Isolator, optical module, and optical communication system

Abstract

The embodiment of the invention provides an isolator, an optical module and an optical communication system, relates to the technical field of optics, and is used for realizing a multi-core bidirectional isolator. The isolator comprises a first light splitting part, a deflection part, a light rotation part and a second light splitting part which are sequentially arranged in the optical axis direction. The deflection component comprises a first area and a second area which are different in polarization direction. In a first scene, the first light splitting component receives a first light beam, splits the first light beam, and emits the split light beam to a first area of the deflection component; the second light splitting component receives the second light beam, splits the second light beam, and emits the split light beam to the second area of the deflection component. Light is transmitted to the deflection component after being split by the first light splitting component, and the light after being split is transmitted to the second light splitting component after being deflected in polarization direction by the deflection component and the optical rotation component in sequence, and is emitted after being transmitted by the second light splitting component.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and in particular to an isolator, an optical module, and an optical communication system. Background Art

[0002] Isolators are commonly used optical devices in optical communication systems. They create a unidirectional optical path, thereby reducing interference from reflected light. However, for multi-port devices, isolators only allow unidirectional light transmission and cannot achieve bidirectional isolation. Summary of the Invention

[0003] The embodiments of the present application provide an isolator, an optical module, and an optical communication system for realizing a multi-core bidirectional isolator.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] According to a first aspect of an embodiment of the present application, an isolator is provided, comprising: a first spectroscopic component, a deflection component, a rotation component, and a second spectroscopic component arranged in sequence along the optical axis. The deflection component comprises a first region and a second region with different polarization directions. Light is incident on the first spectroscopic component, and after being split by the first spectroscopic component, it is transmitted to the deflection component. The split light passes through the deflection component and the rotation component in sequence to deflect the polarization direction and is transmitted to the second spectroscopic component. After being transmitted by the second spectroscopic component, it is emitted. In the first scenario, the first spectroscopic component receives the first light beam, splits the first light beam, and transmits the split light beam to the first region of the deflection component; the second spectroscopic component receives the second light beam, splits the second light beam, and transmits the split light beam to the second region of the deflection component.

[0006] The isolator provided in an embodiment of the present application, the deflection component may include a first area and a second area with different polarization directions. The first light beam is incident on the first area of ​​the deflection component, and the second light beam is incident on the second area of ​​the deflection component. Different polarization directions can be set according to the isolation direction to achieve isolation of different light rays in different directions.

[0007] In one possible implementation, in the second scenario, the first beam splitting component receives the first beam, splits the first beam, and directs the split beams into the first region of the deflection component; the first beam splitting component receives the second beam, splits the second beam, and directs the split beams into the second region of the deflection component. Thus, an embodiment of an isolator is provided.

[0008] In one possible implementation, in the third scenario, the second beam splitting component receives the first beam, splits the first beam, and directs the split beams into the first region of the deflection component; the second beam splitting component receives the second beam, splits the second beam, and directs the split beams into the second region of the deflection component. This provides an embodiment of an isolator.

[0009] In one possible implementation, the optical rotation component is configured to receive light output from the deflection component and is also configured to receive light output from the second light splitting component. Thus, light output from the deflection component can be incident on the optical rotation component, and light output from the second light splitting component can also be incident on the optical rotation component.

[0010] In one possible implementation, the isolator further includes a first lens component and a second lens component, and the first lens component and the second lens component are respectively disposed on opposite sides of the optical rotation component. In this way, the first lens component and the second lens component can collimate the light.

[0011] In one possible implementation, the first lens component includes a first collimating lens and a first diffusion lens; the first collimating lens is disposed between the first beam splitting component and the deflecting component, and the first diffusion lens is disposed between the first collimating lens and the deflecting component; the second lens component includes a second collimating lens and a second diffusion lens; the second collimating lens is disposed between the second beam splitting component and the optical rotation component, and the second diffusion lens is disposed between the optical rotation component and the first collimating lens. In this way, the first and second lens components can collimate the light and increase the distance between the light rays.

[0012] In a possible implementation, the distance between the first diffusion lens and the deflection component is equal to the focal length of the first diffusion lens. In this way, the spot of the light beam incident on the deflection component is smaller.

[0013] In one possible implementation, the first lens component includes a first collimating lens disposed between the deflecting component and the optical rotation component; the second lens component includes a second collimating lens disposed between the optical rotation component and the second light-splitting component. In this manner, the first and second lens components can collimate light.

[0014] In one possible implementation, the deflection component further includes a third region; the first beam splitting component receives the third light beam, splits the third light beam, and directs the split light beams into the third region of the deflection component; the polarization direction of the third region is the same as the deflection direction of the first region or the deflection direction of the second region. In this way, the deflection component can include different regions corresponding to the number of incident light rays.

[0015] In a possible implementation, the material of the first light-splitting component includes a birefringent crystal. In this way, an embodiment of an isolator is provided.

[0016] In a possible implementation, the material of the second light-splitting component includes a birefringent crystal. In this way, an embodiment of an isolator is provided.

[0017] In a possible implementation, the deflection component includes a half-wave plate. In this way, an embodiment of an isolator is provided.

[0018] In a possible implementation, one of the deflection angles of the first region and the second region is 45° and −45°, respectively. In this way, the deflection angles of different regions of the deflection component are set accordingly according to the isolation direction.

[0019] In a possible implementation, the optical rotation component includes an optical rotation plate. Thus, an embodiment of an isolator is provided.

[0020] In a possible implementation, the deflection angle of the optical rotation component is 45°. In this way, the deflection angle of the optical rotation component is set according to the isolation direction.

[0021] In a possible implementation, the material of the optically active component includes magneto-optical crystal. Thus, an embodiment of an isolator is provided.

[0022] According to a second aspect of an embodiment of the present application, an optical module is provided, comprising an optical receiving component and an optical transmitting component, wherein the optical receiving component receives an optical signal transmitted by the optical transmitting component; and the optical receiving component comprises an isolator as described in any one of the first aspects.

[0023] The optical module provided in the second aspect of the embodiment of the present application includes the isolator of any one of the first aspects, and its beneficial effects are the same as those of the isolator, which will not be repeated here.

[0024] In one possible implementation, the optical module further includes a first optical interface and a second optical interface; the isolator includes a first beam splitter, a deflection component, a light rotator, and a second beam splitter, arranged in sequence along the optical axis; the first optical interface is located on a side of the first beam splitter away from the deflection component, and the second optical interface is located on a side of the second beam splitter away from the light rotator. In this manner, both the first and second optical interfaces can receive and transmit light.

[0025] In one possible implementation, the optical module further includes a first multi-core optical fiber and a second multi-core optical fiber; the first multi-core optical fiber is disposed within the first optical interface, and the second multi-core optical fiber is disposed within the second optical interface. This improves the integration of the isolator and provides an implementation method for the isolator.

