An optical fiber collimating system, optical filter and optical modulator

Abstract

The utility model relates to a kind of optical fiber collimation system, optical filter and optical modulator.In the optical fiber collimation system, the direction from optical fiber end face to outside along optical axis includes sequentially: first optical layer and second optical layer, the second optical layer is the layer of solidified flow state material, the inner side of the second optical layer is bonded in the outer side of the first optical layer, and the surface type of the inner side of the second optical layer and the outer side of the first optical layer is complementary, the outer side of the second optical layer has positive optical power;Wherein, the hardness of the first optical layer is greater than the hardness of the second optical layer.The second optical layer made of solidifiable flow state material can more flexibly adjust refractive index, radius of curvature, thickness and other parameters, and no longer need new mold.Effectively improve the flexibility of system, can better meet the demand of optical fiber collimation application under small size, high precision, complex working condition, overcome the problem of insufficient flexibility and applicability of traditional fixed optical fiber collimation system.

Description

Technical Field

[0001] This utility model relates to the fields of physical optics and geometric optics, and in particular to an optical fiber collimation system, an optical filter, and an optical modulator. Background Technology

[0002] A fiber optic collimation system is an optical element used to convert a diverging beam emitted from the end face of an optical fiber into a parallel beam. This conversion is crucial for ensuring high-quality optical signals during transmission, especially in fiber optic communications, laser processing, and other precision optical applications.

[0003] Since the 1990s, the introduction of high-precision optical layers and adjustment mechanisms has enabled fiber optic collimation systems to maintain a small waist size within a specified working distance. In the 21st century, the application of gradient refractive index optical layers has significantly advanced the miniaturization of fiber optic collimation systems. Adaptive fiber optic collimators, utilizing materials such as piezoelectric ceramics for dynamic adjustment, further enhance the system's flexibility and response speed.

[0004] Currently, the most commonly used fiber optic collimation system is the fixed fiber optic collimation system, which includes a constant refractive index collimating optical layer and a gradient refractive index collimating optical layer. Collimation is achieved through refractive index distribution, and it typically exhibits high stability and reliability. However, existing fiber optic collimation systems use a fixed optical layer configuration. While these off-the-shelf (standard) products can meet the needs of most applications in the market, they are difficult to configure flexibly according to specific scenarios. When requirements such as small size, high precision, or special scenarios need to be met, fixed fiber optic collimation systems require newly molded systems and the necessary optical layers and machined components, resulting in high time and material costs. Especially under the current rapid product development paradigm, the cycle time and cost of fixed fiber optic collimation systems are difficult to meet the requirements.

[0005] Therefore, it is increasingly urgent to provide a fiber optic collimation system that can meet the requirements of small size, high precision, and special scenarios, and can be flexibly adjusted. Utility Model Content

[0006] Therefore, it is necessary to provide an optical fiber collimation system, optical filter, and optical modulator to address the above problems, so as to achieve the goal of meeting the requirements of small size, high precision, and special scenarios, while also being flexible in adjustment.

[0007] Therefore, the technical solution adopted by this utility model is as follows:

[0008] An optical fiber collimation system comprises, in sequence along the optical axis from the end face of the optical fiber to the outer side:

[0009] The first optical layer has an optical fiber fixing hole on its inner side for inserting and fixing the optical fiber.

[0010] The second optical layer is a solidified fluid material layer. The inner side of the second optical layer is bonded to the outer side of the first optical layer, and the surface shapes of the inner side of the second optical layer and the outer side of the first optical layer are complementary. The outer side of the second optical layer has positive optical power.

[0011] The hardness of the first optical layer is greater than that of the second optical layer.

[0012] In one embodiment, the fluid material is a resin.

[0013] In one embodiment, a protective layer is provided on the surface of the non-inner side of the second optical layer.

[0014] In one embodiment, the protective layer is a silicon dioxide dielectric layer, or a pyrene coating, or a composite layer consisting of a silicon dioxide dielectric layer and a pyrene coating.

