High-speed magneto-optical switch

Abstract

The present invention discloses a high-speed magneto-optical switch, which includes a single-fiber input collimator, a polarization beam splitter, a first polarization-maintaining dual-fiber collimator, a half-wave plate, a Faraday rotator, a second polarization-maintaining dual-fiber collimator, a polarization beam combiner, and a dual-fiber output collimator, which are sequentially arranged along the light propagation direction; wherein the Faraday rotator includes a mounting bracket, a magneto-optical crystal, and a plurality of magnetic field generating components arranged in parallel, the magneto-optical crystal is arranged on the mounting bracket, the plurality of magnetic field generating components are respectively arranged around the mounting bracket, and the polarities of the plurality of magnetic field generating components are arranged in phase. The technical solution of the present invention can solve the problem that the existing optical switch has a large volume in practical applications, resulting in high production costs and slow switching speed.

Description

Technical Field

[0001] The invention relates to the field of optical devices, and in particular to a high-speed magneto-optical switch. Background Art

[0002] With the rapid development of the field of optical switches, people have designed a variety of new optical switch devices based on different working principles, such as mechanical optical switches, electro-optical switches, magneto-optical switches, etc. Different types of switches have their own advantages and disadvantages in practical applications. Among them, mechanical optical switches have the advantages of low insertion loss and high isolation, but in contrast, their switching time is only in the order of ms, which cannot meet the needs of high switching speeds; although electro-optical switches have fast switching speeds, the electro-optical effect is greatly affected by temperature, and performance may be affected by changes in ambient temperature, and their production costs are often high; magneto-optical switches have the advantages of high reliability, low power consumption, and small size, but the inductance and time constant of their Faraday rotators are large, which greatly hinders the switching time of magneto-optical switches. Summary of the invention

[0003] The main purpose of the present invention is to provide a high-speed magneto-optical switch, aiming to solve the problems of existing optical switches in practical applications, such as large size, high production cost and slow switching speed.

[0004] To achieve the above object, the high-speed magneto-optical switch proposed in the present invention comprises:

[0005] A single-fiber input collimator, a polarization beam splitter, a first polarization-maintaining dual-fiber collimator, a half-wave plate, a Faraday rotator, a second polarization-maintaining dual-fiber collimator, a polarization beam combiner, and a dual-fiber output collimator are sequentially arranged along the light propagation direction; wherein,

[0006] The Faraday rotator includes a mounting bracket, a magneto-optical crystal and a plurality of magnetic field generating components arranged in parallel. The magneto-optical crystal is arranged on the mounting bracket, and the plurality of magnetic field generating components are respectively arranged in a ring around the mounting bracket. The polarities of the plurality of magnetic field generating components are arranged in phase.

[0007] Optionally, the plurality of magnetic field generating components are coaxially arranged.

[0008] Optionally, the plurality of magnetic field generating components include:

[0009] a first magnetic field generating component and a second magnetic field generating component, wherein the first magnetic field generating component and the second magnetic field generating component are respectively arranged around the mounting bracket;

[0010] The first magnetic field generating component has a first input end and a second output end, and the second magnetic field generating component has a second input end and a second output end, the second input end is connected to the first input end, and the second output end is connected to the first output end, so that the first magnetic field generating component and the second magnetic field generating component are connected in parallel.

[0011] Optionally, the first magnetic field generating component is composed of a plurality of turns of a first coil, the plurality of turns of the first coil are respectively wound around the mounting bracket, and the first coil has a first input pin and a first output pin;

[0012] The second magnetic field generating assembly is composed of a plurality of turns of a second coil, the plurality of turns of the second coil are respectively wound around the mounting bracket, and the second coil has a second input pin and a second output pin;

[0013] The second input pin is connected to the first input pin, and the second output pin is connected to the first output pin, so that the first coil and the second coil are connected in parallel.

[0014] Optionally, the first input pin, the first output pin, the second input pin, and the second output pin are sequentially wound around the mounting bracket from inside to outside to form a solenoid-type inductor structure.

[0015] Optionally, the mounting bracket includes a bracket body, a first limiting portion and a second limiting portion;

[0016] The magneto-optical crystal is arranged on the support body, and the first limiting portion and the second limiting portion are arranged on the support body at intervals and form a limiting structure with the support body.

