CN111338104A - 2x2 magneto-optical switch and assembling and debugging method thereof - Google Patents

Abstract

The invention relates to a 2x2 magneto-optical switch, which comprises a first collimator, an optical core component, a coil and a second collimator, wherein the first collimator, the optical core component, the coil and the second collimator are sequentially arranged from left to right; the first collimator comprises first and second optical fibers; the second collimator comprises third and fourth optical fibers; the coil generates magnetic fields in different directions according to the electrifying direction to realize that the light beam of the first optical fiber is coupled into the third optical fiber, the light beam of the second optical fiber is coupled into the fourth optical fiber or the light beam from the first optical fiber is coupled into the fourth optical fiber, and the light beam of the second optical fiber is coupled into the third optical fiber; the first collimator collimates the light from the first and the two optical fibers into parallel light beams, or guides the parallel light beams into the first and the two optical fibers; the second collimator collimates the light from the third and the fourth optical fibers into parallel beams, or guides the parallel beams into the third and the fourth optical fibers. The invention has simple structure, ultra-small volume, low insertion loss, low polarization-dependent loss and ultrahigh channel switching repeatability.

Description

2x2 magneto-optical switch and assembling and debugging method thereof

Technical Field

The invention relates to the technical field of optics and optical fiber communication, in particular to a 2x2 magneto-optical switch and an assembling and debugging method thereof.

Background

An optical switch is an optical device used in an optical system to switch between an input optical fiber and one or more output optical fibers. Optical switches are used in fiber optic communication systems to connect and disconnect transmission channels, to route information modulated optical beams, to provide network protection, to provide cross-connect, and to add and drop applications. Optical switches can also be used to pulse a light source, such as a laser, or to perform other functions with a modulated or unmodulated light beam.

One type of optical switch is a 1x2 optical switch that can provide optical switching between one input port and two output ports, or between two input ports and one output port. A 1x2 optical switch using refractive optics is very reliable, has small insertion loss, and is easy to manufacture. 1x2 optical switches have been widely used in the telecommunications industry, such as protection switching, label switching, etc. 1x2 optical switches have also been used to create large size switches, such as 1x4 and 1x8 optical switches. In some cases, applying several 1x2 optical switches reduces energy consumption and or occupied physical space.

There are many technologies for implementing these optical switches, such as mechanical, electro-optical, thermo-optical, acousto-optical, magneto-optical and semiconductor technologies. Each handover technique has advantages and disadvantages. For example, mechanical switches are the most widely used routing elements and provide very low insertion loss and crosstalk characteristics, but the switching time of mechanical switches is limited to the millisecond range and the devices themselves are bulky. Furthermore, if the switch is operated by an engine driven component, the switch has a limited lifetime and is plagued by reliability problems.

In the existing scheme, a displacement sheet of a birefringent crystal is adopted to split and combine light, and a thermal beam expanding optical fiber is adopted to solve the problem of light spot compression, so that the contradiction between longer cross distance and larger light spot is solved, and the thermal beam expanding optical fiber has higher cost than the conventional optical fiber.

Disclosure of Invention

In view of the above, the present invention is directed to a 2x2 magneto-optical switch and a method for assembling and debugging the same.

In order to achieve the purpose, the invention adopts the following technical scheme:

a2 x2 magneto-optical switch comprises a first collimator, an optical core assembly, a coil and a second collimator which are sequentially arranged from left to right; the first collimator comprises first and second optical fibers; the second collimator comprises third and fourth optical fibers; the coil generates magnetic fields in different directions according to the electrifying direction to realize that the light beam of the first optical fiber is coupled into the third optical fiber, the light beam of the second optical fiber is coupled into the fourth optical fiber or the light beam from the first optical fiber is coupled into the fourth optical fiber, and the light beam of the second optical fiber is coupled into the third optical fiber; the coil generates a forward magnetic field and a reverse magnetic field according to the current direction, and controls the optical rotation direction of the first magneto-optical crystal to be forward and reverse; the first collimator collimates the light from the first and the two optical fibers into parallel light beams, or guides the parallel light beams into the first and the two optical fibers; the second collimator collimates the light from the third and the fourth optical fibers into parallel beams, or guides the parallel beams into the third and the fourth optical fibers.

Furthermore, the optical core component comprises a first polarization beam splitter prism, a first magneto-optical crystal, a first wave plate and a second polarization beam splitter prism which are sequentially arranged from left to right; the first polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface, and the first total reflection surface, the second total reflection surface and the polarization beam splitting surface are not parallel; the second polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface; the first total reflection surface, the second total reflection surface and the polarization beam splitting surface are not parallel.

