CN201417321Y

CN201417321Y - Doubly clad optical fiber side pump combiner

Info

Publication number: CN201417321Y
Application number: CN2009201325787U
Authority: CN
Inventors: 朱学文; 董杰
Original assignee: SHENZHEN LIGHTCOMM TECHNOLOGY Co Ltd
Current assignee: SHENZHEN LIGHTCOMM TECHNOLOGY Co Ltd
Priority date: 2009-06-05
Filing date: 2009-06-05
Publication date: 2010-03-03
Anticipated expiration: 2019-06-05

Abstract

The utility model discloses a doubly clad optical fiber side pump combiner, which includes a doubly clad optical fiber (10) and at least one pump input optical fiber (18). The cross section of an inner clad layer (141) at the joint area (26) of the doubly clad optical fiber (10) and the pump input optical fiber (18) is a polygon, the tail end of the joint area of the pump input optical fiber (18)and the inner clad layer (141) takes the shape of a sharp wedge, and the doubly clad optical fiber (10) and the pump input optical fiber (18) are jointed together in the manner of index-matching glueor flame sintering. The manufacture thereof is simple, combiners of various specifications can be manufactured, the joint thereof doesn't damage the fiber core of the doubly clad optical fiber, the good reverse isolation performance is provided, and the loss of signals is reduced.

Description

Doubly clad optical fiber profile pump bundling device

Technical field

The utility model relates to the pumped fiber bundling device, relates in particular to a kind of doubly clad optical fiber profile pump bundling device that is applied to fiber laser or fiber amplifier.

Background technology

The cladding pumping coupling technique of fiber laser has immeasurable effect to decision fiber laser performance and level.The pumped fiber coupled apparatus that is used for high-power full-optical-fiber laser uses under very high power condition, and its coupling efficiency must be very high, and loss must be very little, and the power that bears must be very big, and the way of input light also needs many as much as possible.Under so numerous maximum conditions required, the pumping coupler spare of making high-quality had very high difficulty, and but, the methods of realization are also varied, and this is a challenging technology.Development trend from high power fiber laser, also require pumping coupler spare when pump light is coupled to inner cladding, do not influence and damage as far as possible the fibre core of doubly clad optical fiber, because only in this way could under the situation of generation that does not influence signal laser and transmission, realize the cascade pumping, realize the output of super high power.

Existing profile pump technology, as number of patent application be: 03141900.3 double-clad optical fiber laser side coupling pump pump apparatus, the optical cement unification is coated with the V-arrangement prism of highly reflecting films in the V-shaped groove that inner cladding, surrounding layer and the overlay of doubly clad optical fiber are offered, pump light focuses on the inner cladding of coupled into double-clad fiber on the plated film face of V-arrangement prism through lens combination, and transmit by inner cladding, can be embedded the identical device coupling multi beam pump light of a plurality of structures at a plurality of positions of doubly clad optical fiber, this method for making technological requirement height, and less stable.

Therefore, the profile pump bundling device how manufacture craft is simple and pumping efficiency is high is a technical matters that needs to be resolved hurrily in the industry.

The utility model content

Technical problem to be solved in the utility model is: a kind of make simple and the high doubly clad optical fiber profile pump bundling device of pumping coupling efficiency are provided.

For solveing the technical problem, the technical scheme that the utility model provides is: a kind of doubly clad optical fiber profile pump bundling device, comprise doubly clad optical fiber, at least one pumping input optical fibre, wherein: the xsect of the inner cladding at described doubly clad optical fiber and place, pumping input optical fibre land is a polygon, described pumping input optical fibre becomes glut shape with the end at the faying face place of inner cladding, and described doubly clad optical fiber and pumping input optical fibre combine with the mode of refractive index match glue or flame sintering.

The inner cladding of described doubly clad optical fiber can be provided with the faying face that matches with the pumping input optical fibre of different size at different parts, the faying face attrition process of doubly clad optical fiber and pumping input optical fibre.

In an embodiment of the present utility model, the xsect of the inner cladding of described land is positive triangle and combines with three pumping input optical fibres, thereby is made into (3+1) * 1 profile pump bundling device product, and good reverse isolation performance is provided.

In other embodiments of the present utility model, the xsect of the inner cladding of described land can combine for N limit shape and with N bar pumping input optical fibre, is made into (N+1) * 1 bundling device product.

Compared with prior art, manufacture craft of the present utility model is simple, the xsect of the inner cladding of the land of doubly clad optical fiber and pumping input optical fibre is the bundling device that polygon can be made plurality of specifications, doubly clad optical fiber does not destroy the fibre core of doubly clad optical fiber with combining of pumping input optical fibre, and good reverse isolation performance is provided and reduces loss of signal.