[0017] Optionally, the bracket body includes a first mounting portion and a second mounting portion;

[0018] The magneto-optical crystal is disposed between the first mounting portion and the second mounting portion, and has a first connection end and a second connection end, wherein the first connection end is connected to the first mounting portion, and the second connection end is connected to the second mounting portion.

[0019] Optionally, the first mounting portion is provided with a first mounting hole, and the first connecting end extends into the first mounting hole;

[0020] The second mounting portion is provided with a second mounting hole, and the second connecting end extends into the second mounting hole.

[0021] Optionally, the mounting bracket is made of epoxy resin material.

[0022] Optionally, the crystal center of the magneto-optical crystal is located on the optical path of the output light beam of the half-wave plate.

[0023] The technical solution of the present invention proposes a high-speed magneto-optical switch, which includes a single-fiber input collimator, a polarization beam splitter, a first polarization-maintaining dual-fiber collimator, a half-wave plate, a Faraday rotator, a second polarization-maintaining dual-fiber collimator, a polarization beam combiner, and a dual-fiber output collimator arranged in sequence along the light propagation direction; wherein the Faraday rotator includes a mounting bracket, a magneto-optical crystal, and a plurality of magnetic field generating components arranged in parallel, the magneto-optical crystal is arranged on the mounting bracket, the plurality of magnetic field generating components are respectively arranged in a ring around the mounting bracket, and the polarities of the plurality of magnetic field generating components are arranged in phase. The technical solution of the present invention can solve the problem that the existing optical switch has a large volume in practical applications, resulting in high production costs and slow switching speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the structure of the high-speed magneto-optical switch of the present invention;

[0026] Figure 2 It is a front view of a Faraday rotator in a high-speed magneto-optical switch of the present invention;

[0027] Figure 3 A top view of a Faraday rotator in a high-speed magneto-optical switch of the present invention;

[0028] Figure 4 A structural schematic diagram of a plurality of magnetic field generating components of a Faraday rotator in a high-speed magneto-optical switch of the present invention from one perspective;

[0029] Figure 5 A schematic structural diagram of multiple magnetic field generating components of a Faraday rotator in a high-speed magneto-optical switch of the present invention from another perspective;

[0030] Figure 6 A structural schematic diagram of multiple magnetic field generating components of a Faraday rotator in a high-speed magneto-optical switch of the present invention from another perspective;

[0031] Figure 7 for Figure 6 A partial enlarged view of the middle A;

[0032] Figure 8 This is a simulation experiment diagram of the high-speed magneto-optical switch of the present invention.

[0033] Description of Figure Numbers:

[0034]

[0035]

[0036] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] It is understandable that optical switch devices, as optical elements for switching optical paths, are important components for building cross-connection equipment. With the rapid development of integrated switching optical networks, people's requirements for protection switching and restoration services of the entire network have been further improved. Compared with traditional mechanical switches, optical switches play a more important role in protection switching and restoration issues due to their advantages such as large capacity, low loss, and high switching speed.

[0042] With the rapid development of the field of optical switches, people have designed a variety of new optical switch devices according to different working principles, such as mechanical optical switches, electro-optical switches, magneto-optical switches, etc. Different types of switches have their own advantages and disadvantages in practical applications. Among them, the mechanical optical switch has the advantages of low insertion loss and high isolation, but its switching time is only in the order of ms, which cannot meet the occasions of high switching speed; although the electro-optical switch has a fast switching speed, the electro-optical effect is greatly affected by temperature, and may cause performance disorders due to changes in ambient temperature, and its production cost is often high; the magneto-optical switch has the advantages of high reliability, low power consumption, and small size, but the inductance and time constant of its Faraday rotator 500 are both large, which greatly hinders the switching time of the magneto-optical switch.

[0043] To this end, the present invention also proposes a high-speed magneto-optical switch, which aims to solve the problem that the existing optical switches have a large size in practical applications, resulting in high production costs and slow switching speed.

