Multi-port magneto-optical switch device

Abstract

The utility model discloses a multi-port magneto-optical switch device, and relates to the technical field of optics, and the multi-port magneto-optical switch device comprises an input optical path structure, a switching structure, an output optical path structure, and a polarization switching unit. The input light path structure and the output light path structure are arranged on the two sides of the switching structure; a plurality of polarization switching units are arranged in a main light path formed by the input light path structure, the switching structure and the output light path structure. The output light path structure is further arranged on one side of the switching structure, after the polarization switching unit switches the polarization states of the light beams transmitted in the main light path, the light beams of different polarization states output to the output light path structure by the switching structure are transmitted along different light paths, and the output light path structure carries out light mixing on the light beams transmitted along the different light paths. And the plurality of single-path light beams are output to the corresponding output ports, so that the number of all-optical switching ports is increased, and a larger application scene can be realized in all-optical network switching.

Description

Technical Field

[0001] This application relates to the field of optical technologies, and particularly to a multi-port magneto-optical switch device. Background Art

[0002] Today, optical fiber communication not only develops rapidly towards high capacity and high speed, but also its applications have expanded from traditional transmission networks to access networks, from trunk systems to loop systems, from telecommunication networks to radio and television networks and computer networks, and into a practical all-optical communication network.

[0003] Currently, the magneto-optical switch used in optical fiber communication changes the polarization state of light by using a half-wave plate and a Faraday rotator crystal, and combines a switching structure composed of a birefringent crystal to split light and output it to corresponding output ports, thereby realizing the switching function of the optical switch. However, in the existing magneto-optical switch, a switching structure composed of a single birefringent crystal can only realize the switching of one optical path to two optical paths, and there are still certain limitations in the number of all-optical switching ports realized, and the application scenarios in all-optical network switching are limited.

[0004] The above content is only used to assist in understanding the technical solution of this application, and does not represent an admission that the above content is prior art. Summary of the Utility Model

[0005] The main purpose of this application is to provide a multi-port magneto-optical switch device, aiming to solve the technical problem that there are still certain limitations in the number of all-optical switching ports realized in the prior art, and the application scenarios in all-optical network switching are limited.

[0006] To achieve the above purpose, this application provides a multi-port magneto-optical switch device, which includes: an input optical path structure, a switching structure, an output optical path structure, and a polarization switching unit;

[0007] The input optical path structure and the output optical path structure are arranged on both sides of the switching structure;

[0008] The input optical path structure, the switching structure, and the output optical path structure form a main optical path;

[0009] Among them, a plurality of the polarization switching units are arranged in the main optical path;

[0010] The polarization switching unit is used to switch the polarization state of the light beam transmitted in the main optical path, so that the light beams with different polarization states output from the switching structure are transmitted along different optical paths;

[0011] The output optical path structure is used to combine the light beams transmitted along different optical paths to form multiple single-path light beams and then output them to corresponding output ports.

[0012] In one embodiment, the input optical path structure includes: an input polarization beam splitter prism and an input total reflection mirror;

[0013] The output optical path structure includes: a first output polarization beam splitter prism, a second output polarization beam splitter prism, a third output polarization beam splitter prism, a first output total reflection mirror, and a second output total reflection mirror;

[0014] The polarization switching unit includes: a first polarization switching unit, a second polarization switching unit, a third polarization switching unit, a fourth polarization switching unit, a fifth polarization switching unit, a sixth polarization switching unit, a seventh polarization switching unit, an eighth polarization switching unit, a ninth polarization switching unit, a tenth polarization switching unit, an eleventh polarization switching unit, and a twelfth polarization switching unit;

[0015] The input polarization beam splitter prism is connected to the input total reflection mirror;

[0016] The first output polarization beam splitter prism is disposed between the second output polarization beam splitter prism and the first output total reflection mirror;

[0017] The second output polarization beam splitter prism is connected to the second output total reflection mirror, and the first output total reflection mirror is connected to the third output polarization beam splitter prism;

[0018] The first polarization switching unit is disposed between the input total reflection mirror and the switching structure, and the second polarization switching unit is disposed between the input polarization beam splitter prism and the switching structure;

[0019] The third polarization switching unit and the fourth polarization switching unit are disposed between the second output polarization switching unit and the switching structure, and the fifth polarization switching unit and the sixth polarization switching unit are disposed between the first output polarization switching unit and the switching structure;

[0020] The seventh polarization switching unit and the eighth polarization switching unit are disposed between the second output total reflection mirror and the third output polarization beam splitter prism, the ninth polarization switching unit and the tenth polarization switching unit are disposed between the first output polarization beam splitter prism and the second output polarization beam splitter prism, and the eleventh polarization switching unit and the twelfth polarization switching unit are disposed between the first output polarization beam splitter prism and the first output total reflection mirror.

[0021] In one embodiment, the multi-port magneto-optical switch device further includes: an input collimator array;

[0022] The input collimator array is configured to convert an input beam into a parallel beam with an arbitrary polarization direction and output the parallel beam to the input polarization beam splitter prism;

[0023] The input polarization beam splitter prism is configured to split the parallel light beam into a horizontally polarized light and a vertically polarized light with perpendicular polarization directions;

[0024] The input polarization beam splitter prism is further configured to transmit the horizontally polarized light to the input total reflection mirror and reflect the vertically polarized light to the second polarization switching unit;

[0025] The input total reflection mirror is configured to reflect the horizontally polarized light to the first polarization switching unit.

[0026] In one embodiment, the first polarization switching unit is configured to output the horizontally polarized light to the switching structure, so that the horizontally polarized light is output to the third polarization switching unit along the first principal optical axis in the switching structure;

[0027] The third polarization switching unit is configured to convert the horizontally polarized light into a first light beam in a vertical polarization state and then output it to the second output polarization beam splitter prism, so that the first light beam is reflected by the second output polarization beam splitter prism to the tenth polarization switching unit;

[0028] The tenth polarization switching unit is configured to output the first light beam to the first output polarization beam splitter prism;

[0029] The second polarization switching unit is configured to convert the vertically polarized light into a second light beam in a horizontal polarization state and then output it to the switching structure, so that the second light beam is output to the fifth polarization switching unit along the second principal optical axis in the switching structure;

[0030] The fifth polarization switching unit is configured to output the second light beam to the first output polarization beam splitter prism;

[0031] The first output polarization beam splitter prism is configured to combine the first light beam and the second light beam to form a first single-path light beam and then output it to the first output port.

[0032] In one embodiment, the first polarization switching unit is further configured to convert the horizontally polarized light into a third light beam in a vertical polarization state and then output it to the switching structure, so that the third light beam is output to the fourth polarization switching unit along a first optical axis at a preset angle to the first principal optical axis in the switching structure;

[0033] The fourth polarization switching unit is configured to output the third light beam to the second output polarization beam splitter prism, so that the third light beam is reflected by the second output polarization beam splitter prism to the ninth polarization switching unit;

[0034] The ninth polarization switching unit is configured to output the third light beam to the first output polarization beam splitter prism;

[0035] The second polarization switching unit is further configured to output the vertically polarized light to the switching structure, so that the vertically polarized light is output to the sixth polarization switching unit along a second optical axis that forms the preset angle with the second main optical axis in the switching structure;

[0036] The sixth polarization switching unit is configured to convert the vertically polarized light into a fourth light beam in a horizontal polarization state and then output it to the first output polarization beam splitter prism;

[0037] The first output polarization beam splitter prism is further configured to combine the third light beam and the fourth light beam, form a second single-path light beam and then output it to a second output port.

[0038] In an embodiment, the first polarization switching unit is further configured to output the horizontally polarized light to the switching structure, so that the horizontally polarized light is output to the third polarization switching unit along a first main optical axis in the switching structure;

[0039] The third polarization switching unit is further configured to output the horizontally polarized light to the second output polarization beam splitter prism, so that the horizontally polarized light is reflected by the second output polarization beam splitter prism and the second output total reflection mirror to the eighth polarization switching unit;

[0040] The eighth polarization switching unit is configured to convert the horizontally polarized light into a fifth light beam in a vertical polarization state and then output it to the third output polarization beam splitter prism;

[0041] The second polarization switching unit is further configured to convert the vertically polarized light into a sixth light beam in a horizontal polarization state and then output it to the switching structure, so that the sixth light beam is output to the fifth polarization switching unit along a second main optical axis in the switching structure;

[0042] The fifth polarization switching unit is further configured to convert the sixth light beam into a seventh light beam in a vertical polarization state and then output it to the first output polarization beam splitter prism, so that the seventh light beam is reflected by the first output polarization beam splitter prism to the twelfth polarization switching unit;

[0043] The twelfth polarization switching unit is configured to convert the seventh light beam into an eighth light beam in a horizontal polarization state and then output it to the first output total reflection mirror, so that the eighth light beam is reflected by the first output total reflection mirror to the third output polarization beam splitter prism;

[0044] The third output polarization beam splitter prism is configured to combine the fifth light beam and the eighth light beam, form a third single-path light beam and then output it to a third output port.

