Optical fiber interface, optical device, optical module, and optical communication system

Abstract

The embodiment of the invention provides an optical fiber interface, an optical device, an optical module and an optical communication system, relates to the technical field of optics, and is used for relieving the incident angle difference of different fiber cores. The optical fiber interface comprises a first fiber core group and a second fiber core group. The plurality of first fiber cores of the first fiber core group and the plurality of second fiber cores of the second fiber core group are in rotational symmetry distribution relative to a rotational symmetry point. The plurality of first fiber cores and the plurality of second fiber cores are in rotational symmetry distribution relative to the rotational symmetry point, and the midpoint of the connecting line of the first geometric center and the second geometric center is used as the rotational symmetry point. Wherein m < 1 >-n < 1 > gt; m < 2 >-n < 2 >; m1 is the maximum value of the distance between the plurality of first fiber cores and the rotational symmetry point, and n1 is the minimum value of the distance between the plurality of first fiber cores and the rotational symmetry point; after the first fiber core group and the second fiber core group rotate by the same angle along the same direction, m2 is the maximum value of the distance between the plurality of first fiber cores and the rotational symmetry point, and n2 is the minimum value of the distance between the plurality of first fiber cores and the rotational symmetry point.

Description

Technical Field

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

[0002] Light enters the optical device through its incident port, is reflected by an optical element (e.g., a beam splitter) within the device, and is output through its output port. Because the light source consists of multiple beams, the beams strike the beam splitter at different angles, resulting in light loss. Summary of the Invention

[0003] Embodiments of the present application provide an optical fiber interface, an optical device, an optical module, and an optical communication system for alleviating differences in incident angles of different fiber cores.

[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, a fiber optic interface is provided, comprising a first core group and a second core group. The first core group includes a plurality of first cores, and the first core group has a first geometric center. The second core group includes a plurality of second cores, and the second core group has a second geometric center. One of the first core group and the second core group is configured to emit light, and the other is configured to receive light. The plurality of first cores and the plurality of second cores are rotationally symmetrically distributed about a rotationally symmetric point, with the midpoint of a line connecting the first and second geometric centers serving as the rotationally symmetric point. The ratio of m2 - n2 to m1 - n1 is greater than or equal to 0.9; m1 is the maximum distance between the plurality of first cores and the rotationally symmetric point, and n1 is the minimum distance between the plurality of first cores and the rotationally symmetric point; m2 is the maximum distance between the plurality of first cores and the rotationally symmetric point when both the first core group and the second core group are rotated in the same direction by a first angle; and n2 is the minimum distance between the plurality of first cores and the rotationally symmetric point when both the first core group and the second core group are rotated in the same direction by the first angle.

[0006] In the optical fiber interface provided by the embodiment of the present application, the difference between the distance of the farthest core from the rotationally symmetric point and the distance of the closest core from the rotationally symmetric point in the first core group is less than the difference between the distance between the rotationally symmetric point and the farthest core and the distance between the rotationally symmetric point and the closest core after the first core group and the second core group are rotated by any angle. In addition, the multiple first cores included in the first core group and the multiple second cores included in the second core group are rotationally symmetric, so the distribution of the multiple second cores in the first core group is the same as the distribution of the multiple second cores in the second core group. This can reduce the difference in the incident angle of light due to the different positions of the multiple first cores included in the first core group, alleviate the decline in the consistency of the light splitting ratio and the decline in the consistency of the polarization loss.

[0007] In a possible implementation, m1, m2, n1, and n2 further satisfy: m2-n2≥m1-n1. This can further reduce the difference in light incident angle caused by different core positions.

[0008] In one possible implementation, the optical fiber interface includes a first multi-core optical fiber and a second multi-core optical fiber; the first multi-core optical fiber is provided with a first fiber core group; the second multi-core optical fiber is provided with a second fiber core group. Thus, an embodiment of the optical fiber interface is provided.

[0009] In one possible implementation, the optical fiber interface includes a first optical fiber array and a second optical fiber array; the first optical fiber array is provided with a first fiber core group, and the second optical fiber array is provided with a second fiber core group. Thus, an embodiment of the optical fiber interface is provided.

[0010] According to a second aspect of an embodiment of the present application, an optical device is provided, comprising: a first optical fiber interface, a second optical fiber interface, and a splitting component; the first optical fiber interface comprises the optical fiber interface of any one of the first aspects; the splitting component is used to split the light incident from the first fiber core group of the first optical fiber interface, and transmit part of the light to the second optical fiber interface after transmission, and reflect part of the light and transmit it to the second fiber core group of the first optical fiber interface.

[0011] The optical device provided in the second aspect of the embodiment of the present application includes the optical fiber interface of any one of the first aspects, and its beneficial effects are the same as those of the optical fiber interface, which will not be repeated here.

[0012] In one possible implementation, the optical device further includes a first deflection component disposed at the output end of the first optical fiber interface. This can reduce the distance between incident light beams from different fiber cores, further minimizing differences in light incident angles caused by different fiber core positions.

[0013] In a possible implementation, the first deflecting component includes a prism. In this way, an embodiment of an optical device is provided.

[0014] In one possible implementation, the prism includes a first side surface, a second side surface, and a third side surface; the first side surface, the second side surface, and the third side surface all extend along the long axis; the third side surface is disposed opposite the long axis; light is emitted from the first fiber core group of the first optical fiber interface, incident on the third side surface, and then transmitted to the light splitting component after exiting from the first side surface; after being split by the light splitting component, the reflected portion of the light is incident on the second side surface, exits from the third side surface, and then transmits to the second fiber core group of the first optical fiber interface. In this way, the distance between incident light rays from different fiber cores can be reduced, further reducing the difference in light incidence angle caused by different fiber core positions.

[0015] In one possible implementation, the optical device further includes a first collimating lens; the first collimating lens is disposed between the first deflecting component and the light-splitting component; the prism includes a first hypotenuse, a second hypotenuse, and a long side; the first hypotenuse is a side of the first side surface, the second hypotenuse is a side of the second side surface, and the third hypotenuse is a side of the third side surface; the first hypotenuse, the second hypotenuse, and the third hypotenuse form a first bottom surface of the prism; and the optical axis of the first collimating lens is perpendicular to the third side surface of the prism. This reduces the distance between incident light rays from different fiber cores, further reducing differences in light incidence angles caused by different fiber core positions.