[0044] Reference Figures 1 to 8 In one embodiment of the present invention, the high-speed magneto-optical switch comprises:

[0045] A single-fiber input collimator 100, a polarization beam splitter 200, a first polarization-maintaining dual-fiber collimator 300, a half-wave plate 400, a Faraday rotator 500, a second polarization-maintaining dual-fiber collimator 600, a polarization beam combiner 700, and a dual-fiber output collimator 800 are sequentially arranged along the light propagation direction; wherein,

[0046] The Faraday rotator 500 includes a mounting bracket 510, a magneto-optical crystal 520, and a plurality of magnetic field generating components arranged in parallel. The magneto-optical crystal 520 is arranged on the mounting bracket 510, and the plurality of magnetic field generating components are respectively arranged in a ring around the mounting bracket 510, and the polarities of the plurality of magnetic field generating components are arranged in phase.

[0047] It can be understood that the light propagation direction refers to the propagation direction of the external input light beam in the high-speed magneto-optical switch after the light beam is incident on the high-speed magneto-optical switch of the present application. A single-fiber input collimator 100, a polarization beam splitter 200, a first polarization-maintaining dual-fiber collimator 300, a half-wave plate 400, a Faraday rotator 500, a second polarization-maintaining dual-fiber collimator 600, a polarization beam combiner 700, and a dual-fiber output collimator 800 are sequentially arranged along the light propagation direction. Specifically, the single-fiber input collimator 100 is provided with an input optical fiber, and the single-fiber input collimator 100 is used to collimate the external input light beam into a collimated light beam, and output it to the polarization beam splitter 200 through the input optical fiber; the polarization beam splitter 200 is used to decompose the collimated light beam into two orthogonal polarization states of the first light beam and the second light beam, and then output it to the first polarization-maintaining dual-fiber collimator 300; the first polarization-maintaining dual-fiber collimator 300 is used to maintain the polarization state of the first light beam and the second light beam, and convert the first light beam and the second light beam into parallel light respectively, and then output it to the half-wave plate 400; the half-wave plate 400 is used to deflect the first light beam and the second light beam counterclockwise by 45° respectively, and then output it to the Faraday rotator 500; the Faraday rotator 500 is used to generate A magnetic field is generated, and the first light beam and the second light beam are deflected according to the generated magnetic field and then output to the second polarization-maintaining dual-fiber collimator 600; the second polarization-maintaining dual-fiber collimator 600 is used to convert the deflected first light beam and the second light beam into parallel light and then output to the polarization beam combiner 700; the polarization beam combiner 700 is used to synthesize the first light beam and the second light beam converted into parallel light into a third light beam and then output to the dual-fiber output collimator 800; the dual-fiber output collimator 800 has a first output optical fiber and a second output optical fiber, and the dual-fiber output collimator 800 is used to make the third light beam emerge from one of the first output optical fiber and the second output optical fiber according to the deflection state of the first light beam and the second light beam converted into parallel light, so as to realize the switching function of the magneto-optical switch.

[0048] On the basis of the above contents, in order to improve the switching speed of the magneto-optical switch, the magneto-optical switch of the present application has made improvements to its Faraday rotator 500. The Faraday rotator 500 includes a mounting bracket 510, a magneto-optical crystal 520, and a plurality of magnetic field generating components. The mounting bracket 510 is used to mount the magneto-optical crystal 520 and a plurality of magnetic field generating components, and has a supporting function for the above components. The shape of the mounting bracket 510 is generally not limited, and can be specifically set according to the installation requirements of the magneto-optical crystal 520 or the magnetic field generating components. Moreover, the material of the mounting bracket 510 can be metal or plastic. The material of the mounting bracket 510 of this embodiment is plastic to reduce the production cost of the magneto-optical switch.