[0045] In one embodiment, the first polarization switching unit is further configured to convert the horizontally polarized light into a ninth light beam with a vertical polarization state and then output it to the switching structure, so that the ninth light beam is output to the fourth polarization switching unit along a first optical axis that forms a preset angle with the first main optical axis in the switching structure;

[0046] The fourth polarization switching unit is further configured to convert the ninth light beam into a tenth light beam with a horizontal polarization state and then output it to the second output polarization beam splitter prism, so that the tenth light beam is reflected by the second output polarization beam splitter prism and the second output total reflection mirror to the seventh polarization switching unit;

[0047] The seventh polarization switching unit is configured to convert the tenth light beam into an eleventh light beam with a vertical polarization state and then output it to the third output polarization beam splitter prism;

[0048] The second polarization switching unit is further configured to output the vertically polarized light to the switching structure, so that the vertically polarized light is output to the sixth polarization switching unit along a second optical axis that forms the preset angle with the second main optical axis in the switching structure;

[0049] The sixth polarization switching unit is configured to output the vertically polarized light to the first output polarization beam splitter prism, so that the vertically polarized light is reflected by the first output polarization beam splitter prism to the eleventh polarization switching unit;

[0050] The eleventh polarization switching unit is configured to convert the vertically polarized light into a twelfth light beam with a horizontal polarization state and then output it to the first output total reflection mirror, so that the twelfth light beam is reflected by the first output total reflection mirror to the third output polarization beam splitter prism;

[0051] The third output polarization beam splitter prism is further configured to combine the eleventh light beam and the twelfth light beam to form a fourth single-channel light beam and then output it to the fourth output port.

[0052] In one embodiment, the first polarization switching unit is further configured to convert the horizontally polarized light into a thirteenth light beam with a vertical polarization state and then output it to the switching structure, so that the thirteenth light beam is output to the fourth polarization switching unit along a first optical axis that forms a preset angle with the first main optical axis in the switching structure;

[0053] The fourth polarization switching unit is further configured to convert the thirteenth light beam into a fourteenth light beam with a horizontal polarization state and then output it to the second output polarization beam splitter prism, so that the fourteenth light beam is reflected by the second output polarization beam splitter prism and the second output total reflection mirror to the seventh polarization switching unit;

[0054] The seventh polarization switching unit is further configured to output the fourteenth light beam to the third output polarization beam splitter prism;

[0055] The second polarization switching unit is further configured to output the vertically polarized light to the switching structure, so that the vertically polarized light is output to the sixth polarization switching unit along a second optical axis that forms the preset angle with the second main optical axis in the switching structure;

[0056] The sixth polarization switching unit is further configured to output the vertically polarized light to the first output polarization beam splitter prism, so that the vertically polarized light is reflected by the first output polarization beam splitter prism to the eleventh polarization switching unit;

[0057] The eleventh polarization switching unit is further configured to output the vertically polarized light to the first output total reflection mirror, so that the vertically polarized light is reflected by the first output total reflection mirror to the third output polarization beam splitter prism;

[0058] The third output polarization beam splitter prism is further configured to combine the fourteenth light beam and the vertically polarized light to form a fifth single-path light beam and output it to the fifth output port.

[0059] In an embodiment, the first polarization switching unit is further configured to output the horizontally polarized light to the switching structure, so that the horizontally polarized light is output to the third polarization switching unit along the first main optical axis in the switching structure;

[0060] The third polarization switching unit is further configured to output the horizontally polarized light to the second output polarization beam splitter prism, so that the horizontally polarized light is reflected by the second output polarization beam splitter prism and the second output total reflection mirror to the eighth polarization switching unit;

[0061] The eighth polarization switching unit is further configured to output the horizontally polarized light to the third output polarization beam splitter prism;

[0062] The second polarization switching unit is further configured to convert the vertically polarized light into a fifteenth light beam in a horizontal polarization state and output it to the switching structure, so that the fifteenth light beam is output to the fifth polarization switching unit along the second main optical axis in the switching structure;

[0063] The fifth polarization switching unit is further configured to convert the fifteenth light beam into a sixteenth light beam in a vertical polarization state and output it to the first output polarization beam splitter prism, so that the sixteenth light beam is reflected by the first output polarization beam splitter prism to the twelfth polarization switching unit;

[0064] The twelfth polarization switching unit is further configured to output the sixteenth light beam to the first output total reflection mirror, so that the sixteenth light beam is reflected by the first output total reflection mirror to the third output polarization beam splitter prism;

[0065] The third output polarization beam splitter prism is further configured to combine the horizontally polarized light and the sixteenth light beam, and output the combined light as a sixth single-path light beam to the sixth output port.

[0066] In one embodiment, the switching structure includes: a plurality of birefringent crystals.

[0067] The multi-port magneto-optical switch device provided in this application includes: an input optical path structure, a switching structure, an output optical path structure, and a polarization switching unit; the input optical path structure and the output optical path structure are arranged on both sides of the switching structure; the main optical path formed by the input optical path structure, the switching structure, and the output optical path structure; and a plurality of polarization switching units are provided in the main optical path. Compared with the switching structure of the existing magneto-optical switch that directly outputs the light beam to the corresponding output port after beam splitting, this application further provides an output optical path structure on the output side of the switching structure. After the polarization switching unit switches the polarization state of the light beam transmitted in the main optical path, the light beams with different polarization states output by the switching structure to the output optical path structure are transmitted along different optical paths, thereby realizing the re-beam splitting of the light beam output by the switching structure. By combining the light beams transmitted along different optical paths through the output optical path structure to form multiple single-path light beams and outputting them to the corresponding output ports, multiple single-path light beams can be formed again on the basis of the light beam output by the switching structure, effectively increasing the number of all-optical switching ports achieved and enabling a larger application scenario in all-optical network switching. Description of the Drawings

[0068] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0069] Figure 1 It is a schematic structural diagram of the first embodiment of the multi-port magneto-optical switch device of this application;

[0070] Figure 2 It is a schematic structural diagram of the second embodiment of the multi-port magneto-optical switch device of this application;

[0071] Figure 3 It is a schematic structural diagram of the first optical path in the third embodiment of the multi-port magneto-optical switch device of this application;

[0072] Figure 4 It is a schematic structural diagram of the second optical path in the third embodiment of the multi-port magneto-optical switch device of this application;

[0073] Figure 5It is a schematic structural diagram of optical path three in the third embodiment of the multi-port magneto-optical switch device of the present application;

[0074] Figure 6 It is a schematic structural diagram of optical path four in the third embodiment of the multi-port magneto-optical switch device of the present application;

[0075] Figure 7 It is a schematic structural diagram of optical path five in the third embodiment of the multi-port magneto-optical switch device of the present application;

[0076] Figure 8 It is a schematic structural diagram of optical path six in the third embodiment of the multi-port magneto-optical switch device of the present application;

[0077] Figure 9 It is a schematic structural diagram of the extended optical path of the third embodiment of the multi-port magneto-optical switch device of the present application.

[0078] The realization of the purpose of the present application, functional features and advantages will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0079] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0080] For a better understanding of the technical solutions of the present application, the following will be described in detail with reference to the accompanying drawings of the specification and specific implementation manners.

[0081] The present application provides a multi-port magneto-optical switch device, referring to Figure 1 , Figure 1 It is a schematic structural diagram of the first embodiment of the multi-port magneto-optical switch device of the present application.

[0082] In this embodiment, the multi-port magneto-optical switch device includes: an input optical path structure 11, a switching structure 12, an output optical path structure 13, and a polarization switching unit.

