Isolator

Abstract

The utility model relates to the technical field of free space isolators, in particular to an isolator. The isolator comprises a polarizer, a first polarization analyzer and a Faraday sheet group, the first polarization analyzer is positioned on one side of the light emitting direction of the polarizer; the Faraday sheet group is clamped between the polarizer and the polarization analyzer; the Faraday piece set comprises at least two Faraday pieces, and the multiple Faraday pieces are arranged in the light emitting direction of the polarizer. According to the isolator, the high-wavelength isolation requirement can be met, and the manufacturing difficulty is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to free space isolator technical field, especially an isolator. BACKGROUND

[0002] Free space isolator (Free space isolator) is a kind of optical passive device, is widely used in optical communication and laser field, its function is to ensure the one-way transmission of optical signal, prevent reflected light from causing interference to system, and its working principle is based on the magneto-optic effect of Faraday rotaor (Faraday rotaor).

[0003] Commonly used wave band of free space isolator includes O band, E band, S band, C band and L band, and wavelength range is from 1260nm to 1650nm.Different wave band isolator needs different Faraday thickness.With the increase of wavelength, the required Faraday thickness also increases, and processing difficulty also improves.Therefore, it becomes more difficult to make high-wavelength isolator over 1650nm. SUMMARY

[0004] The technical problem to be solved by the embodiment of the utility model lies in providing an isolator to solve the problem of great difficulty in making high-wavelength isolator in the prior art.

[0005] The isolator provided by the embodiment of the utility model comprises:

[0006] A polarizer;

[0007] A first polarimeter;It is located on one side of the light emitting direction of the polarizer;

[0008] Faraday sheet group, it is clamped between the polarizer and the first polarimeter;The Faraday sheet group includes at least two Faraday sheets, and a plurality of Faraday sheets are arranged in the light emitting direction of the polarizer.

[0009] In an embodiment, the Faraday sheet is provided with 2, and in the light emitting direction of the polarizer, the rotation angle of two Faraday sheets is equal.

[0010] In an embodiment, the rotation angle of two Faraday sheets is 22.5 °.

[0011] In an embodiment, the Faraday sheet is provided with 3, and in the light emitting direction of the polarizer, the rotation angle of three Faraday sheets is equal.

[0012] In an embodiment, the rotation angle of three Faraday sheets is 15 °.

[0013] In an embodiment, the adjacent Faraday pieces are connected by adhesive.

[0014] In an embodiment, the adjacent Faraday pieces are connected by optical glue.

[0015] In an embodiment, the sum of the rotation angles of the Faraday pieces in the Faraday piece group is 45°.

[0016] In an embodiment, the Faraday piece group is provided in multiple groups, and the adjacent Faraday piece groups are clamped with a second polarizer between them.

[0017] In an embodiment, the Faraday piece group is provided in two groups, and the second polarizer is provided in one.

[0018] Compared with the prior art, the isolator provided in the embodiment of the present application meets the demand of high wavelength of the isolator, and the manufacturing difficulty is greatly reduced.

[0019] Specifically, in the light emitting direction of the polarizer, the Faraday piece group is located between the polarizer and the polarizer, so as to realize optical isolation; the Faraday piece group not only meets the demand of high wavelength of the isolator, and compared with using one Faraday piece to meet the demand of high wavelength, the Faraday piece group includes at least two Faraday pieces, by using at least two Faraday pieces to form a Faraday piece group, the thickness originally required can be dispersed to multiple Faraday pieces, so that each Faraday piece can be at a suitable thickness, effectively reducing the manufacturing difficulty and improving the yield of the high wavelength isolator. BRIEF DESCRIPTION OF DRAWINGS

[0020] The specific implementation of the present application will be further described in detail below with reference to the accompanying drawings and embodiments, and the drawings are as follows:

[0021] Figure 1 is a structure schematic diagram of a single-stage isolator provided in the embodiment one of the present application;

[0022] Figure 2 is a structure schematic diagram of a single-stage isolator provided in the embodiment two of the present application;

[0023] Figure 3 is a structure schematic diagram of a two-stage isolator provided in the embodiment of the present application.

[0024] The reference signs in the drawings are as follows:

[0025] 1000, isolator; 10, polarizer; 20, first polarizer; 30, Faraday piece group; 31, Faraday piece; 40, second polarizer. DETAILED DESCRIPTION

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0027] This utility model embodiment provides an isolator 1000, such as Figure 1 As shown, the isolator 1000 includes a polarizer 10, a first analyzer 20, and a Faraday plate group 30; the first analyzer 20 is located on one side of the polarizer 10 in the light-emitting direction; the Faraday plate group 30 is sandwiched between the polarizer 10 and the first analyzer 20; the Faraday plate group 30 includes at least two Faraday plates 31, and multiple Faraday plates 31 are arranged in the light-emitting direction of the polarizer 10. This application can solve the problems of difficult manufacturing and unstable performance of high-wavelength isolators 1000. The isolator 1000 of this application not only meets the requirements of high-wavelength isolation, but also greatly reduces the manufacturing difficulty.

