33results about How to "High thermo-optic coefficient" patented technology

An optical fiber based polymer core sensor includes an optical fiber having a core and an end having a cured polymer core affixed to the core of the optical fiber. The cured polymer core extends outward from the end of the optical fiber and has a diameter approximately equal to the core of the optical fiber. Note the cured polymer core can be substantially cylindrical, tapered or geometrically shaped. The optical fiber based polymer core sensor can be used to measure a temperature, measure a strain, measure a distance, measure a refractive index, detect or measure an analyte, detect a toxin, detect a biological agent, monitor a chemical process, or a combination thereof

The present invention is array waveguide grating of organic polymer and its making process. The array waveguide grating is made through the process of painting lower cladding polymer onto monocrystal silicon chip as substrate, stoving and painting polymer core layer material; stoving, evaporating or sputtering aluminum film, painting photoresist and photoetching through array waveguide grating mask; oxygen reacting ion etching to obtain array waveguide grating pattern on polymer core layer material; painting upper cladding polymer material and stoving to obtain array waveguide grating. The array waveguide grating device and its making process has easily control of refraction index difference between polymer core layer and cladding material, easy control of thickness of each layer, flexible selection of the core layer and the cladding material to realized optimized design.

The invention provides an SPR (Surface Plasmon Resonance) based photonic crystal fiber temperature sensor, which is provided with a liquid core located at the center of an optical fiber and metal coating channels symmetrically distributed around the liquid core in a sensing area, wherein the liquid core can be butted with a conventional single-mode optical fiber to perform long-range detection; dual metal coating channels are adopted, the diameter of air holes between the fiber core and the metal channels is reduced, the sensing strength is effectively enhanced, the signal to noise ratio is higher, and the resonance strength of the sensor can reach up to 327dB/cm; the fiber core and the two metal coating channels are filled with a liquid material with a high thermo-optical coefficient, andthe refractive index of the material is adjusted through adjusting the mixing proportion of the liquid material. The SPR based photonic crystal fiber temperature sensor is high in sensitivity, high in signal to noise ratio, simple in structure and tiny in volume, and specific light source bandwidth and signal strength requirements can be met within a certain range through adjusting the SPR strength and the resonant wavelength.

The invention belongs to the field of organic/inorganic composite material synthesis and relates to preparation of azo polymer and functionalized graphene oxide series compounds, in particular to a preparation method and application of an NCO functionalized graphene/azo polymer composite waveguide thermo-optical material. The preparation method comprises the steps of firstly, preparing graphite oxide through a Hummers method, and obtaining graphite oxide dispersion liquid through ultrasonic peeling; then, making toluene diisocynate react with disperse red-19 containing two hydroxyl groups under the action of T-12, and obtaining azobenzene prepolymer with the end capped through hydroxy; subsequently, making IPDI react with the graphite oxide dispersion liquid, and preparing and obtaining isophorone diisocyanate functionalized graphite oxide; then, adding the graphite oxide to the obtained azobenzene prepolymer with the end capped through hydroxy for coducting a reaction, and finally obtaining the azo polyurethane/isophorone diisocyanate functionalized graphite oxide nanometer composite material. The material has a high thermo-optical coefficient (dn/dT) and can be applied to research of a novel digital thermo-optical switch which is low in driving power and high in response speed.

The invention discloses a tunable mode converter and a manufacturing method thereof, and belongs to the technical field of planar optical waveguide devices. The tunable mode converter is based on an MZI optical waveguide structure. Along the propagation direction of light, the tunable mode converter is formed by an input few-mode straight waveguide, a 3-dBY branch beam splitter, a first input straight waveguide, a second input straight waveguide, a first 3-dBY branch beam splitter, a second 3-dBY branch beam splitter, four modulation arms, a first 3-dBY branch coupler, a second 3-dBY branch coupler, a first output straight waveguide, a second output straight waveguide, a 3-dBY branch coupler, an output few-mode straight waveguide and four parallel heating electrodes. The tunable mode converter comprises a silicon wafer substrate, a silicon dioxide lower cladding, an optical waveguide core layer with a strip-shaped structure and a polymer upper cladding 34 structure from bottom to top. The heating electrode is located right above the modulation arm, and the refractive index of the core layer material is higher than that of the upper cladding layer material. According to the invention, the modulation arm of the MZI structure is modulated to realize the purpose of mutual conversion of four optical modes.