[0015] In one embodiment, the thickness T1 of the outer surface of the first optical layer along the optical axis to the fiber end face, and the diameter D1 and depth D2 of the fiber fixing hole satisfy the following condition:

[0016] In one embodiment, the radius of curvature R3 of the inner surface of the second optical layer, the radius of curvature R4 of the outer surface of the second optical layer, the effective half-aperture H2 of the outer surface of the second optical layer, and the thickness T2 of the inner and outer surfaces of the second optical layer along the optical axis satisfy the following condition:

[0017]

[0018] In one embodiment, the refractive index IND1 of the first optical layer, the effective focal length F1 of the first optical layer, the refractive index IND2 of the second optical layer, and the effective focal length F2 of the second optical layer satisfy the following condition:

[0019] In one embodiment, the thickness T1 of the outer surface of the first optical layer to the fiber end face along the optical axis, the radius of curvature R2 of the outer surface of the first optical layer, the thickness T2 of the inner surface and outer surface of the second optical layer along the optical axis, and the radius of curvature R4 of the outer surface of the second optical layer satisfy the following condition:

[0020] In one embodiment, the refractive index IND1 of the first optical layer, the radius of curvature R2 of the outer surface of the first optical layer, the refractive index IND2 of the second optical layer, and the radius of curvature R4 of the outer surface of the second optical layer satisfy the following condition:

[0021] Another embodiment discloses an optical filter in which the optical fiber collimation system is any one of the optical fiber collimation systems described above.

[0022] Another embodiment discloses an optical modulator in which the optical fiber collimation system is any one of the optical fiber collimation systems described above.

[0023] The fiber optic collimation system disclosed in this invention introduces a second optical layer made of a curable, fluid material, with a positive optical power on its outer surface. Compared to a fixed fiber optic collimation system, the second optical layer, made of a curable, fluid material, allows for more flexible adjustment of parameters such as refractive index, radius of curvature, and thickness, eliminating the need for new molds. Furthermore, the inner surface of the second optical layer is complementary to the outer surface of the first optical layer and is bonded together, with no air gap between them along the optical axis. This eliminates the influence of refractive index differences caused by air gaps, allowing for adaptive adjustments to different scenarios simply by adjusting the parameters of the second optical layer. Therefore, the fiber optic collimation system disclosed in this invention effectively improves system flexibility, better meeting the needs of fiber optic collimation applications in small-size, high-precision, and complex working conditions, overcoming the shortcomings of traditional fixed fiber optic collimation systems in terms of flexibility and applicability.

[0024] Furthermore, the protective layer on the surface of the second optical layer provides protection and enhances its environmental adaptability. The silica dielectric layer not only reduces surface reflection, suppresses stray light, and assists in broadband anti-reflection, but also forms a "hard barrier" on the surface of the second optical layer, improving its resistance to chemical corrosion, aging, hardness, and abrasion, thus enabling the fiber optic collimation system to better meet the needs of consumer-grade eyeglass lenses and industrial lenses. The pyrene coating provides ultra-thin and uniform protection for the second optical layer, improving its biocompatibility and adaptability to extreme environments (high humidity, high temperature, high pressure), making the fiber optic collimation system better suited for medical implant devices, MEMS sensor optical layers, and deep-sea optical equipment. The composite layer consisting of the silica dielectric layer and the pyrene coating combines the advantages of both, further expanding the application boundaries of the fiber optic collimation system.

[0025] In summary, the fiber optic collimation system disclosed in this invention creates a second optical layer by solidifying a flowing material with a specific refractive index, radius of curvature, and thickness. This allows for flexible adjustments based on different scenario requirements, making it highly practical. It is widely applicable to fiber optic communication, laser processing, and other precision optical needs, enabling rapid and low-cost achievement of fiber optic collimation goals, and possesses excellent application prospects. Attached Figure Description

[0026] Figure 1This is a schematic diagram of an optical fiber collimation system structure disclosed in one embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of another fiber optic collimation system structure disclosed in another embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of an optical fiber collimation system structure disclosed in Embodiment 1 of this utility model;

[0029] Figure 4 This is a beam irradiance diagram at the beam waist position of an optical fiber collimation system disclosed in Embodiment 1 of this utility model;

[0030] Figure 5 This is a schematic diagram of an optical fiber collimation system structure disclosed in Embodiment 2 of this utility model;

[0031] Figure 6 This is a beam irradiance diagram at the beam waist position of an optical fiber collimation system disclosed in Embodiment 2 of this utility model;

[0032] Figure 7 This is a schematic diagram of an optical fiber collimation system structure disclosed in Embodiment 3 of this utility model;

