Uniform light coupling optical fiber and optical fiber signal acquisition device

Abstract

The utility model discloses a light-equalizing coupling optical fiber which comprises an outer sleeve and a group of fiber cores arranged in the outer sleeve, the periphery of each fiber core is filled with an adhesive playing a bonding role, the fiber cores are divided into a central area and a peripheral area sleeved on the central area in the outer sleeve, the fiber cores in the peripheral area comprise an emergent fiber core and an incident fiber core, and the emergent fiber core and the incident fiber core are arranged in the central area. The emergent fiber core and the incident fiber core are matched with each other to form a circular ring shape, the emergent fiber core and the incident fiber core in the peripheral area are symmetrically arranged, and the emergent area and the incident area of the emergent fiber core and the incident fiber core are equal or the same. The beneficial effects of the utility model are mainly reflected as follows: the design is exquisite, when the central axis of the optical element is not coaxial with the central axis of the optical fiber, that is, the optical fiber coupling element is not aligned with the optical fiber, at the moment, the emergent fiber core and the incident fiber core are symmetrically arranged in the peripheral area, and the light emergent area and the light incident area are equivalent; the variable quantity of the light inlet area and the light outlet area is very small, so that the difference value of the light passing quantity is very small, and the detection accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fibers, and in particular to a uniform light coupling optical fiber and an optical fiber signal acquisition device. Background Art

[0002] With the development of science and technology, fiber optic sensors have been widely used in biology, medicine, industrial measurement and other fields. Fiber optic sensors are generally coupled by optical fibers and optical components, and the optical components include but are not limited to probes and spot converters.

[0003] like Figure 1 As shown, the coupling optical fiber in the prior art includes an input optical fiber 100 and an output optical fiber 101, wherein the input optical fiber 101 surrounds the output optical fiber 101 and is tangent to the output optical fiber 101. The coupling technology between the coupling optical fiber and the optical element is the key to ensure the efficiency and accuracy of signal transmission. Traditional coupling methods mostly use mechanical methods to connect the optical element and the optical fiber end face through an external adapter or a fixing device, such as the optical fiber coupling device and the automatic coupling control method of the optical fiber coupling device disclosed in Chinese patent CN117192707B.

[0004] However, the above coupling method faces great challenges in alignment concentricity. Any deviation of the adjustment device will lead to coupling eccentricity, reducing coupling efficiency and stability. Specifically, when the optical element is eccentric, that is, the central axis of the optical element is not coaxial with the central axis of the light-emitting optical fiber 101, at this time, the light-incoming area injected through the light-incoming optical fiber 100 becomes smaller, and the light-emitting area is constant. The light flux is the sum of the product of the light-incoming area and the light-emitting area. It can be seen that the light-incoming area is proportional to the light flux. When the eccentricity value of the optical element 6 is larger, the light-incoming area is smaller, the light flux is smaller, and the difference in light flux is larger, and the coupling efficiency and stability are worse. In addition, mechanical coupling requires fine machining and assembly, which not only increases the production cost, but also reduces the production efficiency, and has great limitations. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a uniform light coupling optical fiber and an optical fiber signal acquisition device.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] A uniformly light-coupled optical fiber comprises an outer sleeve and a group of fiber cores arranged therein, wherein the fiber cores are filled with an adhesive for bonding, and the inner area of ​​the outer sleeve is divided into a central area and a peripheral area arranged outside the central area, and the fiber cores located in the peripheral area include an exit fiber core and an incident fiber core, and the exit fiber core and the incident fiber core cooperate with each other to form a circular ring shape, and the exit fiber core and the incident fiber core located in the peripheral area are symmetrically arranged, and the total light-emitting area of ​​the exit fiber core is equal to or the same as the total light-entering area of ​​the incident fiber core.

[0008] Preferably, the number of exit fiber cores and incident fiber cores located in the peripheral area is the same, and they are staggered in pairs.

