Optical isolation assembly
By employing various adjustment methods for magneto-optical crystal components and optical rotation elements, the problems of single adjustment method, complex operation, and high cost of optical isolators have been solved, enabling flexible and convenient adjustment of the isolation center wavelength, and reducing manufacturing costs and space occupation.
Patent Information
- Application Number
- CN202520255340.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-02-17
AI Technical Summary
Existing optical isolators adjust the center wavelength of isolation through an electronically controlled coil, which has problems such as a single adjustment method, complex operation, large space occupation, and high manufacturing cost.
By employing a magneto-optical crystal assembly and an angle-adjustable optical rotator, the center wavelength of the isolation can be adjusted in multiple ways through the movement of the magneto-optical crystal relative to the magnet, the adjustment of the magnet's position, and the adjustment of the optical rotator's angle, thus avoiding the need for additional coils and external circuit systems.
It enables flexible adjustment of isolation center wavelength, simplifies operation, reduces space occupation and manufacturing costs, and is conducive to mass production.
Smart Images
Figure CN223770492U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of optical device technology, and specifically relates to an optical isolation component. Background Technology
[0002] An optical isolator is an optical device with non-reciprocal properties. Its main function is to allow light to travel in one direction while blocking light from traveling in the opposite direction, thereby reducing the adverse effects of reflected light on laser performance. During the operation of an optical isolator, the center wavelength of its isolation level often needs to be adjusted according to changes in the actual application scenario. Currently, the adjustment of the center wavelength of the isolation level in optical isolators is generally achieved through an electrically controlled coil. An external circuit system controls the coil to adjust the strength of the magnetic field, thereby adjusting the center wavelength of the isolation level. However, this method suffers from problems such as a single adjustment method, complex operation, large space occupation, and high manufacturing cost. Utility Model Content
[0003] The purpose of this application is to provide an optical isolation component that addresses the technical problems of existing optical isolators that adjust the center wavelength of isolation through an electronically controlled coil, which suffers from a single adjustment method, complex operation, large space occupation, and high manufacturing cost.
[0004] To achieve the above objectives, the technical solution adopted in this application is: an optical isolation component, including a magneto-optical crystal component and an angle-adjustable optical rotation element arranged at intervals along the light transmission direction. The magneto-optical crystal component includes a magneto-optical crystal and a plurality of magnets arranged around the magneto-optical crystal. The magneto-optical crystal can move relative to the magnets to adjust the magnetic induction intensity, and at least one magnet can move toward or away from the magneto-optical crystal to adjust the magnetic field strength.
[0005] Furthermore, the plurality of magnets includes a first magnet that repels other magnets, and the repulsive force between the first magnet and other magnets enables the first magnet to move away from the magneto-optical crystal; the optical isolation assembly also includes a first adjustment member for driving the first magnet to move closer to the magneto-optical crystal to reduce the distance between the first magnet and other magnets.
[0006] Furthermore, the first adjusting member abuts against the side of the first magnet facing away from the magneto-optical crystal; the optical isolation assembly also includes a mating member, the first adjusting member being threadedly connected to the mating member, and the first adjusting member being able to move towards and away from the magneto-optical crystal when rotating relative to the mating member.
[0007] Furthermore, the magneto-optical crystal assembly and the optical rotation element are spaced apart along the X direction; the plurality of magnets include a second magnet, which is spaced apart from the first magnet along the Y direction perpendicular to the X direction, and is located on opposite sides of the magneto-optical crystal.
[0008] Furthermore, the optical isolation assembly also includes a second adjustment element, which is fixedly connected to the magneto-optical crystal;
[0009] The second adjusting member can move relative to the magnet in the X direction, thereby causing the magneto-optical crystal to move relative to the magnet in the X direction; and / or, the second adjusting member can move relative to the magnet in the Y direction, thereby causing the magneto-optical crystal to move relative to the magnet in the Y direction.
[0010] Furthermore, the magneto-optical crystal assembly also includes a fixed sleeve that is fixedly fitted onto the magneto-optical crystal, and a second adjusting member that is fixedly connected to the fixed sleeve.
