Miniaturized full-wave optical fiber isolator device

Abstract

The utility model relates to a miniaturized full-wave optical fiber isolator device which comprises miniaturized double-optical-fiber collimators, miniaturized isolator core pieces and an external glass tube, and the two miniaturized double-optical-fiber collimators and the miniaturized isolator core pieces are installed inside the external glass tube. And the miniaturized isolator core piece is arranged between the two miniaturized double-fiber collimators. The miniaturized full-wave optical fiber isolator device provided by the utility model has the advantages of high coaxiality, excellent linearity and convenience in compression of space size. The isolation degree is high, return loss is high, and application requirements are met. The coupler is convenient to manufacture and produce, saves materials, reduces cost, and is good in symmetry, high in coupling efficiency and small in loss. The optical fiber connector is simple in structure, high in integration level, high in symmetry requirement, easy to assemble and small in size, and can be widely applied to the field of optical fiber communication.

Description

Technical Field

[0001] The utility model relates to the field of optical path devices, in particular to the field of miniaturized full-wave optical fiber isolators, and specifically refers to a miniaturized full-wave optical fiber isolator device. Background Art

[0002] Currently, the wavelength window of multi-port optical fiber isolators is relatively single, the bandwidth is relatively small, the size is large, the loss is large, and the manufacturing is slow. Usually, the lens is highly sensitive to the working distance, the reliability is low, it is difficult to pass the strict environmental reliability test, and it is difficult to operate. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide a miniaturized full-wave optical fiber isolator device which has higher reliability, is easy to manufacture, convenient to use, easy to operate, and has a wider range of applications.

[0004] In order to achieve the above-mentioned purpose, the miniaturized full-wave optical fiber isolator device of the utility model is as follows:

[0005] The miniaturized full-wave optical fiber isolator device has the following main features: the device comprises a miniaturized dual-fiber collimator, a miniaturized isolator core and an external glass tube; two miniaturized dual-fiber collimators and the miniaturized isolator core are installed inside the external glass tube; and the miniaturized isolator core is installed between the two miniaturized dual-fiber collimators;

[0006] The miniaturized dual-fiber collimator comprises a dual-fiber pigtail, a plano-convex lens and a first glass tube, wherein one end of the dual-fiber pigtail is a polished surface with a polishing angle of 10 degrees and coated with an anti-reflection film layer, one side of the plano-convex lens is a plane and the other side is a spherical surface, both sides of the plano-convex lens have 0-degree polishing and are coated with corresponding full-wave anti-reflection film layers, the polished surface of the dual-fiber pigtail is connected to the plano-convex lens, and the dual-fiber pigtail and the plano-convex lens are fixed in the first glass tube.

[0007] Preferably, the miniaturized isolator core comprises two Faraday rotators of different light wavelengths, four lithium niobate crystal wedges and a miniaturized magnetic ring. Two lithium niobate wedges are installed on both sides of one Faraday rotator to form a miniaturized chip. Two groups of miniaturized chips are placed and fixed at 45 degrees relative to each other, and the two groups of fixed miniaturized chips are installed in the miniaturized magnetic ring.

[0008] Preferably, both sides of the Faraday rotator are plated with air anti-reflection film layers, and both sides of the lithium niobate crystal wedge-angle plate are plated with air anti-reflection film layers.

[0009] Preferably, a miniaturized isolator core is pasted inside the outer glass tube and fixed in the center.

[0010] Preferably, the diameter of the dual-fiber pigtail is 1.0nm, the light wavelength range of the anti-reflection film layer of the dual-fiber pigtail is 1200-1700nm, and the reflectivity is <0.2%; the diameter of the plano-convex lens is 1.0nm, the radius of curvature is 0.6mm, and the length is 1.2mm. The reflectivity of the full-wave anti-reflection film layer of the plano-convex lens is <0.2%; the diameter of the first glass tube is 1.4nm and the length is 6mm.

[0011] Preferably, the thicknesses of the two different Faraday rotators have light wavelengths of 1350 nm and 1530 nm respectively, the wavelength range of the air anti-reflection film layer of the Faraday rotator is 1200-1700 nm, the reflectivity is <0.2%, and the rotation angle is 45 degrees; the material of the lithium niobate crystal wedge-angle plate is lithium niobate, the optical axis angle is 22.5 degrees, the wedge angle polishing angle is 13 degrees, the wavelength range of the air anti-reflection film layer of the lithium niobate crystal wedge-angle plate is 1200-1700 nm, and the reflectivity of the air anti-reflection film layer of the lithium niobate crystal wedge-angle plate is <0.2%.

