9 results about "Core (optical fiber)" patented technology

The optical fiber coupler array can be capable of providing a low-loss, high-coupling coefficient interface with high accuracy and easy alignment between a plurality of optical fibers (or other optical devices) with a first channel-to-channel spacing, and an optical device having a plurality of closely-spaced waveguide interfaces with a second channel-to-channel spacing, where each end of the optical fiber coupler array can be configurable to have different channel-to-channel spacing, each matched to a corresponding one of the first and second channel-to-channel spacing. Advantageously, the refractive indices and sizes of both inner and outer core, and/or other characteristics of vanishing core waveguides in the optical coupler array can be configured to reduce the back reflection for light propagating from the plurality of the optical fibers at the coupler first end to the optical device at the coupler second end, and/or vice versa.

The invention provides a multi-parameter measuring device based on a double-clad optical fiber. The device comprises a light source 1, a single-mode optical fiber 2, a polarizer 3, a polarization controller 4, the double-clad optical fiber 5 with a tilted grating 6 and a signal demodulator 7 which are connected in sequence. The double-clad optical fiber is provided with an inner cladding and an outer cladding, and the tilted grating is engraved on a fiber core. Light emitted by the light source forms a comb-shaped transmission spectrum after passing through the tilted grating, and the transmission spectrum comprises a Bragg resonance peak, an inner cladding resonance peak and an outer cladding resonance peak. When the external environment of the tilted grating changes, the transmission spectrum of the tilted grating changes, and real-time detection of parameters such as temperature, bending, axial strain and refractive index is realized by monitoring the changes of the wavelength and intensity of the resonance peaks, which has the advantages of small size, quick response, high sensitivity and the like.

The invention discloses a single-polarization low-optical-noise space micromirror coupling system and a digital signal processing system. An optical signal is input from a first polarization maintaining optical fiber interface and sequentially passes through a first aspherical lens, a first spectroscope, the lower surface of a plane beam splitter and the upper surface of the plane beam splitter; a part of the light beam is transmitted and output to a second spectroscope and a fifth aspheric lens, and a part of the light beam is reflected to a third aspheric lens and is coupled into a hollow-core photonic crystal fiber resonant cavity through a second hollow-core photonic crystal fiber interface; after being transmitted for a circle in the hollow-core photonic crystal fiber resonant cavity, the light beams are emitted from the first hollow-core photonic crystal fiber interface and pass through the upper surfaces of the fourth aspherical lens and the plane beam splitter, and part of the light beams are directly transmitted to enter the hollow-core photonic crystal fiber resonant cavity again; and the other part of the light beam is reflected to the second spectroscope and the fifth aspherical lens again to form multi-beam interference, and is output through the second polarization-maintaining optical fiber interface to form a clockwise light path, otherwise, the light path is an anticlockwise light path.

The invention discloses a polarization-maintaining optical fiber connector. The connector comprises an interface assembly which comprises an outer pipe body, a guide sleeve, and a first insertion core; an adjusting ring which is arranged on the outer pipe body in a sleeving manner and can rotate relative to the outer pipe body; an insertion core assembly which comprises a second insertion core anda tail handle, wherein the butt joint end of the second insertion core is inserted into the guide sleeve in the axial direction and is in butt joint with the butt joint end of the first insertion core, and the tail handle is inserted into the adjusting ring so that the insertion core assembly can rotate synchronously when the adjusting ring is rotated; and a shell arranged on the outer tube bodyand the tail handle and used for limiting the axial relative displacement between the interface assembly and the insertion core assembly. According to the polarization-maintaining optical fiber connector provided by the invention, calibration of fast and slow axes in a polarization-maintaining optical fiber is realized by rotating the second insertion core, and various problems caused by directlyrotating the polarization-maintaining optical fiber in the prior art can be avoided.

The invention discloses a single motor input optical fiber grinding machine core assembly. The assembly mainly comprises a grinding base disc, a grinding auxiliary disc, a main motor, and a grinding track; an optical fiber ceramic insert core to be ground is arranged on the upper part of the grinding base disc; a grinding connecting disc is connected with the bottom of the grinding base disc; andthe grinding connecting disc is rotationally connected with the main motor in a speed regulation mode. Compared with an original grinding structure, an auxiliary motor drives the grinding auxiliary disc to rotate, the grinding auxiliary disc is installed at the bottom of the grinding base disc, the grinding base disc generates the grinding track in the process of grinding the optical fiber ceramicinsert core, and main parameters of the grinding track include spiral spacing and grinding main path. The beneficial effects include: a single motor input optical fiber grinding machine core assemblyis designed, runner system reasonable distribution motion parameters are adopted, orbit rotation and autorotation are integrally combined via single motor input, stability of a grinding curve is guaranteed, and grinding quality is ensured.

A core (11) includes a first region (11a) and a second region (11b). The first region (11a) is a region of a radius ra from a central axis and has an active element that is excited by excitation light added thereto. The second region (11b) is a region surrounding the first region (11a) without a gap and extending to an outer peripheral surface of the core (11), and does not have the active element added thereto. When the radius of the core (11) is d, 0.1d<ra<d, and when the distance from the central axis in a radius direction of the core (11) is r, an average value of the concentration of the active element in a region where 0<=r<=0.1d is higher than an average value of the concentration of the active element in a region where 0.1d<r<=ra. In a region where 0.2d<r<=0.9d, there is at least one maximum value position at which the refractive index is higher than an average value of refractive index in a region where 0<=r<=0.9d and is at a maximum.