Optical fiber collimator

Abstract

The utility model discloses an optical fiber collimator which comprises a lens, an optical fiber piece, a first glass tube and a second glass tube, the lens and the second glass tube are arranged in the first glass tube at intervals along the axial direction, the optical fiber piece is arranged in the second glass tube along the axial direction, the lens is made of N-SF11 materials, and the optical fiber piece is made of N-SF11 materials. The two end faces, close to each other, of the lens and the optical fiber piece are a 5-degree inclined face and a 8-degree inclined face respectively. According to the utility model, the center offset of the light beam in the lens transmission process is small, and better light spots can be formed.

Description

Technical Field

[0001] The utility model relates to the technical field of fiber collimators, and particularly to a fiber collimator. Background Art

[0002] Currently, a conventional collimator includes a lens, an optical fiber, a coreless optical fiber, a first glass tube, and a second glass tube. The lens and the second glass tube are axially spaced in the first glass tube. The optical fiber and the coreless optical fiber are arranged in the second glass tube. The light output by the optical fiber passes through the coreless optical fiber and then is output to the lens, and finally is collimated and output to free space. Among them, in order to ensure that the return loss is greater than 50 dB, the angles of the two faces of the second glass tube opposite to the lens are both 8°.

[0003] However, since refraction occurs when light is transmitted non-normally between different media, and the refraction angle is related to the refractive index of the medium, different end face angles should be selected when transmitting between different media. Otherwise, the light beam cannot be transmitted along the axis, resulting in deterioration of the output light coaxiality, and the output light cannot be output through the center of the lens, generating aberration and causing deterioration of the light spot. For example, when the lens material is N-SF11 and the angles of the lens and the optical fiber end face are both 8°, the central offset during the light beam transmission will be relatively large. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a fiber collimator to obtain a better light spot.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A fiber collimator includes a lens, an optical fiber component, a first glass tube, and a second glass tube. The lens and the second glass tube are axially spaced in the first glass tube. The optical fiber component is axially arranged in the second glass tube. The lens is made of N-SF11 material. The two end faces of the lens and the optical fiber component close to each other are 5° inclined planes and 8° inclined planes respectively.

[0007] Preferably, it further includes a third glass tube. The third glass tube is arranged in the first glass tube, and the second glass tube is arranged in the third glass tube.

[0008] Preferably, one end of the second glass tube close to the lens extends out of one end of the third glass tube close to the lens.

[0009] Preferably, the second glass tube and the third glass tube are connected and fixed by an adhesive.

[0010] Preferably, the third glass tube and the first glass tube are connected and fixed by the adhesive.

[0011] Preferably, the lens and the first glass tube are fixedly connected by an adhesive.

[0012] Preferably, the adhesive is epoxy resin glue.

[0013] Preferably, the optical fiber component includes an optical fiber and a coreless optical fiber. The optical fiber and the coreless optical fiber are axially arranged in the second glass tube, and the coreless optical fiber is arranged at one end of the optical fiber close to the lens. The end face of the coreless optical fiber close to the lens is an 8° inclined plane, and the optical fiber and the coreless optical fiber are fusion spliced together.

[0014] Compared with the prior art, the optical fiber collimator according to an embodiment of the present invention has the following beneficial effects:

[0015] In the present invention, since the lens is made of N-SF11 material, when the two end faces of the lens and the second glass tube close to each other are both 8° inclined planes, the center of the light beam will deviate too much during transmission, resulting in spot degradation. Therefore, in the optical fiber collimator of the present invention, the two end faces of the lens and the second glass tube close to each other are 5° inclined plane and 8° inclined plane respectively, so that the lens can make the center deviation of the light beam during transmission smaller, and a better spot can be obtained. Description of the Drawings

[0016] Figure 1 is a perspective view of an embodiment of the present invention;

[0017] Figure 2 is a cross-sectional view of an embodiment of the present invention;

[0018] Figure 3 is a schematic diagram of the offset of the light beam in the prior art within the lens;

[0019] Figure 4 is a schematic diagram of the offset of the light beam of the present invention within the lens.

[0020] In the figure, 1, lens; 2, optical fiber; 3, coreless optical fiber; 4, first glass tube; 5, second glass tube; 6, third glass tube. Detailed Embodiments

[0021] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0022] In the description of the present utility model, it should be understood that the term "comprising" used in the specification of the present utility model means the presence of the described features, integers, steps, operations, components and / or assemblies, but does not exclude the presence or addition of one or more other features, integers, steps, operations, components, assemblies and / or groups thereof. It should be understood that when we say that a component is "connected" to another component, it can be directly connected to other components, or there can also be intermediate components. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0023] As Figure 1 and Figure 2 shown, the present utility model relates to an optical fiber collimator, which includes a lens 1, an optical fiber component, a first glass tube 4 and a second glass tube 5. The lens 1 and the second glass tube 5 are axially spaced in the first glass tube 4. The optical fiber component is axially arranged in the second glass tube 5. The lens 1 is made of N-SF11 material. The two end faces of the lens 1 and the optical fiber component close to each other are inclined planes of 5° and 8° respectively.

