Magneto-optic switch

Abstract

The application discloses a magneto-optical switch and an optical system. The magneto-optical switch comprises an optical input port and an optical output port, a first polarization beam splitting component, a magneto-optical crystal, a second polarization beam splitting component, a first reflecting surface and a magnetic field generator. The first reflecting surface and the optical output port are located on different sides of the second polarization beam splitting component. In this way, on the one hand, the first polarization component and the second polarization component can be reflected, and the effect that the first polarization component and the second polarization component do not interfere with each other in the process of emission and incidence can be realized; on the other hand, by controlling the magnetic field generator to apply or remove the magnetic field to the magneto-optical crystal, the function of the switch can be realized, and the operation is convenient.

Description

Technical Field

[0001] This application relates to the field of switch technology, and more particularly to a magneto-optical switch. Background Technology

[0002] An optical switch (OS) is a device with one or more selectable transmission windows that can convert or perform logical operations on optical signals in optical transmission lines or integrated optical circuits.

[0003] In related technologies, crosstalk can occur between light beams when optical switches are in use, making operation inconvenient. Utility Model Content

[0004] This application provides a magneto-optical switch, which improves the ease of use of the magneto-optical switch and at least partially solves the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a magneto-optical switch is provided, the magneto-optical switch comprising: Optical input port and optical output port; The first polarization beam splitter is used to split the incident light from the optical input port into a first polarization component and a second polarization component. A magneto-optical crystal is disposed in the output light path of the first polarization beam splitter and is used to change the polarization direction of the light passing through it under the action of a magnetic field. The second polarization beam splitter is disposed on the outgoing light path of the magneto-optical crystal; The first reflective surface and the light output port are located on different sides of the second polarization beam splitter; A magnetic field generator is used to apply or remove a magnetic field from the magneto-optical crystal; In one case, with or without a magnetic field applied, the first polarization component and the second polarization component are guided by the second polarization beam splitter to the optical output port for beam combining and emission. In another case, the first polarization component and the second polarization component are guided by the second polarization beam splitter to the first reflective surface, and after reflection, they sequentially pass through the second polarization beam splitter, the magneto-optical crystal, and the first polarization beam splitter back to the optical input port.

[0006] Optionally, the first polarization beam splitter includes a first polarization beam splitting surface and a second reflecting surface; The first polarization beam-splitting surface is configured to reflect the first polarization component and transmit the second polarization component; The second reflecting surface is disposed opposite to the first polarization beam-splitting surface and configured to reflect the first polarization component to the magneto-optical crystal; The second polarization beam splitter includes a second polarization beam splitting surface and a third reflecting surface; The third reflecting surface and the first polarizing beam splitter are disposed on opposite sides of the magneto-optical crystal and configured to reflect the light emitted from the magneto-optical crystal to the second polarizing beam splitter. The second polarization beam-splitting surface and the second reflecting surface are disposed on opposite sides of the magneto-optical crystal and configured to reflect the first polarization component and transmit the second polarization component.

[0007] Optionally, the optical output port is located on the side of the second polarization beam splitter away from the magneto-optical crystal; The first reflecting surface is located on the side of the second polarization beam-splitting surface that is away from the third reflecting surface; When the magnetic field generator does not apply a magnetic field to the magneto-optical crystal: The first polarization component retains its polarization direction after passing through the magneto-optical crystal and is reflected by the second polarization beam splitter to the first reflecting surface; the second polarization component retains its polarization direction after passing through the magneto-optical crystal and is reflected by the third reflecting surface to the second polarization beam splitter, and is transmitted through it to the first reflecting surface; the first reflecting surface reflects the first polarization component and the second polarization component, allowing them to return to the optical input port along their original paths; When the magnetic field generator applies a magnetic field to the magneto-optical crystal: The polarization direction of the first polarization component is rotated after passing through the magneto-optical crystal, transmitted through the second polarization beam splitter, and emitted from the light output port; the polarization direction of the second polarization component is rotated after passing through the magneto-optical crystal, reflected by the third reflector to the second polarization beam splitter, and reflected by it, and emitted from the light output port.

[0008] Optionally, the incident direction defined by the optical input port is parallel to the exit direction defined by the optical output port.

[0009] Optionally, the first reflecting surface is located on the side of the second polarization beam-splitting surface away from the magneto-optical crystal; The optical output port is located on the side of the second polarization beam splitter that is away from the third reflecting surface; When the magnetic field generator does not apply a magnetic field to the magneto-optical crystal: The first polarization component retains its polarization direction after passing through the magneto-optical crystal, is reflected by the second polarization beam splitter, and exits from the light output port; the second polarization component retains its polarization direction after passing through the magneto-optical crystal, is reflected by the third reflecting surface to the second polarization beam splitter, is transmitted through it, and exits from the light output port. When the magnetic field generator applies a magnetic field to the magneto-optical crystal: The polarization direction of the first polarization component is rotated after passing through the magneto-optical crystal, and it is transmitted to the first reflecting surface by the second polarization beam splitter. The polarization direction of the second polarization component is rotated after passing through the magneto-optical crystal, and it is reflected to the second polarization beam splitter by the third reflecting surface, and then reflected to the first reflecting surface. The first reflecting surface reflects the first polarization component and the second polarization component, so that they return to the optical input port along the original path.

[0010] Optionally, the first polarization beam-splitting surface is parallel to and opposite to the second reflecting surface.

[0011] Optionally, the second polarizing beam-splitting surface is parallel to and opposite to the third reflecting surface.