[0083] It should be noted that the above switching structure 12 includes a plurality of birefringent crystals. The birefringent crystal can be a crystal that generates two refracted light beams when light waves are projected onto its crystal interface, that is, the birefringent crystal can change the exit angle of the light beam input thereto.

[0084] The input optical path structure 11 and the output optical path structure 13 are arranged on both sides of the switching structure 12.

[0085] The input optical path structure 11, the switching structure 12, and the output optical path structure 13 form a main optical path.

[0086] Among them, a plurality of the polarization switching units are provided in the main optical path.

[0087] It should be noted that the above input optical path structure 11 can be the input part of the light beam, and the above output optical path structure 13 can be the output part of the light beam. The input optical path structure 11 and the output optical path structure 13 are arranged on two opposite sides of the switching structure 12, so that the light beam output by the input optical path structure 11 can pass through the switching structure 12 and be output to the output optical path structure 13, thereby forming the main optical path.

[0088] The polarization switching unit is used to switch the polarization state of the light beam transmitted in the main optical path, so that the light beams with different polarization states output from the switching structure 12 to the output optical path structure 13 are transmitted along different optical paths.

[0089] It should be noted that the above polarization switching unit can be an element that changes the polarization state of the light beam. Specifically, it can be an element composed of a combination of a Faraday rotor and a wave plate. The Faraday rotor in the polarization switching unit can achieve nanosecond-level switching of the polarization state of the light beam based on the Faraday rotation effect.

[0090] It can be understood that each polarization switching unit can be arranged in the above main optical path. Specifically, several polarization switching units can be arranged between the input optical path structure 11 and the switching structure 12 to form a first-stage switching optical path; several polarization switching units can be arranged between the switching structure 12 and the output optical path structure 13 to form a second-stage switching optical path; polarization switching units can also be arranged inside the output optical path structure 13 to form a third-stage switching optical path. The optical paths formed by the polarization switching units can switch the polarization states of the light beams at various positions in the main optical path.

[0091] The output optical path structure 13 is used to combine the light beams transmitted along different optical paths to form multiple single-path light beams and then output them to the corresponding output ports.

[0092] In a specific implementation, when an external magnetic field is applied to any polarization switching unit in each stage of the switching optical path, the polarization switching unit can rotate the polarization state of the light beam received in the main optical path by 90°, switching the horizontally polarized light beam to a vertically polarized light beam, or switching the vertically polarized light beam to a horizontally polarized light beam. External magnetic fields can also not be added to any deflection switching units in each stage of the switching optical path, and the polarization state of the light beam remains unchanged. The external magnetic field can be controlled by current through electromagnetic effects.

[0093] When the switching structure 12 outputs the light beam to the output optical path structure 13, the output optical path structure 13 can adjust the transmission path of the light beam in the horizontal polarization state or the vertical polarization state, so that the light beams in different polarization states are transmitted along different optical paths, realizing the splitting of the optical path output from the switching structure 12. The output optical path structure 13 can also combine the light beams in different optical paths. Specifically, it can combine a group of light beams in the horizontal polarization state and the vertical polarization state to form a single-path light beam and output it to the corresponding output port. By combining the light beams in different optical paths, that is, outputting the light beams to different ports, the multi-port optical switch switching is realized. Among them, the above output port can be an output collimator array, which is used to convert the light beams in the same path and different polarization states into parallel light beams for the convenience of the transmission and processing of optical signals.

[0094] The multi-port magneto-optical switch device of this embodiment includes: an input optical path structure, a switching structure, an output optical path structure, and a polarization switching unit; the input optical path structure and the output optical path structure are arranged on both sides of the switching structure; the main optical path formed by the input optical path structure, the switching structure, and the output optical path structure; and a plurality of polarization switching units are arranged in the main optical path. Compared with the switching structure of the existing magneto-optical switch that directly outputs the light beam to the corresponding output port after splitting the light, in this embodiment, an output optical path structure is further provided on the output side of the switching structure. After the polarization switching unit switches the polarization state of the light beam transmitted in the main optical path, the light beams in different polarization states output from the switching structure to the output optical path structure are transmitted along different optical paths, thus realizing the splitting of the light beam output from the switching structure again. By combining the light beams transmitted along different optical paths through the output optical path structure to form multiple single-path light beams and then outputting them to the corresponding output ports, multiple single-path light beams can be formed again on the basis of the light beam output from the switching structure, effectively increasing the number of all-optical switching ports realized and having a larger application scenario in all-optical network switching.

[0095] Based on the first embodiment of the present application, the second embodiment of the present application is proposed. In the second embodiment of the present application, please refer to Figure 2 , Figure 2 which is the structural schematic diagram of the second embodiment of the multi-port magneto-optical switch device of the present application.

[0096] In this embodiment, a single birefringent crystal is used to illustrate the switching structure 12. Specifically, the input optical path structure 11 includes: an input polarization beam splitter prism 101 and an input total reflection mirror 102.

[0097] The output optical path structure 13 includes: a first output polarization beam splitter prism 103, a second output polarization beam splitter prism 104, a third output polarization beam splitter prism 105, a first output total reflection mirror 106, and a second output total reflection mirror 107;

[0098] The polarization switching unit includes: a first polarization switching unit F1, a second polarization switching unit F2, a third polarization switching unit F3, a fourth polarization switching unit F4, a fifth polarization switching unit F5, a sixth polarization switching unit F6, a seventh polarization switching unit F7, an eighth polarization switching unit F8, a ninth polarization switching unit F9, a tenth polarization switching unit F10, an eleventh polarization switching unit F11, and a twelfth polarization switching unit F12.

[0099] The input polarization beam splitter prism 101 is connected to the input total reflection mirror 102.

[0100] The first output polarization beam splitter prism 103 is disposed between the second output polarization beam splitter prism 104 and the first output total reflection mirror 106.

[0101] The second output polarization beam splitter prism 104 is connected to the second output total reflection mirror 107, and the first output total reflection mirror 106 is connected to the third output polarization beam splitter prism 105.

[0102] The first polarization switching unit F1 is disposed between the input total reflection mirror 102 and the switching structure 12, and the second polarization switching unit F2 is disposed between the input polarization beam splitter prism 101 and the switching structure 12.

[0103] The third polarization switching unit F3 and the fourth polarization switching unit F4 are disposed between the second output polarization beam splitter prism 104 and the switching structure 12, and the fifth polarization switching unit F5 and the sixth polarization switching unit F6 are disposed between the first output polarization beam splitter prism 103 and the switching structure 12.

[0104] The seventh polarization switching unit F7 and the eighth polarization switching unit F8 are disposed between the second output total reflection mirror 107 and the third output polarization beam splitter prism 105, the ninth polarization switching unit F9 and the tenth polarization switching unit F10 are disposed between the first output polarization beam splitter prism 103 and the second output polarization beam splitter prism 104, and the eleventh polarization switching unit F11 and the twelfth polarization switching unit F12 are disposed between the first output polarization beam splitter prism 103 and the first output total reflection mirror 106.

[0105] It should be noted that the input total reflection mirror 102, the first output total reflection mirror 106, and the second output total reflection mirror 107 use the total reflection principle to deflect the light beam by 45°.

[0106] It is understandable that the input polarization beam splitter prism 101, the first output polarization beam splitter prism 103, the second output polarization beam splitter prism 104, and the third output polarization beam splitter prism 105 are all coated with polarization beam splitting films, allowing the beam with a horizontal polarization state to transmit and the beam with a vertical polarization state to reflect.

[0107] Furthermore, the input beam structure 11 composed of the input polarization beam splitter prism 101 and the input total reflection mirror 102 can divide the input light into two parts with mutually perpendicular polarization states. The output optical path structure 13 composed of the first output polarization beam splitter prism 103, the second output polarization beam splitter prism 104, the third output polarization beam splitter prism 105, the first output total reflection mirror 106, and the second output total reflection mirror 107 can combine the beams with different polarization states and then transmit the single-path beam to the corresponding output port (i.e., the output collimator array).

[0108] It should be noted that the exit angles of the beams with different polarization states in the switching structure 12 (i.e., the birefringent crystal) are different, and the switching of the beam position can be achieved by changing the polarization state of the incident light on the switching structure 12.

[0109] It is understandable that when using 1 birefringent crystal as the switching structure 12, a first-level switching structure can be formed. Under the first-level switching structure, the optical path can achieve 1-port input and 6-arbitrary-port output.