[0026] In one possible implementation, the optical module further includes a first optical fiber array and a second optical fiber array; the first optical fiber array is disposed in the first optical interface, and the second optical fiber array is disposed in the second optical interface. Thus, an embodiment of an isolator is provided.

[0027] According to a third aspect of an embodiment of the present application, an optical module is provided, comprising an optical receiving component and an optical transmitting component, wherein the optical receiving component receives an optical signal transmitted by the optical transmitting component; and the optical transmitting component comprises an isolator as described in any one of the first aspects.

[0028] The optical module provided in the third aspect of the embodiment of the present application includes the isolator of any one of the first aspects, and its beneficial effects are the same as those of the isolator, which will not be repeated here.

[0029] A fourth aspect of the embodiments of the present application provides an optical communication system comprising at least two optical communication devices and an optical fiber; the optical communication devices are connected via the optical fiber; and the optical communication devices comprise the optical module according to the second or third aspect.

[0030] The optical communication system provided in the fourth aspect of the embodiment of the present application includes the optical module of the second aspect or the third aspect, and its beneficial effects are the same as those of the optical module, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of an optical communication system provided in an embodiment of the present application;

[0032] Figure 2A A schematic diagram of the structure of an optical module according to an embodiment of the present application;

[0033] Figure 2B A schematic diagram of the structure of another optical module according to an embodiment of the present application;

[0034] Figure 3A A schematic diagram of the structure of an optical signal transmission within a fiber core according to an embodiment of the present application;

[0035] Figure 3B This is a schematic diagram of another structure of optical signal transmission within a fiber core according to an embodiment of the present application;

[0036] Figure 4 This is a schematic diagram of the structure of another optical module according to an embodiment of the present application;

[0037] Figure 5 A schematic structural diagram of an isolator provided in an embodiment of the present application;

[0038] Figure 6 A schematic structural diagram of a deflection component provided in an embodiment of the present application;

[0039] Figure 7A A schematic structural diagram of another isolator provided in an embodiment of the present application;

[0040] Figure 7B A schematic structural diagram of another isolator provided in an embodiment of the present application;

[0041] Figure 8 A schematic structural diagram of another isolator provided in an embodiment of the present application;

[0042] Figure 9 A schematic structural diagram of another isolator provided in an embodiment of the present application;

[0043] Figure 10A A schematic diagram of the structure of a multi-core optical fiber according to an embodiment of the present application;

[0044] Figure 10B A schematic diagram of the structure of an optical fiber array according to an embodiment of the present application;

[0045] Figure 10C A schematic structural diagram of another optical fiber array according to an embodiment of the present application;

[0046] Figure 11A A schematic structural diagram of another isolator provided in an embodiment of the present application;

[0047] Figure 11B A schematic structural diagram of another isolator provided in an embodiment of the present application.

[0048] Figure 12A A schematic structural diagram of another isolator provided in an embodiment of the present application;

[0049] Figure 12B A schematic structural diagram of another isolator provided in an embodiment of the present application.

[0050] Reference numerals

[0051] 1-optical communication system; 2-optical line terminal; 3-optical distribution network; 4-optical network unit; 5-optical network terminal; 10-optical module; 11-first port; 12-second port; 21-first lens; 22-second lens; 31-fan-out device; 32-fan-in device; 100-isolator; 110-first light-splitting component; 120-second light-splitting component; 210-deflection component; 211-first region; 212-second region; 213-third region; 214-fourth region; 220-optical rotation component; 310-first lens component; 311-first collimating lens; 312-first diffusion lens; 320-second lens component; 321-second collimating lens; 322-second diffusion lens; 410-first optical interface; 420-second optical interface; 101-cladding; 102-fiber core. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0053] Hereinafter, the terms "second," "first," etc., are used for descriptive convenience only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature qualified as "second," "first," etc., may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0054] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left", and "right" may be defined including but not limited to the orientation relative to the schematic placement of the components in the drawings. It should be understood that these directional terms may be relative concepts, which are used for relative descriptions and clarifications, and may change accordingly according to changes in the orientation of the components in the drawings.

[0055] In the embodiments of this application, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, "connection" can mean fixed connection, detachable connection, or integration; it can mean direct connection or indirect connection through an intermediate medium. In addition, the term "coupling" can mean direct electrical connection or indirect electrical connection through an intermediate medium. The term "contact" can mean direct contact or indirect contact through an intermediate medium.

[0056] In the embodiments of the present application, "and / or" describes the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0057] To facilitate understanding of the technical solution, the technical terms involved in this application are explained below.

[0058] Focal power: Equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam, it characterizes the refractive power of an optical system for incident parallel beams. Focal power is generally expressed as φ; a larger value of φ indicates a greater degree of refraction of the parallel beam. When φ > 0, the refraction is convergent; when φ < 0, the refraction is divergent. When φ = 0, it is plane refraction, meaning that an axially parallel beam remains axially parallel after refraction, without refraction.

[0059] Focal length (f), also known as focal length, is a measure of the convergence or divergence of light in an optical system. It refers to the vertical distance from the optical center of a lens or lens group to the imaging surface when an infinitely distant scene forms a clear image on the imaging surface through a lens or lens group.

[0060] Positive power: The lens or lens group has a positive focal length and has the effect of converging light.

[0061] Negative power: The lens or lens group has a negative focal length and has the effect of diverging light.

[0062] The optical axis is a line of light that passes perpendicularly through the center of an ideal lens. When light rays parallel to the optical axis enter a convex lens, all the rays converge at a single point behind the lens. This point is the focal point.

[0063] The technical solutions in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0064] The embodiment of the present application provides an optical communication system. Figure 1 As shown, the optical communication system 1 mainly includes at least two optical communication devices and optical fibers connecting the optical communication devices.

[0065] Optical communication systems have become the current mainstream communication network systems. For example, in an optical communication system 1, the access method of the access network (AN) is fiber access (FTTx), which is also called an optical access network (OAN). The fiber access methods of the optical access network include fiber to the cabinet (FTTCab), fiber to the curb (FTTC), fiber to the building (FTTB) and fiber to the home (FTTH).

[0066] Alternatively, for example, in the optical communication system 1, the transport network may include microwave, multi-service transmission platform (MSTP), wavelength division multiplexing (WDM), and packet transport network (PTN). In the embodiment of the present application, the optical communication system 1 may include an access network or a transport network. This embodiment of the present application does not limit this, and may be reasonably configured according to actual conditions.

[0067] In some embodiments, the optical communication system 1 is integrated into an electronic device. The electronic device may include, for example, a server, a switch, a fiber optic network card, and a fiber optic transceiver. The optical communication system 1 may be integrated into the same electronic device or integrated into different electronic devices. This embodiment of the present application does not limit this, and may be configured appropriately based on actual circumstances.

[0068] Exemplarily, when a passive optical network (PON) is used as an optical communication system, the optical communication equipment may include, for example, any one of an optical line terminal (OLT), an optical network unit (ONU), or an optical network terminal (ONT).