[0033] Figure 8 This is a beam irradiance diagram at the beam waist position of an optical fiber collimation system disclosed in Embodiment 3 of this utility model;

[0034] Figure 9 This is a schematic diagram of an optical fiber collimation system structure disclosed in Embodiment 4 of this utility model;

[0035] Figure 10 This is a beam irradiance diagram at the beam waist position of an optical fiber collimation system disclosed in Embodiment 4 of this utility model;

[0036] Figure 11 This is a schematic diagram of an optical fiber collimation system structure disclosed in Embodiment 5 of this utility model;

[0037] Figure 12 This is a beam irradiance diagram at the beam waist position of an optical fiber collimation system disclosed in Embodiment 5 of this utility model;

[0038] Figure 13 This is a schematic diagram of an optical fiber collimation system structure disclosed in Embodiment 6 of this utility model;

[0039] Figure 14 This is a beam irradiance diagram at the beam waist position of an optical fiber collimation system disclosed in Embodiment 6 of this utility model. Detailed Implementation

[0040] To facilitate understanding of this utility model, it will be described in more detail below. However, it should be understood that this utility model can be implemented in many different forms and is not limited to the embodiments or examples described herein. Rather, these embodiments or examples are provided to make the disclosure of this utility model more thorough and complete.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments or examples only and is not intended to be limiting of the invention. The optional scope of the term "and / or" as used herein includes any one of two or more of the related listed items, as well as any and all combinations of the related listed items, including any two related listed items, any more related listed items, or a combination of all related listed items.

[0042] One embodiment of this utility model discloses an optical fiber collimation system, such as... Figure 1 As shown, along the optical axis from the fiber end face to the outside, the sequence includes:

[0043] The first optical layer L1 has an optical fiber fixing hole 101 on its inner side for inserting and fixing optical fibers.

[0044] The second optical layer L2 is a solidified fluid material layer. The inner side of the second optical layer L2 is bonded to the outer side of the first optical layer L1, and the surface shape of the inner side of the second optical layer L2 is complementary to that of the outer side of the first optical layer L1. The outer side of the second optical layer L2 has positive optical power.

[0045] The hardness of the first optical layer L1 is greater than that of the second optical layer L2.

[0046] In this embodiment, the hardness of the first optical layer L1 is greater than that of the second optical layer L2, meaning that the material of the first optical layer L1 can be selected from near-infrared available materials such as fused silica, silicon glass, and sapphire. Furthermore, near-infrared available materials such as fused silica, silicon glass, and sapphire possess good machinability, polishing performance, high-temperature resistance, and chemical stability, thus the first optical layer L1 can provide a good substrate optical layer for the formation of the second optical layer L2. In this embodiment, the second optical layer L2, formed by curing a fluid-state material, is used in a small area of ​​the fiber optic collimation system. This combines the flexibility of curing fluid-state materials with the stability of near-infrared available materials such as fused silica, silicon glass, and sapphire, resulting in a fiber optic collimation system that is both flexible and durable.

[0047] In one embodiment, the fiber fixing hole 101 is formed by mechanical processing, laser-induced modification etching, or photolithography-reactive ion etching process, and the bottom surface of the fiber fixing hole 101 is flat. One end of the fiber is located in the fiber fixing hole 101 and is fixed by adhesive.

[0048] In one embodiment, one end of the fiber is inserted into the first optical layer L1. The refractive properties of the optical layer can be used to optimize the divergence angle, focusing ability, and directional stability of the light beam, thereby solving the problems of energy dispersion, low coupling efficiency, and unstable transmission caused by the natural divergence of the fiber.

[0049] It should be noted that the inner sides of the first optical layer L1 and the second optical layer L2 are the sides closest to the fiber end face and where the laser enters. Therefore, the inner surfaces of the first optical layer L1 and the second optical layer L2 are the sides closest to the fiber end face. The outer sides of the first optical layer L1 and the second optical layer L2 are the sides furthest from the fiber end face and where the laser exits. Therefore, the outer surfaces of the first optical layer L1 and the second optical layer L2 are the sides furthest from the fiber end face.

[0050] Optical power is a physical quantity that measures the ability of an optical element to deflect parallel light beams; essentially, it is the deflection angle per unit distance. Optical power can be divided into positive optical power and negative optical power. Elements with positive optical power have the ability to converge light rays, while elements with negative optical power have the ability to diverge light rays. In this embodiment, the outer surface of the second optical layer L2 is convex and has positive optical power, thus enabling it to converge light rays.