[0110] Specifically, the incident light output from the incident port is separated by the input polarization beam splitter prism 101 and the input total reflection mirror 102 into two beams with mutually perpendicular polarization states. The polarization state is changed by the first-level polarization switching unit composed of the first polarization switching unit F1 and the second polarization switching unit F2. The paths of the beams with different polarization states are separated by the switching structure 12. The polarization state is changed again by the second-level polarization switching unit composed of the third polarization switching unit F3, the fourth polarization switching unit F4, the fifth polarization switching unit F5, and the sixth polarization switching unit F6. The third polarization state switching is performed by the third-level polarization switching unit composed of the seventh polarization switching unit F7, the eighth polarization switching unit F8, the ninth polarization switching unit F9, the tenth polarization switching unit F10, the eleventh polarization switching unit F11, and the twelfth polarization switching unit F12 in the output optical path structure 13. Finally, the separated beams with different paths are combined by the first output polarization beam splitter prism 103, the second output polarization beam splitter prism 104, the third output polarization beam splitter prism 105, the first output total reflection mirror 106, and the second output total reflection mirror 107 in the output optical path structure 13 to reach the output port.

[0111] Among them, Figure 2The input port therein may be an input collimator array Ch1, and the six output ports are successively a first output port Ch2, a second output port Ch3, a third output port Ch4, a fourth output port Ch5, a fifth output port Ch6, and a sixth output port Ch6.

[0112] It should be noted that a first-level switching structure composed of one birefringent crystal can, through the switching of the polarization state of the light beam by each polarization switching unit, achieve the switching of one optical path to any one of six optical paths through the first-level switching structure, and further achieve the function of Figure 2 as shown in the figure, with input from port 1 and arbitrary output from six ports. Based on this, when using a second-level switching structure composed of two birefringent crystals, the switching of one optical path to twelve optical paths can be realized, and further the function of input from port 1 and arbitrary output from twelve ports can be realized. And so on, by splitting the light through birefringent crystals, an optical switch with 1×(3×2 n ) can be realized, where n is the number of birefringent crystals. Compared with the existing magneto-optical switch with 1×2 n optical switch switching, the all-optical switching ports that can be realized in this embodiment are more, and since the output ports can be arranged in various directions of the output optical path structure 13, compared with the direct-through structure of the existing magneto-optical switch, the space structure of this embodiment is more compact and the integration degree is higher.

[0113] Based on the second embodiment of the present application, a third embodiment of the present application is proposed. In the third embodiment of the present application, the multi-port magneto-optical switch device further includes: an input collimator array Ch1.

[0114] The input collimator array Ch1 is used to convert the input light beam into a parallel light beam with an arbitrary polarization direction and output the parallel light beam to the input polarization beam splitter prism 101.

[0115] The input polarization beam splitter prism 101 is used to decompose the parallel light beam into a horizontally polarized light and a vertically polarized light with perpendicular polarization directions.

[0116] The input polarization beam splitter prism 101 is further used to transmit the horizontally polarized light to the input total reflection mirror 102 and reflect the vertically polarized light to the second polarization switching unit F2.

[0117] The input total reflection mirror 102 is used to reflect the horizontally polarized light to the first polarization switching unit F1.

[0118] In a specific implementation, after the input light beam is output to the input collimator array Ch1, the input collimator array Ch1 can convert the input light beam into a parallel light beam with an arbitrary polarization direction. This parallel light beam enters the input polarization beam splitter prism 101 and is decomposed into two horizontally polarized light P and vertically polarized light S with perpendicular polarization directions. The horizontally polarized light P is the initial light beam in the horizontal polarization state, and the vertically polarized light S is the initial light beam in the vertical polarization state. Among them, the horizontally polarized light P is transmitted through the input polarization beam splitter prism 101 and enters the input total reflection mirror 102, and the vertically polarized light S is reflected by the input polarization beam splitter prism 101 and enters the second polarization switching unit F2.

[0119] Referring to Figure 3 , Figure 3 is a schematic structural diagram of optical path 1 in the third embodiment of the multi-port magneto-optical switch device of this application.

[0120] As Figure 3 shown, the first polarization switching unit F1 is used to output the horizontally polarized light P to the switching structure 12, so that the horizontally polarized light P is output to the third polarization switching unit F3 along the first main optical axis in the switching structure 12.

[0121] The third polarization switching unit F3 is used to convert the horizontally polarized light P into a first light beam S11 in the vertical polarization state and then output it to the second output polarization beam splitter prism 104, so that the first light beam S11 is reflected by the second output polarization beam splitter prism 104 to the tenth polarization switching unit F10.

[0122] The tenth polarization switching unit F10 is used to output the first light beam S11 to the first output polarization beam splitter prism 103.

[0123] The second polarization switching unit F2 is used to convert the vertically polarized light S into a second light beam P21 in the horizontal polarization state and then output it to the switching structure 12, so that the second light beam P21 is output to the fifth polarization switching unit F5 along the second main optical axis in the switching structure 12.

[0124] The fifth polarization switching unit F5 is used to output the second light beam P21 to the first output polarization beam splitter prism 103.

[0125] The first output polarization beam splitter prism 103 is used to combine the first light beam S11 and the second light beam P21 to form a first single-path light beam and then output it to the first output port Ch2.

[0126] It should be noted that the direction of the above first main optical axis can be from the first polarization switching unit F1 to the third polarization switching unit F3, and the direction of the second main optical axis can be from the second polarization switching unit F2 to the fifth polarization switching unit F5.

[0127] In a specific implementation, for optical path 1, the horizontally polarized light P passes through the input total reflection mirror 102 and reaches the first polarization switching unit F1. The first polarization switching unit F1 does not apply a magnetic field, and the horizontally polarized light P maintains its horizontal polarization state and enters the switching structure 12. The horizontally polarized light P travels along the first main optical axis in the switching structure 12 and reaches the third polarization switching unit F3. At this time, the third polarization switching unit F3 applies a magnetic field to rotate the polarization state of the light beam by 90°, changing the horizontally polarized light P into the first light beam S11 with a vertical polarization state. The first light beam S11 reaches the second output polarization beam splitter 104. In the second output polarization beam splitter 104, the first light beam S11 is reflected and enters the tenth polarization switching unit F10. The tenth polarization switching unit F10 does not apply a magnetic field, and the first light beam S11 maintains its vertical polarization state and is reflected after reaching the first output polarization beam splitter 103.

[0128] For the other vertically polarized light S, it is reflected by the input polarization beam splitter 101 and reaches the second polarization switching unit F2. At this time, the second polarization switching unit F2 applies a magnetic field to rotate the polarization state of the light beam by 90°, changing the vertically polarized light S into the second light beam P21 with a horizontal polarization state. The second light beam P21 enters the switching structure 12 and travels along the second main optical axis in the switching structure 12 and reaches the fifth polarization switching unit F5. The fifth polarization switching unit F5 does not apply a magnetic field, and the second light beam P21 is transmitted after reaching the first output polarization beam splitter 103. In the first output polarization beam splitter 103, the reflected first light beam S11 and the transmitted second light beam P21 are combined and reach the first output port Ch2.

[0129] Refer to Figure 4 , Figure 4 This is the schematic structural diagram of optical path 2 in the third embodiment of the multi-port magneto-optical switch device of the present application.

[0130] As Figure 4 shown, the first polarization switching unit F1 is further configured to convert the horizontally polarized light P into a third light beam S12 with a vertical polarization state and output it to the switching structure 12, so that the third light beam S12 is output to the fourth polarization switching unit F4 along a first optical axis that forms a preset angle with the first main optical axis in the switching structure 12.

[0131] The fourth polarization switching unit F4 is configured to output the third light beam S12 to the second output polarization beam splitter 104, so that the third light beam S12 is reflected by the second output polarization beam splitter 104 to the ninth polarization switching unit F9.

[0132] The ninth polarization switching unit F9 is configured to output the third light beam S12 to the first output polarization beam splitter 103.

[0133] The second polarization switching unit F2 is further configured to output the vertical polarized light S to the switching structure 12, so that the vertical polarized light S is output to the sixth polarization switching unit F6 along a second optical axis that forms the preset angle with the second main optical axis in the switching structure.

[0134] The sixth polarization switching unit F6 is configured to convert the vertical polarized light S into a fourth light beam P22 in a horizontal polarization state and then output it to the first output polarization beam splitter 103.