[0012] Optionally, the first polarization beam splitter includes a first body and a first lens; the two opposite surfaces of the first body are the first polarization beam splitter surface and the second reflecting surface, respectively, and the first lens is disposed between the first polarization beam splitter surface and the magneto-optical crystal.

[0013] Optionally, the second polarization beam splitter includes a second body and a second lens; the two opposite surfaces of the second body are the second polarization beam splitter surface and the third reflecting surface, respectively, and the second lens is disposed between the third reflecting surface and the magneto-optical crystal.

[0014] Optionally, the first lens and the magneto-optical crystal are bonded together by an optical adhesive layer.

[0015] Optionally, the second lens and the magneto-optical crystal are bonded together by an optical adhesive layer.

[0016] Optionally, the magneto-optical crystal includes a first crystal portion and a second crystal portion spaced apart, the first crystal portion being located on the reflected light path of the second reflecting surface, and the second crystal portion being located on the transmitted light path of the first polarization beam splitting surface.

[0017] Optionally, the first crystal portion and the second crystal portion are located within the same magnetic field of the magnetic field generator; Optionally, the number of magnetic field generators is set to two, with the first crystal part disposed in the magnetic field of one of the magnetic field generators and the second crystal part disposed in the magnetic field of the other magnetic field generator.

[0018] The beneficial effect of this application is that it provides a magneto-optical switch that can improve ease of use.

[0019] More specifically, some embodiments of this application may produce the following specific beneficial effects: In the magneto-optical switch of this application embodiment, the first reflective surface and the light output port are located on different sides of the second polarization beam splitter. In this way, on the one hand, the first polarization component and the second polarization component can be reflected, so that the first polarization component and the second polarization component do not interfere with each other during the emission and incident processes; on the other hand, the switching function can be realized by controlling the magnetic field generator to apply or remove the magnetic field to the magneto-optical crystal, which is convenient to operate.

[0020] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments 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.

[0022] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0023] Figure 1 This is a schematic diagram of the overall structure of the magneto-optical switch provided in an exemplary embodiment of this application; Figure 2 This is provided in an exemplary embodiment of this application. Figure 1 A schematic diagram of the cross-sectional structure; Figure 3 This is a schematic diagram of the structure of the first polarization beam splitter, the magneto-optical crystal, and the second polarization beam splitter provided in an exemplary embodiment of this application; Figure 4 yes Figure 3 A schematic diagram of the exploded structure; Figure 5 This is a schematic diagram of the overall structure of Example 1 of this application; Figure 6 This is a schematic diagram of the incident direction of the polarization component of the incident light when the magnetic field generator is not powered on and the magneto-optical switch is in the closed state, as shown in Example 1. Figure 7 This is a schematic diagram of the return path of the polarization component incident light when the magnetic field generator is not powered on and the magneto-optical switch is in the closed state, as shown in Example 1. Figure 8 This is a schematic diagram of the incident and outgoing paths of the polarization component of the incident light when the magnetic field generator is energized and acts on the magneto-optical crystal and the magneto-optical switch is in the on state, as shown in Example 1. Figure 9 This is a schematic diagram of the overall structure of Example 2 of this application; Figure 10 This is a schematic diagram of the incident and outgoing paths of the polarization component of the incident light when the magnetic field generator is de-energized and the magneto-optical switch is in the on state, as shown in Example 2. Figure 11 This is a schematic diagram of the incident direction of the polarization component of the incident light when the magnetic field generator is energized and acts on the magneto-optical crystal, and the magneto-optical switch is in the closed state, as shown in Example 2. Figure 12 This is a schematic diagram showing the return path of the polarization component incident light when the magnetic field generator is energized and acts on the magneto-optical crystal, and the magneto-optical switch is in the off state, as shown in Example 2.

[0024] Explanation of reference numerals in the attached figures: 100. Magneto-optical switch; 100a, Optical input port; 100b, Optical output port; 100c, Central axis; 110. Magnetic field generator; 120, First polarization beam splitter component; 120a, First polarization beam splitter surface; 120b, Second reflecting surface; 121. The first ontology; 121a, First side view; 121b, Second side view; 121c, Third side view; 121d, Fourth side view; 122. First lens; 130. Magneto-optical crystal; 131. First crystal section; 132. Second crystal section; 140. Second polarization beam splitter assembly; 140a. Second polarization beam splitter surface; 140b. Third reflecting surface; 141. The Second Body; 141a, Fifth side view; 141b, Sixth side view; 141c, Seventh side view; 141d, Eighth side view; 142. Second lens; 150. First reflecting surface; 200a, incident light; 200a1, first polarization component; 200a2, second polarization component; F1, incident direction; F2, exit direction. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0026] Based on the technical issues mentioned in the background, mechanical optical switches and micro-electro-mechanical systems (MEMS) optical switches in related technologies cannot meet the requirements of this scenario. Taking a MEMS optical switch as an example, if the MEMS optical switch is in the off state and perpendicular to the light source, it can meet the requirements of the off state in the target scenario. That is, when the optical switch is closed, light with different polarization states such as linear polarization, circular polarization, and elliptic polarization needs to be able to return (i.e., return along the original path), and as much light energy as possible needs to be returned. However, when it is necessary to open the MEMS optical switch, during the switching process, the light will take other paths instead of only being emitted through the optical switch's output channel or returning towards the light source (i.e., returning along the original path). Therefore, it cannot meet the requirements of the application scenario.

[0027] In view of this, this application provides a magneto-optical switch that can avoid light crosstalk during use.