[0051] The fiber optic collimation system disclosed in this embodiment introduces a second optical layer made of a curable, fluid material, with a positive optical power on its outer surface. Compared to a fixed fiber optic collimation system, the second optical layer made of a curable, fluid material allows for more flexible adjustment of parameters such as refractive index, radius of curvature, and thickness, eliminating the need for new molds. Furthermore, the inner surface of the second optical layer is complementary to the outer surface of the first optical layer and is bonded together, with no air gap between them along the optical axis. This eliminates the influence of refractive index differences caused by air gaps, allowing for adaptive adjustments to different scenarios simply by adjusting the parameters of the second optical layer. Therefore, the fiber optic collimation system disclosed in this embodiment effectively improves system flexibility, better meeting the needs of fiber optic collimation applications in small-size, high-precision, and complex working conditions, overcoming the limitations of traditional fixed fiber optic collimation systems in terms of flexibility and applicability.

[0052] In another embodiment, the fluid material is a resin, specifically an acrylic resin or a silicone resin. The selected material, through molecular structure design, balances the rapid curing speed of UV curing with the high performance of thermosetting, making it an ideal material for optical lens manufacturing. Its core value lies in its process flexibility and balanced performance, making it particularly suitable for scenarios with high requirements for reliability, precision, and environmental adaptability.

[0053] Furthermore, the second optical layer is fabricated on the outer surface of the first optical layer using a pneumatic precision dispensing process, and is cured by thermosetting and / or ultraviolet curing.

[0054] Pneumatic precision dispensing technology, with its high precision and controllability, is increasingly being used in the manufacture of resin optical layers (especially small-batch, customized, or complex-structured resin optical layers). This technology achieves micro- or even nano-level precision control of the amount of adhesive by precisely controlling the dispensing process of liquid resin driven by pneumatic pressure, making it particularly suitable for the fabrication of freely moldable optical layers. Therefore, in this embodiment, parameters such as the refractive index, radius of curvature, and thickness of the second optical layer can be flexibly adjusted without the need for new molds.

[0055] When fabricating the second optical layer using a precision air-pressure dispensing and curing process, the flowing material exhibits a certain fluidity. When applied to the outer surface of the first optical layer, the flowing material adheres tightly to it. Consequently, the cured flowing material (the inner surface of the second optical layer) also adheres tightly to the outer surface of the first optical layer. At this point, the surface shapes of the inner surface of the second optical layer and the outer surface of the first optical layer are complementary. That is, after the outlines of the two shapes on the inner and outer surfaces of the second and first optical layers are joined, they can cover a complete area (without overlap or gaps). This eliminates the air gap along the optical axis, thus mitigating the effects of refractive index differences caused by air gaps.

[0056] In another embodiment, such as Figure 2 As shown, a protective layer 102 is provided on the surface of the non-inner side of the second optical layer L2.

[0057] In this embodiment, the protective layer 102 on the surface of the second optical layer L2 can provide protection for the second optical layer L2 and enhance its adaptability to the environment.

[0058] In one embodiment, the protective layer is a silicon dioxide dielectric layer, or a pyrene coating, or a composite layer consisting of a silicon dioxide dielectric layer and a pyrene coating. The silicon dioxide dielectric layer, the pyrene coating, and the composite layer consisting of a silicon dioxide dielectric layer and a pyrene coating can be prepared on the surface of the second optical layer L2 using a PE-CVD process.

[0059] The silica dielectric layer not only reduces surface reflection, suppresses stray light, and assists in broad-spectrum anti-reflection, but also forms a "hard barrier" on the surface of the second optical layer, improving its resistance to chemical corrosion, aging, hardness, and abrasion. This allows the fiber optic collimation system to better meet the needs of consumer-grade eyeglass lenses and industrial lenses. The pyrene coating provides ultra-thin, uniform protection for the second optical layer, improving its biocompatibility and adaptability to extreme environments (high humidity, high temperature, high pressure), making the fiber optic collimation system better suited for medical implants, MEMS sensor optical layers, and deep-sea optical equipment. The composite layer consisting of the silica dielectric layer and the pyrene coating combines the advantages of both, further expanding the application boundaries of the fiber optic collimation system.