[0135] The first output polarization beam splitter 103 is further configured to combine the third light beam S12 and the fourth light beam P22, form a second single-path light beam and then output it to the second output port Ch3.

[0136] It should be noted that the direction of the first optical axis described above can be from the first polarization switching unit F1 to the fourth polarization switching unit F4, and the direction of the second optical axis can be from the second polarization switching unit F2 to the sixth polarization switching unit F6. The angle formed by the direction of the first optical axis and the direction of the first main optical axis, and the angle formed by the direction of the second optical axis and the direction of the second main optical axis are both the preset angle.

[0137] In a specific implementation, for optical path two, the horizontally polarized light P light reaches the first polarization switching unit F1 through the input total reflection mirror 102. At this time, the first polarization switching unit F1 adds a magnetic field to rotate the polarization state of the light beam by 90°, changing the horizontally polarized light P into a third light beam S12 in a vertical polarization state. The third light beam S12 enters the switching structure 12 and exits along a first optical axis that forms a preset angle with the first main optical axis in the switching structure. After passing through the switching structure 12, the exit angle is changed and it reaches the fourth polarization switching unit F4. The fourth polarization switching unit F4 does not add a magnetic field, and the third light beam S12 maintains its vertical polarization state and enters the second output polarization beam splitter 104. In the second output polarization beam splitter 104, the third light beam S12 is reflected and enters the ninth polarization switching unit F9. The ninth polarization switching unit F9 does not add a magnetic field, and the third light beam S12 maintains its vertical polarization state and is reflected after reaching the first output polarization beam splitter 103.

[0138] Another vertically polarized light beam, the S light, is reflected by the input polarization beam splitter prism 101 and reaches the second polarization switching unit F2. The second polarization switching unit F2 does not apply a magnetic field, and the vertically polarized S light maintains its vertical polarization state and enters the switching structure 12. In the switching structure 12, it exits along a second optical axis that forms a preset angle with the second main optical axis, and after the exit angle is changed by the switching structure 12, it reaches the sixth polarization switching unit F6. At this time, the sixth polarization switching unit F6 applies a magnetic field to rotate the polarization state of the light beam by 90°, changing the vertically polarized S light into a horizontally polarized fourth light beam P22. The fourth light beam P22 maintains its horizontal polarization state and is transmitted after entering the first output polarization beam splitter prism 103. In the first output polarization beam splitter prism 103, the reflected third light beam S12 and the transmitted fourth light beam P22 are combined and reach the second output port Ch3.

[0139] Refer to Figure 5 , Figure 5 which is a schematic structural diagram of the third optical path in the multi-port magneto-optical switch device of this application.

[0140] As Figure 5 shown, the first polarization switching unit F1 is further configured to output the horizontally polarized light P to the switching structure 12, so that the horizontally polarized light P exits along the first main optical axis in the switching structure and reaches the third polarization switching unit F3.

[0141] The third polarization switching unit F3 is further configured to output the horizontally polarized light P to the second output polarization beam splitter prism 104, so that the horizontally polarized light P is reflected by the second output polarization beam splitter prism 104 and the second output total reflection mirror 107 and reaches the eighth polarization switching unit F8.

[0142] The eighth polarization switching unit F8 is configured to convert the horizontally polarized light P into a vertically polarized fifth light beam S313 and then output it to the third output polarization beam splitter prism 105.

[0143] The second polarization switching unit F2 is further configured to convert the vertically polarized light S into a horizontally polarized sixth light beam P2 and then output it to the switching structure 12, so that the sixth light beam P2 exits along the second main optical axis in the switching structure 12 and reaches the fifth polarization switching unit F5.

[0144] The fifth polarization switching unit F5 is further configured to convert the sixth light beam P2 into a vertically polarized seventh light beam S21 and then output it to the first output polarization beam splitter prism 103, so that the seventh light beam S21 is reflected by the first output polarization beam splitter prism 103 and reaches the twelfth polarization switching unit F12.

[0145] The twelfth polarization switching unit F12 is configured to convert the seventh light beam S21 into an eighth light beam P321 in a horizontal polarization state and output it to the first output total reflection mirror 106, so that the eighth light beam P321 is reflected by the first output total reflection mirror 106 to the third output polarization beam splitter 105.

[0146] The third output polarization beam splitter 105 is configured to combine the fifth light beam S313 and the eighth light beam P321, form a third single-path light beam and output it to the third output port Ch4.

[0147] In a specific implementation, for optical path three, the horizontally polarized P light reaches the first polarization switching unit F1 through the input total reflection mirror 102. The first polarization switching unit F1 does not apply a magnetic field, and the horizontally polarized P light remains in the horizontal polarization state and enters the switching structure 12. It travels along the first main optical axis in the switching structure 12 and reaches the third polarization switching unit F3. The third polarization switching unit F3 does not apply a magnetic field, and the horizontally polarized P light remains in the horizontal polarization state and enters the second output polarization beam splitter 104, then transmits through it and enters the second output total reflection mirror 107. After being reflected by the second output total reflection mirror 107, it reaches the eighth polarization switching unit F8. At this time, the eighth polarization switching unit F8 applies a magnetic field to rotate the polarization state of the light beam by 90°, changing the horizontally polarized P light into a fifth light beam S313 in a vertical polarization state. The fifth light beam S313 in the vertical polarization state is reflected after reaching the third output polarization beam splitter 105.

[0148] Another vertically polarized S light is reflected by the input polarization beam splitter 101 and reaches the second polarization switching unit F2. At this time, the second polarization switching unit F2 applies a magnetic field to rotate the polarization state of the light beam by 90°, changing the vertically polarized S light into a sixth light beam P2 in a horizontal polarization state. The sixth light beam P2 travels along the first main optical axis in the switching structure 12 and reaches the fifth polarization switching unit F5. At this time, the fifth polarization switching unit F5 applies a magnetic field to rotate the polarization state of the light beam by 90°, changing the sixth light beam P2 into a seventh light beam S21 in a vertical polarization state and then enters the first output polarization beam splitter 103. In the first output polarization beam splitter 103, the seventh light beam S21 is reflected and reaches the twelfth polarization switching unit F12. At this time, the twelfth polarization switching unit F12 applies a magnetic field to rotate the polarization state of the light beam by 90°, changing the seventh light beam S21 into an eighth light beam P321 in a horizontal polarization state. The eighth light beam P321 is reflected after reaching the first output total reflection mirror 106 and enters the third output polarization beam splitter 105 for transmission. In the third output polarization beam splitter 105, the reflected fifth light beam S313 and the transmitted eighth light beam P321 are combined and reach the third output port Ch4.

[0149] Refer to Figure 6 , Figure 6This is a schematic diagram of the optical path four in the third embodiment of the multi-port magneto-optical switch device of the present application.

[0150] As Figure 6 shown, the first polarization switching unit F1 is further configured to convert the horizontally polarized light P into a ninth light beam S1 in a vertical polarization state and output it to the switching structure 12, so that the ninth light beam S1 is output to the fourth polarization switching unit F4 along a first optical axis at a preset angle with the first main optical axis in the switching structure 12.

[0151] The fourth polarization switching unit F4 is further configured to convert the ninth light beam S1 into a tenth light beam P12 in a horizontal polarization state and output it to the second output polarization beam splitter prism 104, so that the tenth light beam P12 is reflected by the second output polarization beam splitter prism 104 and the second output total reflection mirror 107 to the seventh polarization switching unit F7.

[0152] The seventh polarization switching unit F7 is configured to convert the tenth light beam P12 into an eleventh light beam S314 in a vertical polarization state and output it to the third output polarization beam splitter prism 105.

[0153] The second polarization switching unit F2 is further configured to output the vertically polarized light S to the switching structure 12, so that the vertically polarized light S is output to the sixth polarization switching unit F6 along a second optical axis at the preset angle with the second main optical axis in the switching structure 12.

[0154] The sixth polarization switching unit F6 is configured to output the vertically polarized light S to the first output polarization beam splitter prism 103, so that the vertically polarized light S is reflected by the first output polarization beam splitter prism 103 to the eleventh polarization switching unit F11.

[0155] The eleventh polarization switching unit F11 is configured to convert the vertically polarized light S into a twelfth light beam P322 in a horizontal polarization state and output it to the first output total reflection mirror 106, so that the twelfth light beam P322 is reflected by the first output total reflection mirror 106 to the third output polarization beam splitter prism 105.