[0016] In one possible implementation, the first optical fiber interface includes a first fiber core group and a second fiber core group. The line connecting the geometric centers of the first and second fiber core groups is parallel to the third side of the prism. This reduces the distance between incident light rays from different fiber cores, further minimizing differences in light incidence angles caused by different core positions.

[0017] In one possible implementation, the optical axis of the first collimating lens is coplanar with the line connecting the geometric centers of the first and second core groups. This reduces the distance between incident light rays from different cores, further minimizing differences in incident angles due to differing core positions.

[0018] In one possible implementation, the optical axis of the first collimating lens and the plane connecting the geometric centers of the first and second fiber core groups are coplanar. The first coplanar plane is perpendicular to the first, second, and third side surfaces. This reduces the distance between incident light rays from different fiber cores, further minimizing differences in incident angles due to differing core positions.

[0019] In one possible implementation, the long axis of the prism is coplanar with the optical axis of the first collimating lens. This can reduce the distance between incident light rays from different fiber cores and further reduce the difference in light incident angles caused by different fiber core positions.

[0020] In a possible implementation, at least one of the first side surface, the second side surface, and the third side surface is further coated with a filter film, thereby improving the isolation of the optical device.

[0021] In a possible implementation, the material of the filter film includes at least one of titanium pentoxide, tantalum pentoxide, or niobium pentoxide. This can improve the isolation of the optical device.

[0022] In one possible implementation, the optical device further includes a second deflection component disposed on the light-entering side of the second optical fiber interface and arranged opposite the first deflection component. This allows the reflected light path and the transmitted light path to be symmetrical, thereby improving optical path performance.

[0023] In a possible implementation, the shape of the first deflecting member is the same as the shape of the second deflecting member, so that the reflected light path and the transmitted light path can be made symmetrical, thereby improving the light path performance.

[0024] In a possible implementation, the optical device further includes a fourth port, which is disposed in the second optical fiber interface. Thus, a type of optical device is provided.

[0025] 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 receiving component comprises an optical device as described in any one of the second aspects.

[0026] The optical module provided in the third aspect of the embodiment of the present application includes the optical device of any one of the second aspects, and its beneficial effects are the same as those of the optical device, which will not be repeated here.

[0027] According to a fourth 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 optical device as described in any one of the second aspects.

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

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

[0030] The optical communication system provided in the fifth aspect of the embodiment of the present application includes the optical module of the third aspect or the fourth 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 1A A schematic diagram of the structure of an optical communication system provided in an embodiment of the present application;

[0032] Figure 1B A schematic structural diagram of another optical communication system provided in an embodiment of the present application;

[0033] Figure 2AA schematic structural diagram of an optical device for use in this application;

[0034] Figure 2B A schematic structural diagram of another optical device used in this application;

[0035] Figure 3 This is a schematic structural diagram of another optical device according to the present application;

[0036] Figure 4A This is a schematic diagram illustrating a light beam reflected by a wave splitting plate according to the present application;

[0037] Figure 4B A wavelength-loss diagram of reflected light and transmitted light for this application;

[0038] Figure 5A A schematic structural diagram of an optical device provided in an embodiment of the present application;

[0039] Figure 5B A schematic diagram of the structure of an optical fiber interface provided in an embodiment of the present application;

[0040] Figure 6A A schematic diagram of the structure of another optical fiber interface provided in an embodiment of the present application;

[0041] Figure 6B A schematic diagram of the structure of another optical fiber interface provided in an embodiment of the present application;

[0042] Figure 6C A schematic diagram of the structure of another optical fiber interface provided in an embodiment of the present application;

[0043] Figure 6D A schematic diagram of the structure of another optical fiber interface provided in an embodiment of the present application;

[0044] Figure 7 A schematic diagram of the structure of another optical fiber interface provided in an embodiment of the present application;

[0045] Figure 8 A schematic diagram of the structure of another optical fiber interface provided in an embodiment of the present application;

[0046] Figure 9A A schematic structural diagram of another optical device provided in an embodiment of the present application;

[0047] Figure 9B A schematic structural diagram of another optical device provided in an embodiment of the present application;

[0048] Figure 9C A schematic structural diagram of another optical device provided in an embodiment of the present application;

[0049] Figure 10A schematic structural diagram of another optical device provided in an embodiment of the present application;

[0050] Figure 11A A schematic structural diagram of another optical device provided in an embodiment of the present application;

[0051] Figure 11B A schematic structural diagram of another optical device provided in an embodiment of the present application;

[0052] Figure 11C A schematic structural diagram of another optical device provided in an embodiment of the present application.

[0053] Reference numerals

[0054] 1-Optical communication system; 2-Optical line terminal; 3-Optical distribution network; 4-Optical network unit; 5-Optical network terminal; 6-Wavelength division multiplexer; 10-Optical device; 11-First port; 12-Second port; 13-Third port; 14-Fourth port; 15-Arcuate slot structure; 21-First collimating lens; 22-Second collimating lens; 310 Beam splitter; 110-First optical fiber interface; 120-Second optical fiber interface; 210-First collimating lens; 220-Second collimating lens; 310-Beam splitting component; 410-First deflection component; 420-second deflection component; 101-first port; 102-second port; 103-third port; 104-fourth port; 111-first multi-core optical fiber; 112-second multi-core optical fiber; 113-third multi-core optical fiber; 121-first fiber core group; 122-second fiber core group; 131-first optical fiber array; 132-second optical fiber array; 141-cladding; 142-fiber core; 411-first hypotenuse 412-second hypotenuse; 413-long side; 401-first side; 402-second side; 403-third side. DETAILED DESCRIPTION

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] In the embodiments of this application, the descriptions of "coplanar," "parallel," and "perpendicular" represent the optimal layout solutions. However, due to actual process errors and other factors, the final results may not be completely accurate. Such inaccurate results caused by process limitations and errors are also within the scope of the embodiments of this application. The error range standard can be determined according to the following criteria.

[0061] Two lines are coplanar. One of the lines is moved parallel to the ideal coplanar position, and the moving distance does not exceed 5% of the length of the other line.

[0062] For double vertical lines, rotate one of the lines to the ideal vertical position with a rotation angle of no more than 10°.

[0063] The line and plane are parallel. Rotate the line to the ideal parallel position with a rotation angle of no more than 10°.

