Miniaturized 1x2 polarization maintaining fiber coupler device

Abstract

The utility model relates to a kind of miniaturization 1x2 polarization maintaining fiber coupler device, including double optical fiber collimator, single optical fiber collimator and third glass tube, the third glass tube is sleeved in double optical fiber collimator and single optical fiber collimator outside, the double optical fiber collimator and single optical fiber collimator are respectively arranged in the both ends of third glass tube, the outer end of the double optical fiber collimator and single optical fiber collimator is encapsulated, and is cured by ultraviolet glue.Using the miniaturization 1x2 polarization maintaining fiber coupler device of the utility model, cost saving, small loss, polarization maintaining functionality is strong (realize slow axis light, fast axis cut-off and the like functions), size miniaturization.Using the Clens structure of two sides symmetry, and using polarization film piece to save cost and reduce loss and have higher polarization maintaining optical performance.Used widely in optical network system, multi-channel optical signal monitoring, optical switching connection system, optical fiber debugging and measurement system and the like field.

Description

Technical Field

[0001] This utility model relates to the field of modern optical communication, and more particularly to the field of polarization-maintaining coupling devices, specifically a miniaturized 1×2 polarization-maintaining fiber coupler device. Background Technology

[0002] Currently, achieving a good extinction ratio in polarization-maintaining coupling devices is difficult, making it impossible to achieve slow-axis pass-through and fast-axis cut-off, or vice versa. There is no choice in polarization-maintaining performance, and the optical parameters are poor, failing to meet the stringent requirements of optical networks. This invention, a miniaturized 1×2 polarization-maintaining fiber coupler, overcomes these problems. By changing the traditional manufacturing method, it uses a symmetrical Clens structure and a polarization film to save costs and reduce losses while maintaining high polarization-maintaining optical performance, such as the selectability of polarization-maintaining states. Furthermore, through size adjustments, it becomes a miniaturized product with 1×2 ports. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a miniaturized 1×2 polarization-maintaining fiber coupler device that is cost-effective, has low loss, strong polarization-maintaining function, and is widely applicable.

[0004] To achieve the above objectives, the miniaturized 1×2 polarization-maintaining fiber coupler device of this invention is as follows: The main feature of this miniaturized 1×2 polarization-maintaining fiber coupler device is that the device includes a dual-fiber collimator, a single-fiber collimator, and a third glass tube. The third glass tube is sleeved around the dual-fiber collimator and the single-fiber collimator. The dual-fiber collimator and the single-fiber collimator are respectively located at both ends of the third glass tube. The outer ends of the dual-fiber collimator and the single-fiber collimator are encapsulated and cured with ultraviolet adhesive.

[0005] Preferably, the dual-fiber collimator includes a dual-fiber pigtail, a plano-convex lens, a first glass tube, a second glass tube, a polarizing film, and a TAP filter. The end face of the dual-fiber pigtail has a polishing angle of 8 degrees and is coated with a corresponding anti-reflection coating. One end face of the plano-convex lens has a polishing angle of 8±0.3 degrees and is coated with a corresponding anti-reflection coating, while the other end face is spherical. The dual-fiber pigtail and the plano-convex lens are fixed by the first glass tube. The second glass tube is fitted onto the plano-convex lens, and the TAP filter is attached to the other end face of the second glass tube.

[0006] Preferably, the dual-fiber collimator further includes a polarizing film, and the dual-fiber pigtail includes a first fiber and a second fiber, with the polarizing film attached to the second fiber.

[0007] Preferably, the single-fiber collimator includes a single fiber pigtail, a plano-convex lens, a polarizing film, and a first glass tube. The end face of the single fiber pigtail has a polishing angle of 8 degrees and is coated with a corresponding anti-reflection coating. One end face of the plano-convex lens has a polishing angle of 8±0.3 degrees and is coated with a corresponding anti-reflection coating, while the other end face is spherical. The single fiber pigtail and the plano-convex lens are fixed by the first glass tube.

[0008] Preferably, the single-fiber collimator further includes a polarizing film, and the single-fiber pigtail includes a third fiber, with the polarizing film attached to the third fiber of the single-fiber pigtail.

[0009] Preferably, the single fiber pigtail and plano lens are assembled with the first glass tube by curing with epoxy resin.

[0010] Preferably, the diameter of the dual fiber optic pigtail is 1.8 mm and the length is 3.0 to 3.5 mm; the outer diameter of the first glass tube is 2.2 mm and the length is 6 mm; the outer diameter of the second glass tube is 2.1 mm and the length is 2 mm; and the radius of curvature of the spherical end face of the plano-convex lens is 1.419 and the center length is 2.73 mm.