[0049] The magneto-optical crystal 520 is also called "Faraday crystal". It usually has the characteristics of large Faraday effect, low wavelength absorption coefficient, high magnetic permeability, high magnetization intensity, etc., which can complete the deflection of the light beam and realize the state of the switch. The magneto-optical crystal 520 can be implemented by ferromagnetic magneto-optical crystal 520, paramagnetic magneto-optical crystal 520, diamagnetic magneto-optical crystal 520, such as rare earth iron garnet (RIG), yttrium iron garnet (YIG), yttrium aluminum garnet (YAG), terbium gallium garnet (TGG), terbium aluminum garnet (TAG), etc. The magneto-optical crystal 520 used in this embodiment is rare earth iron garnet (RIG). The saturation magnetic field intensity of rare earth iron garnet (RIG) is 200Oe, and the magnetic field intensity is small, so that a small amplitude voltage is applied to make the Faraday rotator 500 rotate, thereby realizing the function of high-speed switching. That is to say, the magnetic field intensity generated by the multiple magnetic field generating components must always be greater than the saturation magnetic field intensity of the magneto-optical crystal 520, so that the magneto-optical crystal 520 can complete the deflection of the light beam and realize the switching state of the magneto-optical switch. In this regard, the polarities of the multiple magnetic field generating components of this embodiment are set in phase. In this case, when the multiple magnetic field generating components are all connected with current, the magnetic flux directions generated by the multiple magnetic field generating components are the same, which can increase the generated magnetic field intensity. Moreover, after multiple simulation experiments, it can be known that the average magnetic field intensity generated by the multiple magnetic field generating components of the present application is 250Oe, which is greater than the saturation magnetic field intensity of 200Oe of the magneto-optical crystal 520, which can make the magneto-optical crystal 520 fully magnetized, complete the deflection of the light beam, and realize the switching state of the magneto-optical switch.

[0050] In addition, the magnetic field generating component can be composed of multiple coils, but since the energized solenoid or energized solenoid composed of multiple coils itself has a large inductance, the time for the external power supply to generate a magnetic field through the energized solenoid or energized solenoid is hindered, thereby increasing the time constant of the Faraday rotator 500, thereby greatly increasing the switching time of the magneto-optical switch.

[0051] According to the time constant formula:

[0052]

[0053] Among them, τ is the time constant, L is the inductance, and R is the resistance value. From the above time constant formula, it can be seen that when the number of coils is constant, by reducing the inductance of the energized solenoid or energized solenoid, the time constant can be effectively reduced and the switching time of the magneto-optical switch can be reduced.

[0054] In this regard, the present application sets multiple magnetic field generating components in parallel. Considering that multiple magnetic field generating components will be affected by mutual inductance after being connected in parallel, when multiple magnetic field generating components are connected in parallel, the inductances of the multiple magnetic field generating components are L1, L2, ..., L n; Where n is the number of magnetic field generating components. Mutual inductance coupling coefficient M = 0.99.

[0055] According to the definition formula of inductance:

[0056]

[0057] Where L is the inductance, is the magnetic flux, and I is the current value. From the above inductance formula, we can see that when two or even more equivalent inductors with the same inductance are connected in parallel, the inductance after parallel connection is significantly less than half of the original single inductance, or even smaller. Figure 8 The simulation experiment diagram shows that the magneto-optical switch of the present application can reduce the inductance of the energized solenoid or the energized solenoid in the Faraday rotator 500 to reduce the time constant of the Faraday rotator 500, so that the switching rise time of the Faraday rotator 500 is shortened to the nanometer level, thereby realizing high-speed switching of the magneto-optical switch. Moreover, the magneto-optical switch of the present application has fewer related components, which can not only make the magneto-optical switch smaller in size, but also reduce the production cost of the magneto-optical switch.

[0058] The high-speed magneto-optical switch proposed by the technical solution of the present invention comprises a single-fiber input collimator 100, a polarization beam splitter 200, a first polarization-maintaining dual-fiber collimator 300, a half-wave plate 400, a Faraday rotator 500, a second polarization-maintaining dual-fiber collimator 600, a polarization beam combiner 700 and a dual-fiber output collimator 800 arranged in sequence along the light propagation direction; wherein the Faraday rotator 500 comprises a mounting bracket 510, a magneto-optical crystal 520 and a plurality of magnetic field generating components arranged in parallel, the magneto-optical crystal 520 is arranged on the mounting bracket 510, the plurality of magnetic field generating components are respectively arranged around the mounting bracket 510, and the polarities of the plurality of magnetic field generating components are arranged in phase. The technical solution of the present invention can solve the problem that the existing optical switch has a large volume in practical applications, resulting in high production costs and slow switching speed.

[0059] Reference Figures 1 to 8 In one embodiment of the present invention, the plurality of magnetic field generating components are coaxially arranged. That is, the axial directions of the plurality of magnetic field generating components are consistent with each other and parallel to the magnetic field direction. Compared with the case where the plurality of magnetic field generating components are not coaxially arranged, the magnetic field strength generated by the plurality of magnetic field generating components is further enhanced to enhance the magnetization degree of the magneto-optical crystal 520, thereby improving the switching stability of the magneto-optical switch.