[0028] refer to Figure 1 One embodiment of this application provides a magneto-optical switch 100. (See reference...) Figure 2 The magneto-optical switch 100 includes: an optical input port 100a and an optical output port 100b, a first polarization beam splitter 120, a magneto-optical crystal 130, a second polarization beam splitter 140, a first reflective surface 150, and a magnetic field generator 110.

[0029] Among them, combined Figure 6 As shown, in this embodiment, the first polarization beam splitter 120 is used to split the incident light 200a from the optical input port 100a into a first polarization component 200a1 and a second polarization component 200a2. A magneto-optical crystal 130 is disposed in the outgoing optical path of the first polarization beam splitter 120. The magneto-optical crystal 130 can undergo a magneto-optical effect under the influence of a magnetic field, thereby changing the polarization direction of the light as it passes through the crystal. A second polarization beam splitter 140 is disposed in the outgoing optical path of the magneto-optical crystal 130. A magnetic field generator 110 is used to apply or remove a magnetic field from the magneto-optical crystal 130.

[0030] In one case, with or without a magnetic field applied, the first polarization component 200a1 and the second polarization component 200a2 are guided by the second polarization beam splitter 140 to the optical output port 100b for beam combining and emission. In the other case, the first polarization component 200a1 and the second polarization component 200a2 are guided by the second polarization beam splitter 140 to the first reflecting surface 150, and after reflection, they return to the optical input port 100a in sequence through the second polarization beam splitter 140, the magneto-optical crystal 130, and the first polarization beam splitter 120.

[0031] It should be noted that in this embodiment, the first polarization component 200a1 includes S-polarized light, and the second polarization component 200a2 includes P-polarized light. S-polarized light refers to linearly polarized light whose polarization direction is perpendicular to the plane of incidence. P-polarized light refers to linearly polarized light whose polarization direction is parallel to the plane of incidence. Both the first polarization beam splitter 120 and the second polarization beam splitter 140 can reflect S-light and allow P-light to pass through. That is, the first polarization beam splitter 120 and the second polarization beam splitter 140 can reflect and change the optical path direction of S-light, but will not change the optical path direction of P-light.

[0032] Understandably, when the first polarization component 200a1 and the second polarization component 200a2 are guided by the second polarization beam splitter 140 to the optical output port 100b for beam combining and emission, the magneto-optical switch 100 is in the open state. When the first polarization component 200a1 and the second polarization component 200a2 are guided by the second polarization beam splitter 140 to the first reflecting surface 150, and after reflection, sequentially pass through the second polarization beam splitter 140, the magneto-optical crystal 130, and the first polarization beam splitter 120 back to the optical input port 100a, the magneto-optical switch 100 is in the closed state.

[0033] Optionally, in some embodiments, the energization and de-energization of the magnetic field generator 110 correspond to the on and off states of the magneto-optical switch 100 in this embodiment, respectively. In other embodiments, the energization and de-energization of the magnetic field generator 110 may correspond to the off and on states of the magneto-optical switch 100, respectively. This will be illustrated in specific examples below.

[0034] In the magneto-optical switch 100 of this application embodiment, the first reflective surface 150 and the light output port 100b are located on different sides of the second polarization beam splitter 140. In this way, on the one hand, the first polarization component 200a1 and the second polarization component 200a2 can be reflected, so that the first polarization component 200a1 and the second polarization component 200a2 do not interfere with each other during the emission and incident processes. On the other hand, the switching function can be realized by controlling the magnetic field generator to apply or remove the magnetic field to the magneto-optical crystal 130, which is convenient to operate.

[0035] In some embodiments, reference Figure 3 and Figure 4 The first polarization beam splitter 120 in this embodiment includes a first polarization beam splitting surface 120a and a second reflecting surface 120b. The second polarization beam splitter 140 in this embodiment includes a second polarization beam splitting surface 140a and a third reflecting surface 140b.

[0036] Specifically, the first polarizing beam splitter 120a is configured to reflect the first polarization component 200a1 and transmit the second polarization component 200a2. The second reflecting surface 120b is disposed opposite to the first polarizing beam splitter 120a, and is configured to reflect the first polarization component 200a1 to the magneto-optical crystal 130. The third reflecting surface 140b is disposed on opposite sides of the first polarizing beam splitter 120a. That is, the third reflecting surface 140b is disposed on the outgoing light path of the magneto-optical crystal 130 for the transmitted light from the first polarizing beam splitter 120a, and is configured to reflect the light emitted from the magneto-optical crystal 130 back to the second polarizing beam splitter 140a. The second polarizing beam splitter 140a and the second reflecting surface 120b are disposed on opposite sides of the magneto-optical crystal. That is, the second polarization beam splitter 140a is disposed on the output light path of the magneto-optical crystal 130 for the reflected light from the second reflecting surface 120b, and the second polarization beam splitter 140a is configured to reflect the first polarization component 200a1 and transmit the second polarization component 200a2.

[0037] In this embodiment of the application, by adopting the above-described technical solution, through the cooperation of the first polarization beam splitting surface and the second reflective surface 120b of the first polarization beam splitting component 120, and the cooperation of the second polarization beam splitting surface 140a and the third reflective surface 140b of the second polarization beam splitting component 140, the first polarization component 200a1 and the second polarization component 200a2 can be effectively separated and transmitted along a specific path during propagation. Ultimately, they can be combined and emitted at the second polarization beam splitting surface 140a, or reflected by the first reflective surface 150 and returned along the original path, thereby realizing the control of the transmission path of the optical signal.