[0060] In another embodiment, the thickness T1 of the outer surface of the first optical layer along the optical axis to the fiber end face, and the diameter D1 and depth D2 of the fiber fixing hole satisfy the following condition:

[0061] One embodiment,

[0062] When the thickness T1 of the outer side of the first optical layer to the end face of the optical fiber along the optical axis and the diameter D1 and depth D2 of the optical fiber fixing hole satisfy the above conditions, it can ensure that the optical fiber is inserted into the optical fiber fixing hole and has good optical fiber position accuracy and assembly reliability.

[0063] In another embodiment, the radius of curvature R3 of the inner surface of the second optical layer, the radius of curvature R4 of the outer surface of the second optical layer, the effective half-aperture H2 of the outer surface of the second optical layer, and the thickness T2 of the inner and outer surfaces of the second optical layer along the optical axis satisfy the following condition:

[0064] One embodiment,

[0065] When the curvature radius R3 of the inner side of the second optical layer, the curvature radius R4 of the outer side of the second optical layer, the effective half-aperture H2 of the outer side of the second optical layer, and the thickness T2 of the inner and outer sides of the second optical layer along the optical axis satisfy the above conditions, the ratio of the center thickness to the edge thickness of the second optical layer can be balanced, ensuring that the uncured second optical layer will not deform due to the external environment, which helps to reduce the molding difficulty of the second optical layer of the fiber collimation system.

[0066] In another embodiment, the refractive index IND1 of the first optical layer, the effective focal length F1 of the first optical layer, the refractive index IND2 of the second optical layer, and the effective focal length F2 of the second optical layer satisfy the following condition:

[0067]

[0068] One embodiment,

[0069] When the refractive index IND1 of the first optical layer, the effective focal length F1 of the first optical layer, the refractive index IND2 of the second optical layer, and the effective focal length F2 of the second optical layer satisfy the above condition, the refractive power of the first optical layer and the second optical layer can be balanced, which is beneficial to reducing the high sensitivity of the fiber collimation system to a single optical layer.

[0070] In another embodiment, the thickness T1 of the outer surface of the first optical layer to the fiber end face along the optical axis, the radius of curvature R2 of the outer surface of the first optical layer, the thickness T2 of the inner surface and the outer surface of the second optical layer along the optical axis, and the radius of curvature R4 of the outer surface of the second optical layer satisfy the following condition:

[0071]

[0072] One embodiment,

[0073] When the thickness T1 of the outer side of the first optical layer to the end face of the optical fiber along the optical axis, the radius of curvature R2 of the outer side of the first optical layer, the thickness T2 of the inner side of the second optical layer and the outer side of the second optical layer along the optical axis, and the radius of curvature R4 of the outer side of the second optical layer satisfy the above conditions, the sag of the outermost light rays at the positions of the outer side of the first optical layer and the outer side of the second optical layer can be reduced, the stray light at that position can be reduced, and the return loss of the optical fiber collimation system can be reduced.

[0074] In another embodiment, the refractive index IND1 of the first optical layer, the radius of curvature R2 of the outer surface of the first optical layer, the refractive index IND2 of the second optical layer, and the radius of curvature R4 of the outer surface of the second optical layer satisfy the following condition:

[0075] One embodiment,

[0076] When the refractive index IND1 of the first optical layer, the radius of curvature R2 of the outer surface of the first optical layer, the refractive index IND2 of the second optical layer, and the radius of curvature R4 of the outer surface of the second optical layer satisfy the above conditions, stray light caused by multiple internal reflections of light in the second optical layer can be removed from the effective area, which is beneficial to reducing the return loss of the fiber collimation system.

[0077] In another embodiment, an optical filter (WSS) is disclosed, wherein the optical fiber collimation system in the optical filter is the optical fiber collimation system described in any of the above embodiments.

[0078] The fiber optic collimation system is a key component for achieving efficient optical signal input / output and free-space optical path operation. Its performance directly affects the insertion loss, crosstalk, wavelength stability, and overall reliability of the optical fiber collimation system (WSS).