Furthermore, the optical core assembly comprises a first wedge angle sheet, a third polarization beam splitter prism, a first magneto-optical crystal, a first wave plate, a fourth polarization beam splitter prism and a second wedge angle sheet which are sequentially arranged from left to right; the third polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface which are parallel; the fourth polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface which are parallel; the optical core component changes the transmission direction of the light beam through the first wedge angle sheet and the second wedge angle sheet, and changes the parallel light beam into the light beam with a set included angle.

Furthermore, the optical core component comprises a first ridge prism, a third polarization beam splitter prism, a first magneto-optical crystal, a first wave plate, a fourth polarization beam splitter prism and a second ridge prism which are sequentially arranged from left to right; the third polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface which are parallel; the fourth polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface which are parallel; the optical kernel component changes the transmission direction of the light beam through the first roof prism and the second roof prism, and changes the parallel light beam into the light beam with a set included angle.

Furthermore, the optical core assembly comprises a first refraction angle prism, a third polarization splitting prism, a first magneto-optical crystal, a first wave plate, a fourth polarization splitting prism and a second refraction angle prism which are sequentially arranged from left to right; the third polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface which are arranged in parallel, and the fourth polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface which are arranged in parallel; the optical core assembly changes the transmission direction of the light beams through the first folding prism and the second folding prism and changes the parallel light beams into the light beams with set included angles.

An assembly debugging method of a 2x2 magneto-optical switch comprises the following steps:

step S1, assembling the optical core assembly by micro-optics bonding;

step S2, pasting the optical kernel component in the outer sleeve;

step S3, covering the coil on the outer side of the outer sleeve outside the optical core component;

step S4: after the coil is electrified, the two optical fibers of the first collimator are input with optical signals, the optical signals of the two optical fibers of the second collimator are monitored, the two collimators are adjusted simultaneously, and when indexes meet preset requirements, the first collimator and the second collimator are fixed in the outer sleeve by glue.

Compared with the prior art, the invention has the following beneficial effects:

the invention has the advantages of simple structure, ultra-small volume, low insertion loss, low polarization-dependent loss, ultrahigh channel switching repeatability, ultrahigh service life and the like.

Drawings

FIG. 1 is a diagram illustrating a magneto-optical crystal and a wave plate changing the polarization state of a light beam when a forward current is applied to a coil according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the optical path of light from optical fiber 111 to optical fiber 121 of the magneto-optical switch in an embodiment of the present invention;

FIG. 3 is a schematic diagram of the optical path of light from the optical fiber 112 to the optical fiber 122 of the magneto-optical switch in an embodiment of the present invention;

FIG. 4 is a diagram illustrating the magneto-optical crystal and the wave plate changing the polarization state of the light beam when the coil is applied with a reverse current, according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of the optical path of light from optical fiber 111 to optical fiber 122 of the magneto-optical switch in an embodiment of the present invention;

FIG. 6 is a schematic diagram of the optical path of light from the optical fiber 112 to the optical fiber 121 of the magneto-optical switch in an embodiment of the present invention;

FIG. 7 is a schematic diagram of the optical path of a magneto-optical switch according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of the optical path of a second magneto-optical switch according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of optical path principles of three magneto-optical switches according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of an optical path of an embodiment of a four-magneto-optical switch according to an embodiment of the present invention;

in the figure: the optical fiber comprises a first collimator-11, a first optical fiber-111, a second optical fiber-112, a second collimator-12, a third optical fiber-121, a fourth optical fiber-122, a first polarization beam splitter prism-21, a second polarization beam splitter prism-22, a third polarization beam splitter prism-23, a fourth polarization beam splitter prism-24, a first magneto-optical crystal-31, a first wave plate-41, a coil-5, a first wedge plate-61, a second wedge plate-62, a first roof prism-71, a second roof prism-72, a first angle folding prism-81 and a second angle folding prism-82.

Detailed Description

The invention is further explained below with reference to the drawings and the embodiments.

Referring to fig. 1, the present invention provides a 2x2 magneto-optical switch, which includes a first collimator 11, an optical core assembly, a coil 5, and a second collimator 12 sequentially arranged from left to right. The coil 5 generates magnetic fields in different directions according to the electrifying direction, so that the light beam from the first optical fiber 111 is coupled into the third optical fiber 121, and the light beam from the second optical fiber 112 is coupled into the fourth optical fiber 122; and coupling the light beam from the first optical fiber 111 into the fourth optical fiber 122 and the light beam from the second optical fiber 112 into the third optical fiber 121, and vice versa. The first and second optical fibers are combined into a first collimator, and the third and fourth optical fibers are combined into a second collimator.

