A receiving optical module, an optical signal transmission method and system

Abstract

This application provides a receiving optical module, an optical signal transmission method, and a system, relating to the field of optical communication technology. The receiving optical module provided in this solution can decouple the received optical signal through its internal demultiplexing component, achieving demultiplexing that simultaneously considers both mode and wavelength. This ensures that when wavelength division multiplexing (WDM) and mode division multiplexing (MDM) are combined and transmitted through optical fiber, the receiving optical module can demultiplex the optical signal transmitted by the transmitting optical module, reducing the design complexity of the receiving optical module.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, and in particular to a receiving optical module, an optical signal transmission method and system. Background Technology

[0002] In the field of optical communication, with the continuous increase in transmission capacity, the demand for optical module expansion is becoming increasingly urgent. Currently, the main technologies for optical module expansion include wavelength division multiplexing (WDM), higher-order modulation (HEM), and mode division multiplexing (MDD). Among these, WDM and HEM are already commercially available, while MDD is still in the research stage. Currently, some academics have proposed a scheme combining WDM and MDD. However, during the transmission of optical signals through optical fibers, due to bending and disturbances in the fiber, modes of the same order will convert to each other during transmission. For example, Lp11a mode will convert to LP11b mode, making it difficult for the receiving optical module to demultiplex the received optical signal, thus leading to design difficulties for the receiving optical module. Summary of the Invention

[0003] This application provides a receiving optical module, an optical signal transmission method, and a system. When wavelength division multiplexing and mode division multiplexing are combined and optical signals are transmitted through optical fiber, the receiving optical module can simultaneously demultiplex both the mode and wavelength.

[0004] In a first aspect, embodiments of this application provide a receiving optical module, including:

[0005] The demultiplexing component is used to receive a first optical signal through a first optical fiber. The first optical signal includes M optical signals of N wavelengths that are coupled to each other, where N is a positive integer greater than 1 and M is a positive integer greater than N. Among the M optical signals, there are multiple optical signals with the same wavelength but different modes.

[0006] The demultiplexing component is also used to decouple the first optical signal to obtain M optical signals, wherein the decoupling includes wavelength demultiplexing followed by mode demultiplexing, or mode demultiplexing followed by wavelength demultiplexing.

[0007] M receiving optical components are used to receive M optical signals sent by the demultiplexing component, wherein one receiving optical component corresponds to receiving one type of optical signal.

[0008] Therefore, the receiving optical module decouples the received optical signal through the demultiplexing component, achieving demultiplexing that takes into account both mode and wavelength. This ensures that when wavelength division multiplexing and mode division multiplexing are combined and optical signals are transmitted through optical fiber, the receiving optical module can demultiplex the optical signal sent by the transmitting optical module, reducing the design difficulty of the receiving optical module.

[0009] In one possible implementation, the demultiplexing component includes:

[0010] The first wavelength demultiplexing unit is used to demultiplex the first optical signal to obtain N second optical signals. The wavelengths of the different second optical signals are different, and at least one second optical signal includes multiple optical signals with different modes.

[0011] N first demodulation sub-units are used to receive N second optical signals sent by the first demodulation sub-unit, wherein one first demodulation sub-unit receives one second optical signal.

[0012] The first demultiplexing unit is also used to demultiplex the received second optical signal to obtain at least one third optical signal. The M optical signals include at least one third optical signal. When there are multiple third optical signals, the wavelengths of the different optical signals among the multiple third optical signals are the same, but their modes are different. This achieves wavelength demultiplexing followed by mode demultiplexing, thereby obtaining M optical signals.

[0013] In one possible implementation, the demultiplexing component includes:

[0014] A first main waveguide is used to receive and transmit a first optical signal, wherein a first wavelength division multiplexing (WDM) unit is arranged on the first main waveguide;

[0015] N first branch waveguides are used to transmit the second optical signal after wavelength demultiplexing by the first demultiplexing unit. Each first branch waveguide corresponds to the transmission of one second optical signal, and each first branch waveguide is equipped with a first demultiplexing unit.

[0016] In one possible implementation, the first wavelength division unit includes: N first wavelength division sections, each first wavelength division section corresponding to the filtering of an optical signal of one wavelength.

[0017] In one possible implementation, the first wavelength division section includes at least one of a filter and a grating structure.

[0018] In one possible implementation, the demultiplexing component includes:

[0019] The second mode demultiplexing unit is used to demultiplex the first optical signal to obtain multiple fourth optical signals. The different fourth optical signals have different modes, and at least one fourth optical signal includes multiple optical signals with different wavelengths.

[0020] Multiple second demodulation units are used to receive multiple fourth optical signals sent by the second demodulation unit, wherein one second demodulation unit receives one fourth optical signal.

