28 results about "Thermo-optic coefficient" patented technology

The application discloses a modulation-insensitive dual-mode waveguide optical switch and a preparation method thereof, and belongs to the technical field of planar optical waveguide devices. The switch is composed of a silicon wafer substrate, a polymer lower cladding layer, a polymer optical waveguide core layer and a polymer upper cladding layer from bottom to top, the polymer optical waveguide core layer is covered in the polymer upper cladding layer, and the refractive index of the polymer optical waveguide core layer is higher than that of the polymer upper cladding layer and the polymer lower cladding layer. The application utilizes the advantages of simple asymmetric directional coupling structure and asymmetric Y branch structure and the large thermal-optical coefficient of organic polymer materials, and realizes the modulation-insensitive switch of two signal optical modes through mode conversion by using the asymmetric Y branch when the heating electrode is modulated. The preparation process of the application is simple, only needs spin coating, photoetching and wet etching, effectively reduces the production cost, improves the production efficiency of the device, is favorable for large-scale batch production, and enables the mode signal optical switch to be applied to actual use.

A rare-earth doped optical fiber (active optical fiber) is presented that exhibits a thermal coefficient of optical refraction (dn / dT) of the core region that is reduced relative to the thermal coefficient of optical refraction (dn / dT) of the surrounding cladding. The reduction of the dn / dT of the core region has been found to reduce the impact of transverse mode instability (TMI) in the presence of high levels of pump power (or other conditions that can also increase the thermal load present in the core region). Specifically, it has been found that reducing the dn / dT of the core region relative to the dn / dT of the cladding by at least 10% is sufficient to extend the temperature range in which the active optical fiber is maintained in single mode operation. The reduction of the dn / dT can be provided by modifying the dopants introduced into the core region, where, for example, it is known to introduce boron into ytterbium doped optical fibers to reduce the dn / dT of the core region.

The invention relates to chalcogenide glass with a low thermo-optical coefficient as well as a preparation method and application of the chalcogenide glass. The chalcogenide glass with the low thermo-optical coefficient is prepared from the following components in percentage by weight: 78 to 84 percent of Se; 12%-20% of Ge; and 4%-8% of As. Through specific component design, the thermo-optical coefficient is reduced, and the influence of temperature on the optical system is reduced, so that the wavefront distortion control precision of the optical system in an extreme temperature environment is ensured.

This invention discloses an ultra-low residual amplitude modulation waveguide-optical phase modulator, comprising a first electrode layer and a second electrode layer parallel to each other. An α-phase waveguide channel and a substrate layer are disposed between the first and second electrode layers. The optical axes of the α-phase waveguide channel and the substrate layer are both perpendicular to the plane of the first electrode layer. The difference between the thermo-optical coefficient of the α-phase waveguide channel and the thermo-optical coefficient of the substrate layer is less than a preset thermo-optical coefficient difference threshold. Part of the side of the α-phase waveguide channel is covered by the substrate layer. The electric field between the first and second electrode layers uniformly covers the entire α-phase waveguide channel and the substrate layer. The two ends of the α-phase waveguide channel serve as the input and output ends of the light beam, respectively. This invention, by changing the electric field application method and thermo-optical coefficient matching, fundamentally maintains the consistency of the interference phase, thereby significantly reducing the sensitivity of RAM signals to voltage and ambient temperature fluctuations.

Provided in the present invention is a thermo-optic phase shifter array, including at least one first waveguide and at least one second waveguide, where the first waveguide extends in a first direction, the second waveguide extends in a second direction, the first waveguides and the second waveguides are alternately arranged in a third direction, the first waveguide includes a first waveguide section, the second waveguide includes a second waveguide section, the first waveguide sections and the second waveguide sections are alternately arranged in the third direction, the first waveguide section is integrated with a heater, and a thermo-optic coefficient of the second waveguide section is smaller than that of the first waveguide sections. The thermo-optic phase shifter array provided by the present invention has lower thermal crosstalk, and has a compact structure, facilitating high-density integration. The present invention further provides an interferometer array and an optical phased array.