[0069] The implementation of this application does not limit the specific types and structures of the optical communication system 1 and the optical communication equipment, and they can be reasonably configured according to actual conditions.

[0070] The optical communication system is a passive optical fiber network. Figure 1 As shown, the PON includes an optical line terminal 2 , an optical distribution network (ODN) 3 , an optical network unit 4 and an optical network terminal 5 .

[0071] OLT2 is located in the central control station, and ODN3 is located on the user side. OND3 connects OLT2 and ONU4. The optical components in OLT2 and ONU4 convert and transmit network signals from optical to electrical sources.

[0072] In some embodiments, as Figure 1 As shown, ONT5 and ONU4 are arranged at different positions on the user side and implement similar functions.

[0073] ODN3 consists of an optical splitter (SPL) and optical fibers. The function of the optical splitter is to split one light path into two paths based on a certain splitting ratio, and then transmit the two light paths to different ONUs 4 / ONTs 5. Generally, the more optical splitters cascaded in ODN3, the more light can be split, and the more light paths can be generated.

[0074] For example, OLT2 is located at the central control station, and ODN3 is located on the user side. ODN3 connects OLT2 and ONU4. The optical modules in OLT2 and ONU4 convert network signals into optical and electrical signals and transmit them. ONT5 and ONU4 are located at different locations on the user side and perform similar functions.

[0075] The optical module may be integrated into the above-mentioned ONU4 or ONT5, or may be integrated into the above-mentioned OLT2.

[0076] It is explained here that the optical communication system 1 includes but is not limited to an access network and a transmission network.

[0077] For example, the optical module may include a small form-factor pluggable optical transceiver (SFP) optical module, an SFP+ optical module, or an XFP optical module, etc. This application does not limit this.

[0078] In some embodiments, the optical module includes a transmitting optical subassembly (TOSA) and a receiving optical subassembly (ROSA), wherein both the transmitting optical subassembly and the receiving optical subassembly are electrically connected to a printed circuit board.

[0079] For example, a bi-directional optical subassembly (BOSA) formed by integrating an optical transmitting assembly and an optical receiving assembly can be regarded as an optical assembly, or as the above-mentioned optical module.

[0080] Exemplarily, the optical emission assembly includes an electro-optical conversion chip and a photodiode (e.g., a monitoring photodiode) (MD). The electro-optical conversion chip and the monitoring photodiode are packaged together to form the optical emission assembly. The monitoring photodiode is used to monitor the optical power output by the laser.

[0081] The electro-optical conversion chip receives the electrical signal carrying the transmission information transmitted by the printed circuit board (PCB), converts the electrical signal into an optical signal, and then outputs the optical signal through the optical device.

[0082] Exemplarily, the light receiving component includes a photoelectric conversion chip and an amplifier. The photoelectric conversion chip and the amplifier are packaged together to form a light receiving component. The photoelectric conversion chip can be, for example, a chip composed of a photodiode (PD), a chip composed of a PIN diode (PIN diode), or a chip composed of an avalanche photon diode (APD). The photoelectric conversion chip converts the received optical signal into an electrical signal, and then transmits the electrical signal to the amplifier, which amplifies the electrical signal and transmits the amplified electrical signal to a printed circuit board.

[0083] Exemplarily, the isolator is used in a light emitting component. Alternatively, exemplary, the isolator is used in a light receiving component.

[0084] At this time, the isolator is used to isolate the received optical signal. By setting up the isolator, the impact of the reflected optical signal on the optical device can be reduced, ensuring the stability of the optical signal generated by the light source.

[0085] In some embodiments, as Figure 2A As shown, the optical module 10 includes a first port 11 , an isolator 100 and a second port 12 .

[0086] For example, light is incident from the first port 11 of the optical module 10 to the isolator 100, and then, after being isolated by the isolator 100, is transmitted to the second port and output from the second port 12. In this case, the first port 11 serves as the input port of the optical module 10, and the second port 12 serves as the output port of the optical module 10.

[0087] It is noted that a first lens is provided on the light-exiting side of the first port 11 and the light-entering side of the isolator 100, and a second lens is provided on the light-exiting side of the isolator 100 and the light-entering side of the second port 12. The first lens is used to collimate light incident on the isolator 100, and the second lens is used to collimate light incident on the second port 12.

[0088] For example, Figure 2A The diagram shows a single-core optical fiber, that is, a single beam of light is transmitted through the isolator 100 of the optical module 10 .

[0089] In other embodiments, a light module 10 that transmits multiple light beams is shown. Figure 2B As shown, the optical module 10 includes a first port 11 , an isolator 100 and a second port 12 .

[0090] Take the example that the first port 11 includes two fiber cores and the second port 12 includes two fiber cores. Figure 2B As shown, the first port 11 includes a first fiber core 11 a and a second fiber core 11 b , and the second port 12 includes a third fiber core 12 a and a fourth fiber core 12 b .

[0091] Exemplarily, the light emitted from the first fiber core 11a and the second fiber core 11b of the first port 11 is collimated by the first lens 21 and then incident on the isolator 100. The light emitted from the isolator 100 is collimated by the second lens 22 and then incident on the third fiber core 12a and the fourth fiber core 12b of the second port 12 respectively.

[0092] That is, light from different fiber cores is incident on the isolator 100 along different directions. After passing through the isolator 100, different light is emitted from different fiber cores along different directions.

[0093] Exemplarily, the distance between the first lens 21 and the isolator 100 is the focal length of the first lens 21. That is, the light entrance of the isolator 100 is disposed at the focal point of the first lens 21.

[0094] Exemplarily, the distance between the second lens 22 and the isolator 100 is the focal length of the second lens 22. That is, the light outlet of the isolator 100 is disposed at the focal point of the second lens 22.

[0095] This can better collimate and focus the light.

[0096] What is explained here is that Figure 2B The transmission of light in the optical module 10 is similar to the above Figure 2A The light transmission in the illustrated optical module 10 is similar, and reference may be made to the above description of the light transmission.

[0097] The above optical module 10 can realize single-core single-beam light transmission, and can also realize multi-core multi-beam light transmission. However, the optical module 10 can only realize the passage of unidirectional optical signals. In other words, the above optical module 10 is mainly used for multi-core unidirectional communication scenarios. Figure 3A As shown, the first port 11 and the second port 12 only allow unidirectional and co-directional light transmission. For example, the light transmitted by the fiber core 1, the fiber core 2, the fiber core 3 and the fiber core 4 are all in the same direction.

[0098] In order to achieve bidirectional communication of the optical module 10, as Figure 3B As shown, the first port 11 and the second port 12 can both allow bidirectional light transmission. For example, the light transmitted by core 1 and core 3 is in the same direction, the light transmitted by core 2 and core 4 is in the same direction, and the light transmitted by core 1 and core 2 is in opposite directions.