[0011] Preferably, the diameter of the single fiber pigtail is 1.8 mm and the length is 3.0 to 3.5 mm, the outer diameter of the third glass tube is 2.4 mm and the length is 16 mm, and the radius of curvature of the spherical end face of the plano-convex lens is 1.419 and the center length is 2.73 mm.

[0012] This invention relates to a miniaturized 1×2 polarization-maintaining fiber coupler device, which offers cost savings, low loss, strong polarization-maintaining functionality (achieving slow-axis pass-through and fast-axis cut-off), and compact size. It utilizes a symmetrical Clens structure and a polarization film to reduce cost and loss while maintaining high polarization-maintaining optical performance. It can be widely used in optical network systems, multi-channel optical signal monitoring, optical switching connection systems, fiber optic debugging and measurement systems, and other fields. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the miniaturized 1×2 polarization-maintaining fiber coupler device of this utility model.

[0014] Figure 2 This is a schematic diagram of the dual-fiber collimator of the miniaturized 1×2 polarization-maintaining fiber coupler device of this utility model.

[0015] Figure 3 This is a schematic diagram of the single-fiber collimator of the miniaturized 1×2 polarization-maintaining fiber coupler device of this utility model.

[0016] Figure label: 1. Dual fiber pigtails 2 Single fiber pigtail 3. Plano-convex lens 4 TAP filters 5. Polarizing thin film 6 First glass tube 7 Second glass tube 8 Third glass tube 9. Epoxy resin 10 UV adhesive Detailed Implementation

[0017] To more clearly describe the technical content of this utility model, the following description is provided in conjunction with specific embodiments.

[0018] The miniaturized 1×2 polarization-maintaining fiber coupler device of this invention includes a dual-fiber collimator, a single-fiber collimator, and a third glass tube. The third glass tube is sleeved around the dual-fiber collimator and the single-fiber collimator. The dual-fiber collimator and the single-fiber collimator are respectively disposed at both ends of the third glass tube. The outer ends of the dual-fiber collimator and the single-fiber collimator are encapsulated and cured with ultraviolet adhesive.

[0019] In a preferred embodiment of this utility model, the dual-fiber collimator includes a dual-fiber pigtail 1, a plano-convex lens 3, a first glass tube 6, a second glass tube 7, a polarizing film 5, and a TAP filter 4. The end face of the dual-fiber pigtail 1 is polished at an angle of 8 degrees and coated with a corresponding anti-reflection film. One end face of the plano-convex lens 3 is polished at an angle of 8 ± 0.3 degrees and coated with a corresponding anti-reflection film, while the other end face is spherical. The dual-fiber pigtail 1 and the plano-convex lens 3 are fixed by the first glass tube 6. The second glass tube 7 is fitted onto the plano-convex lens 3, and the TAP filter 4 is attached to the other end face of the second glass tube 7.

[0020] In a preferred embodiment of the present invention, the dual-fiber collimator further includes a polarizing film 5, and the dual-fiber pigtail 1 includes a first fiber a and a second fiber b, with the polarizing film 5 attached to the second fiber b.

[0021] In a preferred embodiment of this utility model, the single-fiber collimator includes a single-fiber pigtail 2, a plano-convex lens 3, a polarizing film 5, and a first glass tube 6. The end face of the single-fiber pigtail 2 is polished at an angle of 8 degrees and coated with a corresponding anti-reflection film. One end face of the plano-convex lens 3 is polished at an angle of 8 ± 0.3 degrees and coated with a corresponding anti-reflection film, while the other end face is spherical. The single-fiber pigtail 2 and the plano-convex lens 3 are fixed by the first glass tube 6.

[0022] In a preferred embodiment of the present invention, the single-fiber collimator further includes a polarizing film 5, the single-fiber pigtail 2 includes a third fiber, and the polarizing film 5 is attached to the third fiber of the single-fiber pigtail 2.

[0023] In a preferred embodiment of this utility model, the single fiber pigtail 1 and plano lens 3 are assembled with the first glass tube 6 by curing with epoxy resin.

[0024] In a preferred embodiment of this utility model, the diameter of the dual fiber optic pigtail 1 is 1.8 mm and the length is 3.0-3.5 mm; the outer diameter of the first glass tube 6 is 2.2 mm and the length is 6 mm; the outer diameter of the second glass tube 7 is 2.1 mm and the length is 2 mm; and the radius of curvature of the spherical end face of the plano-convex lens 3 is 1.419 and the center length is 2.73 mm.

[0025] In a preferred embodiment of this utility model, the single optical fiber pigtail 2 has a diameter of 1.8 mm and a length of 3.0 to 3.5 mm, the third glass tube 8 has an outer diameter of 2.4 mm and a length of 16 mm, and the plano-convex lens 3 has a spherical end face with a radius of curvature of 1.419 and a center length of 2.73 mm.

