CN112925065A - Optical fiber space filter - Google Patents

Optical fiber space filter Download PDF

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Publication number
CN112925065A
CN112925065A CN201911234462.9A CN201911234462A CN112925065A CN 112925065 A CN112925065 A CN 112925065A CN 201911234462 A CN201911234462 A CN 201911234462A CN 112925065 A CN112925065 A CN 112925065A
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Prior art keywords
optical fiber
fiber
face
spatial filter
central channel
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CN112925065B (en
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虞天成
俞浩
王俊
潘华东
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Suzhou Everbright Photonics Co Ltd
Suzhou Everbright Semiconductor Laser Innovation Research Institute Co Ltd
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Suzhou Everbright Photonics Co Ltd
Suzhou Everbright Semiconductor Laser Innovation Research Institute Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
    • G02B6/3632—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means
    • G02B6/3636—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means the mechanical coupling means being grooves
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

The invention discloses an optical fiber space filter, which comprises: the optical fiber ferrule is provided with a first end surface and an inner surface used for limiting the inner central channel, the first end surface is connected with the inner surface, and a truncated cone-shaped groove is formed by encircling along one end connected with the inner surface; the central channel of the optical fiber insertion core is used for accommodating an optical fiber. According to the optical fiber space filter provided by the embodiment of the invention, the optical fiber is arranged in the channel of the optical fiber ferrule by arranging the optical fiber ferrule, so that light beams which do not meet the optical fiber coupling condition can be prevented from entering the optical fiber, and the reliability of the optical fiber is improved. Meanwhile, one end, connected with the inner surface, of the first end face of the optical fiber ferrule is surrounded into a truncated cone-shaped groove, and one end, used for receiving incident light, of the optical fiber can be directly arranged at the joint of the first end face of the optical fiber ferrule and the inner surface when the optical fiber is installed, so that alignment of the optical fiber is facilitated. In addition, the round table-shaped groove can filter stray light which does not meet optical fiber coupling conditions, and the stability of the optical fiber coupling system in long-term work is ensured.