[0009] Preferably, the exit fiber cores located in the peripheral area are divided into a group of exit fiber core groups, and the incident fiber cores located in the peripheral area are divided into a group of incident fiber core groups, the number of the exit fiber core groups and the incident fiber core groups are the same, and are staggered, and each group of the exit fiber core groups and the incident fiber core group includes at least two of the exit fiber cores and the incident fiber cores.

[0010] Preferably, the central area is circular, and the exit fiber core and the incident fiber core are arranged inside, and the outer circumferential surfaces of the exit fiber core and the incident fiber core are tangent to each other.

[0011] Preferably, the exit fiber core and the incident fiber core located in the central area are staggered.

[0012] Preferably, the diameters of the exit fiber core and the incident fiber core are the same or equivalent.

[0013] A fiber optic signal collection device comprises any of the above-described evenly-coupled optical fibers and an optical element coupled thereto, wherein the outer diameter of the optical element is greater than the diameter of the central region and less than or equal to the diameter of the peripheral region, and a light source and a collector are provided on the same side of the evenly-coupled optical fiber, the light beam emitted by the light source is emitted into an incident fiber core, and the light beam reflected by the optical element is emitted to the collector through an exit fiber core.

[0014] Preferably, the optical element is a probe.

[0015] Preferably, the optical element and the light-coupling optical fiber are mechanically coupled or adhesively coupled.

[0016] The beneficial effects of the utility model are mainly reflected in:

[0017] 1. Exquisite design. When the central axis of the optical element is not coaxial with the central axis of the optical fiber, that is, the optical fiber coupling element is not aligned with the optical fiber, at this time, since the exit fiber core and the incident fiber core are symmetrically arranged in the peripheral area and the light exit area is equivalent to the light entrance area, the change in the light entrance area and the light exit area is very small, so the difference in the amount of light passing is very small, which is conducive to improving the accuracy of detection. In addition, the optical fiber does not need to be precisely aligned with the optical element, which reduces the difficulty of machining and assembly, greatly improves production efficiency, and at the same time, improves the efficiency and stability of coupling, and has a wide range of applicability;

[0018] 2. The diameters of the exit fiber core and the incident fiber core are the same or equivalent, so as to ensure that the light output area and light input area of ​​the exit fiber core and the incident fiber core are equivalent, reduce the difference in light transmission, and improve stability and accuracy;

[0019] 3. The uniform distribution of the light exit area and the light entrance area allows the core of each part to be uniformly collected, which helps to improve the spatial resolution of the entire collector surface. Especially in applications that require precise local analysis, this layout can provide more detailed spatial information and increase applicability. It can greatly improve high-end optical communication systems, such as long-distance optical fiber networks and optical links in data centers, high-precision optical measurements, and medical imaging, and can minimize signal loss and interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The technical solution of the utility model is further described below in conjunction with the accompanying drawings:

[0021] Figure 1 : Schematic diagram of the structure of the coupling optical fiber in the prior art;

[0022] Figure 2 : A schematic structural diagram of the first preferred embodiment of the optical coupling optical fiber in the utility model;

[0023] Figure 3 : A schematic structural diagram of a second preferred embodiment of an average light coupling optical fiber in the utility model;

[0024] Figure 4 : A schematic diagram of the structure of the third preferred embodiment of the optical coupling optical fiber in the utility model

[0025] Figure 5 : A schematic diagram of the structure of the optical fiber signal acquisition device in the preferred embodiment of the utility model. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0028] like Figures 2 to 4 As shown, the utility model discloses a uniform light coupling optical fiber, including an outer sleeve 1 and a group of fiber cores 2 arranged therein, and the fiber cores 2 are surrounded by an adhesive 3 that plays a bonding role. In the preferred embodiment, the adhesive 3 is a two-component epoxy adhesive for ThreeBond 2081E optical fiber. The two-component epoxy adhesive can be quickly cured at medium temperature, and the color changes from light yellow to dark brown during curing. The degree of curing can be observed by the color during curing, and the higher the degree of curing, the darker the color. In addition, the two-component epoxy adhesive is in liquid form under normal conditions, has moderate viscosity, good dispensing operability, high bonding strength and excellent moisture and heat resistance. Of course, other adhesives can also be used, all of which belong to the protection scope of the utility model and will not be described in detail here.