[0012] Preferably, the outer glass tube has a diameter of 2.3 mm and a length of 13 mm; the first glass tube has a diameter of 1.2 mm and a length of 6 mm.

[0013] The miniaturized full-wave optical fiber isolator device of the utility model is adopted, and the bandwidth range of the working wavelength can cover the full wave of 1200-1700nm. The wavelength combination can be carried out through two different chips to adjust the required full-wave band; it has high coaxiality and excellent linearity, which is convenient for compressing the space size. The isolation is high and the return loss is high to meet the application requirements. It is easy to make and easy to produce, saves materials, reduces costs, has good symmetry, high coupling efficiency and low loss. It has high integration and strong symmetry requirements. Through the use of plano-convex lenses, the sensitivity of the two-way transmission coupling loss to the working distance is reduced, the coupling efficiency is enhanced, and the loss is reduced. Through two different core parts, the selection range of the full-wave band is expanded and more personalized. At the same time, it meets the simple assembly and small size, and can be widely used in the field of optical fiber communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1a It is a schematic diagram of the decomposition of the miniaturized dual-fiber collimator of the miniaturized full-wave fiber isolator device of the utility model.

[0015] Figure 1b It is an overall schematic diagram of a miniaturized dual-fiber collimator of a miniaturized full-wave fiber isolator device of the utility model.

[0016] Figure 2a It is a schematic diagram of the exploded view of the miniaturized isolator core of the miniaturized full-wave optical fiber isolator device of the present utility model.

[0017] Figure 2b It is an overall schematic diagram of the miniaturized isolator core component of the miniaturized full-wave optical fiber isolator device of the utility model.

[0018] Figure 3 It is a schematic diagram of the packaging structure of the miniaturized full-wave optical fiber isolator device of the utility model.

[0019] Reference numerals:

[0020] 1 Dual fiber pigtail

[0021] 2 Plano-convex lens

[0022] 3. The first glass tube

[0023] 4 Miniaturized magnetic ring

[0024] 5 Faraday Rotator

[0025] 6 Lithium Niobate Crystal Wedge

[0026] 7 External glass tube DETAILED DESCRIPTION

[0027] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0028] The miniaturized full-wave optical fiber isolator device of the utility model comprises a miniaturized dual-fiber collimator, a miniaturized isolator core and an external glass tube, two of the miniaturized dual-fiber collimators and the miniaturized isolator core are installed inside the external glass tube, and the miniaturized isolator core is installed between the two miniaturized dual-fiber collimators;

[0029] The miniaturized dual-fiber collimator comprises a dual-fiber pigtail, a plano-convex lens and a first glass tube, wherein one end of the dual-fiber pigtail is a polished surface with a polishing angle of 10 degrees and coated with an anti-reflection film layer, one side of the plano-convex lens is a plane and the other side is a spherical surface, both sides of the plano-convex lens have 0-degree polishing and are coated with corresponding full-wave anti-reflection film layers, the polished surface of the dual-fiber pigtail is connected to the plano-convex lens, and the dual-fiber pigtail and the plano-convex lens are fixed in the first glass tube.

[0030] As a preferred embodiment of the utility model, the miniaturized isolator core comprises two Faraday rotators of different light wavelengths, four lithium niobate crystal wedges and a miniaturized magnetic ring. Two lithium niobate wedges are installed on both sides of one Faraday rotator to form a miniaturized chip. Two groups of the miniaturized chips are placed and fixed at 45 degrees relative to each other, and the two groups of fixed miniaturized chips are installed in the miniaturized magnetic ring.

[0031] As a preferred embodiment of the utility model, both sides of the Faraday rotator are plated with air anti-reflection film layers, and both sides of the lithium niobate crystal wedge-angle plate are plated with air anti-reflection film layers.

[0032] As a preferred embodiment of the utility model, a miniaturized isolator core is pasted inside the outer glass tube and fixed in the center.

[0033] As a preferred embodiment of the utility model, the diameter of the dual-fiber pigtail is 1.0nm, the light wavelength range of the anti-reflection film layer of the dual-fiber pigtail is 1200-1700nm, and the reflectivity is <0.2%; the diameter of the plano-convex lens is 1.0nm, the radius of curvature is 0.6mm, and the length is 1.2mm. The reflectivity of the full-wave anti-reflection film layer of the plano-convex lens is <0.2%; the diameter of the first glass tube is 1.4nm and the length is 6mm.