The invention provides a chiral coupling ytterbium-doped optical fiber and a high-power optical fiber laser, and relates to the technical field of optical fibers. The ytterbium-doped optical fiber sequentially comprises a central fiber core, a plurality of spiral side cores, an inner cladding and an outer cladding from inside to outside, wherein the spiral side cores are spirally wound on the central fiber core along the axial direction of the central fiber core; wherein the basic mode refractive index of at least one spiral side core in the multiple spiral side cores is different from the refractive index of the central fiber core in a preset high-order mode, and the thermo-optical coefficient of the spiral side core with the refractive index different from the refractive index of the central fiber core in the preset high-order mode is larger than that of the central fiber core. The chiral coupling ytterbium-doped optical fiber provided by the invention can effectively remove a high-order mode in the central fiber core.

The invention discloses CsSnCl3 nanocrystal doped chalcogenide glass and acousto-optic application of the CsSnCl3 nanocrystal doped chalcogenide glass, the molar composition formula of the chalcogenide glass is 97 (0.8 GeS2-0.2 Sb2S3)-3 CsSnCl3, and CsSnCl3 nanocrystals separated out in situ through heat treatment are dispersed in the chalcogenide glass. The chalcogenide glass has the advantages as follows: the chalcogenide glass has excellent thermal mechanical properties and high robustness, the comprehensive characteristics are outstanding, the Vickers hardness, the elastic modulus, the thermo-optical coefficient, the laser damage threshold and other parameters of the chalcogenide glass are remarkably improved compared with those of current mainstream acousto-optic chalcogenide glass, and a guarantee is provided for stable operation of a device in a high-temperature and high-power environment; the CsSnCl3 nanocrystals are packaged by using the stable glass matrix, so that the problems that the Sn-based perovskite material is easy to oxidize in the environment and poor in stability are fundamentally solved; the material has good infrared acousto-optic comprehensive characteristics and an ultra-wide infrared transmission range, can be used as an acousto-optic medium to be applied to acousto-optic devices, and has a wide application prospect in the acousto-optic field.

The invention provides an optical switch and a silicon optical chip, the optical switch comprises a first waveguide and a second waveguide, and the first waveguide and the second waveguide are arranged in parallel; the second waveguide comprises a main body and a first slot arranged in the main body; the first waveguide is made of a first material, the main body is made of the first material, and the first gap is filled with a second material; the thermo-optical coefficient of the first material is greater than that of the second material; the optical switch is sequentially provided with an input port area, an input coupling area, a non-coupling phase modulation area, an output coupling area and an output port area in the light propagation direction, and the input port area, the input coupling area, the non-coupling phase modulation area, the output coupling area and the output port area are all arranged on the first waveguide and the second waveguide. The width of the first waveguide in the uncoupled phase modulation area is 450 nanometers, and the width of the second waveguide in the uncoupled phase modulation area is 600 nanometers. The cost is reduced while the optical switch is realized.

An optical sensor system is adapted for a sensing method using fiber segment interferometry. A sensing element with a thermo-optic coefficient larger than the thermo-optic coefficient of an optical fiber is arranged at a distal end of the fiber.

The invention discloses a groove-type micro-ring resonant cavity sensor, and relates to the field of optical waveguide sensors, the sensor comprises a coupling area integrated with an S-shaped bent waveguide and a groove-type micro-ring resonant cavity formed by a groove-type waveguide formed by waveguide ridges, and the groove and the cavity of the groove-type micro-ring resonant cavity are filled with an aqueous solution with a negative thermo-optical coefficient as an upper cladding. According to the invention, the optical coupling efficiency is optimized through the design of the S-shaped bent waveguide, and the energy of an optical field is highly converged in the groove, so that the interaction efficiency of light and a to-be-detected substance is improved, and the sensing sensitivity of the sensor is improved; meanwhile, the negative thermo-optic effect of the aqueous solution is utilized to accurately compensate the positive thermo-optic effect of silicon and silicon dioxide, so that the effect that the change rate of the effective refractive index to the temperature tends to zero is achieved, the sensing sensitivity of the sensor is further improved, and the problem that in a traditional scheme, sensing sensitivity improvement and temperature drift suppression contradict with each other is effectively solved.

To provide a method for solving a problem of a conventional sensing method, and an optical sensor system 100.SOLUTION: According to the present invention, an optical sensor system (100) adapted for a sensing method using fiber segment interferometry is provided, wherein at the distal end of the fiber (73) a sensing element (1. I) is arranged having a thermo-optic coefficient larger than the thermo-optic coefficient of the optical fiber (73. I).SELECTED DRAWING: Figure 4

The invention relates to an optical sensor system (100), a sensing method suitable for interferometry using a fiber segment, in which a sensing element 1. I having a thermo-optical coefficient greater than that of the fiber 73. I is arranged at the distal end of the fiber 73.