[0099] Based on this, in order to realize bidirectional light transmission, the embodiment of the present application also illustrates an optical module 10. Figure 4 As shown, the optical module 10 includes a first port 11 , a fan-out device 31 , an isolator 100 , a fan-in device 32 and a second port 12 .

[0100] The first port 11 includes multiple fiber cores, and the multiple fiber cores can transmit light in both directions. The second port 12 includes multiple fiber cores, and the multiple fiber cores can transmit light in both directions. The isolator 100 can be used to achieve isolation in a specified direction, and the isolator 100 can pass unidirectional light. For example, part of the isolator 100 can pass light from the first port 11 to the second port 12, and part of the isolator 100 can pass light from the second port 12 to the first port 11. The fan-out device 31 can be used to separate multiple beams of light and transmit them to the corresponding isolator 100 respectively. The fan-in device 32 can be used to transmit multiple beams of light from the isolator 100 to the second port 12.

[0101] Exemplarily, the multiple beams of light emitted from the multiple fiber cores of the first port 11 are separated by the fan-out device 31 and then transmitted to different isolators 100 respectively to achieve a predetermined isolation direction of the light, and then the multiple beams of light are transmitted to the multiple fiber cores of the second port 12 through the fan-in device 32.

[0102] Alternatively, illustratively, the multiple beams of light emitted from the multiple fiber cores of the second port 12 are separated by the fan-in device 32 and then transmitted to different isolators 100 respectively to achieve a predetermined isolation direction of the light, and then the multiple beams of light are transmitted to the multiple fiber cores of the first port 11 through the fan-out device 31.

[0103] In this way, the optical module 10 can achieve multi-core bidirectional isolation.

[0104] However, Figure 4 The optical module 10 shown involves many optical components. For example, each light beam corresponds to an isolator, and the optical path is complex. At the same time, the connection between multiple optical components will cause large loss.

[0105] Based on this, the embodiments of the present application illustrate an optical device, which may be, for example, the aforementioned isolator. The isolator can be applied to any of the aforementioned optical communication systems, optical modules, or optical components. It is noted that the wavelength division multiplexer can be applied, but is not limited to, the aforementioned access networks or transport networks. For ease of illustration, the following description uses an isolator as the optical device illustrated in the embodiments of the present application.

[0106] The embodiment of the present application provides an isolator, such as Figure 5 As shown, the isolator 100 includes a first light splitting component 110 , a deflecting component 210 , a light rotating component 220 and a second light splitting component 120 , which are sequentially arranged along the optical axis.

[0107] In the embodiment of the present application, light is incident on the first light-splitting component 110, and after being split by the first light-splitting component 110, it is transmitted to the deflection component 210. The split light passes through the deflection component 210 and the rotation component 220 in turn to deflect the polarization direction and then is transmitted to the second light-splitting component 120, and is refracted by the second light-splitting component 120 and then emitted.

[0108] It is explained here that light can also be incident on the second light-splitting component 120, and after being split by the second light-splitting component 120, it is transmitted to the optical rotation component 220. The split light is deflected in the polarization direction by the optical rotation component 220 and the deflection component 210 in sequence, and then transmitted to the first light-splitting component 110, and is refracted by the first light-splitting component 110 before being emitted.

[0109] In some embodiments, as Figure 6As shown, the deflection component 210 may include a plurality of regions. That is, the deflection component 210 may be divided into a plurality of regions, each of which receives a single light beam.

[0110] That is, multiple areas can receive multiple light beams, and one light beam is irradiated onto one area of ​​the deflection component 210 .

[0111] The multiple regions may be arranged in an array, that is, the multiple regions are arranged along a two-dimensional direction.

[0112] In this way, the isolation and integration of incident light can be improved.

[0113] The polarization direction of at least one region among the plurality of regions of the deflection element 210 is different from the deflection directions of the other regions.

[0114] For example, Figure 6 As shown, the deflection component 210 may include a first region 211 and a second region 212. The polarization directions of the first region 211 and the second region 212 are different.

[0115] For example, the light includes a first beam and a second beam, the first beam is incident on the first region 211 of the deflection component 210 , and the second beam is incident on the second region 212 of the deflection component 210 .

[0116] At this time, the deflection direction of the first light beam after being deflected by the deflection component 210 is different from the deflection direction of the second light beam after being deflected by the deflection component 210 .

[0117] In some embodiments, in the first scenario, the first beam splitting component 110 receives the first beam, splits the first beam, and directs the split beams to the first region 211 of the deflection component 210. The second beam splitting component 120 receives the second beam, splits the second beam, and directs the split beams to the second region 212 of the deflection component 210.

[0118] In other embodiments, in the second scenario, the first beam splitting component 110 receives the first beam, splits the first beam, and directs the split beams to the first region 211 of the deflection component 210. The first beam splitting component 110 receives the second beam, splits the second beam, and directs the split beams to the second region 212 of the deflection component 210.

[0119] In some further embodiments, in the third scenario, the second light-splitting component 120 receives the first light beam, splits the first light beam, and directs the split light beams to the first region 211 of the deflection component 210. The second light-splitting component 120 receives the second light beam, splits the second light beam, and directs the split light beams to the second region 212 of the deflection component 210.

[0120] In this way, the isolator 100 provided in the embodiment of the present application can achieve bidirectional isolation of light beams according to actual needs.

[0121] For example, the material of the first light splitting component 110 may include birefringent crystal.

[0122] In this way, the first light splitting component 110 can split the received light beam into two sub-beams with different polarization directions, and the first light splitting component 110 can also change the transmission direction of the incident sub-beams with different polarization directions.

[0123] Alternatively, for example, the material of the second light-splitting component 120 may include a birefringent crystal.

[0124] In this way, the second light splitting component 120 can split the received light beam into two sub-beams with different polarization directions, and the second light splitting component 120 can also change the transmission direction of the incident sub-beams with different polarization directions.

[0125] In the embodiment of the present application, the material of the first light splitting component 110 and the material of the second light splitting component 120 can be the same or different. This embodiment of the present application does not limit this, and can be reasonably set according to actual conditions. For example, the deflection component 210 can include a half-wave plate.

[0126] For example, one of the deflection angles of the first region 211 and the second region 212 may be 45° and −45°.

[0127] That is, the deflection angle of the first region 211 is 45°, and the deflection angle of the second region is -45°. Alternatively, the deflection angle of the first region 211 is -45°, and the deflection angle of the second region is 45°. This embodiment of the present application is not limited to this, and it is sufficient that the deflection angle of the first region 211 is different from the deflection angle of the second region 212.

[0128] Or, for example, Figure 6 As shown, the deflection member 210 may further include a third region 213 .

[0129] That is, the light further includes a third light beam, and the third light beam is incident on the third area 213 of the deflecting component 210 .

[0130] Exemplarily, the first light splitting component 110 receives the third light beam, splits the third light beam, and directs the split light beams into the third region 213 of the deflecting component 210 .

[0131] The polarization direction of the third region 213 is the same as the deflection direction of the first region 211 or the deflection direction of the second region 212 .