[0011] Furthermore, the second adjusting element is rod-shaped.
[0012] Furthermore, the magneto-optical crystal assembly and the optical rotation element are spaced apart along the X direction. The optical rotation element can rotate around the first axis, and the direction of the first axis is the same as the X direction. The optical isolation assembly also includes a third adjustment member, which is fixedly connected to the optical rotation element. The third adjustment member can rotate around the first axis, thereby driving the optical rotation element to rotate around the first axis.
[0013] Furthermore, the optical isolation assembly also includes a mounting base with a fixing hole, in which the optical rotation element is fixed, and a third adjustment element is fixedly connected to the mounting base.
[0014] Furthermore, the optical isolation component also includes a first polarization beam splitter and a second polarization beam splitter. The first polarization beam splitter is disposed on the side of the magneto-optical crystal component away from the optical rotation element, and the second polarization beam splitter is disposed on the side of the optical rotation element away from the magneto-optical crystal component.
[0015] Compared with the prior art, the beneficial effects of the optical isolation component provided in this application are as follows: During operation, the magneto-optical crystal assembly and the optical rotator are placed between the first polarization beam splitter and the second polarization beam splitter, so that light passes sequentially through the first polarization beam splitter, the magneto-optical crystal in the magneto-optical crystal assembly, the optical rotator, and the second polarization beam splitter. When it is necessary to adjust the center wavelength of the isolation, firstly, the magneto-optical crystal can be moved relative to the magnet, and the magnetic induction intensity can be adjusted by changing the position of the magneto-optical crystal in the magnetic field, thereby adjusting the center wavelength of the isolation; secondly, the magnet can be moved closer to or away from the magneto-optical crystal to adjust the strength of the magnetic field, thereby adjusting the magnetic induction intensity, and thus adjusting the center wavelength of the isolation; thirdly, the center wavelength of the isolation can be adjusted by rotating the optical rotator to adjust the angle of the optical rotator. Compared to traditional optical isolators that adjust the center wavelength of isolation through an electronically controlled coil, the optical isolator component of this application provides multiple adjustment methods to adjust the center wavelength of isolation. Operators can select one or more of these methods according to the actual application scenario, making the adjustment more flexible. During adjustment, only the position of the magneto-optical crystal, magnet, or optical rotation element needs to be adjusted, without the need for additional external circuit systems for coils and control coils. This makes the operation more convenient, reduces the overall space occupied, and lowers the manufacturing cost, which is beneficial for mass production. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the structure of the optical isolation component provided in the embodiments of this application;
[0018] Figure 2 Schematic diagram of the forward-passing optical path and polarization state of the optical isolation component provided in the embodiments of this application. Figure 1 ;
[0019] Figure 3 Schematic diagram of the reverse isolation optical path and polarization state of the optical isolation component provided in the embodiments of this application. Figure 1 ;
[0020] Figure 4 Schematic diagram of the forward-passing optical path and polarization state of the optical isolation component provided in the embodiments of this application. Figure 2 ;
[0021] Figure 5 Schematic diagram of the reverse isolation optical path and polarization state of the optical isolation component provided in the embodiments of this application. Figure 2 .
[0022] The following are the labeling elements in the figure:
[0023] 10. Magneto-optical crystal assembly; 11. Magneto-optical crystal; 12. Magnet; 121. First magnet; 122. Second magnet; 13. Fixing sleeve;
[0024] 20. Optical rotation element;
[0025] 30. First adjusting component;
[0026] 40. Second adjusting component;
[0027] 50. Third adjusting component;
[0028] 60. Mounting bracket;
[0029] 70. First polarization beam splitter;
[0030] 80. Second polarization beam splitter;
[0031] 90. Third polarization beam splitter;
[0032] 100. Fourth polarization beam splitter. Detailed Implementation
[0033] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.
[0034] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0037] like Figure 1 As shown, this application provides an optical isolation component, including a magneto-optical crystal component 10 and an angle-adjustable optical rotation element 20 arranged at intervals along the light transmission direction. The magneto-optical crystal component 10 includes a magneto-optical crystal 11 and a plurality of magnets 12 arranged around the magneto-optical crystal 11. The magneto-optical crystal 11 can move relative to the magnets 12 to adjust the magnetic induction intensity, and at least one of the magnets 12 can move toward or away from the magneto-optical crystal 11 to adjust the magnetic field strength.