[0034] As a preferred embodiment of the utility model, the light wavelengths of the two different Faraday rotators are 1350nm and 1530nm respectively, the wavelength range of the air anti-reflection film layer of the Faraday rotator is 1200-1700nm, the reflectivity is <0.2%, and the rotation angle is 45 degrees; the material of the lithium niobate crystal wedge-angle plate is lithium niobate, the optical axis angle is 22.5 degrees, the wedge angle polishing angle is 13 degrees, the light wavelength range of the air anti-reflection film layer of the lithium niobate crystal wedge-angle plate is 1200-1700nm, and the reflectivity of the air anti-reflection film layer of the lithium niobate crystal wedge-angle plate is <0.2%.

[0035] As a preferred embodiment of the present invention, the diameter of the outer glass tube is 2.3 mm and the length is 13 mm; the diameter of the first glass tube is 1.2 mm and the length is 6 mm.

[0036] In the specific implementation of the utility model, the technical problem to be solved by the utility model is to overcome the shortcomings and deficiencies of the prior art and provide a 2×2 miniaturized full-wave optical fiber isolator; the two ends are miniaturized dual-fiber collimators, and the middle is a miniaturized isolator core, such as Figure 3 shown.

[0037] The utility model discloses a 2×2 miniaturized full-wave optical fiber isolator, both ends of which are miniaturized dual-fiber collimators; the utility model comprises:

[0038] Dual fiber pigtail (1), one The double optical fiber pigtail (1) has an end surface polishing angle of 10 degrees and is coated with a 1200-1700nm anti-reflection film layer with a reflectivity of less than 0.2%.

[0039] Plano-convex Clens (2), with a curvature radius of 0.6 mm and a length of 1.2 mm, one side is spherical and the other side is flat, both sides are polished to 0 degrees and coated with the corresponding full-wave anti-reflection film.

[0040] Use one The glass tube (4) will Dual Fiber Pigtail (1) and The plano-convex Clens (2) are assembled and fixed by epoxy resin glue. During debugging, the transmission coupling loss of 1200-1700nm must be <0.2dB.

[0041] A miniaturized isolator core contains two different chips; the wavelength combination can be performed through the two different chips to adjust the required full-wave band; for example, the core contains a Faraday rotator with a wavelength of 1350nm, a Faraday rotator with a wavelength of 1530nm, four lithium niobate crystal wedges and a miniaturized magnetic ring. Here, 1350nm and 1530nm refer to the optical wavelength parameters.

[0042] Both sides of the Faraday rotator need to be coated with an air anti-reflection film, a 1200-1700nm full-wave film, a reflectivity of <0.2%, and a rotation angle of 45 degrees. The size is 0.6×0.6×0.4mm.

[0043] Lithium niobate crystal wedge, made of lithium niobate, optical axis angle 22.5 degrees, wedge polishing angle 13 degrees. Size 0.6×0.6×0.2mm. Both sides are coated with air anti-reflection film, 1200~1700nm full-wave film, reflectivity <0.2%.

[0044] A miniaturized magnetic ring, with an outer diameter of 1.55 mm, an inner diameter of 0.8 mm, and a thickness of 2.2 mm. A Faraday rotator is provided with lithium niobate wedges on both sides to form a miniaturized chip, which is made into two groups, placed at 45 degrees relative to each other and fixed, and then placed in the miniaturized magnetic ring.

[0045] A miniaturized isolator core is pasted onto the glass tube (7) and fixed in the center.

[0046] The utility model reduces the sensitivity of the lens to the working distance by using a specially designed plano-convex lens, and at the same time compresses the light spot, thereby compressing the overall package size of the 2×2 isolator. The miniaturized full-wave fiber isolator can be used in optical path devices with a wide range of band requirements, small space requirements, and high integration, such as optical fiber amplifiers, CATV optical path connections, telecommunications, and optical fiber passive and active chassis or modules. It can be widely used in optical network devices, multi-channel optical signal monitoring, optical switching connection devices, optical fiber debugging and measurement devices, and other fields.

[0047] The specific implementation scheme of this embodiment can refer to the relevant description in the above embodiment, which will not be repeated here.