[0132] That is, the deflection angle of the third region 213 may be the same as the deflection angle of the first region 211, and different from the deflection angle of the second region 212. Alternatively, the deflection angle of the third region 213 may be the same as the deflection angle of the second region 212, and different from the deflection angle of the first region 211. This embodiment of the present application is not limited to this.

[0133] Continue to refer Figure 6 The deflection component 210 can be divided into four areas (eg, a first area 211, a second area 212, a third area 213, and a fourth area 214), wherein the first area 211, the second area 212, the third area 213, and the fourth area 214 are arranged in an array.

[0134] It is explained here that each area receives a corresponding light beam.

[0135] In this way, the deflection directions of different areas can be set according to the different isolation directions of different light beams.

[0136] In the embodiment of the present application, there is no limitation on the number of regions included in the deflection component 210 , and the number of regions can be reasonably set according to the number of light rays transmitted by the isolator 100 .

[0137] Regarding the optical rotation component 220, Figure 5 As shown, the optical rotation component 220 is disposed between the deflection component 210 and the second light splitting component 120 .

[0138] The optical rotation component 220 can change the polarization direction of the light. For example, the optical rotation component 220 can include an optical rotation plate.

[0139] Exemplarily, the deflection angle of the optical rotation component 220 is 45°.

[0140] That is, the deflection angle of the optical rotation component 220 is the same as the deflection angle of at least one region of the deflection component 210 .

[0141] When the light is transmitted along the direction from the deflection component 210 to the optical rotation component 220, the optical rotation component 220 deflects the light at an angle of 45°. When the light is transmitted along the direction from the optical rotation component 220 to the deflection component 210, the optical rotation component 220 deflects the light at an angle of -45°.

[0142] That is, when the direction of light transmission changes, the deflection angle of the light by the optical rotation component 220 also changes accordingly.

[0143] The material of the optical rotation component 220 may include, for example, magneto-optical crystal or quartz crystal.

[0144] In some embodiments, continue to refer to Figure 5 The isolator 100 further includes a first lens component 310 and a second lens component 320 .

[0145] The first lens component 310 and the second lens component 320 are respectively disposed on two opposite sides of the optical rotation component 220 .

[0146] That is, the first lens component 310 is disposed on the side of the light rotator component 220 away from the second light splitter component 120 , and the second lens component 320 is disposed on the side of the light rotator component 220 away from the first light splitter component 110 .

[0147] For example, Figure 5 As shown, the first lens component 310 is disposed between the deflection component 210 and the optical rotation component 220 , and the second lens component 320 is disposed between the optical rotation component 220 and the second light splitting component 120 .

[0148] That is, the deflecting component 210 and the optical rotation component 220 are respectively disposed on two opposite sides of the first lens component 310 , and the optical rotation component 220 and the second light splitting component 120 are respectively disposed on two opposite sides of the second lens component 320 .

[0149] In this way, the light can be polarized in different areas of the deflection component 210 and then collimated by the first lens component 310, thereby alleviating crosstalk caused by light beams emitted from different fiber cores.

[0150] Or, for example, Figure 7A As shown, the first lens component 310 is disposed on a side of the first light splitting component 110 away from the optical rotation component 220 , and the second lens component 320 is disposed on a side of the second light splitting component 120 away from the optical rotation component 220 .

[0151] That is, the light first passes through the first lens component 310 and then is transmitted to the first light splitting component 110 .

[0152] Or, for example, Figure 7B As shown, the first lens component 310 is disposed between the first light splitting component 110 and the deflecting component 210 , and the second lens component 320 is disposed between the light rotator component 220 and the second light splitting component 120 .

[0153] That is, the first light splitting component 110 and the deflecting component 210 are respectively disposed on opposite sides of the first lens component 310 , and the light rotating component 220 and the second light splitting component 120 are respectively disposed on opposite sides of the second lens component 320 .

[0154] In this way, light can be incident on the deflection component 210 after the first lens component 310 or the second lens component 320 has expanded the distance, thereby alleviating crosstalk between light beams emitted from different fiber cores. At the same time, the impact of the processing accuracy of the deflection component 210 on the performance of the isolator 100 can also be reduced.

[0155] The embodiment of the present application does not limit the arrangement positions of the first lens component 310 and the second lens component 320 , and they can be reasonably arranged according to actual conditions.

[0156] In some embodiments, as Figure 8 As shown, the first lens component 310 includes a first collimating lens 311 , and the second lens component 320 includes a second collimating lens 321 .

[0157] That is, the first collimating lens 311 is disposed at the same position as the first lens component 310. The second collimating lens 321 is disposed at the same position as the second lens component 320. For example, the first collimating lens 311 is disposed between the deflecting component 210 and the optical rotation component 220, and the second collimating lens 321 is disposed between the optical rotation component 220 and the second light splitting component 120.

[0158] For example, Figure 8 As shown, the first light splitting component 110 and the deflecting component 210 can be arranged in a close relationship. In other words, the deflecting component 210 can be bonded to the surface of the first light splitting component 110 .

[0159] Alternatively, for example, a gap may be provided between the first light splitting component 110 and the deflecting component 210. That is, the first light splitting component 110 and the deflecting component 210 are spaced apart. This embodiment of the present application does not limit this, and may be reasonably set according to actual conditions.

[0160] In other embodiments, Figure 9 As shown, the first lens component 310 includes a first collimating lens 311 and a first diffusion lens 312 , and the second lens component 320 includes a second collimating lens 321 and a second diffusion lens 322 .

[0161] It is explained here that the first collimating lens 311 and the first diffusion lens 312 can be regarded as a whole, and their setting position is the same as the setting position of the above-mentioned first lens component 310. The second collimating lens 321 and the second diffusion lens 322 can be regarded as a whole, and their setting position is the same as the setting position of the above-mentioned second lens component 320.

[0162] Exemplarily, the first collimating lens 311 is arranged between the first light-splitting component 110 and the deflection component 210, and the first diffusion lens 312 is arranged between the first collimating lens 311 and the deflection component 210; the second collimating lens 321 is arranged between the second light-splitting component 120 and the optical rotation component 220, and the second diffusion lens 322 is arranged between the optical rotation component 220 and the first collimating lens 311.

[0163] The first diffusion lens 312 may be a convex lens, for example, and may diffuse the light. The second diffusion lens 322 may be a convex lens, for example, and may diffuse the light.

[0164] For example, the distance between the first diffusion lens 312 and the deflection component 210 is the focal length of the first diffusion lens 312. In this way, the light spot of the light beam incident on the deflection component 210 can be made smaller, thereby reducing interference between light beams.

[0165] It should be noted that the distance between the first diffusion lens 312 and the deflection component 210 is not limited in the embodiment of the present application, and can be reasonably set according to actual conditions.

[0166] For example, the distance between the second diffusion lens 322 and the deflection component 210 is the focal length of the second diffusion lens 322. In this way, the light spot of the light beam incident on the deflection component 210 can be made smaller, thereby reducing interference between light beams.