[0038] During operation, the magneto-optical crystal assembly 10 and the optical rotation element 20 are placed between the first polarization beam splitter 70 and the second polarization beam splitter 80, allowing light to pass sequentially through the first polarization beam splitter 70, the magneto-optical crystal 11 in the magneto-optical crystal assembly 10, the optical rotation element 20, and the second polarization beam splitter 80. The first polarization beam splitter 70, the magneto-optical crystal 11, the optical rotation element 20, and the second polarization beam splitter 80 work together to allow light to propagate in one direction while blocking light from propagating in the opposite direction, thereby isolating reflected light.
[0039] Isolation is an important indicator of an optical isolator's ability to suppress optical signal reflection and echo. Generally, the higher the isolation value, the better the isolation effect of the optical isolator on reverse-transmitted light. The horizontal axis of the isolation curve of an optical fiber isolator typically represents wavelength, and the vertical axis typically represents isolation. The center wavelength of the isolation corresponds to the trough position of the isolation curve. When it is necessary to adjust the center wavelength of the isolation, firstly, the magneto-optical crystal 11 can be moved relative to the magnet 12. By changing the position of the magneto-optical crystal 11 in the magnetic field, the magnetic induction intensity is adjusted, thereby adjusting the center wavelength of the isolation. Secondly, the magnet 12 can be moved closer to or further away from the magneto-optical crystal 11 to adjust the strength of the magnetic field, thereby adjusting the magnetic induction intensity and thus adjusting the center wavelength of the isolation. Thirdly, the angle of the optical rotator 20 can be adjusted by rotating the optical rotator element 20, thereby adjusting the center wavelength of the isolation. The greater the spacing between the magnets 12, the weaker the magnetic field; conversely, the smaller the spacing between the magnets 12, the stronger the magnetic field. That is, moving the magnets 12 closer to the magnet-optical crystal 11 strengthens the magnetic field, while moving them away from the magnet-optical crystal 11 weakens the magnetic field. It should be noted that during adjustment, a single magnet 12 can be moved closer to or further away from the magnet-optical crystal 11, or multiple magnets 12 can be moved simultaneously in the same direction.
[0040] Compared to traditional optical isolators that adjust the center wavelength of isolation through an electronically controlled coil, the optical isolator component of this application provides multiple adjustment methods to adjust the center wavelength of isolation. Operators can select one or more of these methods according to the actual application scenario, making the adjustment more flexible. During adjustment, only the position of the magneto-optical crystal 11, magnet 12, or optical rotation element 20 needs to be adjusted. There is no need to set up an external circuit system for coils and control coils, making the operation more convenient. It can also reduce the overall space occupied and reduce the manufacturing cost, which is conducive to mass production.
[0041] The total optical rotation angle θ of the optical isolator determines the center wavelength of the isolation. The total optical rotation angle θ = magneto-optical rotation angle α + compensation optical rotation angle β, where the magneto-optical rotation angle α is related to the magnetic flux density B. Moving the magneto-optical crystal 11 relative to the magnet 12 adjusts the position of the magneto-optical crystal 11 in the magnetic field, thereby adjusting the magnetic flux density B, which in turn adjusts the magneto-optical rotation angle α, and consequently, the center wavelength of the isolation. Similarly, moving the magnet 12 closer to or further away from the magneto-optical crystal 11 adjusts the strength of the magnetic field, which in turn adjusts the magnetic flux density B, thereby adjusting the magneto-optical rotation angle α, and consequently, the center wavelength of the isolation. Rotating the optical rotation element 20 adjusts the compensation optical rotation angle β, thus adjusting the center wavelength of the isolation.