[0064] The line and plane are perpendicular, rotate the line to the ideal parallel position, and the rotation angle shall not exceed 10°.

[0065] To make the planes vertical, rotate one of the planes to the ideal vertical position with a rotation angle of no more than 10°.

[0066] To facilitate understanding of the technical solution, the technical terms involved in this application are explained below.

[0067] 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.

[0068] 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.

[0069] The technical solutions in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0070] The embodiment of the present application provides an optical communication system. Figure 1A As shown, the optical communication system 1 mainly includes at least two optical communication devices and optical fibers connecting the optical communication devices.

[0071] 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).

[0072] Alternatively, illustratively, 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).

[0073] In the embodiment of the present application, the optical communication system 1 may include an access network or a transmission network, which is not limited in the embodiment of the present application and may be reasonably configured according to actual conditions.

[0074] 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.

[0075] 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).

[0076] 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.

[0077] The optical communication system is a passive optical fiber network. Figure 1A 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 .

[0078] 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.

[0079] In some embodiments, as Figure 1B As shown, ONT5 and ONU4 are arranged at different positions on the user side and implement similar functions.

[0080] 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.

[0081] 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.

[0082] The optical module may be integrated into the above-mentioned ONU4 or ONT5, or may be integrated into the above-mentioned OLT2.

[0083] It is explained here that the optical communication system 1 includes but is not limited to an access network and a transmission network.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] Exemplarily, the optical emission assembly includes an electro-optical conversion chip and a photodiode (eg, 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 optical device.

[0088] 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.

[0089] 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.

[0090] Based on this, the embodiment of the present application also illustrates a wavelength division multiplexer, which can be applied to any of the above-mentioned optical communication systems, optical modules or optical components. It is explained here that the wavelength division multiplexer can be applied to, but not limited to, the above-mentioned access network or transmission network.

[0091] In some embodiments, as Figure 1B As shown, a wavelength division multiplexer is used in an optical communication system. Exemplarily, optical communication system 1 further includes a wavelength division multiplexer 6. Wavelength division multiplexer 6 can be located on the optical outgoing side of optical distribution network 3 or on the optical incoming side of optical network unit 4 or optical network terminal 5. Wavelength division multiplexer 6 is used to split an optical signal received from optical distribution network 3 into multiple optical signals and transmit them to optical network unit 4 or optical network terminal 5.

[0092] Exemplarily, a wavelength division multiplexer is used in an optical transmission component to divide an optical signal transmitted by a light source into multiple optical signals and output the multiple optical signals through an optical device.

[0093] Alternatively, for example, a wavelength division multiplexer is used in the optical receiving component to combine multiple received optical signals into one optical signal, and then convert the optical signal into an electrical signal for further processing.

[0094] In some embodiments, the optical component further includes a wavelength division multiplexer, wherein the wavelength division multiplexer can demultiplex an optical signal or combine multiple optical signals.

[0095] Based on this, an embodiment of the present application illustrates an optical device, which may be, for example, the wavelength division multiplexer mentioned above.

[0096] In some embodiments, a three-port optical device is shown. Figure 2A As shown, the optical device 10 includes a first port 11 , a second port 12 , a third port 13 , a first collimating lens 21 , a second collimating lens 22 and a beam splitter 31 .

[0097] For example, light is input from the first port 11, incident on the first collimating lens 21, collimated by the first collimating lens 21, and then incident on the beam splitter 31. Part of the light is transmitted through the beam splitter 31, and part of the light is reflected by the beam splitter 31. The part of the light reflected by the beam splitter 31 is output from the second port 12, and the part of the light transmitted by the beam splitter 31 is output from the third port 13.

[0098] It is explained here that the first port 11 is the incident end of the optical device 10 , the second port 12 is the reflective end of the optical device 10 , and the third port 13 is the transmissive end of the optical device 10 .

[0099] In other embodiments, a four-port (eg, 2×2 optical splitter) optical device is shown. Figure 2B As shown, the optical device 10

[0100] A first port 11 , a second port 12 , a third port 13 , a fourth port 14 , a first collimating lens 21 , a second collimating lens 22 and a beam splitter 31 .

[0101] Figure 2B Schematic diagram of light transmission and Figure 2A The light transmission of the illustrated optical devices is similar, and for details, please refer to the above description of light transmission.

[0102] Exemplarily, the first port 11 serves as the incident end of the optical device 10 , the second port 12 serves as the reflective end of the optical device 10 , and the third port 13 serves as the transmissive end of the optical device 10 .

[0103] The second port 12 serves as the incident end of the optical device 10 , the first port 11 serves as the reflective end of the optical device 10 , and the third port 13 serves as the transmissive end of the optical device 10 .

[0104] The fourth port 14 serves as the incident end of the optical device 10 , the third port 13 serves as the reflective end of the optical device 10 , and the first port 11 serves as the transmissive end of the optical device 10 .

[0105] In some embodiments, the optical device 10 can transmit multiple beams of light. In other words, each of the ports is provided with multiple fiber cores for transmitting light.

[0106] like Figure 3 1 shows an optical device including multiple fiber cores. The optical device 10 includes a first port 11, a second port 12, a third port 13, and a beam splitter 31. The first port 11 and the second port 12 are packaged in the same interface.

[0107] Figure 3 The illustrated optical device is the three-port optical device described above. Light incident from the first port 11 is split by a beam splitter 31. Part of the light is transmitted through the beam splitter 31 and then transmitted to the third port 13, where it is output. Part of the light is reflected by the beam splitter 31 and then transmitted to the second port 12, where it is output.

[0108] In order to improve the integration of the optical device 10 and thus improve the efficiency of light application, Figure 3 As shown, an arcuate groove structure 15 is formed at the interface of the first port 11 and the second port 12 and the interface end face of the third port 13. However, the consistency problem between the multi-core optical fibers mentioned above is not mentioned.

[0109] However, since the wavelengths of the light transmitted in the multiple fiber cores in each port are different and the bandwidths of the light splitting on the beam splitter 31 are also different, the light signal flows of different fiber cores are different.

[0110] Take four fiber cores as an example, Figure 4A As shown, light is emitted from the four fiber cores of the first port 11 , reflected by the beam splitter 31 , and then incident on the four fiber cores of the second port 12 .

