17 results about "Optical coefficient" patented technology

The invention discloses a thin-film barium titanate electro-optical switch unit based on a composite electrode and an array thereof. The optical switch unit comprises a first waveguide optical fiber coupling module, a second waveguide optical fiber coupling module, an optical beam splitting module, an electro-optical phase shift region, an optical beam combining module, a third waveguide optical fiber coupling module and a fourth waveguide optical fiber coupling module. Wherein the composite electrode of the electro-optic phase shift region is composed of a metal electrode and a transparent conductive layer, the electrode is closer to the waveguide by utilizing the transparent characteristic of a transparent conductive material, the coupling of a light field and an electric field is effectively enhanced, and the extinction ratio is improved. Meanwhile, a barium titanate film with a high electro-optical coefficient is adopted as a waveguide material, and the performance is further optimized, so that the electro-optical switch unit has the excellent characteristics of low-voltage driving, high extinction ratio, low insertion loss and small size.

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.

The invention discloses a nano-bubble optical coefficient measurement method based on a multilayer spherical shell Mie theory, relates to the technical field of nano-bubble and nano-particle optical property measurement, and aims to solve the problem that an existing method cannot measure the optical property of a nano-bubble, the energy of laser absorbed by nano-particles is obtained according to the change of the transmission light intensity of the nano-particles, and the optical coefficient of the nano-bubble is measured according to the change of the transmission light intensity of the nano-particles. And substituting the refractive index field into an energy equation, obtaining the temperature and density in the nano-bubble forming process through a lattice Boltzmann method, and further obtaining the optical coefficient of the nano-particles wrapped by the nano-bubbles based on the multilayer spherical shell Mie theory according to the change condition of the refractive index field along with the degree.

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.

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 provides a superlattice electro-optical thin film material and a composite film layer and an electro-optical component comprising the same. The superlattice electro-optical thin film material is composed of dielectric material layers and barium titanate layers which grow periodically and alternately, in each period, each barium titanate layer is provided with m unit cell layers, each dielectric material layer is provided with n unit cell layers, m is in the range of 5-50, and n is in the range of 1-20; wherein the material for the dielectric material layer is selected from scandate or strontium tantalum lanthanum aluminate. The electro-optical composite film layer based on the barium titanate superlattice structure solves the problem that the electro-optical performance of traditional barium titanate is degraded, and the electro-optical coefficient of the barium titanate film approaches or even exceeds the level of block barium titanate.

This invention provides a method based on MXene Ti 3 C 2 T x All-optical phase modulation device and modulation method for PDMS. This all-optical phase modulation device consists of a fiber interferometer and MXene Ti... 3 C 2 T x Two-dimensional materials, PDMS material composition, MXene Ti 3 C 2 T x Two-dimensional material was deposited onto the surface of coreless fiber II of the fiber interferometer. The surfaces of coreless fibers I and II of the fiber interferometer were also coated with PDMS material to complete the fabrication of an all-optical phase modulator. Based on MXene Ti... 3 C 2 T x The high photothermal conversion efficiency of two-dimensional materials and the high thermo-optical coefficient of PDMS material convert changes in excitation light into changes in the refractive index of PDMS material. The fiber optic interferometer senses the refractive index change of PDMS material, causing wavelength shift and phase change in the output interference spectrum. This invention optimizes the sensitivity of phase modulation, reduces device size, and enhances device reliability and practicality.

The invention belongs to the technical field of crystal materials and optics, and relates to a potassium borate niobate electro-optical crystal and a preparation method and application thereof.The chemical formula of the potassium borate niobate electro-optical crystal is K3Nb3B2O12, the crystal belongs to a trigonal system, the space group is P31m, and the cell parameters are as follows: alpha = beta = 90 degrees, gamma = 120 degrees, Z = 1, Z = 1, Z = 1, Z = 1, and Z = 1. The potassium boron niobate electro-optical crystal has the characteristics of wide transmission range, high transmittance, large electro-optical coefficient and the like, has stable physical and chemical properties and thermal properties, is not easy to deliquesce, has good mechanical properties and is easy to process.

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.

According to the present invention, it is possible to provide a joined body in which a single crystal thin film having a high electro-optical coefficient is provided on a substrate. Furthermore, according to the present invention, it is possible to provide an optical modulator using the joined body and a method for manufacturing the joined body.　This joined body (1) comprises: a substrate (10) including a single crystal of a rock salt-type structure compound, a perovskite-type oxide, or a fluorite-type oxide on one main surface (10a); and a thin film (20) comprising a single crystal of barium titanate having a (100) orientation, the thin film (20) being provided on the main surface (10a) of the substrate (10). A ferroelectric domain (30) in a direction parallel to the main surface (10a) of the substrate (10) is present inside the thin film (20), and misfit dislocations (40) are present at an interface between the thin film (20) and the substrate (10).

The present invention provides a resin material and a preparation method therefor, an optical element, and an optical device. The resin material comprises a polyetherimide resin and inorganic particles, and the absolute value of the difference between the refractive index of the inorganic particles and the refractive index of the polyetherimide resin is less than or equal to 0.15. The resin material of the present invention has the advantages of a low thermal-optical coefficient and a high light transmittance.

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 provides an anti-interference high-voltage measuring system and method, and the method comprises the steps: calculating a to-be-measured voltage delta V through measuring the accumulated phase shift delta phi of linearly polarized light with the wavelength of lambda along the length of a transverse polarized optical fiber which is spirally arranged with the electro-optical coefficient of r and the pitch angle of xi in an electric field; the high voltage between two separated points is measured in a strong interference environment. Due to the adoption of a photoelectric conversion structure principle, the device is not easily interfered by a strong current environment, is high in measurement precision, and is suitable for measuring high-voltage alternating current (AC) voltage and direct current (dc) voltage. The device does not need a complex high-voltage insulation device, electrode arrangement or a capacitive voltage divider, and has the advantages of being simple in design, small in size, light in weight and easy to install.

This invention provides a resin material and its preparation method, an optical element, and an optical device. The resin material comprises polyetherimide resin and inorganic particles, wherein the absolute value of the difference between the refractive index of the inorganic particles and the refractive index of the polyetherimide resin is less than or equal to 0.15. The resin material of this invention possesses advantages such as low thermo-optical coefficient and high light transmittance.

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.

The invention relates to the technical field of optical fiber attenuators, in particular to a light guide plate of an optical fiber attenuator, the optical fiber attenuator and an attenuation method, which have the characteristics that the absolute value of a thermal optical coefficient is less than or equal to 2.0 * 10 <-4 > / DEG C, and the deviation of a preset attenuation value can be kept within + / -0.1 dB when the network access optical power fluctuates by + / -3dB; the laser damage threshold is not lower than 10kW / cm < 2 >, and the device is used for supporting online attenuation and monitoring of high-power optical signals. According to the invention, the thermal stability and the laser damage resistance of the material are greatly improved through the cooperative limitation of the thermal optical coefficient and the laser damage threshold of the light guide sheet, and the attenuation fluctuation caused by temperature excursion cannot be generated in a high-power light field environment; meanwhile, an interface self-adaptive filling mechanism is constructed by using a specific Young modulus, an air gap at an optical fiber joint is thoroughly eradicated through flexible rheology under a standard insertion and extraction force, and reverse echoes caused by sudden change of an interface refractive index are eliminated from a physical source.