[0038] Specifically, the first polarization component 200a1 is reflected by the first polarization beam splitter 120a and then by the second reflecting surface 120b to be transmitted to the second polarization beam splitter 140a. The second polarization component 200a21 is transmitted through the first polarization beam splitter 120a and then by the third reflecting surface 140b to be transmitted to the second polarization beam splitter 140a. In this way, the first polarization component 200a1 and the second polarization component 200a2 are transmitted to the second polarization beam splitter 140a via different paths, reducing the mutual interference (crosstalk) between the two polarization components.

[0039] Furthermore, in order to improve the stability and reliability of the magneto-optical switch 100, in the embodiments of this application, reference is made to... Figure 3The first polarizing beam splitter 120a and the second polarizing beam splitter 140a can be symmetrical about the central axis 100c, and the second reflecting surface 120b and the third reflecting surface 140b can also be symmetrical about the central axis 100c. This technical solution can reduce the optical path difference between the first polarization component 200a1 and the second polarization component 200a2, thereby eliminating the phase difference between them.

[0040] The magneto-optical switch 100 in the embodiments of this application will be illustrated below with two examples. The main difference between the two examples is that the positions of the light output port 100b and the first reflecting surface 150 relative to the second polarizing beam splitting surface 140a are different. The details are explained below.

[0041] In Example 1, refer to Figure 5 The optical output port 100b is located on the side of the second polarization beam splitter 140a away from the magneto-optical crystal 130. The first reflecting surface 150 is located on the side of the second polarization beam splitter 140a away from the third reflecting surface 140b. In this example, the energization of the magnetic field generator 110 corresponds to the on state of the magneto-optical switch 100. In this state, the first polarization component 200a1 and the second polarization component 200a2 are guided by the second polarization beam splitter 140 to the optical output port 100b for beam combining and emission. The de-energization of the magnetic field generator 110 corresponds to the off state of the magneto-optical switch 100. In this state, the first polarization component 200a1 and the second polarization component 200a2 return to the optical input port 100a along the original path.

[0042] Specifically, refer to Figure 6 When the magnetic field generator 110 is de-energized, it is in a state where no magnetic field is applied to the magneto-optical crystal 130. In this state, the first polarization component 200a1 (e.g., S-polarized light) is reflected by the first polarization beam splitter 120a to the second reflection surface 120b, and continues to be reflected by the second reflection surface 120b, and passes through the magneto-optical crystal 130. After passing through the magneto-optical crystal 130, the first polarization component 200a1 retains its original polarization direction and is reflected by the second polarization beam splitter 140a to the first reflection surface 150. The second polarization component 200a2 (e.g., P-polarized light) retains its original polarization direction after passing through the magneto-optical crystal 130, and is reflected by the third reflection surface 140b to the second polarization beam splitter 140a, and is transmitted through it to the first reflection surface 150.

[0043] Please refer to Figure 7The first polarization component 200a1 and the second polarization component 200a2, which converge at the first reflecting surface 150, are blocked and reflected by the first reflecting surface 150, causing them to return to the optical input port 100a along their original path. That is, the first polarization component 200a1 and the second polarization component 200a2 pass again through the second polarization beam splitter 140a and the magneto-optical crystal 130, and are finally combined by the first polarization beam splitter 120a before exiting from the optical input port 100a, instead of exiting from the optical output port 100b. This technical solution achieves the effect of the magneto-optical switch 100 being in the off state when the magnetic field generator 110 is powered off.

[0044] Please refer to Figure 8 When the magnetic field generator 110 is energized, it applies a magnetic field to the magneto-optical crystal 130. In this state, the polarization directions of both the first polarization component 200a1 and the second polarization component 200a2 are rotated by 90 degrees after passing through the magneto-optical crystal 130 (e.g., S-polarized light becomes P-polarized light, and P-polarized light becomes S-polarized light). Specifically, the first polarization component 200a1 (e.g., S-polarized light) is reflected by the first polarization beam splitter 120a to the second reflection surface 120b, and continues to be reflected by the second reflection surface 120b before passing through the magneto-optical crystal 130. After passing through the magneto-optical crystal 130, the polarization direction of the first polarization component 200a1 is rotated; for example, S-polarized light becomes P-polarized light. This P-polarized light is incident on the second polarization beam splitter 140a. Because the second polarization beam splitter 140a can transmit P-light, the changed first polarization component 200a1 is directly transmitted and emitted from the light output port 100b. After the second polarization component 200a2 (e.g., P-polarized light) passes through the magneto-optical crystal 130, its polarization direction is also rotated, changing from P-polarized light to S-polarized light. This S-polarized light first strikes the third reflecting surface 140b and is reflected by the third reflecting surface 140b to the second polarization beam splitter 140a. Since the polarization state of the second polarization component 200a2 has changed from P-polarized light to S-polarized light at this time, and based on the fact that the second polarization beam splitter 140a can reflect S-polarized light, the changed second polarization component 200a2 is reflected to the optical output port 100b.

[0045] Therefore, please continue reading. Figure 8 The first polarization component 200a1 and the second polarization component 200a2 converge at the optical output port 100b and are emitted as a single beam. This technical solution achieves the effect of energizing the magnetic field generator 110 and keeping the magneto-optical switch 100 in the "on" state. For example... Figure 8 In the process, the first polarization component 200a1 and the second polarization component 200a2 are combined into an output beam 200b, which is emitted from the optical output port 100b.

[0046] In this example, since the first reflecting surface 150 is located on the side of the second polarizing beam splitter 140a away from the third reflecting surface 140b, the incident direction F1 defined by the light input port 100a and the exit direction F2 defined by the light output port 100b are parallel to each other.