[0111] like Figure 4A As shown, due to the different spatial positions of the four fiber cores of the first port 11 , the incident angles of the light output from different fiber cores onto the beam splitter 31 are different.

[0112] Due to the surface coating of the beam splitter and the influence of the coating process, the different incident angles of light cause the measurement curve to drift, which in turn causes large spectral differences (such as Figure 4B As shown in Figure 2, the uniformity of the splitting ratio of the light and the uniformity of the polarization loss are decreased.

[0113] In order to alleviate the problems of decreased consistency in light splitting ratio and polarization loss, higher coating process requirements and design parameters are required for the beam splitter 31 so that it can be compatible with deviations and performance degradation caused by different light incident angles.

[0114] However, in order to make the beam splitter 31 meet the above requirements, the preparation cost and process difficulty of the beam splitter will increase.

[0115] Based on this, in order to reduce the preparation cost of the beam splitter and alleviate the problem of decreased consistency of the splitting ratio and polarization loss, the embodiment of the present application also provides an optical device. Figure 5A As shown, the optical device 10 includes a first optical fiber interface 110 , a second optical fiber interface 120 , a first collimating lens 210 , a second collimating lens 220 and a light splitting component 310 .

[0116] The first optical fiber interface 110 includes a first port 101 and a second port 102. That is, the first port 101 and the second port 102 are packaged together to form the first optical fiber interface 110.

[0117] Illustratively, the second fiber optic interface 120 includes a third port 103 .

[0118] Exemplarily, light is input from the first port 101 of the first optical fiber interface 110, incident on the first collimating lens 210, collimated by the first collimating lens 210, and then incident on the light splitting component 310. Part of the light is transmitted by the light splitting component 310, and part of the light is reflected by the light splitting component 310. The part of the light reflected by the light splitting component 310 is output from the second port 102 of the first optical fiber interface 110, and the part of the light transmitted by the light splitting component 310 is output from the second optical fiber interface 120.

[0119] That is, the first port 101 of the first optical fiber interface 110 is the incident port of the optical device 10 , the second port 102 of the first optical fiber interface 110 is the reflection port of the optical device 10 , and the second optical fiber interface 120 is the transmission port of the optical device 10 .

[0120] The optical device 10 shown in the embodiment of the present application can transmit multiple beams of light, so multiple fiber cores are provided in the first port 101 of the first fiber interface 110, the second port 102 of the first fiber interface 110, and the second fiber interface 120. The fiber cores are used to transmit light.

[0121] In the embodiment of this application, Figure 5B As shown, a first fiber core group 121 is disposed in the first port 101, and a second fiber core group 122 is disposed in the second port 102. It is explained here that a third fiber core group is disposed in the second optical fiber interface 120.

[0122] For example, Figure 5B As shown, the first core group 121 includes a plurality of first cores, and the second core group 122 includes a plurality of second cores.

[0123] Likewise, the third core group includes a plurality of third cores.

[0124] The number of cores included in the first core group 121, the number of cores included in the second core group 122, and the number of cores included in the third core group can be the same. Alternatively, they can be different. This embodiment of the present application does not limit this, and can be reasonably set according to actual conditions.

[0125] Exemplarily, the number of fiber cores in the first optical fiber interface 110 is twice the number of fiber cores in the second optical fiber interface 120 .

[0126] The first fiber core group 121 and the second fiber core group 122 are both disposed in the first optical fiber interface 110 .

[0127] For example, Figure 5B As shown, the first optical fiber interface 110 further includes a cladding 141. The cladding 141 wraps around the periphery of the first fiber core group 121. It is explained here that the cladding 141 also wraps around the periphery of the second fiber core group 122.

[0128] In the embodiment of the present application, the shape of the cladding 141 is not limited and can be reasonably set according to actual conditions. For example, the cladding 141 can be a regular shape such as a cylinder or a prism. Alternatively, it can be an irregular shape.

[0129] Regarding the arrangement of multiple fiber cores, in some embodiments, such as Figure 6A As shown, the first optical fiber interface 110 may include a first multi-core optical fiber 111 and a second multi-core optical fiber 112. A first fiber core group 121 is disposed within the first multi-core optical fiber 111, and a second fiber core group 122 is disposed within the second multi-core optical fiber 112. In other words, the first fiber core group 121 is disposed within the first multi-core optical fiber 111, and the second fiber core group 122 is disposed within the second multi-core optical fiber 112.

[0130] like Figure 6A 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 6A As shown, the multi-core optical fiber includes a cladding 141 and a plurality of cores 142 disposed in the cladding 141. 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.

[0131] Exemplarily, the multiple cores included in the first multi-core optical fiber 111 can realize unidirectional transmission of light, and the multiple cores included in the second multi-core optical fiber 112 can realize unidirectional transmission of light, and the direction of light transmitted by the cores included in the first multi-core optical fiber 111 is opposite to the direction of light transmitted by the cores included in the second multi-core optical fiber 112.

[0132] Alternatively, illustratively, the first optical fiber interface 110 may include a third multi-core optical fiber 113 . The first fiber core group 121 and the second fiber core group 122 are both disposed in the third multi-core optical fiber 113 .

[0133] The third multi-core optical fiber 113 includes multiple cores that can realize bidirectional transmission of light. Figure 6B As shown, the light transmission directions of the multiple first fiber cores included in the first fiber core group 121 are the same, the light transmission directions of the multiple second fiber cores included in the second fiber core group 122 are the same, and the light transmission directions of the multiple first fiber cores included in the first fiber core group 121 are different from the light transmission directions of the multiple second fiber cores included in the second fiber core group 122.

[0134] It is explained here that the directions of the light transmission of the multiple first fiber cores included in the first fiber core group 121 are the same, the directions of the light transmission of the multiple second fiber cores included in the second fiber core group 122 are the same, and the directions of the light transmission of the multiple first fiber cores included in the first fiber core group 121 are different from the directions of the light transmission of the multiple second fiber cores included in the second fiber core group 122.

[0135] It is explained here that the multi-core optical fiber disposed in the optical device 10 (eg, a wavelength division multiplexer) can increase the fiber density and the integration level of the optical communication system, optical module, or optical component.

[0136] In other embodiments, Figure 6C As shown, the first fiber optic interface 110 may include a first fiber optic array 131 and a second fiber optic array 132 .