[0042] The magneto-optical crystal 11 can be a magneto-optical element such as TGG (terbium gallium garnet) or TSAG (terbium scandium aluminum garnet), the magnet 12 can be a permanent magnet, and the optical rotator 20 can be an optical rotator crystal such as a quartz optical rotator crystal or a half-wave plate. The thickness of the optical rotator 20 determines the approximate adjustment range of the isolation center wavelength. For example, if the adjustable isolation center wavelength is 1020nm-1040nm, then the selected working center wavelength of the optical rotator 20 is 1030nm.
[0043] In one embodiment, such as Figure 1 As shown, the plurality of magnets 12 include a first magnet 121, which repels the other magnets 12. The repulsive force between the first magnet 121 and the other magnets 12 causes the first magnet 121 to move away from the magneto-optical crystal 11. The optical isolation assembly also includes a first adjustment member 30, which drives the first magnet 121 to move closer to the magneto-optical crystal 11. By driving the first magnet 121 to move closer to the magneto-optical crystal 11 through the first adjustment member 30, the distance between the first magnet 121 and the other magnets 12 can be reduced, the magnetic field can be strengthened, and thus the center wavelength of the isolation can be changed. When it is necessary to weaken the magnetic field, it is not necessary to use the first adjustment member 30 to drive the first magnet 121 to move away from the magneto-optical crystal 11. Instead, the repulsive force between the first magnet 121 and the other magnets 12 causes the first magnet 121 to move automatically away from the magneto-optical crystal 11, which makes the adjustment more convenient and helps to reduce energy consumption.
[0044] In one embodiment, the first adjusting member 30 abuts against the side of the first magnet 121 facing away from the magneto-optical crystal 11; the optical isolation assembly also includes a mating member (not shown), to which the first adjusting member 30 is threadedly connected. When the first adjusting member 30 rotates relative to the mating member, it can move towards and away from the magneto-optical crystal 11. The first adjusting member 30 can be used as a knob, converting the rotational movement of the first adjusting member 30 into linear movement, making the adjustment operation more convenient. When the first adjusting member 30 rotates relative to the mating member and moves towards the magneto-optical crystal 11, it can push the first magnet 121 towards the magneto-optical crystal 11. When the first adjusting member 30 rotates relative to the mating member and moves away from the magneto-optical crystal 11, the first magnet 121 can automatically move away from the magneto-optical crystal 11 under repulsive force. The rotation of the first adjusting member 30 can be controlled manually or by a power device; the latter can replace manual operation, reducing the labor intensity of workers and improving adjustment accuracy. Specifically, the mating component can be a box, in which the magneto-optical crystal 11 and the magnet 12 are both housed. The box has a threaded hole with an internal thread, and the first adjusting component 30 has an external thread that mates with the internal thread.
[0045] In one embodiment, such as Figure 1 As shown, the magneto-optical crystal assembly 10 and the optical rotation assembly are spaced apart along the X-direction. Multiple magnets 12 include a second magnet 122, which is spaced apart from the first magnet 121 along the Y-direction perpendicular to the X-direction, and located on opposite sides of the magneto-optical crystal 11 in the Y-direction. By arranging the first magnet 121 and the second magnet 122 spaced apart along the Y-direction perpendicular to the X-direction and located on opposite sides of the magneto-optical crystal 11, the first magnet 121 and the second magnet 122 can be prevented from blocking light transmission along the X-direction, ensuring the normal operation of the optical isolation assembly. When the first adjusting member 30 is rotated to move the first magnet 121 closer to the magneto-optical crystal 11, the distance between the first magnet 121 and the second magnet 122 decreases, and the magnetic field formed between the first magnet 121 and the second magnet 122 is strengthened, thereby increasing the magnetic induction intensity of the magneto-optical crystal 11 and the magnetic field. When the first adjusting member 30 is rotated, moving it away from the magneto-optical crystal 11, the first magnet 121 and the second magnet 122 repel each other. Therefore, the first magnet 121 automatically moves away from the magneto-optical crystal 11 under the repulsive force, increasing the distance between them and weakening the magnetic field. This reduces the magnetic induction intensity of the magneto-optical crystal 11 and the magnetic field. The second magnet 122 can be fixed by a fixing device to maintain a constant distance between it and the magneto-optical crystal 11. In other embodiments, a first adjusting member 30 may also be provided on the side of the second magnet 122 facing away from the magneto-optical crystal 11. When the first adjusting member 30 is rotated to move closer to the magneto-optical crystal 11, it pushes the second magnet 122 to move closer to the magneto-optical crystal 11. When the first adjusting member 30 is rotated to move away from the magneto-optical crystal 11, the second magnet 122 automatically moves away from the first magnet 121 under the action of repulsion. The two first adjusting members 30 can make the first magnet 121 and the second magnet 122 move simultaneously towards or away from each other. In addition, in other embodiments, the number of magnets 12 can be three, four, five or more. For example, when the number of magnets 12 is three, the three magnets 12 are the first magnet 121, the second magnet 122 and the third magnet, which can be evenly distributed around the magneto-optical crystal 11.
