4 results about "Fiber crossing" patented technology

A connection system and a connection method according to the present invention use an in-facility node installed on a loop-shaped optical fiber and optical cross-connects in a plurality of external nodes arranged at different positions on the optical fiber. Among the optical cross-connects, with respect to a first optical cross-connect and a second optical cross-connect, a first optical fiber core included in the optical fiber passes through the in-facility node and the first optical cross-connect, and does not pass through the second optical cross-connect.

The invention provides a deconcentrator with optical fiber crossing and loopback functions, and relates to the technical field of optical cable joints, the deconcentrator comprises a fiber distribution box and a cover plate, the two ends and the top of the fiber distribution box are opened, the top of the fiber distribution box is provided with the detachable cover plate, a plurality of fiber winding columns are arranged in the fiber distribution box, and the fiber winding columns are arranged according to a set arc path. An optical fiber loopback channel is formed between the plurality of fiber winding columns and the box walls of the fiber distribution boxes on the two sides, an installation channel used for installing a strip-shaped crossed optical fiber is formed between the openings in the two ends of each fiber distribution box and the plurality of fiber winding columns, an insertion hole is formed in the cover plate, and when the cover plate covers the top of each fiber distribution box, the fiber winding columns penetrate into the insertion holes. The deconcentrator can realize the cross interconnection and loopback functions of the optical fibers, and solves the problems in the prior art that the bending radius of the optical fibers is too small and the optical fibers are pressed to cause breakage.

The present application relates to the field of optical communication technology, in particular to a three-dimensional fiber structure and a manufacturing method thereof. The three-dimensional fiber structure comprises at least two layers of fiber-in substrate, at least one layer of fiber-out substrate and a plurality of optical fibers; a first part of the optical fibers is fixed on the surface of any of the fiber-in substrates, and a second part of the optical fibers is fixed on the surface of any of the fiber-out substrates; the at least two layers of the fiber-in substrates are vertically stacked at different heights, and the plurality of optical fibers form a fiber cross area between the fiber-in substrates and the fiber-out substrates. The first part and the second part of the optical fibers are fixed on the surface of the fiber-in substrates and the fiber-out substrates respectively, and the fiber-in substrates are vertically stacked at different heights, so that a three-dimensional fiber cross area is formed between the fiber-in substrates and the fiber-out substrates, thereby meeting the requirement of three-dimensional fiber routing with a large height difference between the fiber-in and the fiber-out.

The invention discloses an urban road underground cavity identification, positioning and early warning system and method, and belongs to the technical field of urban road safety monitoring. The system comprises a sensing optical cable arranged along a road, a DAS demodulator, a data processing device and an early warning device. A single-line single-side or single-line double-side U-shaped loop optical fiber laying mode is adopted, the acoustic wave velocity change rate dv / v is calculated through a cross-correlation algorithm, multi-stage fusion judgment is carried out in combination with a dynamic threshold value based on numerical simulation and a field test, and multi-stage fusion judgment comprises multi-channel consistency verification, single-line double-side optical fiber cross verification and historical baseline comparison. And finally, accurate positioning and risk early warning of the cavity are realized. The method solves the problems that a traditional method cannot achieve continuous real-time monitoring, is prone to interference and is high in false alarm rate, and has the advantages of being large in coverage range, high in accuracy, high in reliability and low in deployment cost.