[0137] As an example, a single-core optical fiber array is shown, which includes multiple single-core optical fibers. A single-core optical fiber is an optical fiber with a single core disposed within a cladding.

[0138] like Figure 6C As shown, the single-core optical fiber includes a cladding 141 and a core 142 disposed in the cladding 141. 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.

[0139] The first optical fiber interface 110 includes a first single-core optical fiber array and a second single-core optical fiber array. Each single-core optical fiber in the first single-core optical fiber array has a first core, and each single-core optical fiber in the second single-core optical fiber array has a second core.

[0140] That is, the first optical fiber array 131 includes a plurality of first single-core optical fibers, and the second optical fiber array 132 includes a plurality of second single-core optical fibers. Exemplarily, the number of the first single-core optical fibers is the same as the number of the second single-core optical fibers.

[0141] One core of the first fiber core group 121 is disposed in a first single-core optical fiber, and one core of the second fiber core group 122 is disposed in a second single-core optical fiber.

[0142] That is, the first fiber core group 121 includes a plurality of first fiber cores respectively disposed in a plurality of first single-core optical fibers, and the second fiber core group 122 includes a plurality of second fiber cores respectively disposed in a plurality of second single-core optical fibers.

[0143] It is explained here that the first optical fiber array 131 transmits light in the same direction as the second optical fiber array 132 , and the first optical fiber array 131 transmits light in a direction different from the second optical fiber array 132 .

[0144] Or, for example, Figure 6D , which illustrates a multi-core optical fiber array, that is, the optical fiber array includes multiple multi-core optical fibers.

[0145] The first optical fiber interface 110 includes a first multi-core optical fiber array and a second multi-core optical fiber array. Each multi-core optical fiber of the first multi-core optical fiber array has multiple first cores, and each multi-core optical fiber of the second multi-core optical fiber array has multiple second cores.

[0146] That is, the first fiber array 131 includes multiple first multi-core optical fibers 111, and the second fiber array 132 includes multiple second multi-core optical fibers 112. The multiple first fiber cores are respectively disposed in the multiple first multi-core optical fibers 111, and the multiple second fiber cores are respectively disposed in the multiple second multi-core optical fibers 112.

[0147] That is, the first cores included in the first core group 121 are respectively disposed in the first multi-core optical fibers 111 , and the second cores included in the second core group 122 are respectively disposed in the second multi-core optical fibers 112 .

[0148] It should be noted that the arrangement direction of the first fiber core group 121 and the second fiber core group 122 is not limited in the embodiments of the present application and can be appropriately set according to actual conditions. For example, the first fiber core group 121 and the second fiber core group 122 can be arranged along a first direction. Alternatively, the first fiber core group 121 and the second fiber core group 122 can be arranged along a second direction. The first direction and the second direction intersect. For example, the first direction is a vertical direction, and the second direction is a horizontal direction.

[0149] For the convenience of illustration, the following description is made by assuming that the first core group 121 is disposed in a first multi-core optical fiber 111 and the second core group 122 is disposed in a second multi-core optical fiber 112 .

[0150] In some embodiments, as Figure 7 As shown, the light emitted from the fiber core 121a in the first fiber core group 121 is reflected by the splitter component 310 and then incident on the fiber core 122a in the second fiber core group 122; the light emitted from the fiber core 121b in the first fiber core group 121 is reflected by the splitter component 310 and then incident on the fiber core 122b in the second fiber core group 122; the light emitted from the fiber core 121ca in the first fiber core group 121 is reflected by the splitter component 310 and then incident on the fiber core 122c in the second fiber core group 122; and the light emitted from the fiber core 121d in the first fiber core group 121 is reflected by the splitter component 310 and then incident on the fiber core 122d in the second fiber core group 122.

[0151] In the embodiment of the present application, the first core group 121 and the second core group 122 are rotationally symmetrically distributed relative to the rotational symmetry point. In other words, the multiple first cores of the first core group 121 and the multiple second cores of the second core group 122 are rotationally symmetrically distributed relative to the rotational symmetry point.

[0152] For example, Figure 7As shown, the first fiber core group 121 has a first geometric center A, and the second fiber core group 122 has a second geometric center B. The midpoint of the line connecting the first geometric center A and the second geometric center B serves as the rotational symmetry point C.

[0153] It is explained here that in one case, the cladding 141 wrapping the first fiber core group 121 includes a symmetrical shape such as a circle or a cylinder, and the first fiber core group 121 is arranged in the middle position of the cladding 141, and the first geometric center A of the first fiber core group 121 coincides with the center of the first multi-core optical fiber.

[0154] For example, Figure 7 As shown, m1 is the maximum value of the distances between the multiple first fiber cores and the rotationally symmetric point C. For example, the distance between the fiber core 121a and the rotationally symmetric point C is the maximum value m1 of the distances between the multiple first fiber cores included in the first fiber core group and the rotationally symmetric point C. n1 is the minimum value of the distances between the multiple first fiber cores and the rotationally symmetric point C. For example, the distance between the fiber core 121b and the rotationally symmetric point C is the minimum value n1 of the distances between the multiple first fiber cores included in the first fiber core group and the rotationally symmetric point C.

[0155] For example, Figure 8 As shown, the first core group 121 and the second core group 122 are rotated in the same direction and by the same angle. Exemplarily, m2 is the maximum value of the distances between the first cores and the rotationally symmetric point when the first core group and the second core group are rotated in the same direction by the first angle. For example, the distance between core 121c and the rotationally symmetric point C is the maximum value m2 of the distances between the first cores included in the first core group 121 and the rotationally symmetric point C. n2 is the minimum value of the distances between the first cores and the rotationally symmetric point when the first core group and the second core group are rotated in the same direction by the first angle. For example, the distance between core 121d and the rotationally symmetric point C is the minimum value n2 of the distances between the second cores included in the first core group 121 and the rotationally symmetric point C.

[0156] Among them, m1, m2, n1 and n2 satisfy: the ratio of m2-n2 to m1-n1 is greater than or equal to 0.9.

[0157] It is understood that the rotation direction may include clockwise rotation or counterclockwise rotation, which is not limited in the present embodiment, as long as the first fiber core group 121 and the second fiber core group 122 rotate in the same direction. The first angle may be any angle, for example, the first angle ranges from 0° to 360°.