[0079] In this embodiment, the fiber optic collimation system meets the requirements of any of the above embodiments. Its collimation (divergence angle) is less than 0.5 mrad, ensuring that the beam does not diverge during free space propagation. Its spot diameter (i.e., the half-width at half-maximum of the spot peak intensity) is between 0.2 mm and 2.0 mm, which can match the optical window size of the WSS device. Moreover, it has high alignment accuracy (X / Y: ±0.3 μm to 1 μm; angle <0.5°; Z < ±5 μm), excellent performance in terms of resistance to temperature changes and vibration, and good performance in beam control and collimation at the beam waist position.

[0080] In another embodiment, an optical modulator (OCS) is disclosed, wherein the optical fiber collimation system in the optical modulator is the optical fiber collimation system described in any of the above embodiments.

[0081] As a key optical component of optical modulators, the fiber optic collimation system directly affects the insertion loss, crosstalk, wavelength resolution, switching speed, and overall stability of the optical modulator device. In this embodiment, the fiber optic collimation system meets the requirements of any of the above embodiments. Its collimation (divergence angle) is less than 0.5 mrad, ensuring that the beam does not diverge during free space propagation. Its spot diameter (i.e., the half-width at half-maximum of the spot peak intensity) is between 0.2 mm and 2.0 mm, which can match the optical window size of the OCS device. Moreover, it has high alignment accuracy (X / Y: ±0.3 μm to 1 μm; angle <0.5°; Z < ±5 μm), excellent performance in terms of resistance to temperature changes and vibration, and good performance in beam control and collimation at the beam waist position.

[0082] The fiber optic collimation system disclosed in this utility model will be described below with reference to Tables 1 and 2 and through several specific embodiments.

[0083] Table 1:

[0084]

[0085] Table 1 lists the parameter values ​​for six specific embodiments.

[0086] Table 2:

[0087]

[0088] Table 2 lists the conditional results corresponding to the six specific embodiments in Table 1, all of which are within the range required by the above embodiments.

[0089] Example 1

[0090] Example 1 discloses an optical fiber collimation system, such as Figure 3 As shown, along the optical axis from the fiber end face to the outer side, the sequence includes:

[0091] The first optical layer L1 has an optical fiber fixing hole on its inner side for inserting and fixing the optical fiber.

[0092] The second optical layer L2 is a solidified fluid material layer. The inner side of the second optical layer L2 is bonded to the outer side of the first optical layer L1, and the surface shape of the inner side of the second optical layer L2 is complementary to that of the outer side of the first optical layer L1. The outer side of the second optical layer L2 has positive optical power.

[0093] The hardness of the first optical layer L1 is greater than that of the second optical layer L2.

[0094] In this embodiment, the first optical layer L1 has negative optical power and its outer surface is concave; the second optical layer L2 has positive optical power and its inner surface and outer surface are convex. Specific parameters are shown in Table 1 (Embodiment 1) and Table 2 (Embodiment 1).

[0095] Figure 4 The beam irradiance of the fiber optic collimation system disclosed in Example 1 at the beam waist position is shown. It can be seen that the fiber optic collimation system disclosed in Example 1 exhibits good beam control at the beam waist position and has a good collimation effect.

[0096] Example 2

[0097] Example 2 discloses an optical fiber collimation system, such as Figure 5 As shown, along the optical axis from the fiber end face to the outer side, the sequence includes:

[0098] The first optical layer L1 has an optical fiber fixing hole on its inner side for inserting and fixing the optical fiber.

[0099] The second optical layer L2 is a solidified fluid material layer. The inner side of the second optical layer L2 is bonded to the outer side of the first optical layer L1, and the surface shape of the inner side of the second optical layer L2 is complementary to that of the outer side of the first optical layer L1. The outer side of the second optical layer L2 has positive optical power.

[0100] The hardness of the first optical layer L1 is greater than that of the second optical layer L2.

[0101] In this embodiment, the first optical layer L1 has positive optical power and its outer surface is convex; the second optical layer L2 has positive optical power, its inner surface is concave and its outer surface is convex. Specific parameters are shown in Table 1 (Embodiment 2) and Table 2 (Embodiment 2).

[0102] Figure 6 The beam irradiance of the fiber optic collimation system disclosed in Example 2 at the beam waist position is shown. It can be seen that the fiber optic collimation system disclosed in Example 2 exhibits good beam control at the beam waist position and has a good collimation effect.

[0103] Example 3

[0104] Example 3 discloses an optical fiber collimation system, such as Figure 7 As shown, along the optical axis from the fiber end face to the outer side, the sequence includes:

[0105] The first optical layer L1 has an optical fiber fixing hole on its inner side for inserting and fixing the optical fiber.