Example 1:

referring to fig. 1-7, the 2x2 magneto-optical switch in this embodiment comprises a first collimator 11, an optical core assembly, a coil 5, and a second collimator 12. The optical core component comprises a first polarization beam splitter prism 21, a first magneto-optical crystal 31, a first wave plate 41 and a second polarization beam splitter prism 22 which are sequentially arranged from left to right. The first polarization beam splitter prism 21 includes a first total reflection surface 211, a polarization beam splitting surface 212, and a second total reflection surface 213, wherein the first total reflection surface 211, the second total reflection surface 213, and the polarization beam splitting surface 212 are not parallel; the second polarization beam splitter prism 22 includes a first total reflection surface 221, a polarization beam splitting surface 222 and a second total reflection surface 223, and the first total reflection surface 221, the second total reflection surface 223 and the polarization beam splitting surface 222 are not parallel. The light beams input and output by the two planes of the total reflection surface and the polarization beam splitting surface are two light beams with a certain included angle, and the included angle corresponding to the two optical fibers of the dual-optical-fiber collimator is matched through the inclination angle design of the total reflection surface.

Referring to fig. 1, when a forward current is applied to coil 5 (defining one of the directions as forward direction and the other as reverse direction), a forward magnetic field is generated, and the first magneto-optical crystal 31 in the magnetic field of coil 5 is rotated clockwise by 45 ° (+ 45 °) in the direction shown in the figure. As shown in fig. 1 and 2, the analysis is carried out by the first optical fiber 111 — > the third optical fiber 121. The light beam incident from the first optical fiber 111 is split into two polarized lights perpendicular to each other by the polarization splitting surface 212 of the first polarization splitting prism 21, the polarization direction of the transmitted light is the horizontal direction (P direction), and the polarization direction of the reflected light is the vertical direction (S direction). The polarization direction of the transmitted light is along the horizontal x-axis, denoted as 111p, and the polarization direction of the reflected light is along the y-axis, denoted as 111 s. The reflected light beam 111s reaches the first magneto-optical crystal 31 after being reflected by the total reflection surface 211 of the first polarization splitting prism 21. As shown in fig. 1, the two beams of transmitted light 111p and reflected light 111s pass through the first magneto-optical crystal 31 and rotate by +45 ° to become polarized light 111p 'and 111 s', pass through the first wave plate 41 and rotate by +45 °, the original x-axis 111p light becomes y-axis polarized light 121s, the original y-axis 111s light becomes x-axis polarized light 121p, the 121s light beam reaches the polarization splitting surface 222 after being reflected by the total reflection surface 223 of the second polarization splitting prism 22, and finally is combined by the polarization splitting surface 222 of the second polarization splitting prism 22 to be output by the third optical fiber 121. It can be seen from fig. 1 that the +45 ° rotation of the first magneto-optical crystal 31 and the +45 ° rotation of the first wave plate 41 are superimposed by the propagation direction from the first optical fiber 111 > the third optical fiber 121, resulting in a 90 ° rotation of the polarized light.

From fig. 1 and 3, the second optical fiber 112 > the fourth optical fiber 122 is analyzed for directional propagation. The light beam incident from the second optical fiber 112 is reflected by the total reflection surface 213 of the first polarization splitting prism 21, reaches the polarization splitting surface 212, and is split into two mutually perpendicular polarized lights by the polarization splitting surface 212 of the first polarization splitting prism 21, where the polarization direction of the transmitted light is the horizontal direction (P direction) and the polarization direction of the reflected light is the vertical direction (S direction). The polarization direction of the transmitted light is along the horizontal x-axis, denoted 112p, and the polarization direction of the reflected light is along the y-axis, denoted 112 s. The transmitted beam 112p reaches the first magneto-optical crystal 31 after being reflected by the total reflection surface 211 of the first polarization splitting prism 21. As shown in fig. 1, the two beams of light, the transmitted beam 112p and the reflected beam 112s, are rotated by +45 ° through the first magneto-optical crystal 31 to become polarized light 112p 'and 112 s', are rotated by +45 ° through the first wave plate 41, the original x-axis 112p light becomes y-axis polarized light 122s, the original y-axis 112s light becomes x-axis polarized light 122p, the 122p light beam reaches the polarization splitting surface after being reflected by the total reflection surface 223 of the second polarization splitting prism 22, and is finally combined by the polarization splitting surface 222 of the second polarization splitting prism 22 and is reflected by the total reflection surface 221 of the second polarization splitting prism 22 to the fourth optical fiber 122 for output. It can be seen from fig. 1 that the +45 ° rotation of the first magneto-optical crystal 31 and the +45 ° rotation of the first wave plate 41 are superimposed by the propagation direction of the second optical fiber 112 — > the fourth optical fiber 122, resulting in a 90 ° rotation of the polarized light.

