32 results about "Thermo-optic coefficient" patented technology

A temperature measurement device (1) comprises: a light emission unit (10) that generates coherent, continuous measurement-light; a light detection unit (30) that detects reflected light or transmitted light of the continuous measurement-light which is projected onto a sample (50) to be measured; and an analysis unit (42) that calculates a temperature distribution of the sample (50) to be measured on the basis of the intensity of the reflected light or the transmitted light detected by the light detection unit (30). The analysis unit (42) calculates the optical thickness of the sample (50) to be measured from a temporal change in the intensity of the reflected light or the transmitted light and, by using a refractive index distribution model representing the relationship between the optical thickness and a refractive index distribution in the thickness direction of the sample (50) to be measured at the time of a temperature change, calculates the refractive index distribution from the optical thickness, and calculates the temperature distribution of the sample (50) to be measured by converting the refractive index distribution into the temperature distribution on the basis of the thermo-optical coefficient of the sample (50) to be measured.

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.

The utility model discloses a polydimethylsiloxane sensitization optical fiber temperature and strain simultaneous measurement sensor. The sensor comprises an incident optical fiber, an optical fiber coupler, an optical fiber patch cord, a transmission optical fiber, a sensing cavity, a reference cavity and an emergent optical fiber, an optical signal enters the optical fiber coupler through the incident optical fiber and is divided into two beams of equal-intensity light in the coupler, the two beams of light are respectively input into the transmission optical fiber through the optical fiber patch cord and then enter the sensing cavity and the reference cavity which are coated with the polydimethylsiloxane, and the light is reflected by the cavities to form interference; the interference light is transmitted back to the optical fiber coupler through respective transmission optical fibers, so that a vernier spectrum is formed; the emergent optical fiber transmits an optical signal containing temperature strain information to a spectrograph, trough drift is analyzed through a dual-wavelength matrix demodulation method, and simultaneous measurement is achieved. According to the utility model, the vernier effect, the structural advantages of the Fabry-Perot interferometer and the advantage of high thermo-optic coefficient of polydimethylsiloxane are combined, and the vernier interferometer has the advantages of low cost, high sensitivity, high stability and the like.

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 relates to the technical field of optical communication, and provides a Mach-Zehnder electro-optical modulator, a preparation method thereof and optical communication equipment. The Mach-Zehnder electro-optical modulator comprises a lithium niobate waveguide layer which is used for responding to a direct current bias electric signal so as to adjust a preset optical parameter of an input optical signal; the negative thermo-optical coefficient functional layer is positioned on the surface of the lithium niobate waveguide layer; wherein the lithium niobate waveguide layer and the negative thermo-optical coefficient functional layer form a combined layer, and the equivalent thermo-optical coefficient of the combined layer is smaller than a preset thermo-optical coefficient; and the transmission electrode is positioned on the surface, deviating from the lithium niobate waveguide layer, of the negative thermo-optical coefficient functional layer and is used for introducing a direct-current bias electric signal. According to the Mach-Zehnder electro-optical modulator, the defect that heat dissipation needs to be increased through a temperature control chip or manufacturing of a heat sink in the prior art is overcome, the state of the electro-optical modulator can be kept near the optimal direct-current bias point only by controlling parameters of the negative thermo-optical coefficient functional layer, and the purpose of restraining the heat effect of the electro-optical modulator is achieved.

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 relates to a micro-ring filter based on a polymer cladding. The micro-ring filter comprises an upper cladding, a micro-ring filter and a lower cladding, the upper cladding layer is a PDMS (Polydimethylsiloxane) polymer; the lower cladding is made of silicon dioxide; the micro-ring filter comprises an input grating coupler connected with an input light source, and the input light source sequentially passes through the input grating coupler, an input conical waveguide, a straight-through waveguide and a straight-through end output conical waveguide and is finally output from a straight-through end output grating coupler; and the straight waveguide is matched with an annular waveguide. Through the complementary design of the negative thermo-optical coefficient of the PDMS upper cladding and the positive thermo-optical coefficient of the silicon core layer, the self-shielding of the micro-ring resonant wavelength to the external temperature change is realized.

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.