[0046] In one embodiment, such as Figure 1As shown, the optical isolation assembly also includes a second adjustment member 40, which is fixedly connected to the magneto-optical crystal 11. The second adjustment member 40 can move relative to the magnet 12 in the X direction, thereby causing the magneto-optical crystal 11 to move relative to the magnet 12 in the X direction, and / or, the second adjustment member 40 can move relative to the magnet 12 in the Y direction, thereby causing the magneto-optical crystal 11 to move relative to the magnet 12 in the Y direction. The movement of the second adjustment member 40 can be controlled manually or by a power device. The latter can replace manual operation, reduce the labor intensity of workers, and improve adjustment accuracy. By moving the magneto-optical crystal 11 in either the X or Y direction, the magnetic induction intensity can be changed, thereby adjusting the center wavelength of the isolation.
[0047] In one embodiment, such as Figure 1 As shown, the second adjusting member 40 is rod-shaped. The rod-shaped design of the second adjusting member 40 results in a small size and light weight, flexible movement, easy operation, and simple manufacturing, thus reducing production costs. Specifically, a linear track extending along the X direction can be provided. One end of the second adjusting member 40 is connected to the magneto-optical crystal 11, and the other end is slidably connected to the linear track, thereby ensuring that the second adjusting member 40 drives the magneto-optical crystal 11 to move in a straight line.
[0048] In one embodiment, such as Figure 1 As shown, the magneto-optical crystal assembly 10 also includes a fixing sleeve 13 fixedly sleeved on the magneto-optical crystal 11. A second adjusting member 40 is fixedly connected to the fixing sleeve 13. The second adjusting member 40 moves the fixing sleeve 13, thereby moving the magneto-optical crystal 11. The second adjusting member 40 and the fixing sleeve 13 can be integrally formed or separately processed and then assembled, specifically, they can be fixed by adhesive bonding. The fixing sleeve 13 and the magneto-optical crystal 11 can also be fixed by adhesive bonding. The fixing sleeve 13 can be made of a high thermal conductivity material such as copper, which can improve the heat dissipation capacity of the magneto-optical crystal 11 and reduce the thermal lensing effect at high power.
[0049] In one embodiment, such as Figure 1As shown, the optical rotator 20 can rotate around a first axis, the direction of which is the same as the X-direction. The optical isolation assembly also includes a third adjustment member 50, which is fixedly connected to the optical rotator 20. The third adjustment member 50 can rotate around the first axis, thereby driving the optical rotator 20 to rotate around the first axis. The rotation of the third adjustment member 50 can be controlled manually or by a power device. The latter can replace manual operation, reduce the labor intensity of workers, and improve adjustment accuracy. The rotation of the optical rotator 20 around the first axis driven by the third adjustment member 50 can adjust the center wavelength of the isolation. Specifically, the first axis passes through the magneto-optical crystal 11 and the center point of the optical rotator 20. The angle adjustment range of the optical rotator 20 can be 0°-360°.
[0050] In one embodiment, such as Figure 1 As shown, the third adjusting member 50 is rod-shaped. The rod-shaped design of the third adjusting member 50 results in a small size and light weight, flexible movement, easy operation, and simple manufacturing, thus reducing production costs. Specifically, an annular track surrounding the first axis can be provided around the outer periphery of the third adjusting member 50. One end of the third adjusting member 50 is connected to the optical rotating element 20, and the other end is slidably connected to the annular track, thereby ensuring that the third adjusting member 50 drives the optical rotating element 20 to rotate around the first axis.