[0106] The second optical layer L2 is a solidified fluid material layer. The inner side of the second optical layer L2 is bonded to the outer side of the first optical layer L1, and the surface shape of the inner side of the second optical layer L2 is complementary to that of the outer side of the first optical layer L1. The outer side of the second optical layer L2 has positive optical power.

[0107] The hardness of the first optical layer L1 is greater than that of the second optical layer L2.

[0108] In this embodiment, the first optical layer L1 has positive optical power and its outer surface is convex; the second optical layer L2 has positive optical power, its inner surface is concave and its outer surface is convex. Specific parameters are shown in Table 1 (Embodiment 3) and Table 2 (Embodiment 3).

[0109] Figure 8 The beam irradiance of the fiber optic collimation system disclosed in Example 3 at the beam waist position is shown. It can be seen that the fiber optic collimation system disclosed in Example 3 exhibits good beam control at the beam waist position and has a good collimation effect.

[0110] Example 4

[0111] Example 4 discloses an optical fiber collimation system, such as Figure 9 As shown, along the optical axis from the fiber end face to the outer side, the sequence includes:

[0112] The first optical layer L1 has an optical fiber fixing hole on its inner side for inserting and fixing the optical fiber.

[0113] The second optical layer L2 is a solidified fluid material layer. The inner side of the second optical layer L2 is bonded to the outer side of the first optical layer L1, and the surface shape of the inner side of the second optical layer L2 is complementary to that of the outer side of the first optical layer L1. The outer side of the second optical layer L2 has positive optical power.

[0114] The hardness of the first optical layer L1 is greater than that of the second optical layer L2.

[0115] In this embodiment, the first optical layer L1 has negative optical power and its outer surface is concave; the second optical layer L2 has positive optical power and its inner surface and outer surface are convex. Specific parameters are shown in Table 1 (Embodiment 4) and Table 2 (Embodiment 4).

[0116] Figure 10 The beam irradiance of the fiber optic collimation system disclosed in Example 4 at the beam waist position is shown. It can be seen that the fiber optic collimation system disclosed in Example 4 exhibits good beam control at the beam waist position and has a good collimation effect.

[0117] Example 5

[0118] Example 5 discloses an optical fiber collimation system, such as Figure 11 As shown, along the optical axis from the fiber end face to the outer side, the sequence includes:

[0119] The first optical layer L1 has an optical fiber fixing hole on its inner side for inserting and fixing the optical fiber.

[0120] The second optical layer L2 is a solidified fluid material layer. The inner side of the second optical layer L2 is bonded to the outer side of the first optical layer L1, and the surface shape of the inner side of the second optical layer L2 is complementary to that of the outer side of the first optical layer L1. The outer side of the second optical layer L2 has positive optical power.

[0121] The hardness of the first optical layer L1 is greater than that of the second optical layer L2.

[0122] In this embodiment, the first optical layer L1 has negative optical power and its outer surface is concave; the second optical layer L2 has positive optical power, its inner surface is concave and its outer surface is convex. Specific parameters are shown in Table 1 (Embodiment 5) and Table 2 (Embodiment 5).

[0123] Figure 12 The beam irradiance of the fiber optic collimation system disclosed in Example 5 at the beam waist position is shown. It can be seen that the fiber optic collimation system disclosed in Example 5 exhibits good beam control at the beam waist position and has a good collimation effect.

[0124] Example 6

[0125] Example 6 discloses an optical fiber collimation system, such as Figure 13 As shown, along the optical axis from the fiber end face to the outer side, the sequence includes:

[0126] The first optical layer L1 has an optical fiber fixing hole on its inner side for inserting and fixing the optical fiber.

[0127] The second optical layer L2 is a solidified fluid material layer. The inner side of the second optical layer L2 is bonded to the outer side of the first optical layer L1, and the surface shape of the inner side of the second optical layer L2 is complementary to that of the outer side of the first optical layer L1. The outer side of the second optical layer L2 has positive optical power.

[0128] The hardness of the first optical layer L1 is greater than that of the second optical layer L2.

[0129] In this embodiment, the first optical layer L1 has negative optical power and its outer surface is concave; the second optical layer L2 has positive optical power and its inner surface and outer surface are convex. Specific parameters are shown in Table 1 (Embodiment 6) and Table 2 (Embodiment 6).

