithium niobate end face coupler for large die spots, which comprises a substrate and an insulating layer, the single-layer back taper film lithium niobate waveguide layer, the first double-layer back taper film lithium niobate waveguide layer and the second double-layer back taper film lithium niobate waveguide layer are arranged on the insulating layer; the low-refractive-index waveguide layer is arranged in front of the thin-film lithium niobate waveguide, and the thin-film lithium niobate waveguide is covered with the three-dimensional tapering low-refractive-index waveguide wrapping layer. According to the invention, the coupling efficiency and bandwidth are improved by optimizing the low-refractive-index waveguide layer and matching with the mode of a laser chip large spot; the optical mode is efficiently and compactly coupled to the second double-layer inverted-cone waveguide layer by means of the single-layer and double-layer inverted-cone thin film lithium niobate waveguide layers in cooperation with the three-dimensional tapering low-refractive-index waveguide cladding layer and the transition cladding layer.

The invention discloses an integrated optical chip processing method for improving the full-temperature stability of a lithium niobate electro-optical modulation coefficient. The method comprises the steps that S1, the surface of an integrated optical chip is coated with a layer of photoresist with the thickness ranging from 20 micrometers to 30 micrometers, and thermocuring treatment is conducted after bonding; s2, two to-be-ground and polished end face areas of the integrated optical chip are each bonded with an accompanying piece through removable pyrolysis glue, and UV curing is carried out after bonding; s3, the integrated optical chips bonded with the accompanying chips are bonded with pyrolysis glue, and UV curing treatment is carried out; and S4, after the end face is processed, the assembly is soaked in warm water at the temperature of 85 DEG C to remove the pyrolysis glue, separation of the integrated optical chip and the chip and separation of the accompanying chip and the chip are completed, after the chip is completely separated, the chip is soaked in acetone at the normal temperature to remove the photoresist on the surface, and processing of the end face of the integrated optical chip is completed.

The present disclosure relates to an optical switching network having optical switches that controllably reroute light between bus optical waveguides. An optical switch includes a shunt optical waveguide disposed vertically in a gap between a first bus optical waveguide formed in a first waveguide layer and a second bus optical waveguide formed in a second waveguide layer and configured to movably optically couple the first and second bus optical waveguides when activated. The first waveguide layer and the optical switch are formed on a first substrate and the second waveguide layer is formed on a second substrate bonded to the first substrate or mechanically supported by a plurality of anchors extending between the first and second substrates. The optical switch network includes a sensor for identifying a failed optical switch and a recovery optical waveguide and optical switch providing a recovery optical path to bypass the failed optical switch.

The invention provides a high-resolution broadband integrated spectrometer based on thin film lead zirconate titanate and a preparation method, and relates to the technical field of integrated optics. The structure of the spectrometer comprises a substrate; the silicon dioxide lower cladding layer is arranged on the substrate; the lead zirconate titanate thin film waveguide layer is arranged on the silicon dioxide lower cladding, a plurality of micro-ring resonators and a plurality of array waveguide gratings are arranged in the lead zirconate titanate thin film waveguide layer, and each array waveguide grating is connected with each micro-ring resonator through a waveguide; the sectional periodic metal electrode arrangement system is arranged in each section of straight waveguide area in the micro-ring resonator; wherein the plurality of micro-ring resonators are configured with resonant wavelengths which are distributed in a staggered manner, and the interval between the adjacent resonant wavelengths is 1 / n of the interval between the array waveguide grating channels; the spectrometer is configured to change the local waveguide refractive index by using the residual polarization effect of the lead zirconate titanate thin film through a segmented polarization method so as to realize alignment of the resonant wavelength and the center of the array waveguide grating channel.

This application provides an optical filter, a wavelength division multiplexing (WDM) device, and an optical quantum computer, relating to the field of integrated optics. The optical filter provided in this application is configured based on the Mach-Zehnder interferometer principle and has two waveguides, each containing multiple phase shifters. To overcome manufacturing and temperature errors in the optical filter, the lengths of the aforementioned phase shifters are constrained so that the sum of the product of the effective refractive index fluctuations of the phase shifters on both sides under temperature changes and their lengths is equal, and the sum of the product of the effective refractive index fluctuations of the phase shifters under width changes and their lengths is also equal. This overcomes the influence of manufacturing and temperature fluctuations on the optical filter, improving its stability. Furthermore, considering the solvability of the aforementioned constraints, the aforementioned phase shifters can have at least three waveguide widths (preferably four) to ensure that the aforementioned constraints can be practically achieved.