[0051] In one embodiment, such as Figure 1 As shown, the optical isolation assembly also includes a mounting base 60 with a fixing hole (not shown). The optical rotator 20 is fixed in the fixing hole, and a third adjusting member 50 is fixedly connected to the mounting base 60. The third adjusting member 50 rotates the mounting base 60, thereby rotating the optical rotator 20. The third adjusting member 50 and the mounting base 60 can be integrally formed or separately processed and then assembled, specifically, they can be fixed by adhesive bonding. The mounting base 60 and the optical rotator 20 can also be fixed by adhesive bonding. Specifically, the shape of the fixing hole is adapted to the shape of the optical rotator 20. For example, the shape of the optical rotator 20 is square, and the fixing hole is correspondingly set as a square hole.
[0052] In one embodiment, such as Figure 1As shown, the optical isolation assembly also includes a first polarization beam splitter 70 and a second polarization beam splitter 80. The first polarization beam splitter 70 is disposed on the side of the magneto-optical crystal assembly 10 away from the optical rotation element 20, and the second polarization beam splitter 80 is disposed on the side of the optical rotation element 20 away from the magneto-optical crystal assembly 10. During operation, light passes sequentially through the first polarization beam splitter 70, the magneto-optical crystal 11 in the magneto-optical crystal assembly 10, the optical rotation element 20, and the second polarization beam splitter 80. The first polarization beam splitter 70, the magneto-optical crystal 11, the optical rotation element 20, and the second polarization beam splitter 80 cooperate to allow light to propagate in one direction while blocking light from propagating in the opposite direction, thereby isolating reflected light.
[0053] The first polarization beam splitter 70 and the second polarization beam splitter 80 can be selected from Wollaston prisms. A Wollaston prism is an optical device composed of two right-angle prisms. When a linearly polarized beam passes through a Wollaston prism, it can be split into two linearly polarized beams with polarization directions perpendicular to each other. The separation angle of the two linearly polarized beams is approximately symmetrical with respect to the optical axis. Common separation angles are 5°, 10°, 15° and 20°.
[0054] like Figure 2 The diagram illustrates the forward-passing optical path and polarization state of the optical isolation component. A beam of 0° polarized light is incident on the first polarization beam splitter 70. Upon passing through the magneto-optical crystal 11, the polarization state rotates counterclockwise by 45°, resulting in 45° polarized light. After passing through the optical rotator 20, the polarization state rotates clockwise by 45°, resulting in 0° polarized light. The second polarization beam splitter 80, after rotation, can receive the 0° polarized light, thus realizing the forward-passing function of the optical isolation component.
[0055] like Figure 3 The diagram illustrates the optical path and polarization state of the reverse isolation mechanism of the optical isolation component. A beam of 90° polarized light is incident on the second polarization beam splitter 80. After passing through the optical rotator 20, the polarization state rotates counterclockwise by 45°, resulting in 45° polarized light. Then, after passing through the magneto-optical crystal 11, the polarization state rotates counterclockwise by 45° again, resulting in 90° polarized light. The first polarization beam splitter 70 outputs the 90° polarized light in a direction opposite to the incident 0° polarized light, preventing the light from returning along its original path, thus achieving the reverse isolation function of the optical isolation component.
[0056] When it is necessary to adjust the center wavelength of the isolation, the position of the magnet 12 is adjusted by the first adjusting member 30 and the position of the magneto-optical crystal 11 is adjusted by the second adjusting member 40, so that the polarization state of the forward and reverse light after passing through the magneto-optical crystal 11 rotates counterclockwise by 45°. The optical rotator 20 is rotated to a suitable angle by the third adjusting member 50, so that the polarization state of the forward light after passing through the optical rotator 20 rotates clockwise by 45°, and the polarization state of the reverse light after passing through the optical rotator 20 rotates counterclockwise by 45°.