Description

Optical fiber space filter
Technical Field
The invention relates to the technical field of optical fiber coupling, in particular to an optical fiber spatial filter.
Background
The optical fiber has the characteristics of flexible light beam transmission, light beam homogenization and the like, and is widely applied to the fields of industry, scientific research, military and the like. Optical fibers typically have a small core diameter and have tight numerical aperture limits due to the different refractive indices of the fiber cladding and core. Therefore, when the light beam is transmitted in the free space and focused and coupled into the optical fiber, it is very likely that stray light with a larger numerical aperture is generated due to an oversize incident spot size, or high-order aberration introduced by an optical device, or diffraction generated by light blocking, or the focused spot size is larger than the fiber core size of the optical fiber. These cause the light beam coupled into the fiber to propagate along the cladding, raising the temperature of the fiber, and eventually causing the fiber and even the rear optical system to suffer irreversible loss.
In order to solve the above problems in the prior art, a diaphragm is added to the optical path to filter out a part of the light beam that does not satisfy the fiber coupling condition. However, in actual mass production, the adjustment of the diaphragm increases the pressure of the production line and reduces the reliability of the laser system.
Disclosure of Invention
In view of this, an embodiment of the present invention provides an optical fiber spatial filter to solve the technical problem that a method for filtering a light beam that does not satisfy an optical fiber coupling condition by setting a diaphragm in the prior art increases the pressure of a production line and is not suitable for mass production.
The technical scheme provided by the invention is as follows:
an embodiment of the present invention provides an optical fiber spatial filter, including: the optical fiber ferrule is provided with a first end surface and an inner surface used for limiting an inner central channel, wherein the first end surface is connected with the inner surface, and a truncated cone-shaped groove is formed by encircling one end connected with the inner surface; the central channel of the optical fiber inserting core is used for accommodating an optical fiber.
Optionally, a distance between an end of the first end surface, which is connected with the inner surface, and the axis of the central channel is smaller than a distance between an end of the first end surface, which is far away from the inner surface, and the axis of the central channel.
Optionally, the fiber stub further comprises: and the front end face is used for blocking stray light and is vertical to the central channel.
Optionally, the fiber stub further comprises: the front end face is used for blocking stray light, is not perpendicular to the central channel, and inclines along the incidence direction of the light beam.
Optionally, the fiber optic spatial filter further comprises: and the focusing lens is arranged in front of the optical fiber ferrule and used for focusing the light beam emitted to the optical fiber ferrule.
Optionally, the range of the included angle between the generatrix of the circular truncated cone-shaped groove and the axis of the central channel is expressed by the following formula:
when alpha is0≤NA，α0≤αin≤NA；
When alpha is0≥NA，αin≤NA；
Wherein alpha isinAn included angle between a generatrix of the circular truncated cone-shaped groove and an axis of the central channel is shown,
Figure BDA0002304504620000021
NA represents a numerical aperture of the optical fiber, D represents a caliber of a light beam incident to the focusing lens, f represents a focal length of the focusing lens, t represents a cladding thickness of the optical fiber, and L represents a horizontal distance between an incident end face of the optical fiber and the front end face.
Optionally, the radius of the incident hole of the optical fiber ferrule is expressed by the following formula:
rout＝Ltan(αin)+rfiber+t
wherein r isfiberRepresenting the core radius of the optical fiber.
Optionally, the material of the optical fiber ferrule is ceramic or metal.
Optionally, the front face of the fiber stub is coated with a reflective material.
Optionally, the reflective material is any one of a metal material, a ceramic material, or a dielectric material.
The technical scheme of the invention has the following advantages:
according to the optical fiber space filter provided by the embodiment of the invention, the optical fiber is arranged in the channel of the optical fiber ferrule by arranging the optical fiber ferrule, so that light beams which do not meet the optical fiber coupling condition can be prevented from entering the optical fiber, and the reliability of the optical fiber is improved. Meanwhile, one end, connected with the inner surface, of the first end face of the optical fiber ferrule is surrounded into a truncated cone-shaped groove, and one end, used for receiving incident light, of the optical fiber can be directly arranged at the joint of the first end face of the optical fiber ferrule and the inner surface when the optical fiber is installed, so that alignment of the optical fiber is facilitated. In addition, the circular truncated cone-shaped groove can enable more externally-incident light beams to enter the fiber core of the optical fiber, so that the coupling efficiency of the light beams coupled to the optical fiber is improved.
The optical fiber spatial filter provided by the embodiment of the invention can effectively reflect or absorb stray light which does not meet the optical fiber coupling condition, prevent light beams from being incident to a cladding or being transmitted in the cladding, and ensure the safety and stability of the optical fiber and a subsequent laser system thereof. Meanwhile, the optical fiber space filter can also be used as an alignment standard in the optical fiber coupling process, so that the reliability of the whole system is improved. In addition, the optical fiber space filter provided by the embodiment of the invention is simple to manufacture, convenient to install and adjust and capable of being widely applied to the field of high-power optical fibers.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of an optical fiber spatial filter according to an embodiment of the present invention;
FIG. 2 is a block diagram of an alternative fiber optic spatial filter according to the present invention;
fig. 3 is a block diagram of a fiber optic spatial filter according to another embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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 the description of the present invention, it should be noted that, 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; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
An embodiment of the present invention provides an optical fiber spatial filter, as shown in fig. 1, the optical fiber spatial filter includes: the optical fiber ferrule 1 is provided with a first end surface 11 and an inner surface 12 for limiting an inner central channel, wherein the first end surface 11 is connected with the inner surface 12, and a truncated cone-shaped groove 13 is surrounded at one end of the first end surface 11 connected with the inner surface 12; the central channel of the optical fiber ferrule 1 is used for accommodating the optical fiber 2. The optical fiber 2 includes an optical fiber cladding 21 and an optical fiber core 22.