[0029] The inner area of ​​the outer sleeve 1 is divided into a central area 11 and a peripheral area 12 arranged outside the central area 11. The fiber core 2 located in the peripheral area 12 includes an exit fiber core 21 and an incident fiber core 22. The exit fiber core 21 and the incident fiber core 22 cooperate with each other to form a circular ring. The exit fiber core 21 and the incident fiber core 22 located in the peripheral area 12 are symmetrically arranged, and the total light exit area of ​​the exit fiber core 21 is equal to or the same as the total light entrance area of ​​the incident fiber core 22. The above design is ingenious. When the central axis of the optical element is not coaxial with the central axis of the optical fiber, that is, the optical fiber coupling element is not aligned with the optical fiber, at this time, since the exit fiber core and the incident fiber core are symmetrically arranged in the peripheral area and the light exit area is equal to the light entrance area, the change amount of the light entrance area and the light exit area is very small, so the difference in the amount of light transmission is very small, which is conducive to improving the accuracy of detection. In addition, the optical fiber does not need to be precisely aligned with the optical element, which reduces the difficulty of machining and assembly and greatly improves production efficiency. At the same time, it improves the efficiency and stability of coupling and has a wide range of applicability.

[0030] In the utility model, the outer circumference of each of the exit fiber cores 21 is tangent to the outer circumference of the incident fiber core 22, so that the overall structure is more compact, the layout is more reasonable, and the diameter of the wire bundle is reduced. In addition, in this preferred embodiment, the diameters of the exit fiber core 21 and the incident fiber core 22 are the same or equivalent, so as to ensure that the light exit area and the light entrance area of ​​the exit fiber core 21 and the incident fiber core 22 are equivalent, reduce the difference in the amount of light transmitted, and improve stability and accuracy.

[0031] like Figure 2As shown, it is the first preferred embodiment of the utility model, the number of the output fiber cores 21 and the incident fiber cores 22 located in the peripheral area 12 is the same, and they are staggered in pairs. This arrangement can make the light-emitting area and the light-entering area of ​​the output fiber cores 21 and the incident fiber cores 22 quite the same, thereby minimizing the difference in the amount of light transmitted and improving the accuracy of coupling.

[0032] like Figure 3 to Figure 4 As shown, it is the second preferred embodiment of the utility model. In this embodiment, the output fiber cores 21 located in the peripheral area 12 are divided into a group of output fiber core groups, and the incident fiber cores 22 located in the peripheral area 12 are divided into a group of incident fiber core groups. The number of the output fiber core groups and the incident fiber core groups is the same, and they are staggered. Each group of the output fiber core group and the incident fiber core group includes at least two of the output fiber cores 21 and the incident fiber core 22. In this preferred embodiment, it is taken as an example that each group of the output fiber core group and the incident fiber core group includes three of the output fiber cores 21 and the incident fiber core 22. Of course, other numbers can also be used, and corresponding adjustments can be made according to actual needs. They all belong to the protection scope of the utility model and will not be described in detail here.

[0033] like Figures 2 to 3 As shown, in this preferred embodiment, the central area 11 is circular, and the exit fiber core 21 and the incident fiber core 22 are arranged inside. The outer circumferences of the exit fiber core 21 and the incident fiber core 22 are tangent and staggered. Of course, the central area 11 can also adopt other layout methods, such as Figure 4 As shown, all belong to the protection scope of the present utility model and will not be described in detail here.

