Polarization maintaining optical fiber and optical module thereof
By employing a design that incorporates fiber body, ferrule, and glass sheet in polarization-maintaining fiber, the problem of fiber end face cracking in high temperature and high humidity environments has been solved, achieving higher reliability and stability while reducing production costs.
Patent Information
- Application Number
- CN202423297190.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing polarization-maintaining optical fibers are prone to cracks at the fiber end face in high temperature and high humidity environments. Conventional coatings have limited improvement effects and cannot meet product reliability requirements.
Design a polarization-maintaining fiber structure, including an optical fiber body, a ferrule, a metal component, and a glass sheet. The end face of the optical fiber body is covered by the glass sheet. The ferrule is coaxial with the metal component. The optical fiber body is inserted into the ferrule and fixed by an adhesive layer. The glass sheet provides additional protection.
It effectively protects the fiber end face from external environmental influences, extends service life and stability, reduces production costs, improves mechanical protection, and meets product reliability requirements.
Smart Images
Figure CN223565925U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to optical communication technical field especially a kind of polarization maintaining optical fiber and its optical module. BACKGROUND
[0002] Polarization maintaining optical fiber is used to keep the polarization state of optical signal, in ordinary optical fiber, the polarization state of optical signal can be influenced by the asymmetry of optical fiber structure or external environment, which will lead to the distortion and loss of optical signal, and polarization maintaining optical fiber makes the refractive index of fiber core asymmetric by applying asymmetric stress outside fiber core, to keep the polarization state of optical signal;In the application of polarization maintaining optical fiber, the end face of optical fiber is exposed to the environment and lacks protection, and under the influence of high temperature and humidity environment, the end face is prone to crack, which is difficult to meet the requirements of product reliability, and the conventional improvement method is to coat the surface of optical fiber end face, but the coating cannot be completely dense, so the improvement effect is effective, and the reliability problem cannot be completely solved.
[0003] Therefore, it is essential for those skilled in the art to design a polarization maintaining optical fiber and its optical module that can effectively seal the end face of optical fiber and meet the requirements of product reliability. SUMMARY
[0004] The technical problem to be solved by the embodiments of the utility model is to provide a polarization maintaining optical fiber and its optical module that can effectively seal the end face of optical fiber and meet the requirements of product reliability, to solve the problem of effective improvement in the prior art.
[0005] The utility model discloses a polarization maintaining optical fiber, and the scheme is that, comprising: optical fiber body, plug core, metal piece and glass flake, the plug core is arranged in the metal piece, and the outer diameter of the plug core is coaxial with the outer diameter of the metal piece, the first end of the optical fiber body is inserted into the plug core and makes the end face of the first end flush with the end face of the plug core, the second end of the optical fiber body is exposed outside the plug core and the metal piece, and the glass flake is attached and covers the end face of the first end of the optical fiber body.
[0006] Optionally, a first adhesive layer is arranged between the first end of the optical fiber body and the plug core.
[0007] Optionally, the plug core and the metal piece are arranged in interference fit.
[0008] Optionally, a second adhesive layer is arranged between the glass flake and the end face of the first end of the optical fiber body.
[0009] Optionally, the plug core is LC ceramic plug core or SC ceramic plug core.
[0010] Optionally, the plug core is glass plug core or glass optical fiber array.
[0011] Optionally, the metal part includes a first mounting portion and a second mounting portion, the first mounting portion being used to accommodate the ferrule, and the second mounting portion being used to accommodate the optical fiber body; and the diameter of the first mounting portion is larger than the diameter of the first mounting portion.
[0012] Optionally, the polarization-maintaining fiber is a panda-type polarization-maintaining fiber, and the fiber body includes a core, an inner cladding, stress zones, and an outer cladding. The stress zones are symmetrically distributed on both sides of the core, and the inner cladding wraps around the stress zones.
[0013] Optionally, the glass sheet is square, and the diagonal distance of the glass sheet is greater than or equal to the diameter of the optical fiber end face and covers the stress zone.
[0014] To address the problems existing in the prior art, this utility model also provides an optical module, which includes a polarization-maintaining fiber and a housing as described above, wherein the polarization-maintaining fiber is disposed within the housing.
[0015] Compared with the prior art, the beneficial effects of the polarization-maintaining optical fiber provided by this utility model embodiment are as follows: By designing a polarization-maintaining optical fiber including: an optical fiber body, a ferrule, a metal part, and a glass sheet; the ferrule is disposed inside the metal part, and the outer diameter of the ferrule is coaxial with the outer diameter of the metal part; the first end of the optical fiber body is inserted into the ferrule, and the end face of the first end is flush with the end face of the ferrule; the second end of the optical fiber body is exposed outside the ferrule and the metal part; the glass sheet is attached to and covers the end face of the first end of the optical fiber body. By covering the end face of the optical fiber body with a layer of glass sheet, it can not only effectively protect the end face from the influence of the external environment, such as moisture, dust, chemicals, etc., which helps to extend the service life and stability of the product, but the glass sheet can also provide additional mechanical protection to protect the end face of the polarization-maintaining optical fiber from accidental collisions or damage; and, compared with coating, setting a glass sheet is easier to implement in the manufacturing process, which can effectively reduce production costs. Attached Figure Description
[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings:
[0017] Figure 1 This is a schematic diagram of the polarization-maintaining optical fiber provided in this embodiment of the utility model. Figure 1 ;
[0018] Figure 2 This is an overall schematic diagram of the polarization-maintaining optical fiber provided in this embodiment of the utility model;
[0019] Figure 3 This is a schematic diagram of the polarization-maintaining optical fiber provided in this embodiment of the utility model. Figure 2 .