[0047] By ensuring that the incident direction F1 defined by the optical input port 100a and the exit direction F2 defined by the optical output port 100b are parallel to each other, the effect of aligning the input and output optical paths is achieved.

[0048] Example 2 differs from Example 1. In Example 2, refer to... Figure 9 The first reflecting surface 150 is located on the side of the second polarizing beam splitter 140a away from the magneto-optical crystal 130. The optical output port 100b is located on the side of the second polarizing beam splitter 140a away from the third reflecting surface 140b. That is, compared to Example 1, the positions of the first reflecting surface 150 and the optical output port 100b have been interchanged in this Example 2.

[0049] In Example 2, energizing the magnetic field generator 110 corresponds to the closed state of the magneto-optical switch 100. In this state, the first polarization component 200a1 and the second polarization component 200a2 return to the optical input port 100a via their original paths. De-energizing the magnetic field generator 110 corresponds to the open state of the magneto-optical switch 100. In this state, the first polarization component 200a1 and the second polarization component 200a2 are guided by the second polarization beam splitter 140 to the optical output port 100b for beam combining and emission.

[0050] Specifically, refer to Figure 10 The magnetic field generator 110 is de-energized, thus it is in a state where no magnetic field is applied to the magneto-optical crystal 130. In this case, the first polarization component 200a1 (e.g., S-polarized light) is reflected by the first polarization beam splitter 120a to the second reflection surface 120b, and then reflected again by the second reflection surface 120b and passes through the magneto-optical crystal 130. After passing through the magneto-optical crystal 130, it retains its polarization direction and is incident on the second polarization beam splitter 140a. Based on the reflection of S-polarized light by the second polarization beam splitter 140a, the first polarization component 200a1 is reflected again by the second polarization beam splitter 140a and exits from the light output port 100b.

[0051] The second polarization component 200a2 (e.g., P-polarized light) passes through the first polarization beam splitter 120a and then through the magneto-optical crystal 130. After passing through the magneto-optical crystal 130, it retains its polarization direction and is reflected by the third reflecting surface 140b back to the second polarization beam splitter 140a. Since the second polarization beam splitter 140a transmits P-polarized light, the second polarization component 200a2 is transmitted and exits from the light output port 100b.

[0052] Thus, for reference Figure 10The first polarization component 200a1 and the second polarization component 200a2, which converge at the optical output port 100b, are combined into an output beam 200b, which is emitted from the optical output port 100b. This technical solution achieves the effect of the magneto-optical switch 100 being in the on state when the magnetic field generator 110 is powered off.

[0053] Specifically, refer to Figure 11 When the magnetic field generator 110 is energized, it applies a magnetic field to the magneto-optical crystal 130. In this state, the polarization directions of both the first polarization component 200a1 and the second polarization component 200a2 are rotated by 90 degrees after passing through the magneto-optical crystal 130 (e.g., S-polarized light becomes P-polarized light, and P-polarized light becomes S-polarized light). The first polarization component 200a1 (e.g., S-polarized light) is reflected by the first polarization beam splitter 120a to the second reflection surface 120b, and continues to be reflected by the second reflection surface 120b before passing through the magneto-optical crystal 130. After passing through the magneto-optical crystal 130, the polarization direction of the first polarization component 200a1 (e.g., S-polarized light) is rotated, for example, S-polarized light becomes P-polarized light. This P-polarized light is incident on the second polarization beam splitter 140a. Because the second polarization beam splitter 140a can transmit P-light, the changed first polarization component 200a1 is directly transmitted to the first reflection surface 150.

[0054] Please continue to refer to this. Figure 11 After the second polarization component 200a2 (e.g., P-polarized light) passes through the magneto-optical crystal 130, its polarization direction is also rotated, for example, the P-polarized light becomes S-polarized light. This S-polarized light first strikes the third reflecting surface 140b and is reflected by the third reflecting surface 140b to the second polarization beam-splitting surface 140a. Since the polarization state of the second polarization component 200a2 has changed from P-polarized light to S-polarized light at this time, and based on the fact that the second polarization beam-splitting surface 140a can reflect S-polarized light, the changed second polarization component 200a2 is reflected to the first reflecting surface 150.

[0055] Therefore, please refer to the following: Figure 12 The first polarization component 200a1 and the second polarization component 200a2, which converge at the first reflecting surface 150, are blocked and reflected by the first reflecting surface 150, causing them to return to the optical input port 100a along their original path. That is, the first polarization component 200a1 and the second polarization component 200a2 again pass through the second polarization beam splitter 140a and the magneto-optical crystal 130 respectively, and finally exit from the optical input port 100a after being combined by the first polarization beam splitter 120a, instead of exiting from the optical output port 100b. This technical solution achieves the effect of the magneto-optical switch 100 being in the off state when the magnetic field generator 110 is powered off.

[0056] In this second example, the first reflecting surface 150 is located on the side of the second polarizing beam splitter 140a away from the magneto-optical crystal 130, and the light output port 100b is located on the side of the second polarizing beam splitter 140a away from the third reflecting surface 140b. Please refer to [the original text here] for further details. Figure 10 From this, we can see that the incident direction F1 defined by the optical input port 100a in Example 2 intersects with the exit direction F2 defined by the optical output port 100b. Specifically, in... Figure 10 In Example 2 shown, the incident direction F1 defined by the optical input port 100a and the exit direction F2 defined by the optical output port 100b are perpendicular to each other. This technical solution allows for greater flexibility in the direction of light transmission.