[0156] The third output polarization beam splitter prism 105 is further configured to perform beam combination on the eleventh light beam S314 and the twelfth light beam P322 to form a fourth single-channel light beam and output it to the fourth output port Ch5.

[0157] In a specific implementation, for optical path four, the horizontally polarized light P passes through the input total reflection mirror 102 and reaches the first polarization switching unit F1. At this time, the first polarization switching unit F1 applies a magnetic field to rotate the polarization state of the light beam by 90°, changing the horizontally polarized light P into the ninth light beam S1 with a vertical polarization state. The ninth light beam S1 enters the switching structure 12 and exits along the first optical axis at a preset angle with respect to the first main optical axis in the switching structure 12. After the exit angle is changed by the switching structure 12, it reaches the fourth polarization switching unit F4. At this time, the fourth polarization switching unit F4 applies a magnetic field to rotate the polarization state of the light beam by 90°, changing the ninth light beam S1 into the tenth light beam P12 with a horizontal polarization state. The tenth light beam P12 enters the second output polarization beam splitter 104 while maintaining the horizontal polarization state, is transmitted into the second output total reflection mirror 107, and reaches the seventh polarization switching unit F7 after being reflected by the second output total reflection mirror 107. At this time, the seventh polarization switching unit F7 applies a magnetic field to rotate the polarization state of the light beam by 90°, changing the tenth light beam P12 into the eleventh light beam S314 with a vertical polarization state and then reaching the third output polarization beam splitter 105 for reflection.

[0158] Another vertically polarized light S is reflected by the input polarization beam splitter 101 and reaches the second polarization switching unit F2. The second polarization switching unit F2 does not apply a magnetic field, and the light beam maintains the vertical polarization state and enters the switching structure 12. It exits along the second optical axis at a preset angle with respect to the second main optical axis in the switching structure 12. After the exit angle is changed by the switching structure 12, it reaches the sixth polarization switching unit F6. The sixth polarization switching unit F6 does not apply a magnetic field, and the vertically polarized light S maintains the vertical polarization state and enters the first output polarization beam splitter 103, is reflected and reaches the eleventh polarization switching unit F11. At this time, the eleventh polarization switching unit F11 applies a magnetic field to rotate the polarization state of the light beam by 90°, changing the vertically polarized light S into the twelfth light beam P322 with a horizontal polarization state. The twelfth light beam P322 is reflected by the first output total reflection mirror 106 and then transmitted after reaching the third output polarization beam splitter 105. In the third output polarization beam splitter 105, the reflected eleventh light beam S314 and the transmitted twelfth light beam P322 are combined and reach the fourth output port Ch5.

[0159] Refer to Figure 7 , Figure 7 which is a schematic structural diagram of optical path five in the third embodiment of the multi-port magneto-optical switch device of the present application.

[0160] As Figure 7 shown, the first polarization switching unit F1 is further configured to convert the horizontally polarized light P into the thirteenth light beam S2 with a vertical polarization state and then output it to the switching structure 12, so that the thirteenth light beam S2 exits along the first optical axis at a preset angle with respect to the first main optical axis in the switching structure 12 and reaches the fourth polarization switching unit F4.

[0161] The fourth polarization switching unit F4 is further configured to convert the thirteenth light beam S2 into a fourteenth light beam P13 in a horizontal polarization state and output the fourteenth light beam P13 to the second output polarization beam splitter 104, so that the fourteenth light beam P13 is reflected by the second output polarization beam splitter 104 and the second output total reflection mirror 107 to the seventh polarization switching unit F7.

[0162] The seventh polarization switching unit F7 is further configured to output the fourteenth light beam P13 to the third output polarization beam splitter 105.

[0163] The second polarization switching unit F2 is further configured to output the vertically polarized light S to the switching structure 12, so that the vertically polarized light S is output to the sixth polarization switching unit F6 along a second optical axis that forms the preset angle with the second principal optical axis in the switching structure 12.

[0164] The sixth polarization switching unit F6 is further configured to output the vertically polarized light S to the first output polarization beam splitter 103, so that the vertically polarized light S is reflected by the first output polarization beam splitter 103 to the eleventh polarization switching unit F11.

[0165] The eleventh polarization switching unit F11 is further configured to output the vertically polarized light S to the first output total reflection mirror 106, so that the vertically polarized light S is reflected by the first output total reflection mirror 106 to the third output polarization beam splitter 105.

[0166] The third output polarization beam splitter 105 is further configured to perform beam combination on the fourteenth light beam P13 and the vertically polarized light S to form a fifth single-channel light beam and output the fifth single-channel light beam to the fifth output port Ch6.

[0167] In a specific implementation, for optical path five, the horizontally polarized light P reaches the first polarization switching unit F1 through the input total reflection mirror 102. At this time, the first polarization switching unit F1 adds a magnetic field to rotate the polarization state of the light beam by 90°, changing the horizontally polarized light P into the thirteenth light beam S2 with a vertical polarization state. The thirteenth light beam S2 enters the switching structure 12 and exits along the first optical axis at a preset angle with respect to the first main optical axis in the switching structure 12. After the output angle is changed by the switching structure 12, it reaches the fourth polarization switching unit F4. At this time, the fourth polarization switching unit F4 adds a magnetic field to rotate the polarization state of the light beam by 90°, changing the thirteenth light beam S2 into the fourteenth light beam P13 with a horizontal polarization state. The fourteenth light beam P13 enters the second output polarization beam splitter 104 while maintaining the horizontal polarization state, is transmitted into the second output total reflection mirror 107, and reaches the seventh polarization switching unit F7 after being reflected by the second output total reflection mirror 107. The seventh polarization switching unit F7 does not add a magnetic field and the light beam is transmitted while maintaining the horizontal polarization state. The fourteenth light beam P12 is transmitted after reaching the third output polarization beam splitter 105.

[0168] Another vertically polarized light S is reflected by the input polarization beam splitter 101 and reaches the second polarization switching unit F2. The second polarization switching unit F2 does not add a magnetic field, and the light beam enters the switching structure 12 while maintaining the vertical polarization state. It exits along the second optical axis at a preset angle with respect to the second main optical axis in the switching structure 12. After the output angle is changed by the switching structure 12, it reaches the sixth polarization switching unit F6. The sixth polarization switching unit F6 does not add a magnetic field, and the vertically polarized light S enters the first output polarization beam splitter 103 while maintaining the vertical polarization state, is reflected and reaches the eleventh polarization switching unit F11. The eleventh polarization switching unit F11 does not add a magnetic field, and the vertically polarized light S is transmitted while maintaining the vertical polarization state. The vertically polarized light S is reflected by the first output total reflection mirror 106 and is reflected after reaching the third output polarization beam splitter 105. In the third output polarization beam splitter 105, the transmitted fourteenth light beam P13 and the reflected vertically polarized light S are combined and reach the fifth output port Ch6.

[0169] Refer to Figure 8 , Figure 8 which is a schematic structural diagram of optical path six in the third embodiment of the multi-port magneto-optical switch device of the present application.

[0170] As Figure 8 shown, the first polarization switching unit F1 is further configured to output the horizontally polarized light P to the switching structure 12, so that the horizontally polarized light P is output along the first main optical axis to the third polarization switching unit F3 in the switching structure 12.

[0171] The third polarization switching unit F3 is further configured to output the horizontally polarized light P to the second output polarization beam splitter prism 104, so that the horizontally polarized light P is reflected by the second output polarization beam splitter prism 104 and the second output total reflection mirror 107 to the eighth polarization switching unit F8.

[0172] The eighth polarization switching unit F8 is further configured to output the horizontally polarized light P to the third output polarization beam splitter prism 105.

[0173] The second polarization switching unit F2 is further configured to convert the vertically polarized light S into the fifteenth light beam P3 in the horizontal polarization state and output it to the switching structure 12, so that the fifteenth light beam P3 is output along the second principal optical axis in the switching structure 12 to the fifth polarization switching unit F5.

[0174] The fifth polarization switching unit F5 is further configured to convert the fifteenth light beam P2 into the sixteenth light beam S22 in the vertical polarization state and output it to the first output polarization beam splitter prism 103, so that the sixteenth light beam S22 is reflected by the first output polarization beam splitter prism 103 to the twelfth polarization switching unit F12.

