Precise adjustable optical fiber coupler

Abstract

The invention discloses a precise adjustable optical fiber coupler. The precise adjustable optical fiber coupler comprises a first tapered optical fiber, a second tapered optical fiber, a fine handleand a microsphere, wherein the first tapered optical fiber comprises a first port and a second port; the second tapered optical fiber comprises a third port and a fourth port; the first tapered optical fiber and the second tapered optical fiber are located on two opposite sides of the microsphere; the fine handle is fixed on the microsphere; the second tapered optical fiber is in contact with themicrosphere; the second tapered optical fiber and the microsphere keep fixed positions; the second tapered optical fiber keeps a vertical relationship with the fine handle; the first tapered optical fiber is in contact with the microsphere; and the positions of the first tapered optical fiber and the microsphere are not fixed. The precise adjustable optical fiber coupler is high in coupling efficiency and the coupling proportion thereof can be precisely adjusted; at the interval of a free spectral range, the precise adjustable optical fiber coupler has a working wavelength and can be matched with a wavelength division multiplexing technology for use; and the precise adjustable optical fiber coupler is wide in working wavelength range, simple in process, low in cost and easy to realize industrial mass production.

Description

technical field [0001] The invention belongs to the technical field of optical fiber couplers, and in particular relates to a precision adjustable optical fiber coupler. Background technique [0002] The optical fiber coupler is an optical device that realizes the distribution or combination of optical signal power among different optical fibers. It is composed of the mutual exchange of guided wave energy in the core region of different optical fibers adjacent to the optical fiber surface. According to the type of optical fiber used, it can be divided into multimode optical fiber, Single mode fiber and polarization maintaining fiber coupler etc. For a waveguide fiber coupler, it is generally a component with a Y-shaped branch, which can be used to divide the optical signal input by an optical fiber into equal parts. When the opening angle of the coupler branch increases, the leakage into the cladding The light will increase so that the excess loss is increased, so the openi...

AI Technical Summary

Problems solved by technology

The current fiber coupler has technical problems that the coupling ratio is not easy to control, the coupling ratio cannot be adjusted, or the adjustable accuracy is limited.

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