[0060] Reference Figures 1 to 8 In one embodiment of the present invention, the plurality of magnetic field generating components include:

[0061] A first magnetic field generating assembly 530 and a second magnetic field generating assembly 540, wherein the first magnetic field generating assembly 530 and the second magnetic field generating assembly 540 are respectively disposed around the mounting bracket 510;

[0062] The first magnetic field generating component 530 has a first input end and a second output end, and the second magnetic field generating component 540 has a second input end and a second output end, the second input end is connected to the first input end, and the second output end is connected to the first output end, so that the first magnetic field generating component 530 and the second magnetic field generating component 540 are connected in parallel.

[0063] It is understandable that in order to reduce the number of installation components of the magneto-optical switch and improve the convenience of installation of the magneto-optical switch, the number of magnetic field generating components in this embodiment is two, and the two magnetic field generating components are respectively the first magnetic field generating component 530 and the second magnetic field generating component 540. The first magnetic field generating component 530 and the second magnetic field generating component 540 are respectively arranged around the mounting bracket 510, for example, the first magnetic field generating component 530 is arranged around the first end of the mounting bracket 510, and the second magnetic field generating component 540 is arranged around the second end of the mounting bracket 510, or the first magnetic field generating component 530 and the second magnetic field generating component 540 are arranged around the first end of the mounting bracket 510 from the inside to the outside, which is not limited in this embodiment.

[0064] Reference Figures 1 to 8 In one embodiment of the present invention, the first magnetic field generating component 530 is composed of a plurality of turns of a first coil 531, the plurality of turns of the first coil 531 are respectively wound around the mounting bracket 510, and the first coil 531 has a first input pin 5311 and a first output pin 5312;

[0065] The second magnetic field generating component 540 is composed of a plurality of turns of a second coil 541 , and the plurality of turns of the second coil 541 are respectively wound around the mounting bracket 510 , and the second coil 541 has a second input pin 5411 and a second output pin 5412 ;

[0066] The second input pin 5411 is connected to the first input pin 5311 , and the second output pin 5412 is connected to the first output pin 5312 , so that the first coil 531 and the second coil 541 are connected in parallel.

[0067] It can be understood that, based on the above embodiment, the first magnetic field generating assembly 530 is composed of a plurality of turns of the first coil 531, and the second magnetic field generating assembly 540 is composed of a plurality of turns of the second coil 541. It can be seen that the first magnetic field generating assembly 530 and the second magnetic field generating assembly 540 are both installed on the mounting bracket 510 by winding the coils, which can greatly improve the installation stability of the first magnetic field generating assembly 530 and the second magnetic field generating assembly 540.

[0068] In order to connect the first magnetic field generating component 530 and the second magnetic field generating component 540 in parallel, the number of turns of the first coil 531 is often the same as the number of turns of the second coil 541. Specifically, the first magnetic field generating component 530 of this embodiment is composed of 40 turns of the first coil 531, that is, it includes 40 turns of the first input pin 5311 and 40 turns of the first output pin 5312; the second magnetic field generating component 540 is composed of 40 turns of the second coil 541, that is, it includes 40 turns of the second input pin 5411 and 40 turns of the second output pin 5412. The 40 turns of the first input pin 5311 are connected to the 40 turns of the second input pin 5411 in a one-to-one correspondence, and the 40 turns of the first output pin 5312 are connected to the 40 turns of the second output pin 5412 in a one-to-one correspondence, so as to realize the parallel connection of the first magnetic field generating component 530 and the second magnetic field generating component 540.

[0069] When the first magnetic field generating assembly 530 and the second magnetic field generating assembly 540 are connected in parallel, it is known through experiments that the parameters of the first magnetic field generating assembly 530 of this embodiment are N1=40, l1=1.46mm, A1=4.37435mm 2 , the parameters of the second magnetic field generating assembly 540 are N2=40, l2=1.46mm, A2=3.87076mm 2 Wherein, N1 is the number of turns of the first coil 531 , l1 is the length of the first coil 531 , and A1 is the cross-sectional area of ​​the first coil 531 ; N2 is the number of turns of the second coil 541 , l2 is the length of the second coil 541 , and A2 is the cross-sectional area of ​​the second coil 541 .