The waveguide electro-optic phase modulator comprises a first electrode layer and a second electrode layer which are parallel to each other, and an alpha-phase waveguide channel and a substrate layer are arranged between the first electrode layer and the second electrode layer. The optical axis of the alpha-phase waveguide channel and the optical axis of the substrate layer are both perpendicular to the plane where the first electrode layer is located, and the difference value between the thermo-optical coefficient of the alpha-phase waveguide channel and the thermo-optical coefficient of the substrate layer is smaller than a preset thermo-optical coefficient difference threshold value; part of the side face of the alpha-phase waveguide channel is covered by the substrate layer, an electric field between the first electrode layer and the second electrode layer evenly covers the whole alpha-phase waveguide channel and the substrate layer, and the two ends of the alpha-phase waveguide channel serve as the input end and the output end of light beams respectively. According to the invention, by changing the electric field application mode and thermo-optical coefficient matching, the consistency of interference phases is fundamentally maintained, so that the sensitivity of RAM signals to voltage and environment temperature fluctuations is remarkably reduced.

The present application relates to the technical field of resins, and in particular to an optical resin, a preparation method therefor, and use thereof. The optical resin is a polyamide-imide resin containing at least two of repeating units represented by formula I, formula II, and formula III, wherein R1, R2, R3, R4, and R5 are each independently selected from one of aryl and substituted aryl. According to the optical resin of the present application, by means of introducing the repeating units represented by formula I, formula II, and formula III and an amide bond, the interaction of hydrogen bonds between molecules is used to make the optical resin polymer have a relatively low thermo-optic coefficient. In addition, by means of the reasonable proportioning and combined action of different repeating unit chain segments, the optical resin has good optical properties, good optical transmittance at 1550 nm, and melt processing performance, which can meet injection molding processing requirements.

This invention discloses a multimodal integrated optical microcavity, belonging to the field of integrated photonic device technology. The multimodal integrated optical microcavity includes a first microcavity structure and a second microcavity structure coupled in a vertical direction. The first and second microcavity structures are made of different materials, and by adjusting the waveguide thickness and width, the two microcavities have approximately the same free spectral range within a preset operating wavelength band. Because the two materials have different thermo-optic coefficients, differential resonant frequency shifts can be naturally generated during thermal tuning of the bilayer microcavity. Combined with the vernier coupling effect between the microcavities, a Moore acceleration effect is formed, thereby achieving a wide range of adjustment of the microcavity's dispersion characteristics. By controlling the thermal excitation conditions, switching between normal dispersion and anomalous dispersion can be achieved, enabling a single device to support multiple optical operating modes. This invention has a simple structure, stable control, and strong process compatibility, making it suitable for reconfigurable integrated photonic systems.

The invention relates to the field of photon integrated circuits, in particular to a temperature sensor based on an enhanced vernier effect and an optical chip, and aims to improve the structure of the temperature sensor and improve the detection sensitivity. In order to achieve the purpose, the temperature sensor comprises two Mach-Zehnder interference structures which are connected in parallel, and upper cladding layers of a sensing arm and a reference arm are made of two upper cladding layer materials with opposite thermo-optical coefficients. Through the design of the sensing arm and the reference arm which are connected in parallel, an enough separation space is formed between the two arms, different upper cladding materials can be conveniently covered, and the process difficulty is reduced; two upper cladding materials with opposite thermo-optical coefficients are adopted as the upper cladding of the sensing arm and the upper cladding of the reference arm respectively, the wavelength drift amount of the envelope of the output combined spectrum along with the temperature change can be greatly improved, and therefore the sensitivity of the temperature sensor is improved.

A spatial light modulator having a layer of thermo-optical medium, where the thermo-optical medium is at least partially transparent for at least one spectral component of visible or near infrared light and having the thermal conductivity between 0.01 and 30 W K−1 m−1 at the temperature of 20° C. and the layer having a thickness up to 100 μm is disclosed. At least one heating microsource in thermal contact with the layer of the thermo-optical medium, where each heating microsource has at least one dimension smaller than 10 μm, and at least one substrate in thermal contact with the thermo-optical medium, the substrate having a thermo-optic coefficient at least 10 times smaller than a thermo-optic coefficient of the thermo-optical medium and a thermal conductivity of at least 1 W K−1 m−1 while the thermal conductivity of the substrate is higher than the thermal conductivity of the thermo-optical medium.

