N type fiber coupler

Abstract

The invention discloses an N type fiber coupler suitable for a fluorescence measuring system and a fiber sensing system. The structure of the N type fiber coupler is shown in picture 1 and the N typefiber coupler can be made of single-mould or multi-mould single-wire fibers or multi-wire optical fibers. The N type fiber coupler has the characteristics of two coupling ends: when the fiber coupleris made of the single-wire fibers, the fiber coupler is made of three single-wire fibers 1, 2 and 3; one side of the single-wire fiber 1 and one side of the single-wire fiber 2 are coupled into a coupling end A; the other end of the single-wire fiber 2 and one side of the single-wire fiber 3 are coupled into a coupling end B; the making technology of a universal Y type fiber coupler and an X typefiber coupler can be used for finishing the coupling step and when the fiber coupler is made of the multi-wire optical fibers, the fiber coupler is made of three optical fiber wires 1, 2 and 3 according to required bundle diameter. The N type fiber coupler is especially suitable for the fluorescence measuring system of top excitation and top reception and the fluorescence measuring system of the Ntype fiber coupler has the advantage of synchronously transmitting exciting light signals, fluorescence signals and three-way optical signals for monitoring light source intensity.

Description

Technical field [0001] The patent of the present invention belongs to the field of optical fiber passive coupling devices in optical technology, and also relates to a fluorescence measurement technology applying the present invention. Background technique [0002] Optical fiber coupler is a functional device to realize optical signal splitting / combining. Has two forms: [0003] 1) Y-type fiber coupler, that is, tree coupler. The light input from one end can be divided into two by it, so it is sometimes referred to as a 1×2 coupler; its variant is a tree coupler (1×N, N>2). [0004] 2) X-type fiber coupler, that is, star coupler. Sometimes referred to simply as a 2×2 coupler; its variant is an N×N star coupler (N>2). [0005] Single-filament optical fiber (including multi-mode optical fiber and single-mode optical fiber) and multi-filament optical fiber can be made into X-type and Y-type fiber couplers. Optical fiber couplers, especially Y-type optical fiber couple...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the existing Y-type fiber coupler, when the X-type fiber coupler is applied in sensing technology, optical measurement technology and optical spectroscopy technology, it cannot simultaneously transmit the three-way optical signals of excitation light, fluorescence signal reception and light source intensity monitoring This difficulty, a kind of N-type optical fiber coupler (as figure 2 shown) can simultaneously realize the transmission of three optical signals for light source excitation, fluorescence signal reception and light source intensity monitoring

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