[0034] like Figure 5 As shown, the utility model also discloses a fiber optic signal acquisition device, including an evenly light-coupled optical fiber and an optical element 6 coupled thereto, wherein the outer diameter of the optical element 6 is greater than the diameter of the central area 11 and less than or equal to the diameter of the peripheral area 12, and a light source 4 and a collector 5 are provided on the same side of the evenly light-coupled optical fiber, and the light beam emitted by the light source 4 is injected into the incident fiber core 22, and the light beam reflected by the optical element 6 is emitted to the collector 5 through the exit fiber core 21. The uniform distribution of the light exit area and the light entrance area mentioned above enables the fiber core of each part to be uniformly collected, which helps to improve the spatial resolution of the entire collector surface. In particular, in applications that require precise local analysis, this layout can provide more detailed spatial information and increase applicability. It can greatly improve high-end optical communication systems, such as long-distance optical fiber networks and optical links in data centers, high-precision optical measurements, and medical imaging, and can minimize signal loss and interference.

[0035] In this preferred embodiment, the optical element 6 is a probe. Of course, it is not limited to a probe, and may also be other optical elements, all of which fall within the scope of protection of the present utility model, and will not be described in detail here. The optical element 6 is mechanically coupled or adhesively coupled to the optical fiber. It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should treat the specification as a whole. The technical solutions in each implementation method may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0036] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the utility model. They are not intended to limit the protection scope of the utility model. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A homogeneous light coupling optical fiber, comprising an outer sleeve (1) and a group of fiber cores (2) arranged therein, wherein the fiber cores (2) are surrounded by an adhesive (3) for bonding, characterized in that: The inner area of ​​the outer sleeve (1) is divided into a central area (11) and a peripheral area (12) arranged outside the central area (11); the fiber core (2) located in the peripheral area (12) comprises an exit fiber core (21) and an incident fiber core (22); the exit fiber core (21) and the incident fiber core (22) cooperate with each other to form a circular ring shape; the exit fiber core (21) and the incident fiber core (22) located in the peripheral area (12) are symmetrically arranged, and the total light-emitting area of ​​the exit fiber core (21) is equal to or the same as the total light-entering area of ​​the incident fiber core (22).

2. The optical fiber according to claim 1, characterized in that: The number of exit fiber cores (21) and incident fiber cores (22) located in the peripheral area (12) is the same, and they are arranged in a staggered manner.

3. The evenly coupled optical fiber according to claim 1, characterized in that: The exit fiber cores (21) located in the peripheral region (12) are divided into a group of exit fiber core groups, and the incident fiber cores (22) located in the peripheral region (12) are divided into a group of incident fiber core groups. The exit fiber core groups and the incident fiber core groups have the same number and are arranged alternately, and each group of the exit fiber core group and the incident fiber core group includes at least two of the exit fiber cores (21) and the incident fiber cores (22).

4. The evenly coupled optical fiber according to claim 2 or 3, characterized in that: The central area (11) is circular, and the exit fiber core (21) and the incident fiber core (22) are arranged inside, and the outer circumferential surfaces of the exit fiber core (21) and the incident fiber core (22) are tangent to each other.

5. The evenly coupled optical fiber according to claim 4, characterized in that: The exit fiber cores (21) and incident fiber cores (22) located in the central area (11) are arranged in an alternating manner.

6. The evenly coupled optical fiber according to claim 1, characterized in that: The diameters of the exit fiber core (21) and the incident fiber core (22) are the same or equivalent.

7. The optical fiber signal acquisition device is characterized by: The optical fiber comprises a uniform light coupling optical fiber as claimed in any one of claims 1 to 6 and an optical element (6) coupled thereto, wherein the outer diameter of the optical element (6) is greater than the diameter of the central area (11) and less than or equal to the diameter of the peripheral area (12), and a light source (4) and a collector (5) are provided on the same side of the uniform light coupling optical fiber, the light beam emitted by the light source (4) is emitted into an incident fiber core (22), and the light beam reflected by the optical element (6) is emitted to the collector (5) through an exit fiber core (21).

8. The optical fiber signal acquisition device according to claim 7, characterized in that: The optical element (6) is a probe.

9. The optical fiber signal acquisition device according to claim 7, characterized in that: The optical element (6) and the light-averaging coupling optical fiber are mechanically coupled or adhesively coupled.

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