Referring to fig. 4, when a reverse current is applied to coil 5 (defining one of the directions as forward and the other as reverse), a forward and reverse magnetic field is generated, and the first magneto-optical crystal 31 in the magnetic field of coil 5 is rotated 45 ° (-45 °) counterclockwise in the direction shown in the figure. As shown in fig. 4 and 5, the direction of propagation from the first optical fiber 111 > the fourth optical fiber 122 is analyzed. The light beam incident from the first optical fiber 111 is split into two polarized lights perpendicular to each other by the polarization splitting surface 212 of the first polarization splitting prism 21, the polarization direction of the transmitted light is the horizontal direction (P direction), and the polarization direction of the reflected light is the vertical direction (S direction). The polarization direction of the transmitted light is along the horizontal x-axis, denoted as 111p, and the polarization direction of the reflected light is along the y-axis, denoted as 111 s. The reflected light beam 111s reaches the first magneto-optical crystal 31 after being reflected by the total reflection surface 211 of the first polarization splitting prism 21. As shown in fig. 4, the two beams of transmitted light 111p and reflected light 111s pass through the first magneto-optical crystal 31 and rotate by-45 ° to become polarized light 111p 'and 111 s', and then pass through the first wave plate 41 and rotate by +45 °, the polarization direction of the 111p light in the original x-axis direction is unchanged and is denoted as 122p, and the polarization direction of the 111s light in the original y-axis direction is unchanged and is denoted as 122 s. The 122p light beam is reflected by the total reflection surface 223 of the second polarization beam splitter prism 22 and then reaches the polarization beam splitting surface 222, and finally the 122p light beam and the 122s light beam are synthesized by the polarization beam splitting surface 222 of the second polarization beam splitter prism 22 and then reflected by the total reflection surface 221 of the second polarization beam splitter prism 22 and then output to the fourth optical fiber 122. It can be seen in fig. 4 that the propagation from the first optical fiber 111 > the fourth optical fiber 122 direction, the-45 ° rotation of the first magneto-optical crystal 31 and the +45 ° rotation of the first wave plate 41 are destructive, resulting in a 0 ° rotation of the polarized light.

As shown in fig. 4 and 6, the second optical fiber 112 > the third optical fiber 121 are analyzed for propagation. The light beam incident from the second optical fiber 112 is reflected by the total reflection surface 213 of the first polarization splitting prism 21, reaches the polarization splitting surface 212, and is split into two mutually perpendicular polarized lights by the polarization splitting surface 212 of the first polarization splitting prism 21, where the polarization direction of the transmitted light is the horizontal direction (P direction) and the polarization direction of the reflected light is the vertical direction (S direction). The polarization direction of the transmitted light is along the horizontal x-axis, denoted 112p, and the polarization direction of the reflected light is along the y-axis, denoted 112 s. The transmitted beam 112p reaches the first magneto-optical crystal 31 after being reflected by the total reflection surface 211 of the first polarization splitting prism 21. As shown in fig. 4, the two beams of light, the transmitted beam 112p and the reflected beam 112s, pass through the first magneto-optical crystal 31 and rotate by-45 ° to become polarized light 112p 'and 112 s', pass through the first wave plate 41 and rotate by +45 °, the polarization direction of the 111p light in the original x-axis direction is unchanged and is marked as 121p, and the polarization direction of the 111s light in the original y-axis direction is unchanged and is marked as 121 s. The 121s light beam is reflected by the total reflection surface 223 of the second polarization beam splitter prism 22 and then reaches the polarization beam splitting surface 222, and finally is combined by the polarization beam splitting surface 222 of the second polarization beam splitter prism 22 and output by the third optical fiber 121. It can be seen from fig. 4 that the-45 ° rotation of the first magneto-optical crystal 31 and the +45 ° rotation of the first wave plate 41 are superimposed by the propagation from the second fiber 112 — > the third fiber 121, resulting in a 90 ° rotation of the polarized light. It can be seen in fig. 4 that the propagation from the second optical fiber 112- > the third optical fiber 121 is cancelled by-45 ° of the rotation of the first magneto-optical crystal 31 and +45 ° of the rotation of the first wave plate 41, resulting in a 0 ° rotation of the polarized light.