[0028] Specifically, in the light-emitting direction of the polarizer 10, the Faraday plate group 30 is located between the polarizer 10 and the analyzer to achieve optical isolation. This Faraday plate group 30 not only meets the high wavelength requirements of the isolator 1000, but also, compared to using a single Faraday plate 31 to meet the high wavelength requirements, this Faraday plate group 30 includes at least two Faraday plates 31. By using at least two Faraday plate groups 30 to form a Faraday plate group 30, the originally required thickness can be distributed across multiple Faraday plates 31, thereby ensuring that each Faraday plate 31 is at a suitable thickness. This effectively reduces the difficulty of its processing and manufacturing, improves the yield of the high-wavelength isolator 1000, and guarantees the isolation performance.

[0029] It should be noted that the free-space isolator 1000 commonly used in the market covers O-band, E-band, S-band, C-band and L-band, and the wavelength range is between 1260 nm and 1650 nm. The thickness of the Faraday sheet 31 used by devices of different bands is different; specifically, according to the Faraday effect, the longer the wavelength, the thicker the required Faraday sheet 31. With the increase of the thickness, the processing difficulty of the Faraday sheet 31 is increased accordingly. At present, the Faraday sheet 31 used by the free-space isolator 1000 mainly depends on suppliers in the United States, Japan and other countries, and domestic manufacturers start late in this field. For Faraday rotator sheets with a wavelength of more than 1650 nm, domestic manufacturers face challenges such as long growth cycle and low yield in material crystal growth, which makes the production of high-wavelength isolators 1000 difficult. However, with the rapid development of communication and sensing technology, the demand for free-space isolators 1000 with a wavelength of more than 1650 nm is increasing. The isolator 1000 involved in the present application can effectively solve the problems of difficult manufacturing, low yield and unstable performance of high-wavelength isolators 1000. Therefore, the isolator 1000 has great market demand, and has good development space and potential.

[0030] In order to better understand the present application, the following is an explanation of the working principle of realizing optical isolation: the input light is incident to the polarizer 10, which can adjust the polarization direction of the input light to be consistent with the polarization direction of itself. Then the light passes through the Faraday sheet group 30, which changes the polarization direction of the light again and is incident into the first polarizer 20, which ensures that only the light consistent with the direction of itself passes and is emitted to the outside, while the reverse light is blocked by the first polarizer 20, thereby achieving the isolation effect of the light.

[0031] In the present application, the rotation angle of the Faraday sheet group 30 can be freely adjusted according to the isolation requirement of the isolator 1000, which is not limited here. Preferably, the sum of the rotation angles of each Faraday sheet 31 in the Faraday sheet group 30 is 45°. In this way, when the rotation angle of the Faraday sheet group 30 is set to 45°, the maximum extinction effect can be achieved, and at this angle, the Faraday sheet group 30 can reduce or eliminate the polarized light in a specific direction to the greatest extent, thereby improving the overall performance of the isolator 1000.

[0032] The Faraday sheet group 30 includes a plurality of Faraday sheets 31, and the number of Faraday sheets 31 can be adjusted according to design requirements, which is not limited here. It can be understood that the rotation angles of the plurality of Faraday sheets 31 can be equal or unequal, and a person skilled in the art can adjust them according to design requirements, which is not limited here. For example, the rotation angle of the Faraday sheet group 30 is 45°, the Faraday sheet 31 is provided with 4, and the sum of the rotation angles of each Faraday sheet 31 only needs to satisfy 45°.

[0033] In order to facilitate the manufacturing of the Faraday sheet group 30, reduce the production cost, and be suitable for mass production, in the present application, the rotation angles of each Faraday sheet 31 in the Faraday sheet group 30 are equal, that is, the thicknesses of the Faraday sheets 31 are equal. In order to better understand the technical effects described above, the following describes multiple embodiments of the Faraday sheet group 30 with a rotation angle of 45 degrees.

[0034] Referring to Figure 1 In example one, the Faraday sheet 31 is provided with two, and the rotation angles of the two Faraday sheets 31 in the light-out direction of the polarizer 10 are equal. Specifically, the rotation angles of the two Faraday sheets 31 are both 22.5°. Referring to Figure 2 In example two, the Faraday sheet 31 is provided with three, and the rotation angles of the three Faraday sheets 31 in the light-out direction of the polarizer 10 are equal. Specifically, the rotation angles of the three Faraday sheets 31 are all 15°. In this way, the equal rotation angles of each Faraday sheet 31, that is, the equal thicknesses of each Faraday sheet 31, only need to produce and manufacture Faraday sheets 31 of the same specification in the production process, without the need to make Faraday sheets 31 of different specifications, simplifying the production process, reducing the adjustment and conversion time of the production line, improving the production efficiency, and being more suitable for large-scale production. Moreover, since the multiple Faraday sheets 31 all belong to the same specification, when the operator assembles the Faraday sheet group 30, the problem of misassembly can be effectively prevented.