[0020] The reference signs in the drawings are as follows:
[0021] 100, fiber body; 200, ferrule; 300, metal piece; 400, glass flake; 310, first mounting portion; 320, second mounting portion; 410, second adhesive layer. DETAILED DESCRIPTION
[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. Now, the preferred embodiments of the present application will be described in detail with reference to the drawings.
[0023] As Figures 1 to 3 indicated, the present application provides a specific embodiment of a polarization maintaining optical fiber.
[0024] A polarization maintaining optical fiber, referring to Figure 1 and Figure 2 , the polarization maintaining optical fiber comprises a fiber body 100, a ferrule 200, a metal piece 300, and a glass flake 400; the ferrule 200 is arranged in the metal piece 300, and the outer diameter of the ferrule 200 is coaxial with the outer diameter of the metal piece 300; a first end of the fiber body 100 is inserted into the ferrule 200 and the end face of the first end is flush with the end face of the ferrule 200; a second end of the fiber body 100 is exposed outside the ferrule 200 and the metal piece 300; and the glass flake 400 is attached to and covers the end face of the first end of the fiber body 100.
[0025] Specifically, referring to Figure 1 , the polarization maintaining optical fiber is used for maintaining the polarization state of an optical signal, and the polarization maintaining optical fiber is a panda-type polarization maintaining optical fiber; the fiber body 100 of the panda-type polarization maintaining optical fiber comprises a fiber core, an inner cladding layer, an outer cladding layer, and two stress regions; the two stress regions are symmetrically and separately distributed on two sides of the fiber core; the inner cladding layer is wrapped outside the stress regions; and the outer cladding layer is wrapped outside the fiber core and the inner cladding layer. Since the two stress regions are distributed on the two sides of the fiber core and present a black-and-white appearance together with the fiber core, similar to a panda eye, the panda-type polarization maintaining optical fiber is named as such.
[0026] In a common optical fiber, the polarization state of an optical signal may be affected by the asymmetry of the structure of the optical fiber or the influence of an external environment, which will lead to distortion and loss of the optical signal. The panda-type polarization maintaining optical fiber adopts a design of refractive index difference type, introduces a refractive index difference between the fiber core and the cladding layer to realize separation and transmission of different polarization state lights, can reduce cross-coupling between polarization modes of the optical fiber, and enables the optical signal to be transmitted in a specific polarization state.
[0027] A big problem in the application of panda polarization maintaining optical fiber is that the end face of the optical fiber is exposed to the environment and lacks protection. In the use process, it is easy to be affected by high temperature and humidity environment, and the cat eye cracking problem occurs, which is difficult to meet the reliability requirements of the product. In the prior art, the conventional improvement method is to coat an AR film on the surface of the optical fiber end face. The AR film is a coating material that can reduce light reflection to improve transmittance and can seal the optical fiber end face to some extent to protect the end face of the optical fiber body 100. However, since the coating film cannot be completely dense and cannot provide physical stress protection to the end face of the optical fiber body 100, the improvement effect is effective, and the reliability problem cannot be completely solved.
[0028] In the embodiment, a polarization maintaining optical fiber is designed to include an optical fiber body 100, a ferrule 200, a metal piece 300, and a glass sheet 400. The ferrule 200 is arranged in the metal piece 300, and the outer diameter of the ferrule 200 is coaxial with the outer diameter of the metal piece 300. The first end of the optical fiber body 100 is inserted into the ferrule 200, and the second end of the optical fiber body 100 is exposed outside the ferrule 200 and the metal piece 300. The glass sheet 400 is attached to and covers the end face of the first end of the optical fiber body 100. By covering the end face of the optical fiber body 100 with a layer of glass sheet 400, the end face can be effectively protected from external environmental factors such as moisture, dust, and chemicals, which helps to extend the service life and stability of the product. The glass sheet 400 also provides additional mechanical protection to protect the end face of the polarization maintaining optical fiber from accidental impact or damage. Compared with coating, the glass sheet 400 is easier to implement in the process manufacturing process, which can effectively reduce the production cost.