[0158] That is, m2 and n2 are the maximum value of the distance between the first fiber cores and the rotationally symmetric point C after the first fiber core group 121 and the second fiber core group 122 are rotated in the same direction by any angle, and n2 is the minimum value of the distance between the first fiber cores and the rotationally symmetric point C.

[0159] In the embodiment of the present application, the distance can be selected from the distance between the center of the fiber core and the rotational symmetry point C. Alternatively, the edge of the fiber core can be selected. The embodiment of the present application does not limit this, and it is sufficient that the position selected for each fiber core is the same.

[0160] It is explained here that the multiple first cores included in the first fiber core group 121 and the multiple second cores included in the second fiber core group 122 are rotationally symmetric. Therefore, the distribution of the multiple first cores of the first fiber core group 121 is the same as the distribution of the multiple second cores of the second fiber core group 122. For details, please refer to the above description of the first fiber core group, which will not be repeated here.

[0161] In this way, the difference between the distance of the farthest fiber core from the rotationally symmetric point C and the distance of the closest fiber core to the rotationally symmetric point C in the first fiber core group 121 is smaller than the difference between the distance between the rotationally symmetric point C and the farthest fiber core and the distance between the rotationally symmetric point C and the closest fiber core after the first fiber core group 121 and the second fiber core group 122 are rotated by any angle. This can reduce the distance between any optical fiber and the rotationally symmetric point C, and further reduce the difference in the incident angle of light caused by the different positions of the multiple first fiber cores included in the first fiber core group 121.

[0162] Depend on Figure 7 and Figure 8 It can be seen that Figure 7 The arrangement distance difference between the multiple first cores of the first core group 121 and the multiple second cores of the second core group 122 is greater, and the incident angle difference after incident on the light splitting component 310 is greater, and Figure 8 The arrangement distance difference between the multiple first cores of the first core group 121 and the multiple second cores of the second core group 122 is smaller, so that the difference in the incident angle after incident on the light splitting component 310 is reduced, so Figure 7 The illustrated fiber core distribution can effectively reduce the difference in incident angles, alleviate the decrease in the consistency of the light splitting ratio and the decrease in the consistency of polarization loss.

[0163] In some embodiments, the above m1, m2, n1 and n2 also satisfy: m2-n2≥m1-n1.

[0164] In this way, the difference in light incident angle caused by different core positions can be further reduced.

[0165] The embodiment of the present application does not limit whether the first fiber core group 121 and the second fiber core group 122 are set in a multi-core optical fiber or a single-core optical fiber. It can be set according to actual conditions, and it is only necessary to ensure that the distribution of the multiple first fiber cores of the first fiber core group 121 and the distribution of the multiple second fiber cores of the second fiber core group 122 meet rotational symmetry.

[0166] Regarding the light splitting component 310, continue to refer to Figure 5A The light splitting component 310 is used to partially refract and partially transmit the light incident on its surface.

[0167] In some embodiments, the light splitting component 310 may include a light splitter or a wavelength splitter.

[0168] Exemplarily, the light splitting component 310 may include a beam splitter. In this case, the light splitting component 310 may split the light according to a preset splitting ratio. For example, the light splitting component 310 may transmit a portion of the light and reflect another portion of the light according to the preset splitting ratio.

[0169] Alternatively, the light-splitting component 310 may include a wavelength splitting plate. In this case, the light-splitting component 310 may split the light according to a preset wavelength range. For example, the light-splitting component 310 allows a portion of light with a wavelength within the preset range to pass through, while simultaneously reflecting light that does not fall within the preset range. This embodiment of the present application does not limit this, and may be appropriately configured based on actual circumstances.

[0170] In some embodiments, as Figure 9A As shown, the optical device 10 further includes a first deflecting component 410 .

[0171] like Figure 9A As shown, the first deflection component 410 is disposed between the first optical fiber interface 110 and the first collimating lens 210. In other words, the first deflection component 410 is disposed on the light-emitting side of the first port 101. In other words, the first deflection component 410 is disposed on the light-incident side of the second port 102.

[0172] For example, the first deflecting component 410 may include a triangular prism, for example, a regular triangular prism with an isosceles triangle as its base.

[0173] like Figure 9B As shown, the prism includes a first side surface 401, a second side surface 402, and a third side surface 403. The angle between the first side surface 401 and the second side surface 402 is the vertex angle of the prism, and the third side surface 403 of the prism is disposed opposite the vertex angle of the prism. The first side surface 401, the second side surface 402, and the third side surface 403 all extend along the long axis, and the third side surface 403 is disposed opposite the long axis.

[0174] Continue to refer Figure 9B The triangular prism includes a first hypotenuse 411 , a second hypotenuse 412 , and a long side 413 adjacent to both the first hypotenuse 411 and the second hypotenuse 412 .

[0175] The first hypotenuse 411 is a side of the first side 401, the second hypotenuse 412 is a side of the second side 402, and the long side 413 is a side of the third side 403. The first hypotenuse 411, the second hypotenuse 412, and the long side 413 form the first base of the prism. The first base is perpendicular to the first side 401, the second side 402, and the third side 403.

[0176] like Figure 9B As shown, light is emitted from the first fiber core group 121 of the first optical fiber interface 110, enters the third side surface 403 of the prism, exits through the first side surface 401 of the prism, and is transmitted to the light splitting component 310. After being split by the light splitting component 310, the reflected portion of the light is incident from the second side surface 402 of the prism, exits through the third side surface 403 of the prism, and is transmitted to the second fiber core group 122 of the first optical fiber interface 110.

[0177] That is, the first side surface 401 of the prism serves as a light incident surface, the second side surface 402 of the prism serves as a light emitting surface, and the third side surface 403 of the prism serves as both a light incident surface and a light emitting surface.

[0178] Illustratively, the third side surface 403 of the prism intersects the optical axis of the first collimating lens 210 .

[0179] Exemplarily, the angle between the third side surface 403 of the prism and the optical axis of the first collimating lens 210 is 80° to 100°. For example, the angle may be 80°, 87°, 90°, 95°, or 100°. The third side surface 403 of the prism and the optical axis of the first collimating lens 210 may intersect perpendicularly.

[0180] Illustratively, the angle between the third side surface 403 of the triangular prism and the line connecting the geometric centers of the first fiber core group 121 and the second fiber core group 122 is between -10° and 10°. For example, the angle may be -10°, -5°, 0°, 6°, or 10°. The third side surface 403 of the triangular prism is parallel to the line connecting the geometric centers of the first fiber core group 121 and the second fiber core group 122.