[0057] In some embodiments, please refer to Figure 6 The first polarizing beam-splitting surface 120a and the second reflecting surface 120b are arranged parallel to and opposite to each other, and the second polarizing beam-splitting surface 140a and the third reflecting surface 140b are arranged parallel to and opposite to each other. This technical solution ensures stable light transmission. The parallel and opposite arrangement of the polarizing beam-splitting surface and the corresponding reflecting surface forms an optical cavity structure, effectively confining light transmission within the optical cavity and preventing light divergence.

[0058] For example, the first polarization component 200a1, which is reflected by the first polarization beam splitter 120a, is reflected by the parallel second reflection surface 120b, and the direction of its reflected light path transmission is parallel to the direction of the transmitted component.

[0059] More specifically, in order to improve optical transmission efficiency, the angle between the first polarization beam splitter 120a and the incident optical path in this embodiment is 45°. This enables the incident light 200a to be efficiently separated into a first polarization component 200a1 (S-polarized light) and a second polarization component 200a2 (P-polarized light), avoiding light crosstalk.

[0060] For a specific example, please refer to [link / reference]. Figure 6 With the first polarizing beam splitter 120a and the second reflecting surface 120b arranged parallel and opposite to each other, and the second polarizing beam splitter 140a and the third reflecting surface 140b arranged parallel and opposite to each other, the angle between the first polarizing beam splitter 120a and the incident light path is 45°. Using this technical solution, after the S-polarized light reflected and the P-polarized light transmitted by the first polarizing beam splitter 120a, the second reflecting surface 120b, the second polarizing beam splitter 140a, and the third reflecting surface 140b of the magneto-optical switch 100 are spatially separated, they can be guided to symmetrical positions of the next optical component (such as the second reflecting surface 120b and the magneto-optical crystal 130).

[0061] In some embodiments, continue to refer to Figure 3 and Figure 4 The first polarization beam splitter 120 includes a first body 121 and a first lens 122. The two opposite surfaces of the first body 121 serve as a first polarization beam splitter surface 120a and a second reflecting surface 120b, respectively. The first lens 122 is disposed between the first polarization beam splitter surface 120a and the magneto-optical crystal 130.

[0062] By placing a first lens 122 between the first polarization beam splitter 120a and the magneto-optical crystal 130, the transmission efficiency of the light beam can be improved.

[0063] For example, please continue to refer to Figure 4 In this embodiment, the first body 121 can be constructed as a rhomboid prism. The rhomboid prism includes two end faces and four side faces located between the two end faces, with adjacent side faces at a 45° angle. The four side faces are defined as a first side face 121a, a second side face 121b, a third side face 121c, and a fourth side face 121d. The first side face 121a and the third side face 121c are opposite each other, and the second side face 121b and the fourth side face 121d are opposite each other. The first side face 121a serves as a first polarizing beam-splitting surface 120a. The third side face 121c serves as a second reflecting surface 120b.

[0064] As a more specific technical solution, a polarizing beam-splitting film can be deposited on the first side surface 121a to achieve P-polarized light transmission and S-polarized light reflection. The third side surface 121c is polished to serve as the second reflecting surface 120b, achieving total internal reflection due to refractive index difference.

[0065] For example, the first lens 122 is a transparent glass mirror. As a more specific technical solution, the glass mirror can be an isosceles right-angled prism. This isosceles right-angled prism has an inclined plane with a corresponding hypotenuse and two right-angled faces with corresponding right-angled sides. One side of the rhomboid prism is connected to the inclined plane of the isosceles right-angled prism.

[0066] In some embodiments, please refer to Figure 3 The second polarization beam splitter 140 includes a second body 141 and a second lens 142. The two opposing surfaces of the second body 141 are a second polarization beam splitter surface 140a and a third reflecting surface 140b, respectively, and the second lens 142 is disposed between the third reflecting surface 140b and the magneto-optical crystal 130.

[0067] By placing a second lens 142 between the third polarization beam splitter and the magneto-optical crystal 130, the transmission efficiency of the beam can be improved.

[0068] Exemplarily, the second body 141 of this application embodiment can be constructed as a rhomboid prism. The rhomboid prism includes two opposing end faces and four side faces located between the two end faces, with adjacent side faces at a 45° angle. The four side faces are defined as the fifth side face 141a, the sixth side face 141b, the seventh side face 141c, and the eighth side face 141d. The fifth side face 141a and the seventh side face 141c are opposite each other, and the sixth side face 141b and the eighth side face 141d are opposite each other. The seventh side face 141c serves as the second polarizing beam-splitting surface 140a. The fifth side face 141a serves as the third reflecting surface 140b.

[0069] As a more specific technical solution, a polarizing beam-splitting film can be deposited on the seventh side surface 141c to achieve P-polarized light transmission and S-polarized light reflection. The fifth side surface 141a is polished to serve as the second reflecting surface 120b, achieving total internal reflection due to refractive index difference.

[0070] For example, the second lens 142 is a transparent glass mirror. As a more specific technical solution, the glass mirror can be an isosceles right-angled prism. This isosceles right-angled prism has an inclined plane with one corresponding hypotenuse and two right-angled faces with corresponding right-angled sides. One side of the rhombic prism is connected to the inclined plane of the isosceles right-angled prism.

[0071] As a specific example, in this embodiment of the application, the first body 121 and the second body 141 are configured with the same structure, for example, both the first body 121 and the second body 141 are configured as rhomboid prisms. As a specific example, the first lens 122 and the second lens 142 are configured with the same structure. For example, both the first lens 122 and the second lens 142 are configured as isosceles right-angled prisms.

