End pump and side pump combined signal pump beam combiner

Abstract

The utility model discloses an end-pump and side-pump combined signal pumping beam combiner, which belongs to the technical field of fiber lasers and comprises a signal fiber and a plurality of pumping fibers, the plurality of pumping fibers are coupled into the pumping fiber in a fused biconical taper mode to form a coupled pumping fiber, and the coupled pumping fiber is coupled with the signal fiber. The end portions of the coupling pumping optical fibers are fused into the signal optical fiber in a side pumping mode, and the number of the coupling pumping optical fibers with the end portions fused into the signal optical fiber in the side pumping mode is at least two. According to the end pump and side pump combined signal pumping beam combiner provided by the utility model, a mode of combining end face pumping and side face pumping is adopted, the number of pumping arms of the signal pumping beam combiner is increased, the upper limit of the coupling pumping power of a single beam combiner is improved, and the novel structure can solve the problem that the pumping arms of the side face pumping beam combiner are insufficient.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of optical fiber laser, concretely relates to a signal pumping combiner combined with end pump and side pump. BACKGROUND

[0002] The laser is composed of a resonant cavity, a gain medium and a pump source, the optical fiber laser is a full optical fiber structure, the function of the combiner is to couple the energy of the pump source into the gain medium in the resonant cavity through the optical fiber, the gain medium is a gain optical fiber, the gain optical fiber is composed of a fiber core, a cladding and a coating layer, the fiber core has different sizes, and there are different diameters such as 14um, 20um and 30um in industry. The matching optical fiber is used to connect various optical fiber devices and the gain optical fiber. The combiner is divided into two kinds, the first kind of end pump combiner is fused with the matching optical fiber after being pulled by a plurality of pump optical fibers (usually 105 / 125, 135 / 155 and 220 / 242), and this kind of combiner can only be used for pumping. The other kind of side pump combiner is composed of a center signal optical fiber and two side pasted pump optical fibers, and since the input and output optical fibers are of the same type, the pump light and the signal light can be coupled into one optical fiber at the same time.

[0003] At present, the signal pumping combiner of the side pump is a 2+1 structure, that is, composed of two pump optical fibers and one signal optical fiber, and the input and output ends of the signal optical fiber are the same type of optical fiber. Limited by the number of pump optical fibers, it can only be fused with two semiconductor pump sources, and the low pump power cannot meet the demand of high power amplification. UTILITY MODEL CONTENTS

[0004] The signal pumping combiner has only two pump arms, and when high power is required, the number of pump arms is not enough, and it is necessary to additionally fuse with an end pump combiner or connect a side pump combiner to increase the pump energy, and the utility model aims at the shortage of the prior art and provides a signal pumping combiner combined with end pump and side pump, which can save one end pump combiner when high power pumping demand with multiple pump arms is required, and simplifies the system structure.

[0005] The utility model realizes the following technical scheme:

[0006] A signal pumping combiner combined with end pump and side pump, comprising one signal optical fiber and a plurality of pump optical fibers, the plurality of pump optical fibers are coupled into one pump optical fiber by a fusion-pulling method to form a coupled pump optical fiber, and the coupled pump optical fiber adopts a side pumping mode to fuse the end into the signal optical fiber.

[0007] Further, the coupled pump optical fiber, which fuses the end into the signal optical fiber in the side pumping mode, is at least two.

[0008] Compared with the prior art, the utility model has the beneficial effects that:

[0009] The signal pump combiner with the end pump and the side pump combination of the utility model adopts the combination mode of end face pumping and side face pumping, increases the number of pumping arms of the signal pump combiner, improves the upper limit of the coupling pumping power of a single combiner, and the new structure can solve the problem of insufficient pumping arms of the side face pump combiner, and one combiner can solve the demand of coupling multiple pumping optical fibers during signal pumping. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other implementation drawings can be derived from the provided drawings without creative labor.

[0011] Fig. 1 It is a signal combiner schematic diagram of end pump and side pump combination;

[0012] Fig. 2 It is a pump optical fiber end pump coupling schematic diagram;

[0013] Fig. 3 It is a pump coupling optical fiber side pump fusion signal optical fiber schematic diagram.

[0014] The reference signs in the drawing: 1-pump optical fiber, 2-coupling pump optical fiber, 3-signal optical fiber. DETAILED DESCRIPTION

[0015] The exemplary embodiments of the utility model will be described in detail below with reference to the drawings. Although the exemplary embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the utility model and to enable the scope of the utility model to be fully conveyed to those skilled in the art. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0016] Reference Figs. 1 to 3 The utility model discloses a kind of signal pump combiner of end pump and side pump combination, including signal optical fiber 3 and multiple pump optical fibers 1, 3 pump optical fibers 1 are coupled into 1 pump optical fiber by fusing taper mode and form coupling pump optical fiber 2, then 2 coupling pump optical fiber 2 is fused into signal optical fiber 3 in the mode of side face pumping with end.

[0017] The utility model discloses a kind of end pump side pump combined signal pump combiner end pump structure can support multiple pump optical fiber coupling, side pump structure can support signal optical fiber through reserve 2+1 combiner function.Two kinds of structures are placed in same combiner, and constitute the signal combiner that can support multiple pump optical fiber.

[0018] For example, in 3kW fiber laser, 2+1 combiner is needed to use for backward pumping, limited by pump arm, only 2 pump sources can be fused.While end pump side pump combined signal pump combiner of the utility model can be coupled into multiple pump optical fibers, without increasing additional combiner, it can be realized.

[0019] When pump arm of side pump combiner is not enough in actual use, one end pump combiner or multiple side pump combiners can be fused on pump arm of side pump combiner in series, but this needs to use one combiner additionally, and increase system complexity.

[0020] The above has carried out detailed description to the utility model through embodiment, but the content described can only be exemplary embodiment of the utility model, and cannot be considered to be used for limiting the implementation range of the utility model.The protection scope of the utility model is defined by claim.The technical solution described in the utility model, or the technical solution inspired by the utility model technical solution in the art of the utility model, within the utility model essence and protection scope, is designed to achieve the above technical effect, or equivalent changes and improvements to the application scope, should still belong to the patent coverage protection scope of the utility model.It should be noted that, in order to clearly express, the description of the utility model is omitted in the description of the utility model, and the components and processing known to those skilled in the art which are not directly and obviously related to the protection scope of the utility model are omitted.

Claims

1. A signal-pumped combiner with end-pump and side-pump combination, characterized by, The application relates to a signal fiber and a plurality of pump fibers, the plurality of pump fibers are coupled into one pump fiber to form a coupling pump fiber by a fusion taper method, and the coupling pump fiber is fused into the signal fiber by side pumping.

2. The end-pumped side-pumped combined signal-pumped combiner of claim 1, wherein, The coupling pump fiber fused into the signal fiber by side pumping is at least two.

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