[0181] It should be noted that the embodiments of the present application do not limit the type of fiber cores provided within the first fiber interface 110. For example, a multi-core fiber, a single-core fiber, or a fiber array may be provided within the first fiber interface 110. For different fiber core types, the method for selecting the connecting line between the geometric centers of the first fiber core group 121 and the second fiber core group 122 is the same, and is related to the layout of the first fiber core group 121 and the second fiber core group 122, and is unrelated to the cladding surrounding the first fiber core group 121 or the second fiber core group 122.

[0182] The embodiment of the present application does not limit the placement position of the prism, as long as the prism, the first collimating lens 210 and the first optical fiber interface 110 meet the above relationship.

[0183] In some embodiments, as Figure 9B As shown, the optical axis of the first collimating lens 210 is coplanar with the line connecting the geometric centers of the first fiber core group 121 and the second fiber core group 122, and this plane is perpendicular to the first side surface 401, the second side surface 402, and the third side surface 403 of the prism. In other words, the optical axis of the first collimating lens 210 and the plane connecting the geometric centers of the first fiber core group 121 and the second fiber core group 122 are coplanar, and this coplanar plane is perpendicular to the first side surface 401, the second side surface 402, and the third side surface 403 of the prism.

[0184] Exemplarily, the prism extends along a long axis, the long axis of the prism is coplanar with the optical axis of the first collimating lens 210 , and the long axis of the prism is perpendicular to the optical axis of the first collimating lens 210 .

[0185] It should be noted that the descriptions of "coplanar," "parallel," and "perpendicular" in the embodiments of this application represent optimal layout solutions. However, due to actual process errors and other factors, the final results may not be completely accurate. Such inaccurate results caused by process limitations and errors are also within the scope of the embodiments of this application. The error range standard can be determined according to the following criteria.

[0186] In some embodiments, as Figure 9C As shown, the angle between the first side surface 401 and the third side surface 403 of the prism is θ, and the angle between the second side surface 402 and the third side surface 403 of the prism is θ. In other words, the angle between the first hypotenuse 411 and the long side 413 of the prism is θ, and the angle between the second hypotenuse 412 and the long side 413 of the prism is θ. In other words, the vertex angle of the prism is 180°-2θ.

[0187] Exemplarily, the light is emitted from the first optical fiber interface 110 and then transmitted to the prism. It is incident from the third side surface of the prism and then emitted from the second side surface of the prism. The deflection angle of the light is φ.

[0188] Taking the incidence of the first light beam a1 and the second light beam a2 on a triangular prism as an example, the distance between the first light beam and the second light beam before they are incident on the triangular prism (the distance between a1 and a2) is d0, and the distance between them after passing through the triangular prism (the distance between b1 and b2) is d1. d1 and d0 satisfy d1 = d0×(1 - tan(θ)×tan(φ)).

[0189] It can be seen that d1 < d0. Therefore, after the first light beam a1 and the second light beam a2 are transmitted through the triangular prism, the distance between them decreases.

[0190] In this way, by adding a deflection component 410 on the light output side, the distance between the light beams emitted from the multiple first cores of the first core group 121 can be reduced, further reducing the difference in the incident angles of the light beams emitted from the multiple first cores when they are incident on the beam splitting component 310, and thus reducing the frequency drift.

[0191] In some embodiments, at least one side surface of the first deflection component 410 is further provided with a filter film. That is to say, a filter film is provided on the surface of at least one of the first side surface 401, the second side surface 402, and the third side surface 403.

[0192] It should be clarified here that a filter film can be provided on each side surface of the first deflection component 410. Or a filter film can be provided on one side surface of the first deflection component 410. Or, filter films can be provided on any two side surfaces of the first deflection component 410. The embodiments of the present application do not limit this, and it can be reasonably set according to the actual situation.

[0193] Exemplarily, the material of the filter film can include compound materials such as titanium trioxide (Ti3O5), tantalum pentoxide (Ta2O5), or niobium pentoxide (Nb2O5), etc. The embodiments of the present application do not limit this, and it can be reasonably set according to the actual situation.

[0194] In this way, light of a specific wavelength band can be made to pass through, and light of other wavelength bands can be filtered out, further improving the isolation degree and compensating for the isolation degree of the light.

[0195] In some other embodiments, as Figure 10 shown, the optical device 又 includes a second deflection component 420. Among them, the second deflection component 420 is provided on the light incident side of the second optical fiber interface 120.

[0196] As Figure 10 shown, the second deflection component 420 is disposed opposite to the first deflection component 410.

[0197] Exemplarily, the second deflection component 420 can include a triangular prism. For example, the triangular prism can be a regular triangular prism with an isosceles triangle as the base.

[0198] That is, the top angle of the first deflecting member 410 is opposite to the top angle of the second deflecting member 420. In other words, the long axis of the first deflecting member 410 is opposite to the long axis of the second deflecting member 420.

[0199] Illustratively, the shape of the first deflecting member 410 is the same as the shape of the second deflecting member 420. In other words, the angle and size of the first deflecting member 410 are the same as the angle and size of the second deflecting member 420.

[0200] In this way, the optical path can be compensated by the second deflecting component 420 to improve the optical path performance.

[0201] In some embodiments, as Figure 11A As shown, the optical device 10 further includes a fourth port 104 .

[0202] That is, the optical device 10 can be used as a four-port optical device.

[0203] It is explained here that the fourth port 104 can be disposed in the second optical fiber interface 120. That is, the second optical fiber interface 120 includes the third port 103 and the fourth port 104.

[0204] In this case, the distribution of the multiple fiber cores in the second optical fiber interface 120 may be the same as the distribution of the multiple fiber cores in the first optical fiber interface 110. For details, please refer to the above description of the first optical fiber interface 110, which will not be repeated here.

[0205] Alternatively, the fourth port 104 may be provided independently of the third port 103. This embodiment of the present application does not limit this.

[0206] like Figure 11B As shown, for a four-port optical device, the first deflection component 410 is disposed between the first optical fiber interface 110 and the first collimating lens 210 , and the second deflection component 420 is disposed between the second collimating lens 220 and the second optical fiber interface 120 .