An integrated optical device includes a substrate, a waveguide structure and a grating structure. The substrate has a waveguide region and a grating region adjacent to each other. The waveguide structure is disposed on the substrate in the waveguide region. The grating structure is disposed on the substrate in the grating region. In some embodiments, the grating structure includes grating bars and grating intervals arranged alternately, and widths of the grating bars of the grating structure are varied.

The invention discloses a ring type blood glucose noninvasive detection device based on multi-modal sensing fusion, and relates to the technical field of medical detection equipment. A baseline construction module; an interference decoupling module; a cross-mode experience verification module; a result feedback module; by integrating optical, electrochemical and mechanical sensors, the accuracy and anti-interference capability of blood glucose noninvasive detection are improved by using a multi-modal data fusion technology, and the traditional single-modal limitation is broken through; meanwhile, a self-supervised learning algorithm is adopted to construct a personalized digital twin baseline, dynamic adjustment is performed in combination with data such as diet and exercise of the user, and customized health intervention suggestions are generated, so that the design not only improves the clinical applicability of noninvasive detection, but also improves the continuity of blood glucose monitoring through a closed-loop management mode, reduces the risk of complications, and improves the accuracy of blood glucose monitoring. And an innovative scheme is provided for chronic disease management.

The application discloses an optical mode demultiplexer based on a cascaded silica multimode interferometer structure, and belongs to the technical field of silica integrated optics. The optical mode demultiplexer is composed of a substrate, a lower cladding layer, a core layer and an upper cladding layer from bottom to top, the core layer and the upper cladding layer are located above the lower cladding layer, the core layer is completely covered in the upper cladding layer, the materials of the upper cladding layer and the lower cladding layer are silica, the material of the core layer is germanium-doped silica, and the material of the substrate is silicon. The core layer is composed of three parts in cascade, the first part is two-stage Y-branch waveguides in cascade, the second part is a 4*4 multimode interferometer, and the third part is two straight waveguides and a 2*2 multimode interferometer. The device can output TE0 mode from four different ports when TE0, TE1, TE2 and TE3 modes are input respectively, thereby realizing the mode demultiplexing function. The device adopts a passive structure, and the phase of an optical signal in a waveguide is adjusted through a waveguide phase shifter, so that the mode demultiplexing function is realized.

A method for manufacturing integrated optics devices (2) is described. Each device (2) comprises electrical contact pads (20) and at least one poled optical element (12a, 12b). The method includes forming, on a wafer (24), first structures of a plurality of the devices (2) in a two-dimensional array of device regions (26). Within each device region (26), the first structures of one of the devices (2) are formed. These first structures comprise at least some of the contact pads (20) of the device (2), electrodes (16a, 16b, 16c) electrically connected to the contact pads (20), and an unpoled dielectric or semiconducting material (14a, 14b) between the electrodes (16a, 16b, 16c). For poling the material, at least one group (50) of the devices (2) is contacted by means of a contact member (28). The contact member (28) comprises a plurality of electrically conductive contact elements (32), and the contact elements (32) are brought into electrical contact with at least part of the contact pads (20). The group (50) is then heated in order to increase a temperature of the material (14a, 14b), to a poling temperature. At the same time, a voltage is applied to the electrodes (16a, 16b, 16c) by means of the contact member (28), thereby poling the material (14a, 14b).

The application discloses a design method of an integrated multi-mode curved optical waveguide and the integrated multi-mode curved optical waveguide and belongs to the technical field of integrated optics. Aiming at the problem that a traditional multi-mode curved waveguide is difficult to consider low loss and low crosstalk at a compact size, a waveguide model formed by cascading multiple variable-width generalized Euler spiral curve elements is constructed. Through an iterative optimization algorithm based on mode field analysis, the curvature radius and the waveguide width of each curve element are controlled in double degrees of freedom to obtain optimal geometric parameters with the minimum full-mode loss as the target. The waveguide structure breaks through the limitation of the traditional fixed-width design, realizes low-loss and low-crosstalk transmission of multi-mode signals at a very small bending radius, significantly improves the tolerance of the device to manufacturing process deviation, and is suitable for a high-density on-chip optical interconnection system.