[0026] In a specific embodiment of this utility model, a miniaturized 1×2 polarization-maintaining fiber coupler is disclosed, such as... Figure 1 As shown.

[0027] One end consists of a dual-fiber collimator, a polarizing thin film, and a TAP filter, such as... Figure 2 As shown, it includes a branch Dual fiber pigtails 1, one plano-convex lens 3, outer diameter A first glass tube with a length of 6mm, and an outer diameter of 6... 7. Two glass tubes, each 2mm long; 5. One polarizing film; 4. One TAP filter.

[0028] One of them The 1 mm dual-fiber pigtail has an 8-degree polished end face and is coated with an anti-reflection film. Its length is controlled between 3.0 and 3.5 mm. Figure 2 As shown.

[0029] exist A polarizing film 5 is attached to the second fiber of the mm twin-fiber pigtail 1. Incident light can pass completely in its polarization direction, while achieving over 99% isolation in the direction perpendicular to the polarization direction. It exhibits excellent extinction ratio performance. This polarizer is applied in the reflected light path from the first fiber end a to the second fiber end b. The path is as follows: input light enters from the first fiber end a, passes through a lens, then through a TAP filter, reflects the power, returns to the lens, encounters the polarizing film 5, and finally returns to the second fiber end b.

[0030] It includes a plano-convex lens 3, one side of which is polished to 8±0.3 degrees and coated with a corresponding anti-reflective coating, and the other side is spherical with a radius of curvature R1.419 and a center length of 2.73mm. Figure 2 As shown. The single fiber optic pigtail 1 and the plano-convex lens 3 are fixed by the first glass tube 6 and assembled using epoxy resin thermosetting adhesive. Figure 2 As shown.

[0031] An outer diameter is fitted onto the plano-convex lens 3. 7. Second glass tube, 2mm in length.

[0032] A TAP filter 4 is attached to the other end face of the second glass tube 7.

[0033] The other end is a single-fiber collimator with a polarizing thin film end, such as... Figure 3 It includes a branch 2. Single fiber pigtail with an 8-degree polished end face and coated with an anti-reflection film; 3. Plano-convex lens; 5. Polarizing film; 6. Outer diameter... A first glass tube with a length of 6mm, and an outer diameter of 6... 8. Second glass tube, 16mm in length.

[0034] The other end is: a single-fiber collimator with a polarizing thin film end, such as... Figure 3 ; There is a branch at the other end Single-fiber pigtail 2, with an 8-degree polished end face and coated with an anti-reflection film, has a length controlled between 3.0 and 3.5 mm. Figure 3 .

[0035] exist A polarizing film 5 is attached to the third fiber c of the single-fiber pigtail 2. Incident light can pass through completely in its polarization direction, while achieving over 99% isolation in the direction perpendicular to the polarization direction. It exhibits excellent extinction ratio performance. This polarizer is used in the reflected light path from the first fiber end a to the third fiber end c. The path is as follows: input light enters from the first fiber end a, passes through a lens, then through a TAP filter, and the transmitted power is measured. The light then passes through the lens 3 at the single-fiber collimator with the polarizing film, and then encounters the polarizing film 5 at the single-fiber collimator with the polarizing film, finally exiting from the third fiber end c of the single-fiber pigtail 2.

[0036] At the other end, there is also a plano-convex lens 3, with both sides polished to 8+ / -0.3 degrees and coated with corresponding anti-reflective coatings. The other side is spherical with a radius of curvature R1.419 and a center length of 2.73mm. Figure 3 . The single fiber optic pigtail 2 and the plano-convex lens 3 are fixed through the first glass tube 6 and assembled using epoxy thermosetting adhesive. Figure 2 .

[0037] The two ends are externally encapsulated and fitted with an outer diameter. A 16mm long glass tube 8 is permanently cured using a UV adhesive, such as... Figure 1 .

[0038] The two polarizing films 5 can be omitted to achieve polarization-maintaining biaxial optical transmission performance. The optical axes of the two polarizing films 5 are aligned with the slow axis of the polarization-maintaining fiber, achieving slow-axis optical transmission and fast-axis cutoff. Alternatively, the optical axes of the two polarizing films 5 can be aligned with the fast axis of the polarization-maintaining fiber, achieving fast-axis optical transmission and slow-axis cutoff.

[0039] This invention can be applied to a 1550nm 50 / 50TAP 1×2 polarization-maintaining fiber coupler. Its main optical parameters meet the following requirements: ; This invention designs a miniaturized 1×2 polarization-maintaining fiber coupler, which has a 1×2 structure and is miniaturized overall. It can be packaged in a 2.5×16mm glass tube. This invention has a cleverly designed polarization film (7), which saves space and has the function of selecting the working axis of polarized light in polarization performance, increasing the selectivity of the polarization state direction of the device. The optical fiber can be a polarization-maintaining fiber, which has the ability to maintain the polarization state of light. The TAP filter can have a variety of splitting ratios.