[0167] It should be noted that the distance between the second diffusion lens 322 and the deflection component 210 is not limited in the embodiment of the present application, and can be reasonably set according to actual conditions.

[0168] Light is sequentially incident on the first collimating lens 311 and the first diffuser lens 312. After being collimated by the first collimating lens 311, the light is transmitted to the first diffuser lens 312. Refraction by the first diffuser lens 312 increases the light's transmission angle, thereby increasing the distance between the light and other light rays, reducing crosstalk between the light rays, and increasing isolation. After being output by the optical rotation component 220, the light is incident on the second diffuser lens 322. It is sequentially transmitted through the second diffuser lens 322 and the second collimating lens 321 before being emitted. At this time, after passing through the second diffuser lens 322, the light's transmission angle is reduced. After being collimated by the second collimating lens 321, the light can be better coupled to the second light-splitting component 120.

[0169] Similarly, light is sequentially incident on the second collimating lens 321 and the second diffuser lens 322. After being collimated by the second collimating lens 321, the light is transmitted to the second diffuser lens 322. After being refracted by the second diffuser lens 322, the light transmission angle is increased, thereby increasing the distance between the light and other light, reducing crosstalk between the light, and increasing isolation. After being output by the deflection component 210, the light is incident on the first diffuser lens 312, and then sequentially transmitted through the first diffuser lens 312 and the first collimating lens 311 before being emitted. At this time, after passing through the first diffuser lens 312, the light transmission angle is reduced. After being collimated by the first collimating lens 311, the light can be better coupled to the first light-splitting component 110.

[0170] like Figure 9 As shown, when the first lens component 310 is disposed on the side of the deflection component 210 away from the optical rotation component 220 , the deflection component 210 can also be bonded to the optical rotation component.

[0171] Alternatively, for example, a gap may be provided between the deflection component 210 and the optical rotation component 220. In other words, the deflection component 210 and the optical rotation component 220 are spaced apart. This embodiment of the present application does not limit this, and may be reasonably set according to actual conditions.

[0172] In some embodiments, the optical module 10 further includes a first optical interface 410 and a second optical interface 420 .

[0173] It is noted that the first optical interface 410 and the second optical interface 420 can be integrated into the optical module 10. Alternatively, they can be integrated into the isolator 100. This embodiment of the present application is not limited to this. For the sake of convenience, the following description will be based on the first optical interface 410 and the second optical interface 420 being integrated into the isolator 100.

[0174] like Figure 9As shown, the first optical interface 410 is located on a side of the first light splitting component 110 away from the deflecting component 210 , and the second optical interface 420 is located on a side of the second light splitting component 120 away from the optical rotation component 220 .

[0175] Exemplarily, the light is emitted from the first optical interface 410 , and the light outputted by the second light splitting component 120 is emitted from the second optical interface 420 .

[0176] The light can also be emitted from the second optical interface 420 , and the light outputted by the first light splitting component 110 is emitted from the first optical interface 410 .

[0177] That is, the first optical interface 410 can be used as an output port of the isolator 100 or an input port of the isolator 100. The second optical interface can be used as an output port of the isolator 100 or an input port of the isolator 100.

[0178] The isolator 100 provided in the embodiment of the present application can transmit multiple beams of light, and therefore, multiple fiber cores are provided in both the first optical interface 410 and the second optical interface 420. It is explained here that the fiber cores are used to transmit light.

[0179] Regarding the arrangement of multiple fiber cores, illustratively, the optical module 10 (or isolator 100 ) may further include a first multi-core optical fiber and a second multi-core optical fiber, wherein the first multi-core optical fiber is arranged in the first optical interface 410 and the second multi-core optical fiber is arranged in the second optical interface 420 .

[0180] like Figure 10A As shown in FIG, a multi-core optical fiber is shown. A multi-core optical fiber is an optical fiber with multiple cores arranged in the cladding. Figure 10A As shown, the multi-core optical fiber includes a cladding 101 and a plurality of cores 102 disposed in the cladding 101. In the embodiment of the present application, the number of cores in the multi-core optical fiber is not limited and can be reasonably set according to actual conditions.

[0181] The multi-core optical fiber includes multiple cores 102 that can achieve bidirectional light transmission. Exemplarily, the light transmission directions of cores 102a and 102b are the same, the light transmission directions of cores 102c and 102d are the same, and the light transmission directions of cores 102a and 102c are different.

[0182] In this way, the multiple cores included in the first multi-core optical fiber can realize bidirectional transmission of light, and the multiple cores included in the second multi-core optical fiber can realize bidirectional transmission of light.

[0183] It is explained herein that disposing a multi-core optical fiber in an optical device (eg, an isolator) can increase the fiber density and the integration level of an optical communication system, an optical module, or an optical component.

[0184] Alternatively, illustratively, the isolator 100 may further include a first optical fiber array and a second optical fiber array, wherein the first optical fiber array is disposed in the first optical interface 410 , and the second optical fiber array is disposed in the second optical interface 420 .

[0185] A single-core fiber array is shown, comprising multiple single-core optical fibers. A single-core optical fiber is an optical fiber with a single core disposed within a cladding. In other words, the optical module 10 further comprises a first single-core optical fiber array and a second single-core optical fiber array. The first single-core optical fiber array is disposed within the first optical interface 410, and the second single-core optical fiber array is disposed within the second optical interface 420.

[0186] like Figure 10B As shown, the single-core optical fiber includes a cladding 101 and a core 102 disposed in the cladding 101. In the embodiment of the present application, there is no limitation on the number of optical fibers included in the optical fiber array, and it can be reasonably set according to actual conditions.

[0187] Exemplarily, the first optical fiber array includes a plurality of first single-core optical fibers, and the second optical fiber array includes a plurality of second single-core optical fibers. The number of the first single-core optical fibers and the number of the second single-core optical fibers may be the same or different.

[0188] It is clarified that among the multiple first single-core optical fibers included in the first optical fiber array, some of the first single-core optical fibers transmit light in different directions than another portion of the first single-core optical fibers. In other words, the first optical fiber array is capable of bidirectional light transmission. Among the multiple second single-core optical fibers included in the second optical fiber array, some of the second single-core optical fibers transmit light in different directions than another portion of the second single-core optical fibers. In other words, the second optical fiber array is capable of bidirectional light transmission.

[0189] Alternatively, for example, a multi-core fiber array is shown. The multi-core fiber array includes multiple multi-core optical fibers. In other words, the optical module 10 also includes a first multi-core fiber array and a second multi-core fiber array. The first multi-core fiber array is disposed within the first optical interface 410, and the second multi-core fiber array is disposed within the second optical interface 420.

[0190] like Figure 10C As shown, the first optical fiber array includes a plurality of first multi-core optical fibers, and the second optical fiber array includes a plurality of second multi-core optical fibers.