The invention discloses an asymmetric MZI optical waveguide-based temperature sensor and preparation method thereof, and belongs to the technical field of planar optical waveguide sensors and preparation thereof. The whole sensor is based on an MZI optical waveguide structure, and consists of an input straight waveguide, a 3-dB Y branch beam splitter, a reference arm, a sensing arms parallel to the reference arm, and a 3-dB Y branch coupler in sequence from left to right, and consists of a silicon wafer substrate, a polymer lower coating layer prepared on the silicon wafer substrate and provided with a groove structure, an optical waveguide core layer prepared on the polymer lower coating layer and provided with an inverted ridge type waveguide structure, and a polymer upper coating layerprepared on the optical waveguide core layer in sequence from top to bottom. The waveguide type temperature sensor combines the advantages that the MZI optical waveguides are strong in interference effect and the organic polymer materials are large in thermos-optical coefficient; and through adopting two organic polymer materials with different thermo-optical coefficients for optical waveguide core layers of the sensing arms and the reference arms of the traditional ZMI waveguide temperature sensors, the aim of detecting the practical external environment temperature is achieved.

The invention, which belongs to the technical field of a planar optical waveguide sensor and preparation thereof, provides an asymmetric MZI optical waveguide temperature sensor based on a loaded strip-shaped structure and a preparation method thereof. The asymmetric MZI optical waveguide temperature sensor comprises an input straight waveguide, a 3-dB Y-branch beam splitter, two asymmetric reference arm and sensing arm, a 3-dB Y-branch coupler and an output straight waveguide. The reference arm and the sensing arm include silicon substrates, lower polymer claddings with double-waveguide groove structures, reference arm optical waveguide core layers and sensing arm optical waveguide core layers, and unexposed and exposed organic-inorganic hybrid material flat plates, and upper polymer claddings that are arranged successively from bottom to top. According to the invention, with the organic-inorganic hybrid materials containing the chromophore molecules on the surface of the photo-bleaching sensor arm, the refractive index changes, the difference of the optical mode field with the environment change in light transmission of two interference arms is increased further, and the output light intensity change is increased. Therefore, the sensor has an important practical application value.

The invention discloses a double-solid-core optical fiber photo-thermal phase modulator coated with a heat-sensitive material, and belongs to the technical field of optical fiber phase modulation. Thedouble-solid-core optical fiber photo-thermal phase modulator is formed by sequentially connecting a signal light source, a pump light source, a 3dB coupler, a circulator, a single-mode optical fiber, a section of double-solid-core optical fiber and a detector. The single-mode optical fiber and the double-solid-core optical fiber are directly aligned and welded, light in the single-mode optical fiber is coupled into two fiber cores of the double-solid-core optical fiber by utilizing a fused biconical taper technology at a welding spot, and a Michelson interferometer is formed by utilizing reflection of the end surfaces of the fiber cores. The cladding near one fiber core of the double-solid-core optical fiber is polished by using a wheel type side polishing technology, so that the fiber core is exposed in the air. In order to increase the modulation degree of the phase modulator, the fiber core with the polished side surface is coated with a heat-sensitive material. The phase modulator is simple to manufacture and easy to be interconnected with a single-mode optical fiber, and the two fiber cores are arranged in one waveguide, so that the modulator is high in integration degree, and the response is approximately linear. The modulator can be widely applied to the aspect of phase modulation.

The invention relates to an optical modulator. The optical modulator comprises a substrate, a first electrode, a second electrode, a waveguide and a heat-inducing layer, wherein the first electrode, the second electrode and the waveguide are arranged on the same surface of the substrate at intervals; one end of the heat-inducing layer is connected with the first electrode, and the other end of theheat-inducing layer is connected with the second electrode; sequentially arranged through holes are arranged on the waveguide along an optical transmission direction; the heat-inducing layer at leastcovers the through holes, and the heat-inducing layer is used for converting electric energy of an external electric field into heat energy, so that the temperature of each of the heat-inducing layerand the temperature of the waveguide is increased, the refractive indexes of the waveguide and the heat-inducing layer or the waveguide are changed, the intensity of light transmitting through the waveguide is changed, and the regulation and control of a light spectrum are realized. The optical modulator disclosed by the invention has high modulation depth, small device area, and less energy consumption.

The invention discloses a wavelength division multiplexing system with a power balancing function and a preparation method thereof, and belongs to the technical field of silicon dioxide/polymer mixed waveguide optical integrated chips. The multi-channel wavelength division multiplexer and the variable optical attenuator array are integrated on the same chip, a wide-spectrum light source is coupled into the wavelength division multiplexer, and light with different wavelengths is divided into different channels through the wave division effect of the wavelength division multiplexer and then enters different variable optical attenuators; because the power among the channels of the wavelength division multiplexer is unbalanced, the power balance of the output channels can be realized by tuning the variable optical attenuator. According to the wavelength division multiplexing system with the power balancing function, the silicon dioxide/polymer mixed waveguide PLC technology is adopted, and the power consumption of the system is reduced by utilizing the advantages that the silicon dioxide lower cladding is good in heat dissipation and low in loss and the thermo-optical coefficient of the polymer core layer and the polymer upper cladding is large. The method is very suitable for the fields of optical communication, optical calculation and the like, and has a very strong application prospect.