[0130] Figure 14 The beam irradiance of the fiber optic collimation system disclosed in Example 6 at the beam waist position is shown. It can be seen that the fiber optic collimation system disclosed in Example 6 exhibits good beam control at the beam waist position and has a good collimation effect.

[0131] As can be seen from the above embodiments, compared with the fixed fiber optic collimation system, the fiber optic collimation system provided by this utility model introduces a second optical layer made of a curable, fluid material, which allows for more flexible adjustment of parameters such as refractive index, radius of curvature, and thickness, eliminating the need for new molds. Furthermore, the inner surface of the second optical layer is complementary to the outer surface of the first optical layer and is bonded together, with no air gap between them in the optical axis direction. This eliminates the influence of refractive index differences caused by air gaps, allowing for adaptive adjustments to different scenarios simply by adjusting the parameters of the second optical layer.

[0132] Furthermore, as can be seen from Examples 1 to 6, within the parameter range disclosed in the embodiments of this utility model, the optical fiber collimation system exhibits good beam control at the beam waist position and has a good collimation effect.

[0133] In summary, the fiber optic collimation system disclosed in this utility model effectively improves the system's flexibility, better meets the needs of fiber optic collimation applications in small size, high precision, and complex working conditions, and overcomes the problems of insufficient flexibility and applicability of traditional fixed fiber optic collimation systems.

[0134] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The terms "first" and "second" used in this document are for distinction only and are not intended to limit the content of this utility model.

[0135] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An optical fiber collimation system, characterized in that, Along the optical axis, from the fiber end face to the outer side, the following are included in sequence: The first optical layer has an optical fiber fixing hole on its inner side for inserting and fixing the optical fiber. The second optical layer is a solidified fluid material layer. The inner side of the second optical layer is bonded to the outer side of the first optical layer, and the surface features of the inner side of the second optical layer and the outer side of the first optical layer are complementary. The outer side of the second optical layer has positive optical power. The hardness of the first optical layer is greater than that of the second optical layer.

2. The fiber optic collimation system according to claim 1, characterized in that, The material in the fluid state is resin.

3. The fiber optic collimation system according to claim 1, characterized in that, A protective layer is provided on the surface of the non-inner side of the second optical layer.

4. The fiber optic collimation system according to claim 3, characterized in that, The protective layer is a silicon dioxide dielectric layer, or a pyrene coating, or a composite layer consisting of a silicon dioxide dielectric layer and a pyrene coating.

5. The fiber optic collimation system according to claim 1, characterized in that, The thickness T1 of the outer surface of the first optical layer along the optical axis to the fiber end face, and the diameter D1 and depth D2 of the fiber fixing hole satisfy the following condition:

6. The fiber optic collimation system according to claim 1, characterized in that, The radius of curvature R3 of the inner surface of the second optical layer, the radius of curvature R4 of the outer surface of the second optical layer, the effective half-aperture H2 of the outer surface of the second optical layer, and the thickness T2 of the inner and outer surfaces of the second optical layer along the optical axis satisfy the following condition:

7. The fiber optic collimation system according to claim 1, characterized in that, The refractive index IND1 of the first optical layer, the effective focal length F1 of the first optical layer, the refractive index IND2 of the second optical layer, and the effective focal length F2 of the second optical layer satisfy the following condition:

8. The fiber optic collimation system according to claim 1, characterized in that, The thickness T1 of the outer surface of the first optical layer to the fiber end face along the optical axis, the radius of curvature R2 of the outer surface of the first optical layer, the thickness T2 of the inner surface and the outer surface of the second optical layer along the optical axis, and the radius of curvature R4 of the outer surface of the second optical layer satisfy the following condition:

9. The fiber optic collimation system according to claim 1, characterized in that, The refractive index IND1 of the first optical layer, the radius of curvature R2 of the outer surface of the first optical layer, the refractive index IND2 of the second optical layer, and the radius of curvature R4 of the outer surface of the second optical layer satisfy the following condition:

10. An optical filter, characterized in that, The optical fiber collimation system in the optical filter is the optical fiber collimation system described in any one of claims 1 to 9.

11. An optical modulator, characterized in that, The optical fiber collimation system in the optical modulator is the optical fiber collimation system described in any one of claims 1 to 9.

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