5results about How to "Low bending loss" patented technology

The optical fiber consists of four pure silica circular cores, a trench region, and a cladding. The radius of each of the four cores is ax = 2.5 μm. The center coordinates of the four cores are [coordinates missing in original text]. The inner radius of the trench region is bx = 14.4 μm, and the outer radius is cx = 23.4 μm. The remaining portion is the cladding, with the outermost cladding having a radius R = 62.5 μm. The two cores in the X direction have the same refractive index, and the two cores in the Y direction have the same refractive index, while the cores in the X and Y directions have different refractive indices. The refractive index of the two cores in the X direction is n1 = 1.44402. The refractive indices of the two cores in the Y direction are n2 = 1.44102, the refractive index of the cladding is n3 = 1.43232, and the refractive index of the trench region is n4 = 1.42881. The mode field characteristics of the spatial modes in this fiber can be changed by altering the size, position, and refractive index distribution of the core, cladding, and trench. By employing optical field modulation, the mode degeneracy of the circular core fiber is broken, achieving low intrinsic loss and low crosstalk operation. This eliminates the need for complex MIMO-DSP processing and enables good transmission for MIMO-FREE applications.

The application discloses a kind of hollow and solid core fiber hybrid fiber bundle and cable comprising it, belong to optical fiber communication technical field, including hollow optical fiber, solid core optical fiber (solid core optical fiber can be G.652D, G.654E or G.655 etc.), first layer resin and second layer resin;It is arranged at the center position of fiber bundle by hollow optical fiber, to ensure that the bending radius of hollow optical fiber is maximum when fiber bundle bends, reduce the bending loss of hollow optical fiber, while a layer of low modulus resin is coated on the outer periphery of hollow optical fiber to reduce the bending stress of hollow optical fiber;At the same time, high modulus resin is filled in the outer periphery of low modulus resin to ensure the mechanical properties of fiber bundle, and the multiple solid core optical fibers mixed in the fiber bundle are arranged as annular distribution on the outer side of hollow optical fiber by setting, to protect the middle hollow optical fiber by solid core optical fiber, further improve the mechanical strength of the whole fiber bundle.

The application discloses a waveguide bending structure based on a subwavelength Micallan lens and belongs to the technical field of integrated optics, which comprises an input port, an output port, a subwavelength Micallan lens, a first subwavelength taper coupler, a second subwavelength taper coupler, an insulator cladding, an insulating layer and a substrate layer; the input port and the output port are symmetric about the center of the subwavelength Micallan lens; the first subwavelength taper coupler, the subwavelength Micallan lens and the second subwavelength taper coupler are all composed of a periodic subwavelength grating structure; the subwavelength Micallan lens is composed of basic lens units arranged periodically with a large duty cycle on both sides and a small duty cycle in the middle, and the effective refractive index distribution thereof satisfies the reciprocal function of the hyperbolic cosine; the structure can realize low-loss and high-isolation optical path bending in a short propagation distance, break through the physical restriction between the bending radius and the bending loss, and is suitable for photonic integrated circuits and optical information processing chips.

The application belongs to the field of optical communication, optical interconnection and optical sensing, and particularly relates to a micro-ring resonator with gradually changed cross-section width of micro-ring resonant cavity, which comprises a micro-ring resonant cavity and a coupling waveguide; the cross-section width of the micro-ring resonant cavity satisfies: uniformly widening along the counterclockwise direction of the micro-ring from the center of the coupling area, reaching the maximum at the symmetrical position of the center of the coupling area relative to the center of the micro-ring, and uniformly narrowing along the counterclockwise direction of the micro-ring from the maximum, so as to limit the fundamental mode light field in the waveguide as much as possible, reduce the interaction between the light field and the side wall, and reduce the scattering loss caused by the roughness of the side wall, wherein the gradual change rates of the uniform widening and the uniform narrowing are the same and satisfy: the half angle of the width gradually changed waveguide is not greater than the mode diffusion half angle, so as to avoid the excitation of high-order modes of the input light in the micro-ring and realize the adiabatic transmission of the fundamental mode. Therefore, the scheme can reduce the transmission loss of the micro-ring resonant cavity and effectively improve the Q value of the micro-ring resonator.

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.