[0175] The twelfth polarization switching unit F12 is further configured to output the sixteenth light beam S22 to the first output total reflection mirror 106, so that the sixteenth light beam S22 is reflected by the first output total reflection mirror 106 to the third output polarization beam splitter prism 105.

[0176] The third output polarization beam splitter prism 105 is further configured to combine the horizontally polarized light P and the sixteenth light beam S22, form a sixth single-channel light beam and output it to the sixth output port Ch7.

[0177] In a specific implementation, for optical path six, the horizontally polarized light P reaches the first polarization switching unit F1 through the input total reflection mirror 102. The first polarization switching unit F1 does not apply a magnetic field, and the light beam remains in the horizontally polarized state and enters the switching structure 12, where it travels along the first principal optical axis to reach the third polarization switching unit F3. The third polarization switching unit F3 does not apply a magnetic field, and the horizontally polarized light P remains in the horizontally polarized state and enters the second output polarization beam splitter prism 104, where it is transmitted into the second output total reflection mirror 107 and is reflected by the second output total reflection mirror 107 to reach the eighth polarization switching unit F8. The eighth polarization switching unit F8 does not apply a magnetic field, and the light beam remains in the horizontally polarized state and is transmitted after the horizontally polarized light P reaches the third output polarization beam splitter prism 105.

[0178] Another vertically polarized light beam, the S light beam, is reflected by the input polarization beam splitter prism 101 and reaches the second polarization switching unit F2. At this time, the second polarization switching unit F2 applies a magnetic field to rotate the polarization state of the light beam by 90°, changing the vertically polarized light beam S into the fifteenth light beam P3 with a horizontal polarization state. The fifteenth light beam P3 is transmitted along the second principal optical axis in the switching structure 12 and reaches the fifth polarization switching unit F5. At this time, the fifth polarization switching unit F5 applies a magnetic field to rotate the polarization state of the light beam by 90°, changing the fifteenth light beam P3 into the sixteenth light beam S22 with a vertically polarized state. The sixteenth light beam S22 reaches the first output polarization beam splitter prism 103, is reflected, and reaches the twelfth polarization switching unit F12. At this time, the twelfth polarization switching unit F12 does not apply a magnetic field, and the sixteenth light beam S22 maintains its vertically polarized state. After being reflected by the first output total reflection mirror 106, it reaches the third output polarization beam splitter prism 105 and is then reflected. In the third output polarization beam splitter prism 105, the transmitted horizontal polarized light beam P and the reflected sixteenth light beam S22 are combined and reach the sixth output port Ch7.

[0179] It should be noted that, as can be seen from the above optical paths, using 1 birefringent crystal can achieve the function of switching one light beam to six light beams and arbitrary output from 6 ports in the first-level switching structure. Similarly, referring to Figure 9 , Figure 9This is a schematic diagram of the extended optical path structure of the third embodiment of the multi-port magneto-optical switch device of the present application. On the basis of the original optical path, a second birefringent crystal 202 is provided on one side of the first birefringent crystal 201. At the same time, a first polarization unit combination D1 and a second polarization unit combination D2 are added. The light beam is divided into 8 light beams with different polarization states and different paths by two birefringent crystals. Among them, the first polarization switching unit combination D1 includes four polarization switching units, corresponding to four light beams with different polarization states and paths; the second polarization switching unit combination D2 includes four polarization switching units, corresponding to four light beams with different polarization states and paths. A third polarization switching unit combination D3 can be added between the first output polarization beam splitter prism 103 and the second output polarization beam splitter prism 104. The third polarization switching unit combination D3 includes four polarization switching units, corresponding to four light beams with different polarization states and different paths. A fourth polarization switching unit combination D4 can be added on one side of the second output total reflection mirror 107. The fourth polarization switching unit combination D4 includes four polarization switching units, corresponding to four light beams with different polarization states and different paths. A fifth polarization switching unit combination D5 can be added between the first output polarization beam splitter prism 103 and the first output total reflection mirror 106. The fifth polarization switching unit combination D5 includes four polarization switching units, corresponding to four light beams with different polarization states and different paths. By changing the external magnetic field of each polarization switching unit, the polarization state of the light beam is changed, so that a 1×12 fast-switching optical switch can be realized. The light beam input from the input collimator array Ch1 can be output from any one of the twelve output ports, namely the first output port Ch2, the second output port Ch3, the third output port Ch4, the fourth output port Ch5, the fifth output port Ch6, the sixth output port Ch7, the seventh output port Ch8, the eighth output port Ch9, the ninth output port Ch10, the tenth output port Ch11, the eleventh output port Ch12, and the twelfth output port Ch13.

[0180] It can be understood that the input optical path structure 11 and the output optical path structure 13 can be kept unchanged, and birefringent crystals and polarization switching units can be continuously added in the optical path, so that the output ports can be expanded to 1×24, 1×48, 1×96. A fast-switching magneto-optical switch of 1×3×2 n (n is the number of optical refractive crystals, n = 1, 2, 3...), that is, using one birefringent crystal to achieve 1×6, using two birefringent crystals to achieve 1×12, using three birefringent crystals can achieve 1×24, and so on, so as to achieve the expansion of more port numbers.

[0181] The above are only some embodiments of the present application, and do not limit the patent scope of the present application. All equivalent structural transformations made under the technical concept of the present application by using the content of the specification and drawings of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A multi-port magneto-optical switch device, characterized in that The multi-port magneto-optical switch device includes: an input optical path structure, a switching structure, an output optical path structure, and a polarization switching unit; The input optical path structure and the output optical path structure are arranged on both sides of the switching structure; The input optical path structure, the switching structure, and the output optical path structure form a main optical path; Wherein, a plurality of the polarization switching units are provided in the main optical path; The polarization switching unit is used to switch the polarization state of the light beam transmitted in the main optical path, so that the light beams with different polarization states output from the switching structure to the output optical path structure are transmitted along different optical paths; The output optical path structure is used to combine the light beams transmitted along different optical paths to form multiple single-path light beams and then output them to the corresponding output ports.

2. The multi-port magneto-optical switch device according to claim 1, wherein The input optical path structure includes: an input polarization beam splitter prism and an input total reflection mirror; The output optical path structure includes: a first output polarization beam splitter prism, a second output polarization beam splitter prism, a third output polarization beam splitter prism, a first output total reflection mirror, and a second output total reflection mirror; The polarization switching unit includes: a first polarization switching unit, a second polarization switching unit, a third polarization switching unit, a fourth polarization switching unit, a fifth polarization switching unit, a sixth polarization switching unit, a seventh polarization switching unit, an eighth polarization switching unit, a ninth polarization switching unit, a tenth polarization switching unit, an eleventh polarization switching unit, and a twelfth polarization switching unit; The input polarization beam splitter prism is connected to the input total reflection mirror; The first output polarization beam splitter prism is arranged between the second output polarization beam splitter prism and the first output total reflection mirror; The second output polarization beam splitter prism is connected to the second output total reflection mirror, and the first output total reflection mirror is connected to the third output polarization beam splitter prism; The first polarization switching unit is arranged between the input total reflection mirror and the switching structure, and the second polarization switching unit is arranged between the input polarization beam splitter prism and the switching structure; The third polarization switching unit and the fourth polarization switching unit are arranged between the second output polarization switching unit and the switching structure, and the fifth polarization switching unit and the sixth polarization switching unit are arranged between the first output polarization switching unit and the switching structure; The seventh polarization switching unit and the eighth polarization switching unit are arranged between the second output total reflection mirror and the third output polarization beam splitter prism, the ninth polarization switching unit and the tenth polarization switching unit are arranged between the first output polarization beam splitter prism and the second output polarization beam splitter prism, and the eleventh polarization switching unit and the twelfth polarization switching unit are arranged between the first output polarization beam splitter prism and the first output total reflection mirror.

3. The multi-port magneto-optical switch device according to claim 2, characterized in that The multi-port magneto-optical switch device further includes: an input collimator array; The input collimator array is used to convert the input light beam into a parallel light beam with an arbitrary polarization direction and output the parallel light beam to the input polarization beam splitter prism; The input polarization beam splitter prism is used to decompose the parallel light beam into a horizontally polarized light and a vertically polarized light with perpendicular polarization directions; The input polarization beam splitter prism is further configured to transmit the horizontally polarized light to the input total reflection mirror and reflect the vertically polarized light to the second polarization switching unit; The input total reflection mirror is configured to reflect the horizontally polarized light to the first polarization switching unit.