[0057] In one embodiment, combined Figure 4 and Figure 5 As shown, the first polarization beam splitter 70 can be replaced by the third polarization beam splitter 90, and the second polarization beam splitter 80 can be replaced by the fourth polarization beam splitter 100. The angle of the third polarization beam splitter 90 is different from the angle of the first polarization beam splitter 70, and the angle of the fourth polarization beam splitter 100 is different from the angle of the second polarization beam splitter 80. Figure 4 The diagram shown illustrates the forward-moving optical path and polarization state. Figure 5 The diagram shows the optical path and polarization state of reverse isolation. When the light passes through in reverse, the light emitted from the third polarization beam splitter 90 is on the side. Compared with the first polarization beam splitter 70, it can more effectively isolate the reflected light and improve the isolation degree.
[0058] It should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. An optical isolation assembly, characterized by, The optical isolation assembly comprises a magneto-optical crystal assembly and an angle-adjustable optical rotator, the magneto-optical crystal assembly comprises a magneto-optical crystal and a plurality of magnets arranged around the magneto-optical crystal, the magneto-optical crystal is capable of moving relative to the magnets to adjust the magnetic induction intensity, at least one of the magnets is capable of moving towards or away from the magneto-optical crystal to adjust the magnetic field intensity.
2. The optical isolation assembly of claim 1, wherein: The plurality of magnets comprises a first magnet, the first magnet repels other magnets, the repulsion between the first magnet and other magnets enables the first magnet to move away from the magneto-optical crystal; the optical isolation assembly further comprises a first adjusting member, the first adjusting member is used to drive the first magnet to move towards the magneto-optical crystal.
3. The optical isolation assembly of claim 2, wherein: The first adjusting member abuts against a side of the first magnet away from the magneto-optical crystal; the optical isolation assembly further comprises a cooperating member, the first adjusting member is threadedly connected with the cooperating member, the first adjusting member is capable of moving towards or away from the magneto-optical crystal when rotating relative to the cooperating member.
4. The optical isolation assembly of claim 2, wherein: The magneto-optical crystal assembly and the optical rotator are arranged apart along an X direction; the plurality of magnets comprises a second magnet, the second magnet is arranged apart from the first magnet along a Y direction perpendicular to the X direction, and is located on an opposite side of the magneto-optical crystal.
5. The optical isolation assembly of claim 4, wherein: The optical isolation assembly further comprises a second adjusting member, the second adjusting member is fixedly connected with the magneto-optical crystal; The second adjusting member is capable of moving along the X direction relative to the magnets, thereby driving the magneto-optical crystal to move along the X direction relative to the magnets; and / or, the second adjusting member is capable of moving towards the Y direction relative to the magnets, thereby driving the magneto-optical crystal to move along the Y direction relative to the magnets.
6. The optical isolation assembly of claim 5, wherein: The magneto-optical crystal assembly further comprises a fixing sleeve fixedly sleeved on the magneto-optical crystal, the second adjusting member is fixedly connected with the fixing sleeve.
7. The optical isolation assembly of claim 5, wherein: The second adjusting member is in the shape of a rod.
8. The optical isolation assembly of claim 1, wherein: The magneto-optical crystal assembly and the optical rotator are arranged apart along an X direction, the optical rotator is capable of rotating around a first axis, the direction of the first axis is the same as the X direction; the optical isolation assembly further comprises a third adjusting member, the third adjusting member is fixedly connected with the optical rotator, the third adjusting member is capable of rotating around the first axis, thereby driving the optical rotator to rotate around the first axis.
9. The optical isolation assembly of claim 8, wherein: The optical isolation assembly further comprises a mounting base, the mounting base is provided with a fixing hole, the optical rotator is fixed in the fixing hole, and the third adjusting member is fixedly connected with the mounting base.
10. The optical isolation assembly of any of claims 1-9, wherein: The optical isolation assembly further comprises a first polarization beam splitting element and a second polarization beam splitting element, the first polarization beam splitting element is arranged on a side of the magneto-optical crystal assembly away from the optical rotator, and the second polarization beam splitting element is arranged on a side of the optical rotator away from the magneto-optical crystal assembly.