Specifically, as shown in fig. 1, the truncated cone-shaped groove 13 may be configured such that a distance between an end of the first end surface 11 contacting the inner surface 12 and the axis of the central passage is smaller than a distance between an end of the first end surface 11 far from the inner surface and the axis of the central passage, that is, a larger bottom surface of upper and lower bottom surfaces of the truncated cone-shaped groove 13 is an end surface far from the optical fiber, and the smaller bottom surface overlaps with an incident end surface of the optical fiber.
According to the optical fiber space filter provided by the embodiment of the invention, the optical fiber is arranged in the channel of the optical fiber ferrule by arranging the optical fiber ferrule, so that light beams which do not meet the optical fiber coupling condition can be prevented from entering the optical fiber, and the reliability of the optical fiber is improved. Meanwhile, one end, connected with the inner surface, of the first end face of the optical fiber ferrule is surrounded into a truncated cone-shaped groove, and one end, used for receiving incident light, of the optical fiber can be directly arranged at the joint of the first end face of the optical fiber ferrule and the inner surface when the optical fiber is installed, so that alignment of the optical fiber is facilitated. In addition, the circular truncated cone-shaped groove can enable more externally-incident light beams to enter the fiber core of the optical fiber, so that the coupling efficiency of the light beams coupled to the optical fiber is improved.
As an optional implementation manner of the embodiment of the present invention, as shown in fig. 2, the optical fiber ferrule further includes: a front end face 14 for blocking stray light, the front end face 14 being perpendicular to the central passage. Specifically, of externally incident light beams, light beams that satisfy the fiber coupling condition may enter the optical fiber 2, and light beams that do not satisfy the condition may be blocked by the front end face 14 from entering the optical fiber 2, and these light beams that do not satisfy the condition may be referred to as stray light.
As an alternative to the embodiment of the present invention, as shown in fig. 1, the front end surface 14 for blocking the stray light may not be perpendicular to the central channel, and the front end surface 14 is inclined along the incident direction of the light beam. Thus, when stray light emitted toward the fiber stub 1 is blocked by the front end face 14, the light beam is not reflected to a device disposed in front of the fiber stub 1, the influence of the stray light on other devices is avoided, and the reliability of the overall structure is improved.
Alternatively, the material of the optical fiber ferrule 1 may be selected from ceramics or metals. The front end face 14 of the fiber stub 1 may be coated with a reflective material. The reflective material may be selected from any one of a metal material, a ceramic material, or a dielectric material. Specifically, the light beam which does not satisfy the fiber coupling condition can be reflected or absorbed by the front end face 14, and the reflection material is coated on the front end face 14, so that the absorption of the fiber stub 1 to stray light can be reduced, the temperature of the fiber stub can be reduced, the service life of the fiber stub can be prolonged, and the reliability of the fiber stub can be improved.
As an optional implementation manner of the embodiment of the present invention, as shown in fig. 3, the optical fiber ferrule may further include: and the focusing lens 3 is arranged in front of the optical fiber ferrule 1 and is used for focusing the light beam emitted to the optical fiber ferrule 1.
Optionally, in order to ensure that stray light is sufficiently absorbed by the fiber stub, an included angle α between a generatrix of the truncated cone-shaped groove and an axis of the central channel may be formedinAs small as possible, particularly by judgment
Figure BDA0002304504620000071
The size of the included angle is determined by the size of the numerical aperture of the optical fiber, so that the included angle alpha between the generatrix of the truncated cone-shaped groove and the axis of the central channelinThe range of (d) can be expressed by the following formula:
when alpha is0≤NA，α0≤αinNot more than NA; when alpha is0≥NA，αinNA is less than or equal to NA, wherein, alphainAn angle between a generatrix of the circular truncated cone-shaped groove and an axis of the central passage is shown, NA represents a numerical aperture of the optical fiber, D represents a caliber of a light beam incident to the focusing lens, f represents a focal length of the focusing lens, t represents a cladding thickness of the optical fiber, and L represents a horizontal distance between an incident end face and a front end face of the optical fiber。
Specifically, the aperture D of the light beam can be expressed in the following manner, wherein the aperture of the light beam of the circular light spot is the diameter thereof, the aperture of the light beam of the rectangular light spot is the diagonal length thereof, and the apertures of the light beams of the other polygonal light spots are the minimum circumscribed circle diameters thereof.
Optionally, the horizontal distance L between the incident end face of the optical fiber 2 and the front end face 14 does not need to be measured accurately, and it is only required to determine that the range of the included angle between the generatrix of the truncated cone-shaped groove and the axis of the central channel is within a proper range according to the above formula, so that the incident light beam cannot enter the optical fiber cladding 21. In addition, in practical applications, the horizontal distance L between the incident end face of the optical fiber and the front end face 14 can be designed to be as long as possible, because the longer horizontal distance is favorable for heat dissipation after the optical fiber ferrule 1 absorbs stray light.
Optionally, after an included angle between a generatrix of the circular truncated cone-shaped groove and an axis of the central channel is determined, the radius of the incident hole of the optical fiber ferrule 1 can be calculated by the following formula:
rout＝Ltan(αin)+rfiber+ t formula (1)
Wherein r isfiberRepresenting the core radius of the fiber.
Specifically, after calculating the radius of the incident hole of the optical fiber ferrule 1, the following formula can be used
Figure BDA0002304504620000081
Calculating to obtain the angle alpha of the maximum incident beam incident to the fiber corebeam。
The optical fiber spatial filter provided by the embodiment of the invention can effectively reflect or absorb stray light which does not meet the optical fiber coupling condition, prevent light beams from being incident to a cladding or being transmitted in the cladding, and ensure the safety and stability of the optical fiber and a subsequent laser system thereof. Meanwhile, the optical fiber space filter can also be used as an alignment standard in the optical fiber coupling process, so that the reliability of the whole system is improved. In addition, the optical fiber space filter provided by the embodiment of the invention is simple to manufacture, convenient to install and adjust and capable of being widely applied to the field of high-power optical fibers.
Although the present invention has been described in detail with respect to the exemplary embodiments and the advantages thereof, those skilled in the art will appreciate that various changes, substitutions and alterations can be made to the embodiments without departing from the spirit and scope of the invention as defined by the appended claims. For other examples, one of ordinary skill in the art will readily appreciate that the order of the process steps may be varied while maintaining the scope of the present invention.
Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.