[0040] This invention utilizes a TAP filter for beam splitting. It achieves higher splitting accuracy and can accommodate any splitting ratio. The invention also employs a polarizing film to allow selection of the working axis of the polarized light, enabling either slow-axis passage or fast-axis cutoff. The TAP filter is fixed by attaching it to a second glass tube, further optimizing overall optical performance. Finally, the polarizing film is attached to a fiber optic pigtail, resulting in a more compact and miniaturized device.

[0041] For the specific implementation scheme of this embodiment, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0042] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0043] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means at least two.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] This invention relates to a miniaturized 1×2 polarization-maintaining fiber coupler device, which offers cost savings, low loss, strong polarization-maintaining functionality (achieving slow-axis pass-through and fast-axis cut-off), and compact size. It utilizes a symmetrical Clens structure and a polarization film to reduce cost and loss while maintaining high polarization-maintaining optical performance. It can be widely used in optical network systems, multi-channel optical signal monitoring, optical switching connection systems, fiber optic debugging and measurement systems, and other fields.

[0046] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. A miniaturized 1×2 polarization-maintaining fiber coupler device, characterized in that, The device includes a dual-fiber collimator, a single-fiber collimator, and a third glass tube. The third glass tube is sleeved around the dual-fiber collimator and the single-fiber collimator. The dual-fiber collimator and the single-fiber collimator are respectively located at both ends of the third glass tube. The outer ends of the dual-fiber collimator and the single-fiber collimator are encapsulated and cured with ultraviolet glue.

2. The miniaturized 1×2 polarization-maintaining fiber coupler device according to claim 1, characterized in that, The dual-fiber collimator includes a dual-fiber pigtail (1), a plano-convex lens (3), a first glass tube (6), a second glass tube (7), a polarizing film (5), and a TAP filter (4). The end face of the dual-fiber pigtail (1) is polished at an angle of 8 degrees and coated with a corresponding anti-reflection coating. The end face of the plano-convex lens (3) is polished at an angle of 8 ± 0.3 degrees and coated with a corresponding anti-reflection coating. The other end face is spherical. The dual-fiber pigtail (1) and the plano-convex lens (3) are fixed by the first glass tube (6). The second glass tube (7) is fitted onto the plano-convex lens (3). The TAP filter (4) is attached to the other end face of the second glass tube (7).

3. The miniaturized 1×2 polarization-maintaining fiber coupler device according to claim 2, characterized in that, The dual-fiber collimator further includes a polarizing film (5), and the dual-fiber pigtail (1) includes a first fiber and a second fiber, with the polarizing film (5) attached to the second fiber.

4. The miniaturized 1×2 polarization-maintaining fiber coupler device according to claim 1, characterized in that, The single-fiber collimator includes a single-fiber pigtail (2), a plano-convex lens (3), a polarizing film (5), and a first glass tube (6). The end face of the single-fiber pigtail (2) is polished at an angle of 8 degrees and coated with a corresponding anti-reflection film. One end face of the plano-convex lens (3) is polished at an angle of 8 ± 0.3 degrees and coated with a corresponding anti-reflection film, while the other end face is spherical. The single-fiber pigtail (2) and the plano-convex lens (3) are fixed by the first glass tube (6).

5. The miniaturized 1×2 polarization-maintaining fiber coupler device according to claim 4, characterized in that, The single-fiber collimator further includes a polarizing film (5), and the single-fiber pigtail (2) includes a third fiber. The polarizing film (5) is attached to the third fiber of the single-fiber pigtail (2).

6. The miniaturized 1×2 polarization-maintaining fiber coupler device according to claim 4, characterized in that, The single fiber pigtail (2) and plano lens (3) are assembled with the first glass tube (6) by curing with epoxy resin.

7. The miniaturized 1×2 polarization-maintaining fiber coupler device according to claim 2, characterized in that, The diameter of the dual fiber optic pigtail (1) is 1.8 mm and the length is 3.0-3.5 mm. The outer diameter of the first glass tube (6) is 2.2 mm and the length is 6 mm. The outer diameter of the second glass tube (7) is 2.1 mm and the length is 2 mm. The radius of curvature of the spherical end face of the plano-convex lens (3) is 1.419 and the center length is 2.73 mm.

8. The miniaturized 1×2 polarization-maintaining fiber coupler device according to claim 4, characterized in that, The single fiber pigtail (2) has a diameter of 1.8 mm and a length of 3.0 to 3.5 mm. The third glass tube (8) has an outer diameter of 2.4 mm and a length of 16 mm. The plano-convex lens (3) has a spherical end face with a radius of curvature of 1.419 and a center length of 2.73 mm.

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