[0072] It should be noted that when we say the first body 121 and the second body 141 are identical, we mean they are the same size. In a further technical solution, they could also be identical in both size and material.

[0073] Please continue to refer to this. Figure 4 and Figure 6 In the aforementioned Example 1, when the second body 141 is a rhomboid prism and the second lens 142 is an isosceles right-angled prism, the first right-angled surface of the second lens 142 is connected to the magneto-optical crystal 130, and the second right-angled surface serves as the first reflecting surface 150.

[0074] Continue to refer to Figure 4 and Figure 9 In the aforementioned Example 2, when the second body 141 is a rhomboid prism and the second lens 142 is an isosceles right-angled prism, the eighth side surface 141d included in the second body 141 is polished and serves as the first reflecting surface 150.

[0075] It should be noted that the first reflecting surface 150 in Examples 1 and 2 of this application embodiment can also be coated with a high-reflection film on the second lens 142 or the eighth side surface 141d, which can also achieve total internal reflection of the polarization component.

[0076] In some embodiments, the first lens 122 and the magneto-optical crystal 130 are bonded together by an optical adhesive layer. The second lens 142 and the magneto-optical crystal 130 are bonded together by an optical adhesive layer.

[0077] By connecting the lens and the magneto-optical crystal 130 with an optical adhesive layer, on the one hand, the air gap between the lens and the magneto-optical crystal 130 can be eliminated, reducing interface reflection as light passes through the lens, optical adhesive, and magneto-optical crystal 130 in sequence. On the other hand, it also improves the connection stability of the lens and magneto-optical crystal 130 as a module. Furthermore, the optical adhesive layer can effectively prevent moisture, dust, and other contaminants from entering the optical interface, protecting the polarization beam splitter and improving the reliability of the magneto-optical switch 100.

[0078] In some embodiments, continue to refer to Figure 6 The magneto-optical crystal 130 includes a first crystal section 131 and a second crystal section 132 spaced apart. The first crystal section 131 is located on the reflected light path of the second reflecting surface 120b, and the second crystal section 132 is located on the transmitted light path of the first polarization beam splitting surface 120a. By employing this technical solution, the magneto-optical crystal 130 utilizes a distributed arrangement, effectively splitting the function of a complete magneto-optical crystal 130 into two independent and spatially separated crystal sections, thus avoiding crosstalk between the first polarization component 200a1 and the second polarization component 200a2 within the magneto-optical crystal 130.

[0079] It is understood that the first crystal section 131 is located in the reflected light path of the second reflecting surface 120b. Specifically, the first crystal section 131 refers to the portion of the magneto-optical crystal 130 that enters and passes through after being reflected by the first polarization component 200a1 (e.g., S-polarized light) reflected by the first polarization beam splitter 120a and then reflected by the second reflecting surface 120b. The second crystal section 132 is located in the transmitted light path of the first polarization beam splitter 120a. Specifically, the second crystal section 132 refers to the portion of the magneto-optical crystal 130 that directly enters and passes through after being transmitted through the first polarization beam splitter 120a.

[0080] This technical solution physically separates the magneto-optical crystal 130 carrying different polarized light (S-polarized light and P-polarized light), preventing crosstalk between the two polarization components within the magneto-optical crystal 130. This ensures that the polarization state of each polarization component is controlled only by the applied magnetic field within its corresponding crystal section, and is not affected by the other component.

[0081] As a more specific technical solution, the first crystal portion 131 and the second crystal portion 132 are configured with the same structure. For example, please refer to... Figure 3 Both the first crystal section 131 and the second crystal section 132 can be cuboids of the same size, ensuring stable optical performance.

[0082] Please continue to refer to this. Figure 3 The first crystal unit 131 and the second crystal unit 132 can be arranged symmetrically about the optical system central axis 100c of the magneto-optical switch 100. This symmetry can ensure the synchronous polarization rotation of the two types of polarization components, in which the polarization direction is changed by the corresponding crystal unit.

[0083] Of course, in some other examples, the magneto-optical crystal 130 can also be configured as a monolithic crystal structure, without limitation.

[0084] In some embodiments, please refer to Figure 2 To further improve the compactness of the magneto-optical switch 100, the first crystal unit 131 and the second crystal unit 132 are located within the magnetic field of the same magnetic field generator 110. This technical solution allows one magnetic field generator 110 to act on both crystal units simultaneously, reducing the number of components and making the overall magneto-optical switch 100 more compact and smaller. Furthermore, using one magnetic field generator 110 to act on both crystal units simultaneously ensures that the polarization rotation states of the first polarization component 200a1 and the second polarization component 200a2 change simultaneously and to the same extent, guaranteeing consistency.

[0085] In other examples, two magnetic field generators 110 can also be provided. A first crystal unit 131 is disposed within the magnetic field of one magnetic field generator 110. A second crystal unit 132 is disposed within the magnetic field of the other magnetic field generator 110. By employing this technical solution, the first crystal unit 131 and the second crystal unit 132 can be independently controlled, compensating for subtle differences in the polarization direction of the polarization components between the different crystal units, and ensuring that the change in polarization state of the polarization components passing through the two crystal units tends to be completely consistent.