[0191] Illustratively, the first optical fiber array includes a plurality of first multi-core optical fibers, and the direction of light transmission of some of the first multi-core optical fibers and another portion of the first single-core optical fibers is different. That is, each first multi-core optical fiber transmits light in one direction. Alternatively, each first multi-core optical fiber can transmit light in a bidirectional manner. The embodiments of the present application are not limited to this. Similarly, the second optical fiber array includes a plurality of second multi-core optical fibers, and the direction of light transmission of some of the second multi-core optical fibers and another portion of the second single-core optical fibers can be different. That is, each second multi-core optical fiber transmits light in one direction. Alternatively, each second multi-core optical fiber can transmit light in a bidirectional manner.

[0192] In some embodiments, the number of fiber cores in the first optical interface 410 is greater than or equal to the number of regions of the deflection component 210, and the number of fiber cores in the second optical interface 420 is greater than or equal to the number of regions of the deflection component 210. In other words, the number of regions of the deflection component 210 is less than or equal to the number of fiber cores in the first optical interface 410, and the number of regions of the deflection component 210 is less than or equal to the number of fiber cores in the second optical interface 420.

[0193] That is, each light beam emitted from the first optical interface 410 can be irradiated onto a different area of ​​the deflecting component 210 , and each light beam emitted from the second optical interface 420 can be irradiated onto a different area of ​​the deflecting component 210 .

[0194] The following combination Figure 8 and Figure 9 The schematic isolator 100 schematically illustrates the transmission of light in the isolator 100 provided in an embodiment of the present application.

[0195] Figure 11A and Figure 11B for Figure 8 The light transmission path of the isolator 100 is shown. Figure 11A Schematic diagram of the transmission path of light input from the first optical interface 410 and output from the second optical interface 420. Figure 11B Schematic diagram of the transmission path of light input from the second optical interface 420 and output from the first optical interface 410.

[0196] For example, Figure 11A As shown, light is input from the first optical interface 410, incident on the first spectroscopic component 110, and is transmitted to the deflection component 210 after being split by the first spectroscopic component 110. The split light is deflected in polarization direction by the deflection component 210 and the optical rotation component 220 in turn and is transmitted to the second spectroscopic component 120. After being transmitted by the second spectroscopic component 120, it is emitted and output from the second optical interface 420.

[0197] like Figure 11BAs shown, light is input from the second optical interface 420, incident on the second light splitting component 120, and is transmitted to the optical rotation component 220 after being split by the second light splitting component 120. The split light is deflected in polarization direction by the optical rotation component 220 and the deflection component 210 in sequence and is transmitted to the first light splitting component 110. After being transmitted by the first light splitting component 110, it is emitted and output from the first optical interface 410.

[0198] For ease of illustration, the light beam is illustrated as comprising a first light beam and a second light beam. The first light beam is incident on the first region 211 of the deflection member 210, and the second light beam is incident on the second region 212 of the deflection member 210. The following description uses the example of a polarization direction of the first region 211 being -45° and a polarization direction of the second region 212 being 45°.

[0199] like Figure 11A As shown, a first light beam is emitted from the first optical interface 410 and is incident on the first beam splitting component 110. The first beam splitting component 110 splits the first light beam into a first sub-beam and a second sub-beam, wherein the polarization direction of the first sub-beam is 0° and the polarization direction of the second sub-beam is 90°. The polarization direction of the first region 211 of the deflection component 210 is -45°, and the deflection direction of the optical rotation component 220 is 45°. After passing through the first region 211 of the deflection component 210, the first collimating lens 311, and the optical rotation component 220, the first and second sub-beams are collimated by the second collimating lens 321 and are incident on the second beam splitting component 120. At this time, because the polarization angles of the first and second sub-beams changed by the first region 211 of the deflection component 210 and the optical rotation component 220 are equal in magnitude but opposite in direction, they cancel each other out after passing through the second beam splitting component 120. The outgoing light beams of the first light beam are superimposed and output normally.

[0200] The second light beam exits the first optical interface 410 and enters the first beam splitting component 110. The first beam splitting component 110 splits the second light beam into a third sub-beam and a fourth sub-beam, with the third sub-beam having a polarization direction of 0° and the fourth sub-beam having a polarization direction of 90°. The second region 212 of the deflection component 210 has a polarization direction of 45°, and the optical rotation component 220 has a deflection direction of 45°. The third and fourth sub-beams pass through the first region 211 of the deflection component 210, the first collimating lens 311, and the optical rotation component 220, respectively, before being collimated by the second collimating lens 321 and entering the second beam splitting component 120. At this point, because the polarization angles of the third and fourth sub-beams altered by the second region 212 of the deflection component 210 and the optical rotation component 220 are of the same magnitude and direction, the light beams are superimposed after passing through the second beam splitting component 120, resulting in the output light of the second light beam being o-light and e-light, respectively, producing an isolation effect.

[0201] like Figure 11BAs shown, a first light beam emerges from the second optical interface 420 and enters the second beam splitting component 120. The second beam splitting component 120 splits the first light beam into a first sub-beam and a second sub-beam, wherein the polarization direction of the first sub-beam is 0° and the polarization direction of the second sub-beam is 90°. The polarization direction of the first region 211 of the deflection component 210 is -45°, and the deflection direction of the optical rotation component 220 is -45°. The first and second sub-beams pass through the second collimating lens 321, the optical rotation component 220, and the first region 211 of the deflection component 210, respectively, before being collimated by the first collimating lens 311 and entering the deflection component 210. At this time, because the polarization angles of the first and second sub-beams altered by the optical rotation component 220 and the first region 211 of the deflection component 210 are of the same magnitude and direction, the light beams are superimposed after passing through the first beam splitting component 110, resulting in the output light of the second light beam being o-light and e-light, producing an isolation effect.

[0202] The second light beam exits from the second optical interface 420 and enters the first beam splitting component 110. The second beam splitting component 120 splits the second light beam into a third sub-beam and a fourth sub-beam, with the third sub-beam having a polarization direction of 0° and the fourth sub-beam having a polarization direction of 90°. The second region 212 of the deflection component 210 has a polarization direction of 45°, and the deflection direction of the optical rotation component 220 is -45°. The first and second sub-beams pass through the second collimating lens 321, the optical rotation component 220, and the first region 211 of the deflection component 210, respectively, before being collimated by the first collimating lens 311 and entering the deflection component 210. At this point, because the polarization angles of the third and fourth sub-beams altered by the optical rotation component 220 and the second region 212 of the deflection component 210 are of equal magnitude and opposite directions, they cancel each other out after being superimposed by the first beam splitting component 110, resulting in the normal output of the first light beam.

[0203] Figure 12A and Figure 12B for Figure 9 The light transmission path of the isolator 100 is shown. Figure 12A Schematic diagram of the transmission path of light input from the first optical interface 410 and output from the second optical interface 420. Figure 12B Schematic diagram of the transmission path of light input from the second optical interface 420 and output from the first optical interface 410.

