11results about How to "Reduce nonlinear effects" patented technology

The invention relates to a bending-resistant all-solid-state microstructure optical fiber. The bending-resistant all-solid-state microstructure optical fiber comprises a fiber core region and an inner cladding, the fiber core area comprises a first filling round hole, a first annular fiber core and a first groove ring; the first filling circular hole is located in the center of the fiber core area and has a first refractive index. The first annular fiber core wraps the first filling round hole and has a second refractive index; the first groove ring wraps the first annular fiber core and has a third refractive index; the inner cladding wraps the fiber core area and has a fourth refractive index; a plurality of second filling circular holes are distributed in the inner cladding, and the second filling circular holes have a fifth refractive index; the first refractive index is higher than the second refractive index; the second refractive index is higher than the fourth refractive index; the fourth refractive index is higher than the third refractive index; the third refractive index is higher than the fifth refractive index. According to the invention, the technical problem of poor bending resistance on the premise of large-mode-field transmission in the prior art can be solved.

The application discloses an oil film damper damping structure, which comprises a bearing, a support seat and an adjusting structure, wherein the bearing comprises a bearing outer ring and a bearing inner ring, the bearing inner ring is suitable for being connected with a rotor; the inner ring of the support seat is coaxially arranged with the bearing outer ring to enclose an oil film cavity suitable for containing lubricating oil; the adjusting structure is fixedly arranged in the oil film cavity, and the adjusting structure is fixed on the bearing outer ring or the inner ring of the support seat; the adjusting structure comprises a flow control part, the flow control part comprises a streamlined surface and a flow resistance plane which are connected with each other, and the streamlined surface and the flow resistance plane are used for controlling the flow speed of the lubricating oil; the friction coefficient of the flow resistance plane is greater than that of the streamlined surface. The structure plays a damping role under the action of the friction resistance and the pressure difference resistance of the lubricating oil on the adjusting structure, the control effect of the oil film extrusion flow is strengthened, and the use and application range of the extrusion oil film damper are increased.

The invention belongs to the technical field of fiber lasers, and discloses a cladding fiber grating which comprises a cladding area and a fiber core area, and the cladding area is inscribed to form a cladding grating of a periodic structure. The cladding fiber bragg grating is adopted, residual pump light which is not absorbed in the fiber laser is reflected back to the gain fiber to be absorbed again, the length of the gain fiber in the fiber laser can be shortened to 30%-50% of the length of the gain fiber in a traditional scheme, and the cost of the fiber laser is reduced; meanwhile, the gain optical fiber with the short length can effectively reduce accumulation of the nonlinear effect, and laser output with higher power can be achieved.

The invention relates to the technical field of optical communication, in particular to a silicon optical chip, an external cavity laser and a method for restraining a micro-ring nonlinear effect. The P-doped region and the N-doped region at the two sides of the micro-ring resonant waveguide are respectively connected with the ground and an input voltage through an electrical connection module, so that a transverse electric field is formed in the micro-ring resonant waveguide, and free carriers generated after light passes through the micro-ring resonant waveguide are removed through the transverse electric field; and on the other hand, the P-doped region and the N-doped region are respectively connected with an external input voltage and the ground through the electrical connection module, so that bias voltage control on the two sides of the micro-ring resonant waveguide can be realized on the basis of not increasing redundant pins, free carriers generated in the micro-ring resonant cavity are eliminated, and the reliability of the micro-ring resonant cavity is improved. Therefore, the nonlinear effect of the micro-ring resonant cavity is effectively suppressed, and the micro-ring resonant cavity has the advantages of being simple in structure and meeting the miniaturization requirement.

The embodiment of the invention provides an elastic wave device and an electronic product. The elastic wave device comprises a piezoelectric layer; the IDT electrode layer is arranged on the piezoelectric layer, the IDT electrode layer comprises a first bus bar and a second bus bar which are oppositely arranged along a first direction, and a part between the first bus bar and the second bus bar is defined as an interdigital region; the electrode fingers are arranged in the interdigital area, the electrode fingers comprise a plurality of first electrode fingers and a plurality of second electrode fingers which are arranged at intervals in the second direction, first intervals are formed between the first electrode fingers and the second bus bars, and first intervals are formed between the second electrode fingers and the first bus bars; the interdigital area comprises a central area and additional film areas, the two edges of the central area in the first direction do not exceed the edges of the sides, away from the bus bar, of the first electrode fingers and the second electrode fingers, and the additional film areas are arranged on the two sides of the central area; and the additional film is arranged on the piezoelectric substrate, the additional film is arranged in the additional film area, and the material of the additional film is silicon dioxide, silicon oxide, silicon nitride, HfO2, silicon, resin, PI or titanium oxide.