[0048] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0049] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] The miniaturized full-wave optical fiber isolator device of the utility model is adopted, and the bandwidth range of the working wavelength can cover the full wave of 1200-1700nm. The wavelength combination can be carried out through two different chips to adjust the required full-wave band; it has high coaxiality and excellent linearity, which is convenient for compressing the space size. The isolation is high and the return loss is high to meet the application requirements. It is easy to make and easy to produce, saves materials, reduces costs, has good symmetry, high coupling efficiency and low loss. It has high integration and strong symmetry requirements. Through the use of plano-convex lenses, the sensitivity of the two-way transmission coupling loss to the working distance is reduced, the coupling efficiency is enhanced, and the loss is reduced. Through two different core parts, the selection range of the full-wave band is expanded and more personalized. At the same time, it meets the simple assembly and small size, and can be widely used in the field of optical fiber communication.

[0052] In this specification, the utility model has been described with reference to its specific embodiments. However, it is obvious that various modifications and changes can be made without departing from the spirit and scope of the utility model. Therefore, the description and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A miniaturized full-wave optical fiber isolator device, characterized in that: The device comprises a miniaturized dual-fiber collimator, a miniaturized isolator core and an external glass tube, two of the miniaturized dual-fiber collimators and the miniaturized isolator core are installed inside the external glass tube, and the miniaturized isolator core is installed between the two miniaturized dual-fiber collimators; The miniaturized dual-fiber collimator comprises a dual-fiber pigtail, a plano-convex lens and a first glass tube, wherein one end of the dual-fiber pigtail is a polished surface with a polishing angle of 10 degrees and coated with an anti-reflection film layer, one side of the plano-convex lens is a plane and the other side is a spherical surface, both sides of the plano-convex lens have 0-degree polishing and are coated with corresponding full-wave anti-reflection film layers, the polished surface of the dual-fiber pigtail is connected to the plano-convex lens, and the dual-fiber pigtail and the plano-convex lens are fixed in the first glass tube.

2. The miniaturized full-wave optical fiber isolator device according to claim 1, characterized in that: The miniaturized isolator core comprises two Faraday rotators of different light wavelengths, four lithium niobate crystal wedges and a miniaturized magnetic ring. Two lithium niobate wedges are installed on both sides of one Faraday rotator to form a miniaturized chip. Two groups of miniaturized chips are placed and fixed at 45 degrees relative to each other, and the two groups of fixed miniaturized chips are installed in the miniaturized magnetic ring.

3. The miniaturized full-wave optical fiber isolator device according to claim 2, characterized in that: The two sides of the Faraday rotator are plated with air anti-reflection film layers, and the two sides of the lithium niobate crystal wedge-angle plate are plated with air anti-reflection film layers.

4. The miniaturized full-wave optical fiber isolator device according to claim 1, characterized in that: A miniaturized isolator core is pasted inside the outer glass tube and fixed in the center.

5. The miniaturized full-wave optical fiber isolator device according to claim 1, characterized in that: The diameter of the dual-fiber pigtail is 1.0nm, the light wavelength range of the anti-reflection film layer of the dual-fiber pigtail is 1200-1700nm, and the reflectivity is <0.2%; the diameter of the plano-convex lens is 1.0nm, the radius of curvature is 0.6mm, and the length is 1.2mm. The reflectivity of the full-wave anti-reflection film layer of the plano-convex lens is <0.2%; the diameter of the first glass tube is 1.4nm and the length is 6mm.

6. The miniaturized full-wave optical fiber isolator device according to claim 2, characterized in that: The light wavelengths of the two different Faraday rotators are 1350nm and 1530nm respectively, the wavelength range of the air anti-reflection film layer of the Faraday rotator is 1200-1700nm, the reflectivity is less than 0.2%, and the rotation angle is 45 degrees; the material of the lithium niobate crystal wedge-angle plate is lithium niobate, the optical axis angle is 22.5 degrees, the wedge angle polishing angle is 13 degrees, the light wavelength range of the air anti-reflection film layer of the lithium niobate crystal wedge-angle plate is 1200-1700nm, and the reflectivity of the air anti-reflection film layer of the lithium niobate crystal wedge-angle plate is less than 0.2%.

7. The miniaturized full-wave optical fiber isolator device according to claim 1, characterized in that: The outer glass tube has a diameter of 2.3 mm and a length of 13 mm; the first glass tube has a diameter of 1.2 mm and a length of 6 mm.

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