CN211180288U

CN211180288U - Linear polarization full polarization-maintaining mode-locked optical fiber wavelength division multiplexing device

Info

Publication number: CN211180288U
Application number: CN201922098820.XU
Authority: CN
Inventors: 苏庆超; 郑权; 王禹凝; 宋国龙; 王丽鑫; 赵岭
Original assignee: Changchun New Industries Optoelectronics Tech Co ltd
Current assignee: Changchun New Industries Optoelectronics Tech Co ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-08-04
Anticipated expiration: 2029-11-29

Abstract

The utility model discloses a linear polarization full polarization-maintaining mode-locked optical fiber wavelength division multiplexing device, which comprises a connecting pipe, the connecting pipe is of a hollow structure, a cavity is arranged in the middle of the connecting pipe, a first glass round pipe and a second glass round pipe are respectively arranged at two ends of the cavity, the second glass round tube is internally connected with a positive lens in a penetrating way, the right end of the second glass round tube is connected with a double-fiber capillary tube, a second polarization maintaining optical fiber and a third polarization maintaining optical fiber are arranged on the right side of the double-fiber capillary tube and penetrate into the double-fiber capillary tube, a filter plate, a dichroic polaroid and a Wollaston prism are sequentially arranged between the self-focusing filter and the positive lens, the high-integration optical fiber wavelength division multiplexer reduces the complexity of the laser system, meanwhile, the stability of the system is improved, the linear polarization laser oscillation and transmission of the laser system are guaranteed, and the system is equivalent to the laser system with reduced cost, simple assembly and better performance.

Description

Linear polarization full polarization-maintaining mode-locked optical fiber wavelength division multiplexing device

Technical Field

The utility model relates to an optic fibre wavelength division multiplexer technical field in the fiber laser, especially a polarization maintaining mode locking optic fibre wavelength division multiplexing device.

Background

At present, in a laser system, the optical fiber wavelength division multiplexing technology is an important means for coupling pump light and signal light into a cavity, and the wavelength division multiplexing technology is mature and stable in the market. However, there are many other devices with other functions in the laser system, such as linear polarization function, coupling splitting function, filtering function, etc., and the devices with these functions increase the complexity of the whole laser system and daily production, and greatly affect the stability and reliability of the laser system.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve prior art's not enough, provide a full polarization-maintaining mode locking optic fibre wavelength division multiplexing device of linear polarization.

In order to realize the purpose, the following technical scheme is provided:

a linear polarization full polarization-maintaining mode-locked optical fiber wavelength division multiplexing device comprises a connecting pipe, wherein the connecting pipe is of a hollow structure, a cavity channel is arranged in the middle of the connecting pipe, a first glass circular pipe and a second glass circular pipe are respectively installed at two ends of the cavity channel, a self-focusing filter is connected in a penetrating manner with the first glass circular pipe, a multi-optical fiber collimator is installed at the left end of the self-focusing filter, a structural optical fiber is installed at the left end of the self-focusing filter, a first polarization-maintaining optical fiber and a multi-mode optical fiber are welded at the left end of the structural optical fiber, a positive lens is connected in a penetrating manner with the second glass circular pipe, a double-fiber capillary tube is connected at the right end of the self-focusing filter, a second polarization-maintaining optical fiber and a third polarization-maintaining optical fiber are arranged on the right side of the double-fiber capillary tube and penetrate into the double-fiber capillary tube, a filter plate, a, the Wollaston prism is close to the positive lens, the fast axes or the slow axes of the second polarization maintaining optical fiber and the third polarization maintaining optical fiber are mutually vertical, and the end surfaces of the second polarization maintaining optical fiber and the third polarization maintaining optical fiber are positioned on the back focal plane of the positive lens.

Preferably, the multimode optical fiber, the first polarization maintaining optical fiber, the second polarization maintaining optical fiber and the third polarization maintaining optical fiber comprise a ground and polished end face and are coated with an antireflection film.

Preferably, the polarization direction of the dichroic polarizer is parallel to the slow or fast axis of the first polarizing maintaining fiber.

Preferably, the wollaston prism is composed of two uniaxial birefringent crystal wedges with optical axes perpendicular to each other and optical axes perpendicular to or close to perpendicular to the incident light direction, the wollaston prism divides a beam of vertically incident light into two beams of polarized light with polarization planes orthogonal to each other, the included angle between the optical axes of the two beams of polarized light is c, a is b × c, a is the fiber core distance between the second polarization maintaining optical fiber and the third polarization maintaining optical fiber, b is the effective focal length of the positive lens, and the unit of c is radian.

The utility model has the advantages that: the wavelength division multiplexer of this application has more 2 functions than traditional optic fibre wavelength division multiplexer, except that the optical coupling with different wavelength advances optical fiber system, the function and the laser polarizing function of coupling light detection of outputting have still been increased, this makes this multi-functional wavelength division multiplexer of linear polarization have very big advantage in the laser instrument field, this kind of high integrated level's optic fibre wavelength division multiplexer has reduced laser system's complexity, the stability of system has been improved simultaneously, laser system's linear polarization laser oscillation and transmission have been guaranteed, the cost that is equivalent to laser system reduces, the assembly is simple, the performance is more excellent.