[0207] In the optical fiber interface (first optical fiber interface 110) provided in the embodiment of the present application, the difference between the distance of the farthest core from the rotationally symmetrical point in the first core group 121 and the distance of the closest core from the rotationally symmetrical point is less than the difference between the distance between the rotationally symmetrical point and the farthest core and the distance between the rotationally symmetrical point and the closest core after the first core group 121 and the second core group 122 are rotated by any angle. In addition, the multiple first cores included in the first core group 121 and the multiple second cores included in the second core group 122 are rotationally symmetrical, so the distribution of the multiple first cores of the first core group 121 is the same as the distribution of the multiple second cores of the second core group 122. In this way, the difference in the incident angle of light caused by the different positions of the multiple first cores included in the first core group 121 can be reduced, and the decrease in the consistency of the light splitting ratio and the decrease in the consistency of the polarization loss can be alleviated.

[0208] The optical fiber interface provided in the embodiment of the present application is applied to the optical device 10 as the first optical fiber interface 110 , and its beneficial effects are the same as those of the first optical fiber interface 110 , which will not be repeated here.

[0209] 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 optical fiber interface, characterized in that: include: A first fiber core group includes a plurality of first fiber cores; the first fiber core group has a first geometric center; a second fiber core group including a plurality of second fiber cores; the second fiber core group having a second geometric center; one of the first fiber core group and the second fiber core group is used for emitting light, and the other is used for receiving light; The plurality of first fiber cores and the plurality of second fiber cores are distributed rotationally symmetrically with respect to a rotationally symmetrical point; the midpoint of a line connecting the first geometric center and the second geometric center serves as the rotationally symmetrical point; Among them, the ratio of m2-n2 to m1-n1 is greater than or equal to 0.9; m1 is the maximum value of the distance between the multiple first fiber cores and the rotationally symmetric point, and n1 is the minimum value of the distance between the multiple first fiber cores and the rotationally symmetric point; m2 is the maximum value of the distance between the multiple first fiber cores and the rotationally symmetric point when the first fiber core group and the second fiber core group are both rotated in the same direction by the first angle, and n2 is the minimum value of the distance between the multiple first fiber cores and the rotationally symmetric point when the first fiber core group and the second fiber core group are both rotated in the same direction by the first angle.

2. The optical fiber interface according to claim 1, wherein: m1, m2, n1 and n2 also satisfy: m2-n2≥m1-n1.

3. The optical fiber interface according to claim 1 or 2, characterized in that: The optical fiber interface includes a first multi-core optical fiber and a second multi-core optical fiber; the first multi-core optical fiber is provided with the first fiber core group; the second multi-core optical fiber is provided with the second fiber core group.

4. The optical fiber interface according to claim 1 or 2, characterized in that: The optical fiber interface includes a first optical fiber array and a second optical fiber array; the first optical fiber array is provided with the first fiber core group, and the second optical fiber array is provided with the second fiber core group.

5. An optical device, characterized in that: include: A first optical fiber interface, a second optical fiber interface, and a light splitting component; the first optical fiber interface comprises the optical fiber interface according to any one of claims 1 to 5; The light splitting component is used to split the light incident from the first fiber core group of the first fiber interface, and transmit part of the light to the second fiber interface after transmission, and reflect part of the light to the second fiber core group of the first fiber interface after transmission.

6. The optical device according to claim 5, characterized in that The optical device further includes a first deflecting component; the first deflecting component is arranged at the output end of the first optical fiber interface.

7. The optical device according to claim 6, wherein: The first deflecting component includes a prism.

8. The optical device according to claim 7, wherein: The prism includes a first side surface, a second side surface, and a third side surface; the first side surface, the second side surface, and the third side surface all extend along the long axis of the prism; and the third side surface is arranged opposite to the long axis; The light is emitted from the first fiber core group of the first optical fiber interface, incident on the third side, and is transmitted to the splitting component after being emitted from the first side; after being split by the splitting component, the reflected part of the light is incident from the second side, and is transmitted to the second fiber core group of the first optical fiber interface after being emitted from the third side.

9. The optical device according to claim 8, characterized in that The optical device further includes a first collimating lens; the first collimating lens is arranged between the first deflecting component and the light splitting component; The triangular prism includes a first hypotenuse, a second hypotenuse, and a long side; the first hypotenuse is a side of the first side surface, the second hypotenuse is a side of the second side surface, and the long side is a side of the third side surface; the first hypotenuse, the second hypotenuse, and the long side form a first bottom surface of the triangular prism; An optical axis of the first collimating lens is perpendicular to the third side surface of the prism.

10. The optical device according to claim 9, characterized in that The first optical fiber interface includes a first fiber core group and a second fiber core group; a line connecting the geometric centers of the first fiber core group and the second fiber core group is parallel to the third side surface of the prism.

11. The optical device according to claim 9 or 10, characterized in that: The optical axis of the first collimating lens is coplanar with a line connecting a geometric center of the first fiber core group and a geometric center of the second fiber core group.

12. The optical device according to any one of claims 9 to 11, characterized in that: The plane where the optical axis of the first collimating lens and the line connecting the geometric centers of the first fiber core group and the second fiber core group lie is a first coplanar plane; the first coplanar plane is perpendicular to the first side surface, the second side surface and the third side surface.

13. The optical device according to any one of claims 9 to 12, characterized in that: The major axis of the prism is coplanar with the optical axis of the first collimating lens.

14. The optical device according to any one of claims 6 to 13, characterized in that: A filter film is also coated on a surface of at least one of the first side surface, the second side surface, and the third side surface.

15. The optical device according to claim 14, wherein: The material of the filter film includes at least one of titanium pentoxide, tantalum pentoxide or niobium pentoxide.

16. The optical device according to any one of claims 6 to 15, characterized in that: The optical device further includes a second deflecting component; the second deflecting component is arranged on the light incident side of the second optical fiber interface; the second deflecting component is arranged opposite to the first deflecting component.

17. The optical device according to claim 16, wherein: The shape of the first deflecting member is the same as that of the second deflecting member.

18. The optical device according to any one of claims 5 to 17, characterized in that: The optical device further includes a fourth port; the fourth port is arranged in the second optical fiber interface.

19. 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 comprises an optical device according to any one of claims 5 to 18; and / or, The optical transmission assembly includes the optical device according to any one of claims 5-18.

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 claim 19.

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