[0204] For example, Figure 12A As shown, the light transmission path and Figure 11AThe light transmission paths in FIG1 are similar. The difference is that the first beam splitting component 110 splits the first light beam into a first sub-beam and a second sub-beam, and the first sub-beam and the second sub-beam pass through the first collimating lens 311 and the first diffusion lens 312 of the first lens component 310 in sequence. The first beam splitting component 110 splits the second light beam into a third sub-beam and a fourth sub-beam, and the third sub-beam and the fourth sub-beam pass through the first collimating lens 311 and the first diffusion lens 312 of the first lens component 310 in sequence. The distance d between the third sub-beam and the second sub-beam is the smallest, and the distance d between the third sub-beam and the second sub-beam satisfies the following: d ≥ 3.5 × the beam waist radius of the third sub-beam or the second sub-beam.

[0205] like Figure 12B As shown, the light transmission path and Figure 11B The light transmission paths in FIG1 are similar. The difference is that the second beam splitting component 120 splits the first light beam into a first sub-beam and a second sub-beam, and the first sub-beam and the second sub-beam pass through the second collimating lens 321 and the second diffusion lens 322 of the second lens component 320 in sequence. The second beam splitting component 120 splits the second light beam into a third sub-beam and a fourth sub-beam, and the third sub-beam and the fourth sub-beam pass through the second collimating lens 321 and the second diffusion lens 322 of the second lens component 320 in sequence. The distance d between the third sub-beam and the second sub-beam is the smallest, and the distance d between the third sub-beam and the second sub-beam satisfies the following requirements: d ≥ 3.5 × the beam waist radius of the third sub-beam or the second sub-beam.

[0206] In this way, the distance that light emitted from different fiber cores travels in the isolator 100 can be increased, and crosstalk between light emitted from different fiber cores can be reduced.

[0207] In the isolator 100 provided in an embodiment of the present application, the deflection component 210 may include a first region 211 and a second region 212 having different polarization directions. The first light beam is incident on the first region 211 of the deflection component 210, and the second light beam is incident on the second region 212 of the deflection component 210. Different polarization directions are set according to the isolation direction to achieve isolation of different light rays in different directions.

[0208] The above is only a specific embodiment of the present application, but the scope of protection of this application is not limited to this. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. An isolator, characterized in that: include: A first light splitting component, a deflecting component, a light rotating component and a second light splitting component are sequentially arranged along the optical axis; The deflection component includes a first area and a second area, and the polarization directions of the first area and the second area are different; In the first scenario, the first spectroscopic component receives a first light beam, splits the first light beam, and directs the split light beam into the first area of ​​the deflection component; the second spectroscopic component receives a second light beam, splits the second light beam, and directs the split light beam into the second area of ​​the deflection component.

2. The isolator according to claim 1, characterized in that In the second scenario, the first spectroscopic component receives the first light beam, splits the first light beam, and directs the split light beam to the first area of ​​the deflection component; the first spectroscopic component receives the second light beam, splits the second light beam, and directs the split light beam to the second area of ​​the deflection component.

3. The isolator according to claim 1, wherein: In the third scenario, the second spectroscopic component receives the first light beam, splits the first light beam, and directs the split light beam to the first area of ​​the deflection component; the second spectroscopic component receives the second light beam, splits the second light beam, and directs the split light beam to the second area of ​​the deflection component.

4. The isolator according to any one of claims 1 to 3, characterized in that: The optical rotation component is used to receive the light output from the deflection component, and the optical rotation component is also used to receive the light output from the second light splitting component.

5. The isolator according to any one of claims 1 to 4, characterized in that: The isolator further comprises a first lens component and a second lens component; the first lens component and the second lens component are respectively arranged on two opposite sides of the optical rotation component.

6. The isolator according to claim 5, characterized in that The first lens component includes a first collimating lens and a first diffusion lens; the first collimating lens is arranged between the first light splitting component and the deflecting component, and the first diffusion lens is arranged between the first collimating lens and the deflecting component; The second lens component includes a second collimating lens and a second diffusion lens; the second collimating lens is arranged between the second light splitting component and the optical rotation component, and the second diffusion lens is arranged between the optical rotation component and the first collimating lens.

7. The isolator according to claim 5 or 6, characterized in that: The distance between the first diffusion lens and the deflecting member is equal to the focal length of the first diffusion lens.

8. The isolator according to claim 5, characterized in that The first lens component includes a first collimating lens; the first collimating lens is arranged between the deflecting component and the optical rotation component; The second lens component includes a second collimating lens; the second collimating lens is arranged between the optical rotation component and the second light splitting component.

9. The isolator according to any one of claims 1 to 8, characterized in that: The deflection component also includes a third area; the first splitting component receives a third light beam, splits the third light beam, and directs the split light beam into the third area of ​​the deflection component; the polarization direction of the third area is the same as the deflection direction of the first area or the deflection direction of the second area.

10. The isolator according to any one of claims 1 to 9, characterized in that: The material of the first light splitting component includes birefringent crystal; and / or, The material of the second light-splitting component includes birefringent crystal.

11. The isolator according to any one of claims 1 to 10, characterized in that: The deflecting component includes a half-wave plate.

12. The isolator according to any one of claims 1 to 11, characterized in that: One of the deflection angles of the first region and the second region is 45°, and the other is −45°.

13. The isolator according to any one of claims 1 to 12, characterized in that: The optical rotation component includes an optical rotation plate.

14. The isolator according to any one of claims 1 to 13, characterized in that: The deflection angle of the optical rotation component is 45°.

15. The isolator according to any one of claims 1 to 14, characterized in that: The material of the optical rotation component includes magneto-optical crystal.

16. An optical module, characterized in that: It includes a light receiving component and a light emitting component, wherein the light receiving component receives the light signal transmitted by the light emitting component; The light receiving assembly includes an isolator according to any one of claims 1 to 15; and / or, The optical transmission component includes the isolator according to any one of claims 1-15.

17. The optical module according to claim 16, wherein: The optical module further includes a first optical interface and a second optical interface; the isolator includes a first light splitting component, a deflection component, a light rotation component and a second light splitting component arranged in sequence along the optical axis; The first optical interface is located on a side of the first light splitting component away from the deflecting component, and the second optical interface is located on a side of the second light splitting component away from the optical rotation component.

18. The optical module according to claim 17, wherein: The optical module further includes a first multi-core optical fiber and a second multi-core optical fiber; the first multi-core optical fiber is arranged in the first optical interface, and the second multi-core optical fiber is arranged in the second optical interface.

19. The optical module according to claim 17, wherein: The optical module further includes a first optical fiber array and a second optical fiber array; the first optical fiber array is arranged in the first optical interface, and the second optical fiber array is arranged in the second optical interface.

20. An optical communication system, characterized in that: It comprises at least two optical communication devices and an optical fiber; the optical communication devices are connected via the optical fiber; the optical communication device comprises the optical module according to any one of claims 16 to 19.

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