This invention discloses a graded-index non-zero dispersion-shifted optical fiber based on orbital angular momentum modes, comprising an optical fiber body including a ring core and an optical fiber cladding surrounding the ring core. The optical fiber cladding includes a circular region inside the ring core and an outer optical fiber cladding outside the ring core. This invention aims to provide a feasible optical fiber structure for suppressing four-wave mixing to meet the requirements of low-dispersion transmission of multiple orbital angular momentum modes.

This invention discloses a submarine cable acoustic monitoring system based on scattering-type fiber optic fingerprint technology, belonging to the field of fiber optic sensing technology. The system includes a light source module, a transmitting module, a submarine cable fiber optic sensing unit, a dual-balanced detector module, and a signal processing module. In the light source module, the continuous light output from the laser is split into a probe light and a local reference light by a dynamic beam splitter. The probe light is modulated and injected into the submarine cable fiber, and the resulting backscattered Rayleigh light carries acoustic information back. The dual-balanced detector module has a built-in light intensity monitoring unit that monitors the light intensity of the reference light and the scattered light in real time. By comparing the two intensities, it sends a feedback control signal to the dynamic beam splitter, dynamically adjusting the splitting ratio to maximize the interference term intensity coefficient, thereby improving the signal amplitude and sensing sensitivity. This invention solves the problems of limited sensing distance and high laser linewidth requirements in traditional systems, and is suitable for long-distance, high-reliability submarine cable acoustic event monitoring and location in deep-sea environments.

The utility model discloses a kind of annular light beam laser beam combiner based on spindling annular optical fiber, annular light beam laser beam combiner uses (N+1)*1 combiner, the input end of annular light beam laser beam combiner includes a center optical fiber and N root side fiber, and the output fiber of annular light beam laser beam combiner is 1 spindling annular optical fiber.

The utility model provides a kind of continuous fiber laser, it is related to laser technical field.Fiber laser includes few-mode laser oscillation cavity, pump source mode filter and first cladding light filter;Pump source injects pump light to few-mode laser oscillation cavity;Few-mode laser oscillation cavity converts received pump light into signal light, and output to mode filter, mode filter filters high-order mode in signal light into optical fiber cladding, and fiber core is only for single fundamental mode signal light to pass;First cladding light filter peels high-order mode light and residual pump light.The utility model provides fiber laser, by few-mode laser oscillation cavity, reverse pump light is converted into signal light, and signal light is transmitted to mode filter, mode filter can filter out high-order mode in signal light except fundamental mode, realize single-mode laser output, and first cladding light filter is set in the output end of fiber laser, can guarantee that only fundamental mode is included in signal light output by fiber laser.

This invention relates to a large effective area ultra-low attenuation multi-core optical fiber and its applications. The large effective area ultra-low attenuation multi-core optical fiber includes at least four core layers and a common cladding surrounding and covering the core layers. The core layers are symmetrically and uniformly distributed across the fiber cross-section. Each core layer is surrounded by an inner cladding and a recessed inner cladding layer, arranged sequentially from the inside to the outside. The common cladding layer includes a first outer cladding layer and a second outer cladding layer. The relative refractive index difference between the first and second outer cladding layers increases from the inside to the outside. This invention, through a multi-layer cladding structure of "inner cladding-recessed inner cladding-first outer cladding-second outer cladding layer," combined with the increasing relative refractive index difference between the first and second outer cladding layers from the inside to the outside, achieves a synergistic improvement in ultra-low attenuation, large effective area, ultra-low inter-core crosstalk, excellent bending resistance, and good system compatibility, providing an ideal transmission medium for long-distance, high-capacity space-division multiplexing optical communication systems.

The application discloses an anti-resonant fiber optimization design method and system for infrared waveband transmission, and belongs to the technical field of optical fiber communication, and comprises the following steps: constructing an air-core anti-resonant fiber model for cooperatively optimizing limited loss and bending loss in a target infrared waveband, wherein the air-core anti-resonant fiber model has a five-tube nested structure; selecting a group of key structure parameters to be optimized; determining the theoretical value range of the large-circle wall thickness and the small-circle wall thickness based on the anti-resonant optical principle, and combining with the preparation process constraint to determine the common feasible domain of all the key structure parameters; and cooperatively optimizing through phased parameterization scanning, wherein the optimization parameter subspace is determined through coarse scanning, and the optimal structure parameter combination meeting the preset loss threshold is screened out in the subspace through fine scanning. According to the application, the fiber structure parameters are cooperatively optimized in the 808 nm waveband, the limited loss and the bending loss are significantly reduced, and good process feasibility is ensured.