[0024] In the present utility model, since the lens 1 is made of N-SF11 material, when the two end faces of the lens 1 and the optical fiber component close to each other are both inclined planes of 8°, the lens 1 will cause the center offset of the light beam during transmission to be too large, resulting in spot deterioration. Therefore, in the optical fiber collimator of the present utility model, the two end faces of the lens 1 and the optical fiber component close to each other are inclined planes of 5° and 8° respectively, so that the lens 1 can make the center offset of the light beam during transmission smaller, in order to obtain a better spot.

[0025] In this embodiment, the optical fiber component and the second glass tube 5 are processed together. The optical fiber component is located in the second glass tube 5. When processing the inclined plane, the second glass tube 5 and the optical fiber component are cut together to form the inclined plane. Therefore, the end face of the optical fiber component close to the lens 1 is flush with the end face of the second glass tube 5 close to the lens 1.

[0026] In this embodiment, the optical fiber collimator further includes a third glass tube 6. The third glass tube 6 is arranged in the first glass tube 4, and the second glass tube 5 is arranged in the third glass tube 6 for easy installation.

[0027] Preferably, one end of the second glass tube 5 close to the lens 1 extends out from one end of the third glass tube 6 close to the lens 1, so that the optical fiber component in the second glass tube 5 is close to the lens 1.

[0028] In this embodiment, the second glass tube 5 and the third glass tube 6 are fixedly connected by an adhesive to ensure the stability of the connection between the second glass tube 5 and the third glass tube 6.

[0029] Preferably, the third glass tube 6 and the first glass tube 4 are fixedly connected by the adhesive to ensure the stability of the connection between the first glass tube 4 and the third glass tube 6.

[0030] In this embodiment, the lens 1 and the first glass tube 4 are fixedly connected by an adhesive to ensure the stability of the connection between the lens 1 and the first glass tube 4.

[0031] In this embodiment, the adhesive is epoxy resin glue, thereby ensuring the stability of the connection of each component of the fiber collimator to ensure the stability of the overall structure and making the assembly more convenient.

[0032] In this embodiment, the optical fiber component includes an optical fiber 2 and a coreless optical fiber 3. The optical fiber 2 and the coreless optical fiber 3 are axially arranged in the second glass tube 5, and the coreless optical fiber 3 is arranged at one end of the optical fiber 2 close to the lens 1. The end face of the coreless optical fiber 3 close to the lens 1 is an 8° inclined plane. The optical fiber 2 and the coreless optical fiber 3 are fusion spliced together to make the optical fiber 2 and the coreless optical fiber 3 stable together.

[0033] As Figure 3 shown, when the two end faces of the lens 1 and the second glass tube 5 close to each other are both 8° inclined planes, the central offset of the light beam during the transmission in the lens 1.

[0034] As Figure 4 shown, when the two end faces of the lens 1 and the second glass tube 5 close to each other are an inclined plane of 5° and an inclined plane of 8° respectively, the central offset of the light beam during the transmission in the lens 1.

[0035] In summary, compared with the prior art, the fiber collimator of the present invention is more convenient to assemble, and the central offset of the light beam during the transmission in the lens is smaller, so as to form a better light spot.

[0036] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A fiber collimator, characterized in that: It includes a lens, an optical fiber component, a first glass tube and a second glass tube. The lens and the second glass tube are axially spaced in the first glass tube. The optical fiber component is axially arranged in the second glass tube. The lens is made of N-SF11 material. The two end faces of the lens and the optical fiber component close to each other are 5° and 8° bevels respectively.

2. The optical fiber collimator according to claim 1, characterized in that: It also includes a third glass tube, which is arranged in the first glass tube, and the second glass tube is arranged in the third glass tube.

3. The optical fiber collimator according to claim 2, characterized in that: One end of the second glass tube close to the lens extends out from one end of the third glass tube close to the lens.

4. The optical fiber collimator according to claim 2, characterized in that: The second glass tube and the third glass tube are connected and fixed by an adhesive.

5. The optical fiber collimator according to claim 4, characterized in that: The third glass tube is connected and fixed to the first glass tube by the adhesive.

6. The optical fiber collimator according to claim 1, characterized in that: The lens is connected and fixed to the first glass tube by an adhesive.

7. The optical fiber collimator according to claim 6, characterized in that: The adhesive is epoxy resin glue.

8. The optical fiber collimator according to claim 1, characterized in that: The optical fiber component includes an optical fiber and a coreless optical fiber, the optical fiber and the coreless optical fiber are axially arranged in the second glass tube, and the coreless optical fiber is arranged at one end of the optical fiber close to the lens, the end face of the coreless optical fiber close to the lens is an inclined surface of 8°, and the optical fiber and the coreless optical fiber are fused together.

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