Example 2:

referring to fig. 8, the 2x2 magneto-optical switch of the present embodiment includes a first collimator 11, an optical core assembly, a coil 5, and a second collimator 12. The optical core assembly comprises a first wedge angle sheet 61, a third polarization beam splitter prism 23, a first magneto-optical crystal 31, a first wave plate 41, a fourth polarization beam splitter prism 24 and a second wedge angle sheet 62 which are sequentially arranged from left to right. The third polarization beam splitter prism 23 includes a first total reflection surface 231, a polarization beam splitting surface 232, and a second total reflection surface 233, wherein the first total reflection surface 231, the second total reflection surface 233, and the polarization beam splitting surface 232 are parallel; the fourth polarization splitting prism 24 includes a first total reflection surface 241, a polarization splitting surface 242, and a second total reflection surface 243, and the first total reflection surface 241, the second total reflection surface 243, and the polarization splitting surface 242 are parallel. The light beams input and output by the two planes of the total reflection plane and the polarization splitting plane are parallel light, the transmission direction of the light beams is changed through the first wedge angle piece 61 and the second wedge angle piece 62, the parallel light beams are changed into light beams with a certain included angle, and the included angle corresponding to two optical fibers of the double-optical-fiber collimator is matched through the angle design of the wedge angle pieces. The transmission and optical path principles of the light beam in the optical fiber are shown in fig. 1-6.

Example 3:

referring to fig. 9, the 2x2 magneto-optical switch of the present embodiment includes a first collimator 11, an optical core assembly, a coil 5, and a second collimator 12. The optical core assembly comprises a first ridge prism 71, a third polarization beam splitter prism 23, a first magneto-optical crystal 31, a first wave plate 41, a fourth polarization beam splitter prism 24 and a second ridge prism 72 which are sequentially arranged from left to right. The third polarization beam splitter prism 23 includes a first total reflection surface 231, a polarization beam splitting surface 232, and a second total reflection surface 233, wherein the first total reflection surface 231, the second total reflection surface 233, and the polarization beam splitting surface 232 are parallel; the fourth polarization splitting prism 24 includes a first total reflection surface 241, a polarization splitting surface 242, and a second total reflection surface 243, and the first total reflection surface 241, the second total reflection surface 243, and the polarization splitting surface 242 are parallel. The light beams input and output by the total reflection surface and the polarization splitting surface are parallel light, the transmission direction of the light beams is changed through the first roof prism 71 and the second roof prism 72, the parallel light beams are changed into light beams with a certain included angle, and the included angle corresponding to two optical fibers of the double-optical-fiber collimator is matched through the angle design of the roof prism. The transmission and light path principle of the light beam in the optical fiber are shown in figures 1-6.

Example 4:

referring to fig. 10, the 2 × 2 magneto-optical switch in this embodiment includes a first collimator 11, an optical core assembly, a coil 5, and a second collimator 12. The optical core component comprises a first refraction angle prism 81, a third polarization splitting prism 23, a first magneto-optical crystal 31, a first wave plate 41, a fourth polarization splitting prism 24 and a second refraction angle prism 82 which are sequentially arranged from left to right. The third polarization beam splitter prism 23 includes a first total reflection surface 231, a polarization beam splitting surface 232, and a second total reflection surface 233, wherein the first total reflection surface 231, the second total reflection surface 233, and the polarization beam splitting surface 232 are parallel; the fourth polarization splitting prism 24 includes a first total reflection surface 241, a polarization splitting surface 242, and a second total reflection surface 243, and the first total reflection surface 241, the second total reflection surface 243, and the polarization splitting surface 242 are parallel. The light beams input and output by the two planes of the total reflection surface and the polarization splitting surface are parallel light, the transmission direction of the light beams is changed through the first folding prism 81 and the second folding prism 82, the parallel light beams are changed into light beams with a certain included angle, and the included angle corresponding to the two optical fibers of the dual-optical-fiber collimator is matched through the angle design of the folding prisms. The transmission and light path principle of the light beam in the optical fiber are shown in figures 1-6.