4. The multi-port magneto-optical switch device according to claim 3, wherein The first polarization switching unit is configured to output the horizontally polarized light to the switching structure, so that the horizontally polarized light is output to the third polarization switching unit along the first principal optical axis in the switching structure; The third polarization switching unit is configured to convert the horizontally polarized light into a first light beam in a vertical polarization state and then output it to the second output polarization beam splitter prism, so that the first light beam is reflected by the second output polarization beam splitter prism to the tenth polarization switching unit; The tenth polarization switching unit is configured to output the first light beam to the first output polarization beam splitter prism; The second polarization switching unit is configured to convert the vertically polarized light into a second light beam in a horizontal polarization state and then output it to the switching structure, so that the second light beam is output to the fifth polarization switching unit along the second principal optical axis in the switching structure; The fifth polarization switching unit is configured to output the second light beam to the first output polarization beam splitter prism; The first output polarization beam splitter prism is configured to combine the first light beam and the second light beam to form a first single-path light beam and then output it to the first output port.

5. The multi-port magneto-optical switch device according to claim 3, wherein, The first polarization switching unit is further configured to convert the horizontally polarized light into a third light beam in a vertical polarization state and then output it to the switching structure, so that the third light beam is output to the fourth polarization switching unit along a first optical axis at a preset angle with the first principal optical axis in the switching structure; The fourth polarization switching unit is configured to output the third light beam to the second output polarization beam splitter prism, so that the third light beam is reflected by the second output polarization beam splitter prism to the ninth polarization switching unit; The ninth polarization switching unit is configured to output the third light beam to the first output polarization beam splitter prism; The second polarization switching unit is further configured to output the vertically polarized light to the switching structure, so that the vertically polarized light is output to the sixth polarization switching unit along a second optical axis at the preset angle with the second principal optical axis in the switching structure; The sixth polarization switching unit is configured to convert the vertically polarized light into a fourth light beam in a horizontal polarization state and then output it to the first output polarization beam splitter prism; The first output polarization beam splitter prism is further configured to combine the third light beam and the fourth light beam to form a second single-path light beam and then output it to the second output port.

6. The multi-port magneto-optical switch device according to claim 3, characterized in that, The first polarization switching unit is further configured to output the horizontally polarized light to the switching structure, so that the horizontally polarized light is output to the third polarization switching unit along the first principal optical axis in the switching structure; The third polarization switching unit is further configured to output the horizontally polarized light to the second output polarization beam splitter prism, so that the horizontally polarized light is reflected by the second output polarization beam splitter prism and the second output total reflection mirror to the eighth polarization switching unit; The eighth polarization switching unit is configured to convert the horizontally polarized light into a fifth light beam in a vertical polarization state and output it to the third output polarization beam splitter prism; The second polarization switching unit is further configured to convert the vertically polarized light into a sixth light beam in a horizontal polarization state and output it to the switching structure, so that the sixth light beam is output to the fifth polarization switching unit along the second principal optical axis in the switching structure; The fifth polarization switching unit is further configured to convert the sixth light beam into a seventh light beam in a vertical polarization state and output it to the first output polarization beam splitter prism, so that the seventh light beam is reflected by the first output polarization beam splitter prism to the twelfth polarization switching unit; The twelfth polarization switching unit is configured to convert the seventh light beam into an eighth light beam in a horizontal polarization state and output it to the first output total reflection mirror, so that the eighth light beam is reflected by the first output total reflection mirror to the third output polarization beam splitter prism; The third output polarization beam splitter prism is configured to combine the fifth light beam and the eighth light beam to form a third single-path light beam and output it to the third output port.

7. The multi-port magneto-optical switch device according to claim 3, characterized in that, The first polarization switching unit is further configured to convert the horizontally polarized light into a ninth light beam in a vertical polarization state and output it to the switching structure, so that the ninth light beam is output to the fourth polarization switching unit along a first optical axis that forms a preset angle with the first principal optical axis in the switching structure; The fourth polarization switching unit is further configured to convert the ninth light beam into a tenth light beam in a horizontal polarization state and output it to the second output polarization beam splitter prism, so that the tenth light beam is reflected by the second output polarization beam splitter prism and the second output total reflection mirror to the seventh polarization switching unit; The seventh polarization switching unit is configured to convert the tenth light beam into an eleventh light beam in a vertical polarization state and output it to the third output polarization beam splitter prism; The second polarization switching unit is further configured to output the vertically polarized light to the switching structure, so that the vertically polarized light is output to the sixth polarization switching unit along a second optical axis that forms the preset angle with the second principal optical axis in the switching structure; The sixth polarization switching unit is configured to output the vertically polarized light to the first output polarization beam splitter prism, so that the vertically polarized light is reflected by the first output polarization beam splitter prism to the eleventh polarization switching unit; The eleventh polarization switching unit is configured to convert the vertically polarized light into a twelfth light beam in a horizontal polarization state and output it to the first output total reflection mirror, so that the twelfth light beam is reflected by the first output total reflection mirror to the third output polarization beam splitter prism; The third output polarization beam splitter prism is further configured to combine the eleventh light beam and the twelfth light beam to form a fourth single-path light beam and output it to the fourth output port.

8. The multi-port magneto-optical switch device according to claim 3, characterized in that, The first polarization switching unit is further configured to convert the horizontally polarized light into a thirteenth light beam in a vertical polarization state and output it to the switching structure, so that the thirteenth light beam is output to the fourth polarization switching unit along a first optical axis that forms a preset angle with the first principal optical axis in the switching structure; The fourth polarization switching unit is further configured to convert the thirteenth light beam into a fourteenth light beam with a horizontal polarization state and output the fourteenth light beam to the second output polarization beam splitter prism, so that the fourteenth light beam is reflected by the second output polarization beam splitter prism and the second output total reflection mirror to the seventh polarization switching unit; The seventh polarization switching unit is further configured to output the fourteenth light beam to the third output polarization beam splitter prism; The second polarization switching unit is further configured to output the vertically polarized light to the switching structure, so that the vertically polarized light is output to the sixth polarization switching unit along a second optical axis that forms the preset angle with the second main optical axis in the switching structure; The sixth polarization switching unit is further configured to output the vertically polarized light to the first output polarization beam splitter prism, so that the vertically polarized light is reflected by the first output polarization beam splitter prism to the eleventh polarization switching unit; The eleventh polarization switching unit is further configured to output the vertically polarized light to the first output total reflection mirror, so that the vertically polarized light is reflected by the first output total reflection mirror to the third output polarization beam splitter prism; The third output polarization beam splitter prism is further configured to combine the fourteenth light beam and the vertically polarized light to form a fifth single-path light beam and output the fifth single-path light beam to the fifth output port.

9. The multi-port magneto-optical switch device according to claim 3, characterized in that, The first polarization switching unit is further configured to output the horizontally polarized light to the switching structure, so that the horizontally polarized light is output to the third polarization switching unit along the first main optical axis in the switching structure; The third polarization switching unit is further configured to output the horizontally polarized light to the second output polarization beam splitter prism, so that the horizontally polarized light is reflected by the second output polarization beam splitter prism and the second output total reflection mirror to the eighth polarization switching unit; The eighth polarization switching unit is further configured to output the horizontally polarized light to the third output polarization beam splitter prism; The second polarization switching unit is further configured to convert the vertically polarized light into a fifteenth light beam with a horizontal polarization state and output the fifteenth light beam to the switching structure, so that the fifteenth light beam is output to the fifth polarization switching unit along the second main optical axis in the switching structure; The fifth polarization switching unit is further configured to convert the fifteenth light beam into a sixteenth light beam with a vertical polarization state and output the sixteenth light beam to the first output polarization beam splitter prism, so that the sixteenth light beam is reflected by the first output polarization beam splitter prism to the twelfth polarization switching unit; The twelfth polarization switching unit is further configured to output the sixteenth light beam to the first output total reflection mirror, so that the sixteenth light beam is reflected by the first output total reflection mirror to the third output polarization beam splitter prism; The third output polarization beam splitter prism is further configured to combine the horizontally polarized light and the sixteenth light beam to form a sixth single-path light beam and output the sixth single-path light beam to the sixth output port.

10. The multi-port magneto-optical switch device according to any one of claims 1 to 9, characterized in that, The switching structure includes: a plurality of birefringent crystals.

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