[0035] In an embodiment, the adjacent Faraday sheets 31 are adhesively connected. In this way, the adhesive connection can ensure the connection stability between each Faraday sheet 31, and it is also more convenient and fast to combine together. Compared with other connection methods such as clamping connection or threaded connection, the process of adhesive connection is simpler and faster, and the assembly is more efficient.

[0036] Specifically, the adjacent Faraday sheets 31 are connected by optical glue. On the one hand, the optical glue has good optical performance, which helps to reduce the reflection and scattering between optical elements and ensure the one-way transmission of optical signals; on the other hand, the optical glue can fill the gap between the adjacent Faraday sheets 31, avoiding the optical performance decline caused by the small gap or irregular surface.

[0037] Similarly, the first polarizer 20 and the adjacent Faraday sheet 31 are adhesively connected, and the polarizer 10 and the adjacent Faraday sheet 31 are adhesively connected. In this way, the polarizer 10, the first polarizer 20, and the Faraday sheet group 30 can be firmly connected, avoiding the relative position deviation of the three, leading to the decline of the isolation performance, and improving the stability and reliability of the isolator 1000 performance.

[0038] Referring to Figure 3In an embodiment, the isolator 1000 further comprises a second polarizer 40, and the Faraday sheet group 30 is provided in multiple groups, and the multiple groups of Faraday sheet group 30 are located between the polarizer 10 and the first polarizer 20, and a second polarizer 40 is arranged between adjacent Faraday sheet groups 30. In this way, by adding the second polarizer 40, the influence of the reflected light can be further reduced, thereby improving the isolation of the isolator 1000 and reducing the reflectivity thereof, and ensuring the one-way transmission of the optical signal.

[0039] The number of Faraday sheet groups 30 and second polarizers 40 can be freely adjusted according to the specific application requirements and the requirements for isolation performance, and is not limited herein. Exemplarily, in the present application, the Faraday sheet group 30 is provided in two groups, and the second polarizer 40 is provided in one, and in the light output direction of the polarizer 10, the two groups of Faraday sheet group 30 are located between the polarizer 10 and the first polarizer 20, and the second polarizer 40 is arranged between adjacent Faraday sheet groups 30. In this way, the isolator 1000 can perform optical isolation twice, i.e., the isolator 1000 is a two-stage isolator 1000, which has a higher isolation and a lower reflectivity.

[0040] It can be understood that the second polarizer 40 is consistent with the first polarizer 20 to prevent the operator from confusing the installation position during assembly, avoid incorrect assembly, and improve the accuracy of installation.

[0041] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. For those skilled in the art, the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced by equivalents; all these modifications and replacements should belong to the protection scope of the appended claims of the present application.

Claims

1. An isolator characterized by, Comprise: a polarizer; a first polarimeter; its one side in the light emitting direction of the polarizer; a Faraday sheet group, which is sandwiched between the polarizer and the first polarimeter; the Faraday sheet group comprises at least two Faraday sheets, and a plurality of Faraday sheets are arranged in the light emitting direction of the polarizer; wherein the adjacent Faraday sheets are adhesively connected, and the first polarimeter and the adjacent Faraday sheet are adhesively connected, and the polarizer and the adjacent Faraday sheet are adhesively connected.

2. The isolator of claim 1, wherein The Faraday sheet is provided with 2, in the light emitting direction of the polarizer, the rotation angle of 2 Faraday sheets is equal.

3. The isolator of claim 2, wherein, The rotation angle of 2 Faraday sheets is 22.5°.

4. The isolator of claim 1, wherein, The Faraday sheet is provided with 3, in the light emitting direction of the polarizer, the rotation angle of 3 Faraday sheets is equal.

5. The isolator of claim 4, wherein, The rotation angle of 3 Faraday sheets is 15°.

6. The isolator of claim 1, wherein, The adjacent Faraday sheets are connected by optical glue.

7. The isolator of claim 2 or 4, wherein, The sum of the rotation angles of each Faraday sheet in the Faraday sheet group is 45°.

8. The isolator of any one of claims 1-6, wherein, The Faraday sheet group is provided with a plurality of groups, and a plurality of Faraday sheet groups are arranged between the polarizer and the first polarimeter, and a second polarimeter is sandwiched between adjacent Faraday sheet groups.

9. The isolator of claim 8, wherein, The Faraday sheet group is provided with 2 groups, and the second polarimeter is provided with 1.

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