The invention discloses an optical interface structure of an integrated photonic chip for a fiber-optic gyroscope and an optical coupling method, and belongs to the technical field of integrated optics and optical fiber sensing. All input and output ports of the integrated photon chip are arranged on a coupling end face on the same side of the chip, the ports comprise at least two signal ports and two auxiliary ports, the signal ports are used for connecting tail fibers of polarization maintaining fiber rings of all measuring axes of the fiber-optic gyroscope, and the auxiliary ports are connected with a through type auxiliary coupling optical channel in the chip; each port is integrated with a spot size adaptation unit, and the spot size adaptation unit is used for matching the spot size of the polarization maintaining optical fiber and the chip waveguide; the integrated photon chip realizes single-side end face alignment coupling with the multi-channel polarization-maintaining optical fiber array through the coupling end face, tail fibers of polarization-maintaining optical fiber rings of all measuring axes of the optical fiber gyroscope are directly solidified in the multi-channel polarization-maintaining optical fiber array, a head channel and a tail channel of the multi-channel polarization-maintaining optical fiber array are aligned with two auxiliary ports of the chip respectively, and no extra welding link is needed. According to the invention, the problems of dispersed channel-by-channel coupling of optical interfaces, complex alignment of two-side FAs, large dual-link coupling loss, serious polarization cross coupling and uncontrollable coupling quality are solved, the overall precision and environmental stability of the fiber-optic gyroscope are remarkably improved, the method is suitable for various fiber-optic gyroscopes with single axes, multiple axes and the like, and the system integration level and the assembly consistency are remarkably improved.

Systems and methods are provided for an open path gas detection system having a receiver with an optical sensor configured to continuously capture optical image data. A field of view of the optical sensor may include a path of a focused light beam received by a light sensor of the receiver. The receiver may be configured to receive and temporarily store the optical image data in the memory buffer, and then transmit the optical image data to the persistent memory region upon receipt of a transfer command. In various cases, a transmission command may be provided, such as when a receiver requests, when a predefined object of interest is identified in the optical image data, or when an occlusion occurs and the light sensor no longer receives the focused beam.

The invention relates to a method (100) for integrating optical and electromagnetic sensor data, comprising the following steps, which are performed by the transformer-based neural system (30), in particular a transformer-based neural network (30): - Receiving (101) optical and electromagnetic sensor data from one or more sources in an environment, - Preprocessing (102) the received optical and electromagnetic sensor data to generate representations of features suitable for input into the transformer-based neural system (30), - Transforming (103) the preprocessed optical and electromagnetic sensor data via the transformer-based neural system (30) which employs one or more self-attention mechanisms and / or one or more cross-modal interaction techniques to integrate and combine the generated representations of the features, - Generating (104) a unified representation based on transforming (103).

The invention provides a super-power illumination system and illumination method based on multi-light-source optical fiber integration, and the system comprises at least two independent light source modules, optical coupling units with the number corresponding to that of the light source modules, a plurality of optical transmission channels, and an integrated optical output terminal comprising a light beam synthesis and scattering device. The optical coupling units are used for focusing and coupling light rays emitted by the corresponding light source modules, and the multiple light transmission channels are used for conducting the light rays focused by the light source modules; and the integrated optical output terminal is used for receiving the light beams from all the optical fibers, synthesizing the light beams and scattering the light beams into uniform and large-spot integrated output light. Light is transmitted through the optical fiber, no current passes through a transmission path, potential safety hazards such as electric leakage and electric sparks are completely eradicated, efficient focusing and coupling of visible light are achieved through the optical coupling module, loss of the light in the initial transmission stage is greatly reduced, and the overall energy efficiency of a lighting system is improved.

An interferometric quadrature detection system is disclosed that combines a reference or local oscillator signal with a sample or modulated signal in a fused fiber coupler having at least three outputs to generate phase-shifted signals. The phase-shifted signals are processed using either additional fused fiber couplers with balanced photoreceivers or single-ended photodetectors with subsequent analog subtraction to generate differential signals. The differential signals are used to reconstruct a complex-valued representation of the interferometric signal, enabling unambiguous recovery of amplitude and phase at or near the shot-noise limit. The disclosed methods and apparatus provide fiber-based alternatives to integrated optical hybrids and are applicable in optical coherence tomography, interferometric sensing, coherent optical communication systems and other applications.

The invention belongs to the technical field of integrated photoelectronics, and particularly relates to an integrated optical device segmentation design method based on heuristic iteration and simulation feedback, which comprises the following steps: S1, physical analysis and heuristic initial width selection; s2, constructing a model and simulation feedback; s3, carrying out iterative manual adjustment and refinement; and S4, convergence and final design determination. Compared with a full-automatic violent optimization algorithm, the method has the advantages that the parameter space needing to be explored is greatly reduced through human heuristic selection, so that the calculation time and cost are remarkably reduced. And through iteration refinement based on physical insight, the method can systematically approach to an optimal solution, the randomness of pure manual design and the roughness of simple rule division are avoided, and the finally designed device is excellent in performance. The invention provides a set of engineering design process which is clear in structure and high in operability, so that the design process of a complex device is standardized and is easy to master and apply by engineers.