The invention discloses a method and a system for joint simulation of an optical transparent part forming process and product optical performance and a readable storage medium, and the method comprises the steps: building an optical plastic part parameterized geometric model, setting technological parameters, and carrying out mold flow simulation through Moldflow / Moldex3D to obtain a multi-field data set; displacement information is extracted to update optical surface parameters, and a refractive index three-dimensional field is constructed based on a stress-optical law and a thermo-optical coefficient; optical simulation is executed through Zemax to obtain performance indexes such as wavefront error and MTF (Modulation Transfer Function); a proxy model is constructed in combination with an optimization algorithm, and digital twinning is realized by docking production equipment through an OPC UA protocol. The process-optical performance full-link cut-through analysis is realized, the simulation automation and precision are improved, the online process adjustment is supported, the mold testing times can be reduced, the development period is shortened, and the method is suitable for research, development and production of optical plastic parts such as automobile headlamps, aviation portholes and camera lenses.

The present application relates to the technical field of resins, and in particular to an optical resin, a preparation method therefor, and use thereof. The optical resin is a polyamide-imide resin containing at least two of repeating units represented by formula I, formula II, and formula III, wherein R1, R2, R3, R4, and R5 are each independently selected from one of aryl and substituted aryl. According to the optical resin of the present application, by means of introducing the repeating units represented by formula I, formula II, and formula III and an amide bond, the interaction of hydrogen bonds between molecules is used to make the optical resin polymer have a relatively low thermo-optic coefficient. In addition, by means of the reasonable proportioning and combined action of different repeating unit chain segments, the optical resin has good optical properties, good optical transmittance at 1550 nm, and melt processing performance, which can meet injection molding processing requirements.

The application discloses a hydrogen concentration detection sensor and a hydrogen concentration detection method, wherein the sensor comprises a substrate, a waveguide core layer arranged on the substrate, and a cladding layer covering the waveguide core layer; a subwavelength grating structure is formed in the waveguide core layer, the subwavelength grating structure supports modes and modes and can generate bimode interference, the material of the waveguide core layer has a positive thermal-optical coefficient, single-mode waveguides are coupled to two ends of the subwavelength grating structure, an asymmetric coupling structure is formed between the single-mode waveguides and the subwavelength grating structure, and the asymmetric coupling structure is used for exciting two modes of modes and modes; the material of the cladding layer has a negative thermal-optical coefficient, the surface of the cladding layer is decorated with a hydrogen-sensitive material layer, and the hydrogen-sensitive material layer can catalyze an exothermic oxidation reaction with hydrogen. The application converts the hydrogen concentration change into the shift of an interference peak wavelength, compared with a traditional sensor which only depends on a single physical effect, the sensitivity is greatly improved, the sensor is easy to be integrated on a chip, does not need external electric driving, and is intrinsically safe and reliable.

The application provides a kind of optical switch and silicon optical chip, optical switch includes first waveguide and second waveguide, first waveguide is arranged with second waveguide in parallel;Second waveguide includes main body and first gap arranged in main body;First waveguide is composed of first material, main body is composed of the first material, first gap is filled with second material;Thermal-optical coefficient of first material is greater than thermal-optical coefficient of second material;Along the direction of light propagation, optical switch is sequentially provided with input port area, input coupling area, non-coupling phase modulation area, output coupling area and output port area, input port area, input coupling area, non-coupling phase modulation area, output coupling area and output port area are all arranged on first waveguide and second waveguide;The width of first waveguide in non-coupling phase modulation area is 450 nanometers, and the width of second waveguide in non-coupling phase modulation area is 600 nanometers.The application realizes optical switch while reducing cost.

The invention discloses a multi-mode integrated optical microcavity, and belongs to the technical field of integrated photonic devices.The multi-mode integrated optical microcavity comprises a first microcavity structure and a second microcavity structure which are coupled in the vertical direction, and the first microcavity structure and the second microcavity structure are made of different materials; and the thickness and the width of the waveguide are adjusted, so that the two microcavities have approximately same free spectral ranges in a preset working wave band. Due to the fact that the two materials have different thermo-optical coefficients, differential resonance frequency shift can be naturally generated when the double-layer micro-cavity is subjected to thermal tuning, and the vernier coupling effect between the micro-cavities is combined to form the mole acceleration effect, so that large-range adjustment of the dispersion characteristic of the micro-cavity is achieved. By controlling thermal excitation conditions, switching between normal dispersion and abnormal dispersion can be realized, so that a single device supports multiple optical working modes. The reconfigurable integrated photonic system is simple in structure, stable in regulation and control, high in process compatibility and suitable for the reconfigurable integrated photonic system.