[0086] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A magneto-optical switch, characterized in that, The magneto-optical switch includes: Optical input port and optical output port; The first polarization beam splitter is used to split the incident light from the optical input port into a first polarization component and a second polarization component. A magneto-optical crystal is disposed in the output light path of the first polarization beam splitter and is used to change the polarization direction of the light passing through it under the action of a magnetic field. The second polarization beam splitter is disposed on the outgoing light path of the magneto-optical crystal; The first reflective surface and the light output port are located on different sides of the second polarization beam splitter; A magnetic field generator is used to apply or remove a magnetic field from the magneto-optical crystal; In one case, with or without a magnetic field applied, the first polarization component and the second polarization component are guided by the second polarization beam splitter to the optical output port for beam combining and emission. In another case, the first polarization component and the second polarization component are guided by the second polarization beam splitter to the first reflective surface, and after reflection, they sequentially pass through the second polarization beam splitter, the magneto-optical crystal, and the first polarization beam splitter back to the optical input port.

2. The magneto-optical switch according to claim 1, characterized in that, The first polarization beam splitter includes a first polarization beam splitting surface and a second reflecting surface; The first polarization beam-splitting surface is configured to reflect the first polarization component and transmit the second polarization component; The second reflecting surface is disposed opposite to the first polarization beam-splitting surface and configured to reflect the first polarization component to the magneto-optical crystal; The second polarization beam splitter includes a second polarization beam splitting surface and a third reflecting surface; The third reflecting surface and the first polarizing beam splitter are disposed on opposite sides of the magneto-optical crystal and configured to reflect the light emitted from the magneto-optical crystal to the second polarizing beam splitter. The second polarization beam-splitting surface and the second reflecting surface are disposed on opposite sides of the magneto-optical crystal and configured to reflect the first polarization component and transmit the second polarization component.

3. The magneto-optical switch according to claim 2, characterized in that, The optical output port is located on the side of the second polarization beam splitter away from the magneto-optical crystal; The first reflecting surface is located on the side of the second polarization beam-splitting surface that is away from the third reflecting surface; When the magnetic field generator does not apply a magnetic field to the magneto-optical crystal: The first polarization component retains its polarization direction after passing through the magneto-optical crystal and is reflected by the second polarization beam splitter to the first reflecting surface; the second polarization component retains its polarization direction after passing through the magneto-optical crystal and is reflected by the third reflecting surface to the second polarization beam splitter, and is transmitted through it to the first reflecting surface; the first reflecting surface reflects the first polarization component and the second polarization component, allowing them to return to the optical input port along their original paths; When the magnetic field generator applies a magnetic field to the magneto-optical crystal: The polarization direction of the first polarization component is rotated after passing through the magneto-optical crystal, transmitted through the second polarization beam splitter, and emitted from the light output port; the polarization direction of the second polarization component is rotated after passing through the magneto-optical crystal, reflected by the third reflector to the second polarization beam splitter, and reflected by it, and emitted from the light output port.

4. The magneto-optical switch according to claim 3, characterized in that, The incident direction defined by the optical input port is parallel to the exit direction defined by the optical output port.

5. The magneto-optical switch according to claim 2, characterized in that, The first reflecting surface is located on the side of the second polarization beam-splitting surface away from the magneto-optical crystal; The optical output port is located on the side of the second polarization beam splitter that is away from the third reflecting surface; When the magnetic field generator does not apply a magnetic field to the magneto-optical crystal: The first polarization component retains its polarization direction after passing through the magneto-optical crystal, is reflected by the second polarization beam splitter, and exits from the light output port; the second polarization component retains its polarization direction after passing through the magneto-optical crystal, is reflected by the third reflecting surface to the second polarization beam splitter, is transmitted through it, and exits from the light output port. When the magnetic field generator applies a magnetic field to the magneto-optical crystal: The polarization direction of the first polarization component is rotated after passing through the magneto-optical crystal, and it is transmitted to the first reflecting surface by the second polarization beam splitter; the polarization direction of the second polarization component is rotated after passing through the magneto-optical crystal, and it is reflected to the second polarization beam splitter by the third reflecting surface, and then reflected to the first reflecting surface. The first reflective surface reflects the first polarization component and the second polarization component, allowing them to return to the optical input port along their original path.

6. The magneto-optical switch according to claim 2, characterized in that, The first polarizing beam-splitting surface is parallel to and opposite to the second reflecting surface; and / or, The second polarization beam-splitting surface is parallel to and opposite to the third reflecting surface.

7. The magneto-optical switch according to claim 2, characterized in that, The first polarization beam splitter includes a first body and a first lens; the two opposite surfaces of the first body are the first polarization beam splitting surface and the second reflecting surface, respectively; the first lens is disposed between the first polarization beam splitting surface and the magneto-optical crystal; and / or, The second polarization beam splitter includes a second body and a second lens; the two opposing surfaces of the second body are the second polarization beam splitter surface and the third reflecting surface, respectively, and the second lens is disposed between the third reflecting surface and the magneto-optical crystal.

8. The magneto-optical switch according to claim 7, characterized in that, The first lens and the magneto-optical crystal are bonded together by an optical adhesive layer; And / or, The second lens and the magneto-optical crystal are bonded together by an optical adhesive layer.

9. The magneto-optical switch according to any one of claims 2 to 8, characterized in that, The magneto-optical crystal includes a first crystal portion and a second crystal portion spaced apart. The first crystal portion is located on the reflected light path of the second reflecting surface, and the second crystal portion is located on the transmitted light path of the first polarization beam splitting surface.

10. The magneto-optical switch according to claim 9, characterized in that, The first crystal portion and the second crystal portion are located within the same magnetic field of the magnetic field generator; or, The magnetic field generator is configured to have two components, with the first crystal part disposed within the magnetic field of one of the magnetic field generators and the second crystal part disposed within the magnetic field of the other magnetic field generator.

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