Preferably, in the embodiments of the present invention, both the forward direction and the reverse direction constitute a 2x2 magneto-optical switch.

Preferably, in the embodiments of the present invention, a mirror or a refractive prism may be externally disposed, and the magneto-optical switching function based on the single-fiber collimator and the dual-fiber collimator is also implemented.

Preferably, in the embodiments of the present invention, both the 2x2 magneto-optical switch can be used as the 1x2 magneto-optical switch and the 2x1 magneto-optical switch.

Preferably, in the embodiments of the present invention, an external mirror or a reflecting prism is added, so that a single-side fiber-outgoing reflective 2x2 magneto-optical switch can be implemented.

Preferably, in the embodiments of the present invention, an external isolator or isolator core is added, so that a 2x2 magneto-optical switch with high reverse isolation can be realized.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

Claims (6)

1. A 2x2 magneto-optical switch, comprising: the optical collimator comprises a first collimator, an optical core component, a coil and a second collimator which are sequentially arranged from left to right; the first collimator comprises first and second optical fibers; the second collimator comprises third and fourth optical fibers; the coil generates magnetic fields in different directions according to the electrifying direction to realize that the light beam of the first optical fiber is coupled into the third optical fiber, the light beam of the second optical fiber is coupled into the fourth optical fiber or the light beam from the first optical fiber is coupled into the fourth optical fiber, and the light beam of the second optical fiber is coupled into the third optical fiber; the coil generates a forward magnetic field and a reverse magnetic field according to the current direction, and controls the optical rotation direction of the first magneto-optical crystal to be forward and reverse; the first collimator collimates the light from the first and the two optical fibers into parallel light beams, or guides the parallel light beams into the first and the two optical fibers; the second collimator collimates the light from the third and the fourth optical fibers into parallel beams, or guides the parallel beams into the third and the fourth optical fibers.

2. A 2x2 magneto-optical switch according to claim 1, wherein: the optical kernel component comprises a first polarization beam splitter prism, a first magneto-optical crystal, a first wave plate and a second polarization beam splitter prism which are sequentially arranged from left to right; the first polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface, and the first total reflection surface, the second total reflection surface and the polarization beam splitting surface are not parallel; the second polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface; the first total reflection surface, the second total reflection surface and the polarization beam splitting surface are not parallel.

3. A 2x2 magneto-optical switch according to claim 1, wherein: the optical kernel component comprises a first wedge angle sheet, a third polarization beam splitter prism, a first magneto-optical crystal, a first wave plate, a fourth polarization beam splitter prism and a second wedge angle sheet which are sequentially arranged from left to right; the third polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface which are parallel; the fourth polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface which are parallel; the optical core component changes the transmission direction of the light beam through the first wedge angle sheet and the second wedge angle sheet, and changes the parallel light beam into the light beam with a set included angle.

4. A 2x2 magneto-optical switch according to claim 1, wherein: the optical kernel component comprises a first ridge prism, a third polarization beam splitter prism, a first magneto-optical crystal, a first wave plate, a fourth polarization beam splitter prism and a second ridge prism which are sequentially arranged from left to right; the third polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface which are parallel; the fourth polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface which are parallel; the optical kernel component changes the transmission direction of the light beam through the first roof prism and the second roof prism, and changes the parallel light beam into the light beam with a set included angle.

5. A 2x2 magneto-optical switch according to claim 1, wherein: the optical core component comprises a first refraction angle prism, a third polarization splitting prism, a first magneto-optical crystal, a first wave plate, a fourth polarization splitting prism and a second refraction angle prism which are arranged from left to right in sequence; the third polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface which are arranged in parallel, and the fourth polarization beam splitter prism comprises a first total reflection surface, a polarization beam splitting surface and a second total reflection surface which are arranged in parallel; the optical core assembly changes the transmission direction of the light beams through the first folding prism and the second folding prism and changes the parallel light beams into the light beams with set included angles.

6. An assembly debugging method of a 2x2 magneto-optical switch is characterized by comprising the following steps:

step S1, assembling the optical core assembly by micro-optics bonding;

step S2, pasting the optical kernel component in the outer sleeve;

step S3, covering the coil on the outer side of the outer sleeve outside the optical core component;

step S4: after the coil is electrified, the two optical fibers of the first collimator are input with optical signals, the optical signals of the two optical fibers of the second collimator are monitored, the two collimators are adjusted simultaneously, and when indexes meet preset requirements, the first collimator and the second collimator are fixed in the outer sleeve by glue.

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