Claims (10)

1. A fiber optic spatial filter, comprising:
the optical fiber ferrule is provided with a first end surface and an inner surface used for limiting an inner central channel, wherein the first end surface is connected with the inner surface, and a truncated cone-shaped groove is formed by encircling one end connected with the inner surface; the central channel of the optical fiber inserting core is used for accommodating an optical fiber.
2. The fiber optic spatial filter of claim 1, wherein an end of the first end face that meets the inner surface is spaced from the central channel axis by a distance that is less than a distance between an end of the first end face that is distal from the inner surface and the central channel axis.
3. The fiber optic spatial filter of claim 1, wherein the fiber stub further comprises: and the front end face is used for blocking stray light and is vertical to the central channel.
4. The fiber optic spatial filter of claim 1, wherein the fiber stub further comprises: the front end face is used for blocking stray light, is not perpendicular to the central channel, and inclines along the incidence direction of the light beam.
5. The fiber optic spatial filter of claims 3 or 4, further comprising: and the focusing lens is arranged in front of the optical fiber ferrule and used for focusing the light beam emitted to the optical fiber ferrule.
6. The fiber optic spatial filter of claim 5, wherein the extent of the included angle between the generatrix of said frustoconical recess and the axis of said central passage is expressed by the following equation:
when alpha is0≤NA，α0≤αin≤NA；
When alpha is0≥NA，αin≤NA；
Wherein alpha isinAn included angle between a generatrix of the circular truncated cone-shaped groove and an axis of the central channel is shown,
Figure FDA0002304504610000021
NA represents a numerical aperture of the optical fiber, D represents a caliber of a light beam incident to the focusing lens, f represents a focal length of the focusing lens, t represents a cladding thickness of the optical fiber, and L represents a horizontal distance between an incident end face of the optical fiber and the front end face.
7. The fiber optic spatial filter of claim 6, wherein the radius of the entrance hole of the fiber stub is expressed by the following equation:
rout＝Ltan(αin)+rfiber+t
wherein r isfiberRepresenting the core radius of the optical fiber.
8. The fiber optic spatial filter of claim 1, wherein the material of the fiber stub is ceramic or metal.
9. The fiber optic spatial filter of claims 3 or 4, wherein the front face of the fiber stub is coated with a reflective material.
10. The fiber optic spatial filter of claim 9, wherein the reflective material is any one of a metallic material, a ceramic material, or a dielectric material.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115166906A (en) * 2022-09-05 2022-10-11 度亘激光技术（苏州）有限公司 Optical module

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0792348A (en) * 1993-09-21 1995-04-07 Toshiba Corp Device for making laser beam incident on optical fiber
CN104521077A (en) * 2012-05-30 2015-04-15 Ipg光子公司 High power spatial filter
JP2018084664A (en) * 2016-11-24 2018-05-31 三菱電線工業株式会社 Optical connector structure
CN108957644A (en) * 2017-05-19 2018-12-07 矢崎总业株式会社 Optical connector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0792348A (en) * 1993-09-21 1995-04-07 Toshiba Corp Device for making laser beam incident on optical fiber
CN104521077A (en) * 2012-05-30 2015-04-15 Ipg光子公司 High power spatial filter
JP2018084664A (en) * 2016-11-24 2018-05-31 三菱電線工業株式会社 Optical connector structure
CN108957644A (en) * 2017-05-19 2018-12-07 矢崎总业株式会社 Optical connector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115166906A (en) * 2022-09-05 2022-10-11 度亘激光技术（苏州）有限公司 Optical module

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