Drawings

Fig. 1 is a schematic view of an internal structure of a wavelength division multiplexing device according to the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The wavelength division multiplexing device for the linearly polarized and fully polarization-maintaining mode-locked optical fiber comprises a connecting pipe 12, wherein the connecting pipe 12 is of a hollow structure, a cavity 11 is arranged in the middle of the connecting pipe 12, a first glass circular pipe 6 and a second glass circular pipe 9 are respectively arranged at two ends of the cavity 11, a self-focusing filter 7 is connected to the first glass circular pipe 6 in a penetrating manner, a multi-fiber collimator 13 is arranged at the left end of the self-focusing filter 7, a structural optical fiber 5 is arranged at the left end of the self-focusing filter 7, a first polarization maintaining optical fiber 1 and a multi-mode optical fiber 14 are welded at the left end of the structural optical fiber 5, a positive lens 2 is connected to the second glass circular pipe 9 in a penetrating manner, a double-fiber capillary 3 is connected to the right end of the second glass circular pipe, a second polarization maintaining optical fiber 4 and a third polarization maintaining optical fiber 15 are arranged on the right side of the double-fiber capillary 3 and penetrate through the double-fiber capillary, and, The polarization maintaining optical fiber comprises a dichroic polarizer 16 and a Wollaston prism 10, wherein the filter 8 is close to a self-focusing filter 7, the Wollaston prism 10 is close to a positive lens 2, the fast axis or the slow axis of a second polarization maintaining optical fiber 4 and a third polarization maintaining optical fiber 15 are mutually vertical, and the end surfaces of the second polarization maintaining optical fiber 4 and the third polarization maintaining optical fiber 15 are positioned on the back focal plane of the positive lens 2.

The multimode optical fiber 14, the first polarization maintaining optical fiber 1, the second polarization maintaining optical fiber 4 and the third polarization maintaining optical fiber 15 comprise a ground and polished end face and are coated with antireflection films.

Wherein the polarization direction of said dichroic polarizer 16 is parallel to the slow or fast axis of the first polarizing-maintaining fiber 1.

The Wollaston prism 10 is composed of two uniaxial birefringent crystal wedges of which optical axes are perpendicular to each other and of which optical axes are perpendicular to or close to perpendicular to the incident light direction, the Wollaston prism 10 divides a beam of vertically incident light into two beams of polarized light of which the polarization surfaces are orthogonal to each other, the included angle of the optical axes of the two beams of polarized light is c, a is b × c, a is the fiber core distance of the second polarization maintaining optical fiber and the third polarization maintaining optical fiber, b is the effective focal length of the positive lens, and the unit of c is radian.

According to malus law, when the direction of polarization of the dichroic polarizer 16 makes an angle a with the optical axis of the first wedge of the wollaston prism 10, the light split by the wollaston prism 10 will be split into two mutually orthogonal, power-complementary linear polarizations: cos ^2(a) and sin ^2(a), the sum of which is cos ^2(a) + sin ^2(a) ═ 1; the wavelength division multiplexer can realize the light splitting function of any specified light splitting ratio from 0.001: 0.999 to 0.999: 0.001.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The linear polarization-maintaining mode-locked fiber wavelength division multiplexing device is characterized by comprising a connecting pipe, wherein the connecting pipe is of a hollow structure, a cavity channel is arranged in the middle of the connecting pipe, a first glass circular pipe and a second glass circular pipe are respectively arranged at two ends of the cavity channel, a self-focusing filter is connected to the first glass circular pipe in a penetrating manner, a multi-fiber collimator is arranged at the left end of the self-focusing filter, structural optical fibers are arranged at the left end of the self-focusing filter, a first polarization-maintaining optical fiber and a multimode optical fiber are welded at the left end of the structural optical fibers, a positive lens is connected to the second glass circular pipe in a penetrating manner, a double-fiber capillary tube is connected to the right end of the self-focusing filter, a second polarization-maintaining optical fiber and a third polarization-maintaining optical fiber are arranged on the right side of the double-fiber capillary tube and penetrate into the double-fiber capillary tube, a filter plate, a, the filter plate is close to the self-focusing filter, the Wollaston prism is close to the positive lens, the fast axes or the slow axes of the second polarization maintaining optical fiber and the third polarization maintaining optical fiber are mutually vertical, and the end surfaces of the second polarization maintaining optical fiber and the third polarization maintaining optical fiber are positioned on the back focal plane of the positive lens.

2. The device according to claim 1, wherein the multimode fiber, the first polarization maintaining fiber, the second polarization maintaining fiber and the third polarization maintaining fiber comprise a polished end surface and are coated with an antireflection film.

3. The device according to claim 1, wherein the dichroic polarizer has a polarization direction parallel to the slow axis or the fast axis of the first polarization maintaining fiber.

4. The device according to claim 1, wherein the Wollaston prism comprises two uniaxial birefringent crystal wedges with optical axes perpendicular to each other and with optical axes perpendicular to or close to perpendicular to the incident light direction, the Wollaston prism divides a beam of vertically incident light into two beams of polarized light with polarization planes orthogonal to each other, the included angle between the optical axes of the two beams of polarized light is c, a is b × c, a is the core distance between the second polarization maintaining fiber and the third polarization maintaining fiber, b is the effective focal length of the positive lens, and c is radian.