Description of drawings

Below in conjunction with drawings and Examples the utility model is made detailed explanation, wherein:

Fig. 1 is the structural representation of the utility model doubly clad optical fiber profile pump bundling device;

Fig. 2 is a middle A-A cross sectional representation embodiment illustrated in fig. 1;

Fig. 3 is the cross sectional representation of junction among another embodiment.

Embodiment

Fig. 1 shows structural representation of the present utility model, doubly clad optical fiber 10 is a polygon with the xsect of the inner cladding 141 at place, pumping input optical fibre 18 lands 26, described pumping input optical fibre 18 becomes glut shape with the end at the faying face place of inner cladding 141, and the mode of described doubly clad optical fiber 10 and pumping input optical fibre 18 usefulness refractive index match glue or flame sintering combines.

Fig. 2 be among Fig. 1 along the cross sectional representation of A-A line, doubly clad optical fiber 10 is positive triangle with the xsect of the inner cladding 141 of the land 26 of pumping input optical fibre 18.The inner cladding of doubly clad optical fiber 10 (20/400-GDF) is 400um, core diameter is 20um, pumping input optical fibre 18 (200/2200.22NA) fibre core is 200um, covering 220um, radially grind to form positive three limit bodies along the doubly clad optical fiber inner cladding, length is L, three pumping input optical fibre ends are ground to form glut shape, be about L at the bottom of the wedge, then with the glut of pumping optical fiber folding by penetrating rate coupling glue or being combined in doubly clad optical fiber inner cladding grinding place 28 with the mode and the doubly clad optical fiber of flame sintering, promptly be made into (3+1) * 1 optical-fiber bundling device.During work, pump light is coupled into the inner cladding 14 of doubly clad optical fiber gradually by grinding place in the pumping input optical fibre 18, and finally passes through the inner cladding transmission of doubly clad optical fiber 10, and test result: coupling efficiency is average more than 93%, below the signal Insertion Loss 0.1dB.

Fig. 3 is the cross sectional representation of another embodiment junction, and doubly clad optical fiber 10 is a regular hexagon with the xsect of the inner cladding 141 of the land 26 of pumping input optical fibre 18.Doubly clad optical fiber 10 and pumping input optical fibre 18 are selected for use with example one described material, radially grind to form hexahedron along the doubly clad optical fiber inner cladding, length is L, six roots of sensation pumping input optical fibre end is ground to form glut shape, be about L at the bottom of the wedge, then with the glut of pumping optical fiber folding by penetrating rate coupling glue or being combined in doubly clad optical fiber inner cladding grinding place 28 with the mode and the doubly clad optical fiber of flame sintering, promptly be made into (6+1) * 1 optical-fiber bundling device.Working method is described as example one, test result: coupling efficiency is average more than 93%, below the signal Insertion Loss 0.1dB.

The utility model can be combined with doubly clad optical fiber 10 from the side by N root pumping input optical fibre 18, makes (N+1) * 1 optical-fiber bundling device.

The faying face that matches with the pumping input optical fibre 18 of different size can also be set on the different parts of the inner cladding 14 of doubly clad optical fiber 10, insert any root pumping input optical fibre at the inner cladding diverse location of doubly clad optical fiber 10 according to user's needs.

The utility model utilizes grinding technics, with the pump light inner cladding of coupled into double-clad fiber from the side, does not damage the fibre core of double clad, advantage such as have that technology is simple, good stability, yield rate height, reverse isolation performance are good.

Abovely the utility model is specifically described, but those skilled in the art can make numerous variations or variation to these embodiments these changes and changing within the scope that should fall into the utility model protection in conjunction with better embodiment.

Claims

1, a kind of doubly clad optical fiber profile pump bundling device, comprise doubly clad optical fiber (10), at least one pumping input optical fibre (18), it is characterized in that: described doubly clad optical fiber (10) is a polygon with the xsect of the inner cladding (141) of pumping input optical fibre (18) land (26), described pumping input optical fibre (18) becomes glut shape with the end at the faying face place of inner cladding (141), and described doubly clad optical fiber (10) and pumping input optical fibre (18) combine with the mode of refractive index match glue or flame sintering.

2, doubly clad optical fiber profile pump bundling device according to claim 1 is characterized in that: the inner cladding of described doubly clad optical fiber (10) is provided with the faying face that matches with the pumping input optical fibre (18) of different size at different parts.

3, doubly clad optical fiber profile pump bundling device according to claim 1 is characterized in that: the faying face attrition process of described doubly clad optical fiber (10) and pumping input optical fibre (18).

4, doubly clad optical fiber profile pump bundling device according to claim 1 is characterized in that: the xsect of the inner cladding (141) of described land (26) is positive triangle and combines with three pumping input optical fibres (18).

5, doubly clad optical fiber profile pump bundling device according to claim 1 is characterized in that: the xsect of the inner cladding (141) of described land (26) is regular hexagon and combines with six pumping input optical fibres (18).