Controlling a low-threshold femtosecond supercontinuum (fs SCG) in a bulk nonlinear material (BNLM) with a positive thermo-optic coefficient (dn / dT>0 K−1) is provided by coupling light at a first wavelength output by a fs oscillator at a full pulse repetition PRR into the BNLM. The coupling of light produces a nonlinear lens of the coupled beam in the BNLM which is insufficient to provide intensity of the light sufficient to reach ta threshold of the fs SCG. To raise the pulse energy and reach the SCG threshold, light at a second wavelength different from the first wavelength is absorbed in the BNLM to form a thermal lens in the BNLM which assist the nonlinear lens in creating the SCG.

The invention relates to the technical field of resin, in particular to optical resin as well as a preparation method and application thereof. Wherein the optical resin is polyamide-imide resin containing at least two of repeating units shown in a formula I, a formula II and a formula III, and R1, R2, R3, R4 and R5 are respectively and independently selected from one of aryl and substituted aryl. According to the optical resin disclosed by the invention, by introducing the repeating units as shown in the formula I, the formula II and the formula III and amido bonds, the optical resin polymer has a relatively low thermo-optical coefficient by utilizing hydrogen bond interaction among molecules. Meanwhile, through reasonable proportioning and combined action of different repetitive unit chain segments, the optical resin has good optical performance, has good optical permeability and melt processability at 1550 nm, and can meet injection molding processing requirements.

An optical power limiter, a method of fabricating an optical power limiter, an optical device or system comprising an optical power limiter, and a method of limiting optical power using on optical power limiter. The optical power limiter comprises a first optical mode altering element configured to receive an input optical signal from a first waveguide; and an active medium coupled to the first optical mode altering element at a first end of the active medium such that a mode altered optical signal based on the input optical signal can enter the active medium, wherein a second end of the active medium is configured to couple the mode altered optical signal into a second waveguide as an optical output signal; wherein the active medium has a thermo-optic coefficient such that the mode altered optical signal entering the active medium experiences a refractive index gradient in the active medium as a result of absorption; and wherein the power of the optical output signal coupled into the second waveguide is limited to a maximum power value based on mode overlap of the mode altered optical signal and the second waveguide.

The application provides a micro-ring resonator modulator and an optoelectronic hybrid package. The micro-ring resonator modulator comprises a micro-ring resonator and a negative thermal coefficient material layer. The micro-ring resonator comprises a first sub-wavelength grating, and a grating period of the first sub-wavelength grating is less than a working wavelength of the micro-ring resonator. The first sub-wavelength grating comprises a ring waveguide and a plurality of first grooves arranged on the ring waveguide, and the plurality of first grooves are arranged in a circumferential direction of the ring waveguide. The negative thermal coefficient material layer comprises a negative thermal coefficient material, and the negative thermal coefficient material layer fills the first grooves. The micro-ring resonator provided by the embodiment of the application reduces energy consumption of temperature control.

The invention discloses an acceleration self-compensation type multi-point temperature sensor for measuring a surface temperature field of a rotating shaft, and belongs to the field of optical fiber sensing. The device comprises a multi-core photonic crystal fiber, a high thermo-optical coefficient liquid, a fiber bragg grating, a flexible metal capillary tube, a polyimide composite material coating and an elastomer material damping layer. The flexible metal capillary tube, the polyimide composite material coating and the elastomer material damping layer are sequentially arranged from inside to outside to form a hollow cavity. The multi-core photonic crystal fiber is arranged in the cavity, and one end of the multi-core photonic crystal fiber is fixed. And the fiber bragg gratings are written into each fiber core of the multi-core photonic crystal fiber in an array form. The multi-core photonic crystal fiber has at least five cores and comprises a central fiber core and four side fiber cores, wherein at least six large-size air holes are distributed in the periphery of the central fiber core, and the side fiber cores surround in a square shape. The central wavelength of the central fiber core FBG is different from the central wavelength of the side fiber core FBG. The large-size air holes are filled with high-thermal-optical-coefficient liquid and sealed through ultraviolet glue. The flexible capillary metal tube is a cylindrical tube with two unsealed ends.