[0029] In one embodiment, referring to Figure 1 and Figure 2 , a first adhesive layer is arranged between the first end of the optical fiber body 100 and the ferrule 200, i.e. the first end of the optical fiber body 100 is inserted into the ferrule 200 and fixed by the first adhesive layer. Specifically, after the first end of the optical fiber body 100 is inserted into the ferrule 200, glue can be injected into the gap between the first end of the optical fiber body 100 and the ferrule 200 to fix and form the first adhesive layer.
[0030] In one embodiment, referring to Figure 1 and Figure 2 , the ferrule 200 and the metal piece 300 are arranged in interference fit. The interference fit can ensure that the metal piece 300 and the ferrule 200 are tightly connected during assembly, reducing the looseness or gap between them and improving the stability and tightness after assembly. Furthermore, the interference fit can help better transfer heat to improve the working stability of the optical fiber, and the interference fit can also achieve better sealing to improve the stability of the product.
[0031] In one of the embodiments, referring to Figure 2 and Figure 3 , the glass flake 400 is arranged with a second adhesive layer 410 between the end face of the first end of the optical fiber body 100, that is, the glass flake 400 is fixed on the end face of the first end of the optical fiber body 100 by the glue, and after the glue is cooled and fixed, the second adhesive layer 410 is formed.
[0032] In one of the embodiments, the ferrule 200 adopts an LC ceramic ferrule 200 or an SC ceramic ferrule 200; or a glass ferrule 200 or a glass fiber array, the ceramic ferrule 200 has relatively high hardness, wear resistance, and can maintain good connection performance for a long time, has good chemical stability, can resist corrosion and oxidation, has good high-temperature performance and high tensile strength, can withstand a certain tensile force, and improves the reliability of the connection; the glass ferrule 200 has relatively good optical transparency, can reduce the loss of optical signals, has lower insertion loss, helps to maintain the stability of the optical signals, has lower manufacturing cost, and is easy to process.
[0033] In one of the embodiments, referring to Figure 1 and Figure 2 , the metal piece 300 includes a first mounting portion 310 and a second mounting portion 320, the first mounting portion 310 is used for accommodating the mounting ferrule 200, and the second mounting portion 320 is used for accommodating the optical fiber body 100; and the diameter of the first mounting portion 310 is greater than the diameter of the first mounting portion 310, so that the two ends of the metal piece 300 are more fitted with the ferrule 200 and the optical fiber body 100, respectively.
[0034] In one of the embodiments, referring to Figure 2 and Figure 3 , the glass flake 400 is square, and the diagonal distance of the glass flake 400 is greater than or equal to the diameter of the fiber end face, so as to reduce the manufacturing cost while ensuring covering the stress area and the core end face.
[0035] The end face angle of the first end of the optical fiber body 100 can be 0°, 4°, 6°, or 8°.
[0036] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them, and those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent replacement for part of the technical features; all these modifications and replacements shall belong to the protection scope of the claims of the present application.
Claims
1. A polarization maintaining optical fiber, characterized by, The application relates to a polarization maintaining optical fiber, which comprises the following components: a fiber body, a ferrule, a metal piece and a glass sheet; the ferrule is arranged in the metal piece, the outer diameter of the ferrule is coaxial with the outer diameter of the metal piece, the first end of the fiber body is inserted into the ferrule and the end face of the first end is flush with the end face of the ferrule, the second end of the fiber body is exposed outside the ferrule and the metal piece, and the glass sheet is attached to and covers the end face of the first end of the fiber body. A first adhesive layer is arranged between the first end of the fiber body and the ferrule.
2. The polarization maintaining optical fiber according to claim 1, characterized in that, The ferrule is arranged in interference fit with the metal piece.
3. The polarization maintaining optical fiber according to claim 1, characterized in that, A second adhesive layer is arranged between the glass sheet and the end face of the first end of the fiber body.
4. The polarization maintaining optical fiber according to claim 1, characterized in that, The ferrule is an LC ceramic ferrule or an SC ceramic ferrule.
5. The polarization maintaining optical fiber according to claim 1, characterized in that, The ferrule is a glass ferrule or a glass fiber array.
6. The polarization maintaining optical fiber according to claim 1, characterized in that, The metal piece comprises a first mounting part and a second mounting part, the first mounting part is used for accommodating the ferrule, the second mounting part is used for accommodating the fiber body, the diameter of the first mounting part is greater than that of the second mounting part.
7. The polarization maintaining optical fiber according to claim 1, characterized in that, The polarization maintaining optical fiber is a panda type polarization maintaining optical fiber, the fiber body comprises a core, an inner cladding layer, stress regions and an outer cladding layer, the stress regions are symmetrically and spacedly arranged on both sides of the core, and the inner cladding layer is wrapped outside the stress regions.
8. The polarization maintaining optical fiber according to claim 7, characterized in that, The glass sheet is square, the diagonal distance of the glass sheet is greater than or equal to the diameter of the fiber end face and covers the stress regions.
9. The polarization maintaining optical fiber according to claim 8, characterized in that, The application further relates to a polarization maintaining optical fiber and a shell, the polarization maintaining optical fiber is arranged in the shell.
10. An optical module characterized by comprising: