Single fiber bidirectional optical module and optical communication system

Abstract

The application discloses a single-fiber bidirectional optical module and an optical communication system. The single-fiber bidirectional optical module comprises an optical transmitting assembly, an optical fiber assembly, an optical receiving assembly and a wavelength division multiplexing assembly. The optical transmitting assembly is used for transmitting a first light beam and a second light beam. The optical fiber assembly is used for receiving the first light beam and the second light beam and transmitting a third light beam and a fourth light beam. The optical receiving assembly is used for receiving the third light beam and the fourth light beam. The wavelength division multiplexing assembly is arranged on the optical path between the optical transmitting assembly and the optical fiber assembly and on the optical path between the optical fiber assembly and the optical receiving assembly. The wavelength division multiplexing assembly is configured to receive the first light beam and the second light beam, transmit the first light beam and the second light beam to the optical fiber assembly after internal transmission of the wavelength division multiplexing assembly, receive the third light beam and the fourth light beam, and transmit the third light beam and the fourth light beam to the optical receiving assembly after internal transmission of the wavelength division multiplexing assembly. The wavelengths of the first light beam, the second light beam, the third light beam and the fourth light beam are different from each other.

Description

Technical Field

[0001] This invention relates to the field of optical communication technology, and in particular to single-fiber bidirectional optical modules and optical communication systems. Background Technology

[0002] As optical transmission technology advances towards higher transmission rates such as 800G and 1.6T, fiber optic resources are encountering bottlenecks. Furthermore, the demand for higher transmission rates and more fiber channels brings about power consumption and heat dissipation issues, requiring further solutions. In existing technologies, wavelength division multiplexing (WDM) technology enables bidirectional transmission across a single fiber in optical modules, significantly saving fiber optic resources, reducing fiber deployment costs, and increasing cabling density.

[0003] However, in existing single-fiber bidirectional optical modules, each fiber has only one wavelength for input and output. When the laser rate is limited, the optical module cannot meet the requirements for high transmission rates. Therefore, to address the above technical problems, it is necessary to provide a single-fiber bidirectional optical module and optical communication system that can simultaneously input and output multiple wavelength beams without increasing the number of optical fibers, thereby improving the overall transmission rate of the single-fiber bidirectional optical module. Summary of the Invention

[0004] The purpose of this invention is to provide a single-fiber bidirectional optical module and optical communication system that can simultaneously input and output multiple wavelengths of light beams without increasing the number of optical fibers, thereby improving the overall transmission rate of the single-fiber bidirectional optical module.

[0005] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution:

[0006] An embodiment of the present invention provides a single-fiber bidirectional optical module, comprising:

[0007] A light-emitting component for emitting a first beam and a second beam;

[0008] An optical fiber assembly for receiving the first beam and the second beam, and for emitting the third beam and the fourth beam;

[0009] An optical receiving component is configured to receive the third beam and the fourth beam; and,

[0010] A wavelength division multiplexing component is disposed on the optical path between the optical transmitting component and the optical fiber component, and on the optical path between the optical fiber component and the optical receiving component;

[0011] The wavelength division multiplexing (WDM) component is configured to: receive the first beam and the second beam, transmit them internally through the WDM component, and then transmit them to the optical fiber component; and receive the third beam and the fourth beam, transmit them internally through the WDM component, and then transmit them to the optical receiving component.

[0012] The wavelengths of the first beam, the second beam, the third beam, and the fourth beam are all different.

[0013] In one or more embodiments, the wavelength division multiplexing component includes a first filter having opposing first and second sides, the first side including a first optical port, a second optical port, a third optical port and a fourth optical port arranged in sequence, and the second side including a fifth optical port.

[0014] Wherein, the first optical port is used to receive the first light beam, the second optical port is used to receive the second light beam, the first light beam and the second light beam leave the first filter through the fifth optical port and are transmitted to the optical fiber assembly; and the fifth optical port is also used to receive the third light beam and the fourth light beam, the third light beam leaves the first filter through the third optical port and is transmitted to the optical receiving assembly, and the fourth light beam leaves the first filter through the fourth optical port and is transmitted to the optical receiving assembly.

[0015] In one or more embodiments, the positions of the first optical port and the fifth optical port correspond; and,

[0016] The first optical port is provided with a first film layer, which allows only the first light beam to pass through and reflects light beams of other wavelengths; the second optical port is provided with a second film layer, which allows only the second light beam to pass through and reflects light beams of other wavelengths; the third optical port is provided with a third film layer, which allows only the third light beam to pass through and reflects light beams of other wavelengths; and the fourth optical port is provided with a fourth film layer, which allows only the fourth light beam to pass through and reflects light beams of other wavelengths.

[0017] In one or more embodiments, the fourth optical port corresponds to the fifth optical port; and,

[0018] The second optical port is provided with a second film layer, which allows only the second light beam to pass through while reflecting light beams of other wavelengths; the third optical port is provided with a third film layer, which allows only the third light beam to pass through while reflecting light beams of other wavelengths; the fourth optical port is provided with a fourth film layer, which allows only the fourth light beam to pass through while reflecting light beams of other wavelengths.

[0019] In one or more embodiments, a fifth film layer is provided at the first optical port, the fifth film layer allowing light beams of any wavelength to pass through.

[0020] In one or more embodiments, a deflection element is further included, the deflection element being disposed in the optical path between the light emitting component and the first filter;

[0021] Wherein, the first optical port and the second optical port correspond to the deflection element, the third optical port and the fourth optical port correspond to the optical receiving component, and the fifth optical port corresponds to the optical fiber component.

[0022] In one or more embodiments, the wavelength division multiplexing component includes a first filter having opposing first and second sides, the first side including a first optical port, a third optical port and a fourth optical port arranged in sequence, and the second side including a fifth optical port.

[0023] Wherein, the first optical port is used to receive the first beam and the second beam, the first beam and the second beam leave the first filter through the fifth optical port and are transmitted to the optical fiber assembly; and the fifth optical port is also used to receive the third beam and the fourth beam, the third beam leaves the first filter through the third optical port and is transmitted to the optical receiving assembly, and the fourth beam leaves the first filter through the fourth optical port and is transmitted to the optical receiving assembly.

[0024] In one or more embodiments, the positions of the first optical port and the fifth optical port correspond; and,

[0025] The first optical port is provided with a sixth film layer, which allows only the first and second light beams to pass through while reflecting light beams of other wavelengths; the third optical port is provided with a third film layer, which allows only the third light beam to pass through while reflecting light beams of other wavelengths; the fourth optical port is provided with a fourth film layer, which allows only the fourth light beam to pass through while reflecting light beams of other wavelengths.

[0026] In one or more embodiments, the fourth optical port corresponds to the fifth optical port; and,

[0027] The third optical port is provided with a third film layer, which allows only the third light beam to pass through while reflecting light beams of other wavelengths; the fourth optical port is provided with a fourth film layer, which allows only the fourth light beam to pass through while reflecting light beams of other wavelengths.

[0028] In one or more embodiments, a fifth film layer is provided at the first optical port, the fifth film layer allowing light beams of any wavelength to pass through.

[0029] In one or more embodiments, a deflection element is further included, the deflection element being disposed in the optical path between the light emitting component and the first filter;

[0030] Wherein, the first optical port corresponds to the deflection element, the third and fourth optical ports correspond to the optical receiving component, and the fifth optical port corresponds to the optical fiber component.

[0031] In one or more embodiments, the light emitting component and the light receiving component are disposed adjacent to each other;

[0032] Wherein, the first optical port corresponds to the optical transmitting component, the third and fourth optical ports correspond to the optical receiving component, and the fifth optical port corresponds to the optical fiber component.

[0033] In one or more embodiments, the second side is provided with a seventh film layer, which reflects light beams of any wavelength; wherein the position of the seventh film layer does not overlap with that of the fifth optical port.

[0034] In one or more embodiments, the wavelength division multiplexing component includes a first filter and a second filter. The first filter is disposed on the optical path between the optical transmitting component and the optical fiber component, and the second filter is disposed on the optical path between the optical fiber component and the optical receiving component. The first filter has opposing first and second sides. The first side includes a first optical port, and the second side includes a fifth optical port and a sixth optical port. The second filter has opposing third and fourth sides. The third side includes a seventh optical port, and the fourth side includes a third optical port and a fourth optical port.

[0035] Wherein, the first optical port is used to receive the first beam and the second beam, the first beam and the second beam leave the first filter through the fifth optical port and are transmitted to the optical fiber assembly; and the fifth optical port is also used to receive the third beam and the fourth beam, the third beam and the fourth beam are reflected by the first optical port and leave the first filter through the sixth optical port and are transmitted to the second filter; the seventh optical port is used to receive the third beam and the fourth beam, the third beam leaves the second filter through the third optical port and is transmitted to the optical receiving assembly, and the fourth beam leaves the second filter through the fourth optical port and is transmitted to the optical receiving assembly.

[0036] In one or more embodiments, a sixth film layer is provided at the first optical port, the sixth film layer only allowing the first light beam and the second light beam to pass through while reflecting light beams of other wavelengths;

[0037] The seventh optical port corresponds to the position of the third optical port. The third optical port is provided with a third film layer, which only allows the third light beam to pass through and reflects light beams of other wavelengths; or, the seventh optical port corresponds to the position of the fourth optical port. The fourth optical port is provided with a fourth film layer, which only allows the fourth light beam to pass through and reflects light beams of other wavelengths.

[0038] In one or more embodiments, a reflective element is further included, the reflective element being disposed in the optical path between the first filter and the second filter;

[0039] Wherein, the first optical port corresponds to the optical transmitting component, the fifth optical port corresponds to the optical fiber component, the sixth optical port corresponds to the reflective element, the seventh optical port corresponds to the reflective element, and the third and fourth optical ports correspond to the optical receiving component.

[0040] In one or more embodiments, the third side surface is provided with a seventh film layer, which reflects light beams of any wavelength; wherein the position of the seventh film layer does not overlap with that of the seventh optical port.

[0041] In one or more embodiments, a first collimating element is further included, disposed adjacent to the light emitting component, the first collimating element being configured to: receive the first light beam and the second light beam emitted by the light emitting component, and convert the first light beam and the second light beam into collimated beams; and / or,

[0042] The single-fiber bidirectional optical module further includes a second collimating element disposed adjacent to the optical fiber assembly. The second collimating element is configured to: receive the first beam and the second beam transmitted within the wavelength division multiplexing assembly, and convert the first beam and the second beam into collimated beams; and receive the third beam and the fourth beam emitted by the optical fiber assembly, and convert the third beam and the fourth beam into collimated beams.

[0043] In one or more embodiments, the incident angles of the first beam and the second beam relative to the wavelength division multiplexing assembly are between 12 degrees and 15 degrees; and / or,

[0044] The incident angles of the third beam and the fourth beam relative to the wavelength division multiplexing component are between 12 and 15 degrees.

[0045] An embodiment of the present invention provides an optical communication system comprising at least two of the above-described single-fiber bidirectional optical modules.

[0046] Compared with existing technologies, the embodiments of the present invention provide a single-fiber bidirectional optical module and optical communication system. The single-fiber bidirectional optical module includes an optical transmitting component, an optical fiber component, an optical receiving component, and a wavelength division multiplexing (WDM) component. The optical transmitting component is used to transmit a first light beam and a second light beam. The optical fiber component is used to receive the first light beam and the second light beam, and to transmit a third light beam and a fourth light beam. The optical receiving component is used to receive the third light beam and the fourth light beam. The WDM component is disposed on the optical path between the optical transmitting component and the optical fiber component, and on the optical path between the optical fiber component and the optical receiving component. The WDM component is configured to: receive the first light beam and the second light beam, and after internal transmission within the WDM component, transmit them to the optical fiber component; and receive the third light beam and the fourth light beam, and after internal transmission within the WDM component, transmit them to the optical receiving component. The wavelengths of the first light beam, the second light beam, the third light beam, and the fourth light beam are all different. This allows a single optical fiber component to simultaneously input and output at least two wavelengths of light, saving deployment costs of the optical fiber component and improving the transmission rate of the single-fiber bidirectional optical module. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the optical path structure of the optical communication system in the first embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of the optical path structure of the optical communication system in the second embodiment of the present invention;

[0050] Figure 3 This is a schematic diagram of the optical path structure of the optical communication system in the third embodiment of the present invention;

[0051] Figure 4 This is a schematic diagram of the optical path structure of the optical communication system in the fourth embodiment of the present invention;

[0052] Figure 5 This is a schematic diagram of the optical path structure of the optical communication system in the fifth embodiment of the present invention;

[0053] Figure 6 This is a schematic diagram of the optical path structure of the optical communication system in the sixth embodiment of the present invention. Detailed Implementation

[0054] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0055] Please see Figures 1 to 6 , Figures 1 to 6 The diagrams provided are schematic representations of the optical path structures of optical communication systems in different embodiments of the present invention. Each optical communication system includes at least two single-fiber bidirectional (BIDI) optical modules. Each single-fiber bidirectional optical module includes an optical transmitting component 1, an optical fiber component 5, an optical receiving component 2, and a wavelength division multiplexing (Z-Block) component 4. It should be noted that the wavelength division multiplexing components 4 differ in the different embodiments of the present invention. Therefore, different wavelength division multiplexing components are labeled as 4(A) to 4(E) in the accompanying drawings to distinguish them. When "wavelength division multiplexing component 4" is mentioned below, it should be understood as a description of the common features of wavelength division multiplexing components 4(A) to 4(E), and will not be repeated. It should be noted that the optical communication system in this embodiment includes two of the above-mentioned single-fiber bidirectional optical modules. However, the number of single-fiber bidirectional optical modules in this embodiment is only used to assist in understanding the scheme of the present invention and is not limited to this in practice.

[0056] In the single-fiber bidirectional optical module, the optical emitting component 1 is used to emit at least a first beam Tx1 and a second beam Tx2. In this embodiment, the optical emitting component 1 includes a laser unit 11 and an optical modulation unit 12 (e.g., a silicon photonics chip). For example, there are two laser units 11, each emitting a beam to form two beams of different wavelengths. These two beams of different wavelengths are modulated by the optical modulation unit 12 to form the first beam Tx1 and the second beam Tx2. The first beam Tx1 and the second beam Tx2 can be understood as the input beams of the fiber optic component 5. Figure 1 and Figure 2As shown, the waveguide design inside the optical modulation unit 12 can also divide the beam emitted by the same laser unit 11 into multiple parts (in this embodiment, it is exemplified as splitting into two), thereby forming two first beams Tx1 / Tx1' and two second beams Tx2 / Tx2', which are respectively used by at least two single-fiber bidirectional optical modules in the optical communication system. In other words, the two first beams Tx1 / Tx1' have the same wavelength, the two second beams Tx2 / Tx2' have the same wavelength, and the wavelengths of the first beams Tx1 / Tx1' and the second beams Tx2 / Tx2' are different. It should be noted that when describing the single-fiber bidirectional optical module below, only the first beam Tx1 is used as an example. Unless otherwise specified, the first beam Tx1' can be understood in the same way in its corresponding other single-fiber bidirectional optical module; the situation of the second beams Tx2 and Tx2' is similar and will not be described again. Fiber optic assembly 5 is used to receive the first beam Tx1 and the second beam Tx2, and to emit at least a third beam Rx1 and a fourth beam Rx2, wherein the wavelengths of the third beam Rx1 and the fourth beam Rx2 are different. The third beam Rx1 and the fourth beam Rx2 can be understood as the output beams of fiber optic assembly 5. Optical receiving assembly 2 is used to receive the third beam Rx1 and the fourth beam Rx2. Optical receiving assembly 2 includes a transimpedance amplification unit, a photodetector unit, and related optical elements; however, practical applications are not limited to this. In some embodiments, such as... Figure 1 , Figures 4 to 6 As shown, the fiber optic assembly 5 can be a fiber optic array with at least two fibers (in this embodiment, for example, two fibers). Each fiber receives a first beam Tx1 and a second beam Tx2, and emits a third beam Rx1 and a fourth beam Rx2. That is, the two single-fiber bidirectional optical modules in the optical communication system share the same fiber optic assembly 5; or, as shown... Figure 2 and Figure 3 As shown, the optical fiber assembly 5 can also be a single optical fiber to receive a first beam Tx1 and a second beam Tx2, and to transmit a third beam Rx1 and a fourth beam Rx2. That is, the two single-fiber bidirectional optical modules in the optical communication system use independent optical fiber assemblies 5 respectively; however, the actual application is not limited to this.

[0057] Based on the above, the wavelength division multiplexing (WDM) component 4 is disposed on the optical path between the optical transmitting component 1 and the optical fiber component 5, and on the optical path between the optical fiber component 5 and the optical receiving component 2. The WDM component 4 is configured to: receive a first beam Tx1 and a second beam Tx2, transmit them internally to the optical fiber component 5, and receive a third beam Rx1 and a fourth beam Rx2, transmit them internally to the optical receiving component 2, and transmit them to the optical receiving component 2. The wavelengths of the first beam Tx1, the second beam Tx2, the third beam Rx1, and the fourth beam Rx2 are all different. Thus, a single-fiber bidirectional optical module only needs to deploy one optical fiber to receive at least two beams of different wavelengths (the first beam Tx1 and the second beam Tx2). The same optical fiber can also emit two beams of different wavelengths (the third beam Rx1 and the fourth beam Rx2) and transmit them to the optical receiving component 2 respectively. This allows for the simultaneous input and output of multiple wavelength beams without increasing the number of optical fibers, thereby improving the transmission rate of the single-fiber bidirectional optical module and saving the deployment space and cost of the optical fiber component 5.

[0058] In a first embodiment of the present invention, as Figure 1As shown, the optical communication system includes two single-fiber bidirectional optical modules. The optical paths of the two single-fiber bidirectional optical modules are designed with symmetrical phase axes (i.e., the wavelength division multiplexing (WDM) components 4(A) in the two single-fiber bidirectional optical modules are arranged with an axisymmetric structure). Therefore, one of the single-fiber bidirectional optical modules is used as an example for illustration. The WDM component 4(A) includes a first filter 41, which has opposing first and second sides. The first side includes a first optical port L1, a second optical port L2, a third optical port L3, and a fourth optical port L4 arranged in sequence. The second side includes a fifth optical port L5. In this embodiment, the WDM component 4(A) also includes multiple light-transmitting elements (e.g., glass blocks, not shown in the figure) and is respectively disposed at the first optical port L1, the second optical port L2, the third optical port L3, and the fourth optical port L4 to adjust the incident or exit angle of the light beam relative to the corresponding optical port, but this is not a limitation. Specifically, the first optical port L1 is used to receive the first beam Tx1, and the second optical port L2 is used to receive the second beam Tx2. The first beam Tx1 and the second beam Tx2 exit the first filter 41 through the fifth optical port L5 and are transmitted to the optical fiber assembly 5. The fifth optical port L5 is also used to receive the third beam Rx1 and the fourth beam Rx2. The third beam Rx1 exits the first filter 41 through the third optical port L3 and is transmitted to the optical receiving assembly 2. The fourth beam Rx2 exits the first filter 41 through the fourth optical port L4 and is transmitted to the optical receiving assembly 2. In other words, the first beam Tx1 and the second beam Tx2, the third beam Rx1 and the fourth beam Rx2 all exit or enter the first filter 41 through the same fifth optical port L5. The optical paths of the first beam Tx1, the second beam Tx2, the third beam Rx1 and the fourth beam Rx2 overlap at least near the fifth optical port L5, effectively improving the space utilization of the optical path layout and further reducing the deployment cost of the single-fiber bidirectional optical module and the optical communication system.

[0059] Preferably, the fourth optical port L4 and the fifth optical port L5 are positioned correspondingly. It should be noted that the corresponding positions of the fourth optical port L4 and the fifth optical port L5 mean that the light beam transmitted inside the first filter 41 can be directly transmitted from one optical port (e.g., the fifth optical port L5) to another optical port (e.g., the fourth optical port L4) without changing the original transmission path (e.g., reflection or refraction). The description of one optical port corresponding to the position of an optical element, component, or another optical port below is the same and will not be repeated. The second optical port L2 is provided with a second film layer f2, which only allows the second light beam Tx2 to pass through while reflecting other wavelengths of light; the third optical port L3 is provided with a third film layer f3, which only allows the third light beam Rx1 to pass through while reflecting other wavelengths of light; the fourth optical port L4 is provided with a fourth film layer f4, which only allows the fourth light beam Rx2 to pass through while reflecting other wavelengths of light. It should be noted that the film layer that allows light beams of a certain wavelength to pass through while reflecting light beams of other wavelengths (i.e., the selective transmittance and reflectance film layer) can be formed by stacking high-refractive-index and low-refractive-index materials such as SiO2 (silicon dioxide), TiO2 (titanium dioxide), Ta2O5 (tantalum pentoxide), and MgF2 (magnesium fluoride) alternately. The multilayer dielectric film can be coated on the first filter 41 by processes such as physical vapor deposition (PVD) and ion-assisted deposition (IAD). The selective transmittance and reflectance film layer mentioned below is similar and will not be described in detail.

[0060] Preferably, the second side surface is provided with a seventh film layer f7, which reflects light beams of any wavelength. The seventh film layer f7 does not overlap with the fifth optical port L5. The seventh film layer f7 can be a high-reflectivity film layer; its material and coating process are common in existing technologies and will not be described further. Preferably, the incident angles of the first beam Tx1 and the second beam Tx2 relative to the wavelength division multiplexing component 4(A) are between 12 and 15 degrees, and / or, the incident angles of the third beam Rx1 and the fourth beam Rx2 relative to the wavelength division multiplexing component 4(A) are between 12 and 15 degrees. The incident angles in other embodiments are similar and will not be described further. Thus, taking the first beam Tx1 as an example... Figure 1 As shown, the first beam Tx1 enters the first filter 41 through the first optical port L1. After undergoing six reflections between the second side (seventh film layer f7) and the first side (second film layer f2, third film layer f3, and fourth film layer f4) of the first filter 41, it is transmitted to the fifth optical port L5 and exits the first filter 41 through the fifth optical port L5. The transmission paths of other beams inside the first filter 41 are similar, so that the optical paths of the first beam Tx1, the second beam Tx2, the third beam Rx1, and the fourth beam Rx2 at least partially overlap, thereby making the optical path layout more compact.

[0061] In this embodiment, a fifth film layer f5 is provided at the first optical port L1. The fifth film layer f5 allows light beams of any wavelength to pass through. The fifth film layer f5 can be an anti-reflection (AR) film layer. In other embodiments, the first optical port L1 may not have a film layer; however, practical applications are not limited to this. In addition, the first optical port L1 may also have a first film layer f1. The first film layer f1 only allows the first light beam Tx1 to pass through and reflects light beams of other wavelengths. It should be noted that although the first optical port L1 in the first embodiment only overlaps with the transmission path of the first light beam Tx1, the first filter 41 with the first film layer f1 at the first optical port L1 can also be applied to other optical path designs to improve the versatility of the wavelength division multiplexing component 4(A). Similar cases in the following text can all be designed in the same way, and are not limited thereto.

[0062] Preferably, the single-fiber bidirectional optical module further includes a deflection element 3 (e.g., a deflection prism). The deflection element 3 may have a high-reflectivity film layer and is disposed on the optical path between the optical emitting component 1 and the first filter 41. The first optical port L1 and the second optical port L2 correspond to the deflection element 3, the third optical port L3 and the fourth optical port L4 correspond to the optical receiving component 2, and the fifth optical port L5 corresponds to the fiber optic component 5. That is, the optical paths of the first beam Tx1 and the second beam Tx2 are at least partially non-parallel to the optical paths of the third beam Rx1 and the fourth beam Rx2. Thus, the optical emitting component 1 and the optical receiving component 2 can be independently disposed at two different locations in the optical communication system, which facilitates the miniaturization of the optical emitting component 1 and the optical receiving component 2, improves the space utilization of the optical communication system, and ultimately results in a miniaturized optical communication system.

[0063] In a second embodiment of the invention, such as Figure 2 As shown, the optical communication system includes two single-fiber bidirectional optical modules. The parts identical to those in the first embodiment will not be described again. The difference lies in the asymmetrical optical path design of the two single-fiber bidirectional optical modules (i.e., the wavelength division multiplexing component 4(B) in the two single-fiber bidirectional optical modules is not arranged in an axisymmetric structure). Therefore, for... Figure 2The single-fiber bidirectional optical module corresponding to the lower half of the wavelength division multiplexing component 4(B) will be described below. The wavelength division multiplexing component 4(B) includes a first filter 41, which has opposing first and second sides. The first side includes a first optical port L1, a second optical port L2, a third optical port L3, and a fourth optical port L4 arranged in sequence. The second side includes a fifth optical port L5. In this embodiment, the wavelength division multiplexing component 4(B) also includes multiple light-transmitting elements (e.g., glass blocks, not shown in the figure) respectively disposed at the first optical port L1, the second optical port L2, the third optical port L3, and the fourth optical port L4 to adjust the incident or exit angle of the light beam relative to the corresponding optical port, but this is not a limitation. Specifically, the first optical port L1 is used to receive the first beam Tx1, the second optical port L2 is used to receive the second beam Tx2, the first beam Tx1 and the second beam Tx2 leave the first filter 41 through the fifth optical port L5 and are transmitted to the optical fiber assembly 5; and the fifth optical port L5 is also used to receive the third beam Rx1 and the fourth beam Rx2, the third beam Rx1 leaves the first filter 41 through the third optical port L3 and is transmitted to the optical receiving assembly 2, and the fourth beam Rx2 leaves the first filter 41 through the fourth optical port L4 and is transmitted to the optical receiving assembly 2.

[0064] Preferably, the positions of the first optical port L1 and the fifth optical port L5 correspond to each other. The first optical port L1 is provided with a first film layer f1, which allows only the first light beam Tx1 to pass through while reflecting light beams of other wavelengths. The second optical port L2 is provided with a second film layer f2, which allows only the second light beam Tx2 to pass through while reflecting light beams of other wavelengths. The third optical port L3 is provided with a third film layer f3, which allows only the third light beam Rx1 to pass through while reflecting light beams of other wavelengths. The fourth optical port L4 is provided with a fourth film layer f4, which allows only the fourth light beam Rx2 to pass through while reflecting light beams of other wavelengths. It should be noted that, as... Figure 1 and Figure 2 As shown, in the second embodiment, the wavelength division multiplexing component 4(B) is integrally formed, and the fourth optical ports L4 of the two single-fiber bidirectional optical modules are arranged adjacently, so the fourth film layer f4 can be coated only once. Compared with the first embodiment, the second embodiment can reduce the production steps of the wavelength division multiplexing component 4(B) and improve efficiency.

[0065] Preferably, the single-fiber bidirectional optical module further includes a deflection element 3 (e.g., a deflection prism). The deflection element 3 may have a high-reflectivity film layer and is disposed on the optical path between the optical emitting component 1 and the first filter 41. The first optical port L1 and the second optical port L2 correspond to the deflection element 3, the third optical port L3 and the fourth optical port L4 correspond to the optical receiving component 2, and the fifth optical port L5 corresponds to the fiber optic component 5. That is, the optical paths of the first beam Tx1 and the second beam Tx2 are at least partially non-parallel to the optical paths of the third beam Rx1 and the fourth beam Rx2. Thus, the optical emitting component 1 and the optical receiving component 2 can be independently disposed at two different locations in the optical communication system, which facilitates the miniaturization of the optical emitting component 1 and the optical receiving component 2, improves the space utilization of the optical communication system, and ultimately results in a miniaturized optical communication system.

[0066] In a third embodiment of the invention, such as Figure 3 As shown, the optical communication system includes two single-fiber bidirectional optical modules. The optical paths of the two single-fiber bidirectional optical modules are asymmetrically designed (i.e., the wavelength division multiplexing (WDM) components 4(C) in the two single-fiber bidirectional optical modules are not arranged in an axisymmetric structure). The parts that are the same as in the second embodiment will not be described again. The difference is that the optical transmitting component 1' combines the first beam Tx1 and the second beam Tx2 into a combined beam for transmission. The first optical port L1 of the first filter 41' of the WDM component 4(C) is used to receive the first beam Tx1 and the second beam Tx2. In other words, the first filter 41' of the WDM component 4(C) does not have the second optical port L2 of the first filter 41 of the WDM component 4(A) or WDM component 4(B). Specifically, the WDM component 4(C) includes a first filter 41', which has a first side and a second side. The first side includes a first optical port L1, a third optical port L3, and a fourth optical port L4 arranged in sequence, and the second side includes a fifth optical port L5. In this embodiment, the wavelength division multiplexing component 4(C) further includes multiple light-transmitting elements (e.g., glass blocks, not shown in the figure) and is respectively disposed at the first optical port L1, the third optical port L3, and the fourth optical port L4 to adjust the incident or exit angle of the light beam relative to the corresponding optical port, but is not limited thereto. Specifically, the first optical port L1 is used to receive the first light beam Tx1 and the second light beam Tx2. The first light beam Tx1 and the second light beam Tx2 exit the first filter 41' via the fifth optical port L5 and are transmitted to the optical fiber component 5. The fifth optical port L5 is also used to receive the third light beam Rx1 and the fourth light beam Rx2. The third light beam Rx1 exits the first filter 41' via the third optical port L3 and is transmitted to the optical receiving component 2. The fourth light beam Rx2 exits the first filter 41' via the fourth optical port L4 and is transmitted to the optical receiving component 2.

[0067] It should be noted that in the third embodiment, the first beam Tx1 and the second beam Tx2 are combined into a combined beam for emission, which has the effect of reducing the size of the optical emission component 1' and the wavelength division multiplexing component 4(C), thus facilitating the miniaturization of the optical communication system.

[0068] Better, such as Figure 3 As shown, Figure 3 The first optical port L1 of the first filter 41' of the wavelength division multiplexing component 4(C) in the upper half corresponds to the position of the fifth optical port L5. A sixth film layer f6 is provided at the first optical port L1. The sixth film layer f6 only allows the first beam Tx1 and the second beam Tx2 to pass through and reflects beams of other wavelengths. A third film layer f3 is provided at the third optical port L3. The third film layer f3 only allows the third beam Rx1 to pass through and reflects beams of other wavelengths. A fourth film layer f4 is provided at the fourth optical port L4. The fourth film layer f4 only allows the fourth beam Rx2 to pass through and reflects beams of other wavelengths.

[0069] Better, such as Figure 3 As shown, Figure 3 In the lower half of the wavelength division multiplexing component 4(C), the fourth optical port L4 of the first filter 41' corresponds to the fifth optical port L5. A fifth film layer f5 (e.g., an anti-reflection film layer) may be provided at the first optical port L1, allowing light beams of any wavelength to pass through; alternatively, no film layer may be provided at the first optical port L1; however, practical applications are not limited to this. Furthermore, a third film layer f3 is provided at the third optical port L3, allowing only the third light beam Rx1 to pass through while reflecting light beams of other wavelengths; a fourth film layer f4 is provided at the fourth optical port L4, allowing only the fourth light beam Rx2 to pass through while reflecting light beams of other wavelengths.

[0070] Preferably, the single-fiber bidirectional optical module further includes a deflection element 3, disposed on the optical path between the optical transmitting component 1' and the first filter 41. Specifically, the first optical port L1 corresponds to the deflection element 3, the third optical port L3 and the fourth optical port L4 correspond to the optical receiving component 2, and the fifth optical port L5 corresponds to the fiber optic component 5. That is, the optical paths of the first beam Tx1 and the second beam Tx2 are at least partially non-parallel to the optical paths of the third beam Rx1 and the fourth beam Rx2. Thus, the optical transmitting component 1' and the optical receiving component 2 can be independently disposed at two different locations in the optical communication system, which facilitates the miniaturization of the optical transmitting component 1' and the optical receiving component 2, improves the space utilization of the optical communication system, and ultimately results in a miniaturized optical communication system.

[0071] In the fourth embodiment of the present invention, such as Figure 4As shown, the optical communication system includes two single-fiber bidirectional optical modules. The parts identical to those in the third embodiment will not be repeated. The difference lies in the symmetrical optical path design of the two single-fiber bidirectional optical modules (i.e., the wavelength division multiplexing (WDM) components 4(D) in the two single-fiber bidirectional optical modules are arranged with an axisymmetric structure). Therefore, one single-fiber bidirectional optical module is used as an example. The WDM component 4(D) includes a first filter 41', which has opposing first and second sides. The first side includes a first optical port L1, a third optical port L3, and a fourth optical port L4 arranged in sequence. The second side includes a fifth optical port L5. In this embodiment, the WDM component 4(D) also includes multiple light-transmitting elements (e.g., glass blocks, not shown in the figure) respectively disposed at the first optical port L1, the third optical port L3, and the fourth optical port L4 to adjust the incident or exit angle of the light beam relative to the corresponding optical port, but this is not a limitation. The first optical port L1 is used to receive the first beam Tx1 and the second beam Tx2. The first beam Tx1 and the second beam Tx2 leave the first filter 41' through the fifth optical port L5 and are transmitted to the optical fiber assembly 5. The fifth optical port L5 is also used to receive the third beam Rx1 and the fourth beam Rx2. The third beam Rx1 leaves the first filter 41' through the third optical port L3 and is transmitted to the optical receiving assembly 2. The fourth beam Rx2 leaves the first filter 41' through the fourth optical port L4 and is transmitted to the optical receiving assembly 2.

[0072] It should be noted that in the fourth embodiment, the first beam Tx1 and the second beam Tx2 are combined into a combined beam for emission, which has the effect of reducing the size of the optical emission component 1' and the wavelength division multiplexing component 4(D), thus facilitating the miniaturization of the optical communication system.

[0073] Preferably, the fourth optical port L4 and the fifth optical port L5 are positioned correspondingly, and a third film layer f3 is provided at the third optical port L3. The third film layer f3 only allows the third light beam Rx1 to pass through and reflects light beams of other wavelengths; a fourth film layer f4 is provided at the fourth optical port L4. The fourth film layer f4 only allows the fourth light beam Rx2 to pass through and reflects light beams of other wavelengths.

[0074] Preferably, a fifth film layer f5 (e.g., an anti-reflection film layer) can be provided at the first optical port L1, allowing light beams of any wavelength to pass through; alternatively, no film layer may be provided at the first optical port L1; however, practical applications are not limited to this. It should be noted that, as... Figure 3 and Figure 4As shown, in the fourth embodiment, a fifth film layer f5 can be provided at both first optical ports L1 of the wavelength division multiplexing component 4(D) or no film layer can be provided. Compared with the third embodiment, which requires a sixth film layer f6 at one of the first optical ports L1, which only allows the first beam Tx1 and the second beam Tx2 to pass through and reflects beams of other wavelengths, the cost of coating the film layer in the fourth embodiment is much lower than that in the third embodiment.

[0075] Preferably, the single-fiber bidirectional optical module further includes a deflection element 3, disposed on the optical path between the optical transmitting component 1' and the first filter 41. Specifically, the first optical port L1 corresponds to the deflection element 3, the third optical port L3 and the fourth optical port L4 correspond to the optical receiving component 2, and the fifth optical port L5 corresponds to the fiber optic component 5. That is, the optical paths of the first beam Tx1 and the second beam Tx2 are at least partially non-parallel to the optical paths of the third beam Rx1 and the fourth beam Rx2. Thus, the optical transmitting component 1' and the optical receiving component 2 can be independently disposed at two different locations in the optical communication system, which facilitates the miniaturization of the optical transmitting component 1' and the optical receiving component 2, improves the space utilization of the optical communication system, and ultimately results in a miniaturized optical communication system.

[0076] In the fifth embodiment of the present invention, as Figure 5 As shown, the parts that are the same as in the fourth embodiment will not be repeated. The difference is that the optical transmitting component 1' and the optical receiving component 2 are arranged adjacent to each other. The first optical port L1 corresponds to the optical transmitting component 1', the third optical port L3 and the fourth optical port L4 correspond to the optical receiving component 2, and the fifth optical port L5 corresponds to the optical fiber component 5. In other words, the optical transmitting component 1' and the optical receiving component 2 are arranged in the same optical transmission component 10, and the light beam emitted by the optical transmitting component 1' is directly transmitted to the first optical port L1.

[0077] In the sixth embodiment of the present invention, such as Figure 6As shown, the optical emitting component 1' in the sixth embodiment is the same as the optical emitting component 1' in the third and fourth embodiments, that is, the optical emitting component 1' in the sixth embodiment also combines the first beam Tx1 and the second beam Tx2 into a combined beam for transmission. The wavelength division multiplexing component 4(E) includes a first filter 41” and a second filter 42. The first filter 41” is disposed on the optical path between the optical emitting component 1' and the optical fiber component 5, and the second filter 42 is disposed on the optical path between the optical fiber component 5 and the optical receiving component 2. The first filter 41” has opposing first and second sides. The first side includes a first optical port L1, and the second side includes a fifth optical port L5 and a sixth optical port L6. The second filter 42 has opposing third and fourth sides. The third side includes a seventh optical port L7, and the fourth side includes a third optical port L3 and a fourth optical port L4. The first optical port L1 is used to receive the first beam Tx1 and the second beam Tx2. The first beam Tx1 and the second beam Tx2 leave the first filter 41” via the fifth optical port L5 and are transmitted to… Fiber optic assembly 5; and, the fifth optical port L5 is also used to receive the third beam Rx1 and the fourth beam Rx2. The third beam Rx1 and the fourth beam Rx2 are reflected by the first optical port L1 and leave the first filter 41” through the sixth optical port L6 and are transmitted to the second filter 42. The seventh optical port L7 is used to receive the third beam Rx1 and the fourth beam Rx2. The third beam Rx1 leaves the second filter 42 through the third optical port L3 and is transmitted to the optical receiving assembly 2. The fourth beam Rx2 leaves the second filter 42 through the fourth optical port L4 and is transmitted to the optical receiving assembly 2.

[0078] Preferably, a sixth film layer f6 is provided at the first optical port L1. The sixth film layer f6 only allows the first light beam Tx1 and the second light beam Tx2 to pass through while reflecting light beams of other wavelengths. It is the same as the sixth film layer f6 mentioned in the third embodiment, and will not be described again.

[0079] Preferably, the seventh optical port L7 corresponds to the third optical port L3, and a third film layer f3 is provided at the third optical port L3. The third film layer f3 only allows the third light beam Rx1 to pass through while reflecting light beams of other wavelengths. Alternatively, the seventh optical port L7 corresponds to the fourth optical port L4, and a fourth film layer f4 is provided at the fourth optical port L4. The fourth film layer f4 only allows the fourth light beam Rx2 to pass through while reflecting light beams of other wavelengths.

[0080] Preferably, the single-fiber bidirectional optical module further includes a reflective element 3' (e.g., a mirror), which may have a high-reflectivity film layer and is positioned in the optical path between the first filter 41” and the second filter 42. The first optical port L1 corresponds to the optical transmitting component 1', the fifth optical port L5 corresponds to the fiber optic component 5, the sixth optical port L6 corresponds to the reflective element 3', the seventh optical port L7 corresponds to the reflective element 3', and the third optical port L3 and the fourth optical port L4 correspond to the optical receiving component 2. That is, the transmission of the light beam between the first filter 41” and the second filter 42 will undergo a single reflection via the reflective element 3', eliminating the need for the optical elements or components in the optical path to be arranged along a straight line. This improves the space utilization of the optical communication system, thereby achieving a miniaturized optical communication system.

[0081] Preferably, the third side surface is provided with a seventh film layer f7, which reflects light beams of any wavelength, wherein the position of the seventh film layer f7 does not overlap with that of the seventh optical port L7. This is the same as the seventh film layer f7 mentioned in the other embodiments described above, and will not be repeated here.

[0082] Preferably, the single-fiber bidirectional optical module in any of the above six embodiments further includes a first collimating element 7, disposed adjacent to the optical emitting component 1. The first collimating element 7 is configured to: receive a first beam Tx1 and a second beam Tx2 emitted by the optical emitting component 1, and convert the first beam Tx1 and the second beam Tx2 into collimated beams. And / or, the single-fiber bidirectional optical module in any of the above six embodiments further includes a second collimating element 6, disposed adjacent to the optical fiber component 5. The second collimating element 6 is configured to: receive the first beam Tx1 and the second beam Tx2 after transmission within the wavelength division multiplexing component 4(A), and convert the first beam Tx1 and the second beam Tx2 into collimated beams; and receive a third beam Rx1 and a fourth beam Rx2 emitted by the optical fiber component 5, and convert the third beam Rx1 and the fourth beam Rx2 into collimated beams.

[0083] It should be noted that the above six embodiments are only examples to help understand the present invention. The single-fiber bidirectional optical modules in different embodiments can also be combined to form an optical communication system that is completely different from the above six embodiments. Practical applications are not limited to this.

[0084] In summary, the single-fiber bidirectional optical module and optical communication system provided by the embodiments of the present invention include an optical transmitting component, an optical fiber component, an optical receiving component, and a wavelength division multiplexing (WDM) component. The optical transmitting component emits a first light beam and a second light beam. The optical fiber component receives the first light beam and the second light beam, and emits a third light beam and a fourth light beam. The optical receiving component receives the third light beam and the fourth light beam. The WDM component is disposed on the optical path between the optical transmitting component and the optical fiber component, and on the optical path between the optical fiber component and the optical receiving component. The WDM component is configured to: receive the first light beam and the second light beam, transmit them internally to the optical fiber component, and then transmit them to the optical fiber component; and receive the third light beam and the fourth light beam, transmit them internally to the optical receiving component, and then transmit them to the optical receiving component. The wavelengths of the first light beam, the second light beam, the third light beam, and the fourth light beam are all different. This allows a single optical fiber component to simultaneously input and output at least two wavelengths of light, saving deployment costs of the optical fiber component and improving the transmission rate of the single-fiber bidirectional optical module.

[0085] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0086] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A single-fiber bidirectional optical module, characterized in that, include: A light-emitting component for emitting a first beam and a second beam; An optical fiber assembly for receiving the first beam and the second beam, and for emitting the third beam and the fourth beam; An optical receiving component for receiving the third beam and the fourth beam; as well as, A wavelength division multiplexing component is disposed on the optical path between the optical transmitting component and the optical fiber component, and on the optical path between the optical fiber component and the optical receiving component; The wavelength division multiplexing (WDM) component is configured to: receive the first beam and the second beam, transmit them internally through the WDM component, and then transmit them to the optical fiber component; and receive the third beam and the fourth beam, transmit them internally through the WDM component, and then transmit them to the optical receiving component. The wavelengths of the first beam, the second beam, the third beam, and the fourth beam are all different.

2. The single-fiber bidirectional optical module as described in claim 1, characterized in that, The wavelength division multiplexing component includes a first filter, which has a first side and a second side opposite to each other. The first side includes a first optical port, a second optical port, a third optical port and a fourth optical port arranged in sequence, and the second side includes a fifth optical port. Wherein, the first optical port is used to receive the first light beam, the second optical port is used to receive the second light beam, the first light beam and the second light beam leave the first filter through the fifth optical port and are transmitted to the optical fiber assembly; and the fifth optical port is also used to receive the third light beam and the fourth light beam, the third light beam leaves the first filter through the third optical port and is transmitted to the optical receiving assembly, and the fourth light beam leaves the first filter through the fourth optical port and is transmitted to the optical receiving assembly.

3. The single-fiber bidirectional optical module as described in claim 2, characterized in that, The first optical port corresponds to the position of the fifth optical port; and, The first optical port is provided with a first film layer, which allows only the first light beam to pass through and reflects light beams of other wavelengths; the second optical port is provided with a second film layer, which allows only the second light beam to pass through and reflects light beams of other wavelengths; the third optical port is provided with a third film layer, which allows only the third light beam to pass through and reflects light beams of other wavelengths; and the fourth optical port is provided with a fourth film layer, which allows only the fourth light beam to pass through and reflects light beams of other wavelengths.

4. The single-fiber bidirectional optical module as described in claim 2, characterized in that, The fourth optical port corresponds to the position of the fifth optical port; and, The second optical port is provided with a second film layer, which allows only the second light beam to pass through while reflecting light beams of other wavelengths; the third optical port is provided with a third film layer, which allows only the third light beam to pass through while reflecting light beams of other wavelengths; the fourth optical port is provided with a fourth film layer, which allows only the fourth light beam to pass through while reflecting light beams of other wavelengths.

5. The single-fiber bidirectional optical module as described in claim 4, characterized in that, A fifth film layer is provided at the first optical port, which allows light beams of any wavelength to pass through.

6. The single-fiber bidirectional optical module as described in claim 2, characterized in that, It also includes a deflection element, which is disposed in the optical path between the light emitting component and the first filter; Wherein, the first optical port and the second optical port correspond to the deflection element, the third optical port and the fourth optical port correspond to the optical receiving component, and the fifth optical port corresponds to the optical fiber component.

7. The single-fiber bidirectional optical module as described in claim 1, characterized in that, The wavelength division multiplexing component includes a first filter, which has a first side and a second side opposite to each other. The first side includes a first optical port, a third optical port and a fourth optical port arranged in sequence, and the second side includes a fifth optical port. Wherein, the first optical port is used to receive the first beam and the second beam, the first beam and the second beam leave the first filter through the fifth optical port and are transmitted to the optical fiber assembly; and the fifth optical port is also used to receive the third beam and the fourth beam, the third beam leaves the first filter through the third optical port and is transmitted to the optical receiving assembly, and the fourth beam leaves the first filter through the fourth optical port and is transmitted to the optical receiving assembly.

8. The single-fiber bidirectional optical module as described in claim 7, characterized in that, The first optical port corresponds to the position of the fifth optical port; and, The first optical port is provided with a sixth film layer, which allows only the first and second light beams to pass through while reflecting light beams of other wavelengths; the third optical port is provided with a third film layer, which allows only the third light beam to pass through while reflecting light beams of other wavelengths; the fourth optical port is provided with a fourth film layer, which allows only the fourth light beam to pass through while reflecting light beams of other wavelengths.

9. The single-fiber bidirectional optical module as described in claim 7, characterized in that, The fourth optical port corresponds to the position of the fifth optical port; and, The third optical port is provided with a third film layer, which allows only the third light beam to pass through while reflecting light beams of other wavelengths; the fourth optical port is provided with a fourth film layer, which allows only the fourth light beam to pass through while reflecting light beams of other wavelengths.

10. The single-fiber bidirectional optical module as described in claim 9, characterized in that, A fifth film layer is provided at the first optical port, which allows light beams of any wavelength to pass through.

11. The single-fiber bidirectional optical module as described in claim 7, characterized in that, It also includes a deflection element, which is disposed in the optical path between the light emitting component and the first filter; Wherein, the first optical port corresponds to the deflection element, the third and fourth optical ports correspond to the optical receiving component, and the fifth optical port corresponds to the optical fiber component.

12. The single-fiber bidirectional optical module as described in claim 7, characterized in that, The optical emitting component and the optical receiving component are arranged adjacent to each other; Wherein, the first optical port corresponds to the optical transmitting component, the third and fourth optical ports correspond to the optical receiving component, and the fifth optical port corresponds to the optical fiber component.

13. The single-fiber bidirectional optical module as described in claim 2 or 7, characterized in that, The second side is provided with a seventh film layer, which reflects light beams of any wavelength; wherein the position of the seventh film layer does not overlap with that of the fifth optical port.

14. The single-fiber bidirectional optical module as described in claim 1, characterized in that, The wavelength division multiplexing (WDM) component includes a first filter and a second filter. The first filter is disposed on the optical path between the optical transmitting component and the optical fiber component, and the second filter is disposed on the optical path between the optical fiber component and the optical receiving component. The first filter has opposing first and second sides. The first side includes a first optical port, and the second side includes a fifth optical port and a sixth optical port. The second filter has opposing third and fourth sides. The third side includes a seventh optical port, and the fourth side includes a third optical port and a fourth optical port. Wherein, the first optical port is used to receive the first beam and the second beam, the first beam and the second beam leave the first filter through the fifth optical port and are transmitted to the optical fiber assembly; and the fifth optical port is also used to receive the third beam and the fourth beam, the third beam and the fourth beam are reflected by the first optical port and leave the first filter through the sixth optical port and are transmitted to the second filter; the seventh optical port is used to receive the third beam and the fourth beam, the third beam leaves the second filter through the third optical port and is transmitted to the optical receiving assembly, and the fourth beam leaves the second filter through the fourth optical port and is transmitted to the optical receiving assembly.

15. The single-fiber bidirectional optical module as described in claim 14, characterized in that, A sixth film layer is provided at the first optical port, which only allows the first light beam and the second light beam to pass through while reflecting light beams of other wavelengths; The seventh optical port corresponds to the position of the third optical port. The third optical port is provided with a third film layer, which only allows the third light beam to pass through and reflects light beams of other wavelengths; or, the seventh optical port corresponds to the position of the fourth optical port. The fourth optical port is provided with a fourth film layer, which only allows the fourth light beam to pass through and reflects light beams of other wavelengths.

16. The single-fiber bidirectional optical module as described in claim 14, characterized in that, It also includes a reflective element, which is disposed in the optical path between the first filter and the second filter; Wherein, the first optical port corresponds to the optical transmitting component, the fifth optical port corresponds to the optical fiber component, the sixth optical port corresponds to the reflective element, the seventh optical port corresponds to the reflective element, and the third and fourth optical ports correspond to the optical receiving component.

17. The single-fiber bidirectional optical module as described in claim 14, characterized in that, The third side surface is provided with a seventh film layer, which reflects light beams of any wavelength; wherein the position of the seventh film layer does not overlap with that of the seventh optical port.

18. The single-fiber bidirectional optical module as described in claim 1, characterized in that, It also includes a first collimating element disposed adjacent to the light emitting assembly, the first collimating element being configured to: receive the first light beam and the second light beam emitted by the light emitting assembly, and convert the first light beam and the second light beam into a collimated light beam; and / or, The single-fiber bidirectional optical module further includes a second collimating element disposed adjacent to the optical fiber assembly. The second collimating element is configured to: receive the first beam and the second beam transmitted within the wavelength division multiplexing assembly, and convert the first beam and the second beam into collimated beams; and receive the third beam and the fourth beam emitted by the optical fiber assembly, and convert the third beam and the fourth beam into collimated beams.

19. The single-fiber bidirectional optical module as described in claim 1, characterized in that, The incident angles of the first beam and the second beam relative to the wavelength division multiplexing assembly are between 12 and 15 degrees; and / or, The incident angles of the third beam and the fourth beam relative to the wavelength division multiplexing component are between 12 and 15 degrees.

20. An optical communication system, characterized in that, It includes at least two single-fiber bidirectional optical modules as described in any one of claims 1 to 19.

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