[0070] According to the calculation formula of inductance:

[0071]

[0072] Wherein, L is the inductance, μ is the magnetic permeability of air, N is the number of turns of the first coil 531 or the second coil 541, A is the cross-sectional area of ​​the coil, and l is the length of the first coil 531 or the second coil 541. In this embodiment, the relevant parameters of the first magnetic field generating component 530 and the second magnetic field generating component 540 are substituted into the above-mentioned calculation formula of the inductance, and it can be known that the inductance after parallel connection is reduced from the original 3.61112μH to 0.41257μH, and the inductance is significantly reduced. It can be seen that the magneto-optical switch of the present application can reduce the inductance of the first magnetic field generating component 530 and the second magnetic field generating component 540 in the Faraday rotator 500 to reduce the time constant of the Faraday rotator 500, so that the switching rise time of the Faraday rotator 500 is shortened to the nanometer level, thereby realizing high-speed switching of the magneto-optical switch.

[0073] In another embodiment, continue to refer to Figures 4 to 7 The first input pin 5311 of the multi-turn first coil 531, the second input pin 5411 of the multi-turn first coil 531, the second input pin 5411 of the multi-turn second coil 541, and the second output pin 5412 of the multi-turn second coil 541 are sequentially wound around the mounting bracket 510 from the inside to the outside to form a solenoid-type inductor structure. The integrated solenoid-type inductor structure not only makes the magnetic field intensity generated by the multiple magnetic field generating components more concentrated, better magnetizes the magneto-optical crystal 520, but also facilitates its installation on the mounting bracket 510.

[0074] Reference Figures 1 to 8 In one embodiment of the present invention, the mounting bracket 510 includes a bracket body 511, a first limiting portion 512 and a second limiting portion 513;

[0075] The magneto-optical crystal 520 is disposed on the support body 511 , and the first limiting portion 512 and the second limiting portion 513 are spaced apart from each other on the support body 511 and form a limiting structure with the support body 511 .

[0076] It can be understood that from the above-mentioned embodiments, when multiple magnetic field generating components are arranged around the mounting bracket 510, if no limiting structure is set at both ends of the mounting bracket 510, the multiple magnetic field generating components will easily fall off from both ends of the mounting bracket 510, that is, the installation positions of the multiple magnetic field generating components are changed, and the directions of the magnetic fields generated by them are also changed, thereby affecting the magnetization of the magneto-optical crystal 520.

[0077] In this regard, the mounting bracket 510 of the present embodiment includes not only a bracket body 511, but also a first limiting portion 512 and a second limiting portion 513. When the magneto-optical crystal 520 is disposed on the bracket body 511, the first limiting portion 512 and the second limiting portion 513 are disposed on the bracket body 511 at intervals and form a limiting structure in a semi-open shape with the bracket body 511. When a plurality of magnetic field generating components are disposed around the limiting structure, the limiting structure has a limiting effect on the plurality of magnetic field generating components, so that the plurality of magnetic field generating components are not easy to fall off from the mounting bracket 510, thereby improving the stability of the installation of the plurality of magnetic field generating components.

[0078] In another embodiment, in order to improve the magnetization strength of the magneto-optical crystal 520, the support body 511 of this embodiment includes a first mounting portion 5111 and a second mounting portion 5112, the magneto-optical crystal 520 is arranged between the first mounting portion 5111 and the second mounting portion 5112, and the magneto-optical crystal 520 has a first connection end and a second connection end, the first connection end is connected to the first mounting portion 5111, and the second connection end is connected to the second mounting portion 5112. Moreover, a plurality of magnetic field generating components are respectively arranged around the first mounting portion 5111 and the second mounting portion 5112. It can be seen that through this structural setting, the plurality of magnetic field generating components form a closed annular area relative to the magneto-optical crystal 520, and the magnetic field generated by the plurality of magnetic field generating components surrounds the magneto-optical crystal 520 and passes through the center position of the annular area, and the magnetic field strength is relatively large, which can meet the need for complete magnetization of the magneto-optical crystal 520.

[0079] In another embodiment, in order to improve the installation convenience of the magneto-optical crystal 520 while satisfying the magnetization requirements of the magneto-optical crystal 520, the first installation portion 5111 of the installation bracket 510 of this embodiment is provided with a first installation hole, and the second installation portion 5112 of the installation bracket 510 is provided with a second installation hole. The installation can be completed by inserting the first connection end of the magneto-optical crystal 520 into the first installation hole, and the second connection end of the magneto-optical crystal 520 into the second installation hole, which not only has high installation accuracy, but also is convenient to operate.

[0080] Reference Figures 1 to 8 In one embodiment of the present invention, the mounting bracket 510 is made of epoxy resin material. Epoxy resin material has excellent physical and electrical insulation properties, high strength, low shrinkage, corrosion resistance and high insulation. The mounting bracket 510 made of epoxy resin material has good corrosion resistance, strong anti-aging performance and long service life.

[0081] Reference Figures 1 to 8 In one embodiment of the present invention, the crystal center 521 of the magneto-optical crystal 520 is located on the optical path of the light beam emitted by the half-wave plate 400, so that the light beam emitted by the half-wave plate 400 can be accurately incident on the crystal center 521 of the magneto-optical crystal 520, meeting the need for complete magnetization of the magneto-optical crystal 520.

[0082] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A high-speed magneto-optical switch, characterized in that: include: A single-fiber input collimator, a polarization beam splitter, a first polarization-maintaining dual-fiber collimator, a half-wave plate, a Faraday rotator, a second polarization-maintaining dual-fiber collimator, a polarization beam combiner, and a dual-fiber output collimator are sequentially arranged along the light propagation direction; wherein, The Faraday rotator comprises a mounting bracket, a magneto-optical crystal and a plurality of magnetic field generating components arranged in parallel, wherein the magneto-optical crystal is arranged on the mounting bracket, the plurality of magnetic field generating components are respectively arranged in a ring around the mounting bracket, the polarities of the plurality of magnetic field generating components are arranged in phase, and the plurality of magnetic field generating components are arranged coaxially; The mounting bracket comprises a bracket body, a first limiting portion and a second limiting portion; The magneto-optical crystal is arranged on the support body, and the first limiting portion and the second limiting portion are arranged on the support body at intervals and form a limiting structure with the support body; The bracket body includes a first mounting portion and a second mounting portion; The magneto-optical crystal is disposed between the first mounting portion and the second mounting portion, and has a first connection end and a second connection end, wherein the first connection end is connected to the first mounting portion, and the second connection end is connected to the second mounting portion.

2. The high-speed magneto-optical switch according to claim 1, characterized in that: The plurality of magnetic field generating components include: a first magnetic field generating component and a second magnetic field generating component, wherein the first magnetic field generating component and the second magnetic field generating component are respectively arranged around the mounting bracket; The first magnetic field generating component has a first input end and a first output end, and the second magnetic field generating component has a second input end and a second output end, the second input end is connected to the first input end, and the second output end is connected to the first output end, so that the first magnetic field generating component and the second magnetic field generating component are connected in parallel.

3. The high-speed magneto-optical switch according to claim 2, characterized in that: The first magnetic field generating component is composed of a plurality of turns of a first coil, the plurality of turns of the first coil are respectively wound around the mounting bracket, and the first coil has a first input pin and a first output pin; The second magnetic field generating assembly is composed of a plurality of turns of a second coil, the plurality of turns of the second coil are respectively wound around the mounting bracket, and the second coil has a second input pin and a second output pin; The second input pin is connected to the first input pin, and the second output pin is connected to the first output pin, so that the first coil and the second coil are connected in parallel.

4. The high-speed magneto-optical switch according to claim 3, characterized in that: The first input pin, the first output pin, the second input pin, and the second output pin are sequentially wound around the mounting bracket from inside to outside to form a solenoid-type inductor structure.

5. The high-speed magneto-optical switch according to claim 1, characterized in that: The first mounting portion is provided with a first mounting hole, and the first connecting end extends into the first mounting hole; The second mounting portion is provided with a second mounting hole, and the second connecting end extends into the second mounting hole.

6. The high-speed magneto-optical switch according to claim 1, characterized in that: The mounting bracket is made of epoxy resin material.

7. The high-speed magneto-optical switch according to claim 1, characterized in that: The crystal center of the magneto-optical crystal is located on the optical path of the output light beam of the half-wave plate.

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