[0021] The second wavelength division unit is also used to demultiplex the received fourth optical signal to obtain at least one fifth optical signal. The M optical signals include at least one fifth optical signal. When there are multiple fifth optical signals, the different optical signals among the multiple fifth optical signals have the same mode order but different wavelengths. This achieves mode demultiplexing followed by wavelength demultiplexing, thereby obtaining M optical signals.

[0022] In one possible implementation, the demultiplexing component includes:

[0023] A second main waveguide is used to receive and transmit the first optical signal, wherein a second demodulation unit is arranged on the second main waveguide;

[0024] Multiple second branch waveguides are used to transmit the fourth optical signal after mode demultiplexing by the second demode division unit. Each second branch waveguide corresponds to the transmission of a fourth optical signal of one order mode, and a second demode division unit is arranged on each second branch waveguide.

[0025] In one possible implementation, the second wavelength division unit includes: a plurality of second wavelength division sections, each second wavelength division section corresponding to the filtering of an optical signal of one wavelength.

[0026] In one possible implementation, the second wavelength division section includes at least one of a filter and a grating structure.

[0027] In one possible implementation, the light-receiving component is a photodetector.

[0028] In one possible implementation, the optical receiving module is located on the system-on-a-chip.

[0029] Secondly, embodiments of this application provide an optical signal transmission system, including: a transmitting optical module and a receiving optical module provided in the first aspect, wherein the transmitting optical module and the receiving optical module are connected via a first optical fiber. In this solution, the transmitting optical module can be used to provide a first optical signal, which includes M optical signals of N wavelengths coupled to each other, where N is a positive integer greater than 1 and M is a positive integer greater than N, wherein the M optical signals include multiple optical signals with the same wavelength but different modes.

[0030] Thirdly, embodiments of this application provide an electronic device including the optical receiving module provided in the first aspect.

[0031] Fourthly, embodiments of this application provide an optical signal transmission method, the method comprising:

[0032] The transmitting optical module transmits a first optical signal through the first optical fiber. The first optical signal is provided by the transmitting optical module. The first optical signal includes M optical signals of N wavelengths that are coupled to each other. N is a positive integer greater than 1, and M is a positive integer greater than N. Among the M optical signals, there are multiple optical signals with the same wavelength but different modes.

[0033] The receiving optical module receives the first optical signal through the first optical fiber;

[0034] The receiving optical module decouples the first optical signal to obtain M optical signals. The decoupling includes either wavelength demultiplexing followed by mode demultiplexing, or mode demultiplexing followed by wavelength demultiplexing.

[0035] Therefore, when wavelength division multiplexing (WDM) and mode division multiplexing (MDD) are combined and optical signals are transmitted through optical fiber, the receiving optical module can decouple the received optical signal through the demultiplexing component, thereby achieving demultiplexing that takes into account both mode and wavelength. This ensures that when WDM and MMD are combined and optical signals are transmitted through optical fiber, the receiving optical module can demultiplex the optical signal sent by the transmitting optical module.

[0036] In one possible implementation, the receiving optical module decouples the first optical signal to obtain M optical signals, specifically including:

[0037] The receiving optical module performs wavelength demultiplexing on the first optical signal to obtain N second optical signals. The wavelengths of the different second optical signals are different, and at least one second optical signal includes multiple optical signals with different modes.

[0038] The receiving optical module performs mode demultiplexing on each second optical signal to obtain M optical signals.

[0039] In one possible implementation, the receiving optical module decouples the first optical signal to obtain M optical signals, specifically including:

[0040] The receiving optical module performs mode demultiplexing on the first optical signal to obtain multiple fourth optical signals. The different fourth optical signals have different modes, and at least one fourth optical signal includes multiple optical signals with different wavelengths.

[0041] The receiving optical module performs wavelength demultiplexing on each fourth optical signal to obtain M optical signals. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of a receiving optical module provided in this application;

[0043] Figure 2 yes Figure 1 A schematic diagram of a demultiplexing component in a receiving optical module;

[0044] Figure 3 yes Figure 2 A schematic diagram of a decomposition and reuse component;

[0045] Figure 4 yes Figure 2 Another structural diagram of the demultiplexing component;

[0046] Figure 5 yes Figure 1 A schematic diagram of a demultiplexing component in a receiving optical module;

[0047] Figure 6 yes Figure 5 A schematic diagram of a decomposition and reuse component;

[0048] Figure 7 yes Figure 5 Another structural diagram of the demultiplexing component;

[0049] Figure 8 This is a system architecture diagram of an optical signal transmission system provided in this application;

[0050] Figure 9 yes Figure 8 A schematic diagram of a transmitting optical module in a medium-light signal transmission system;

[0051] Figure 10 This is a schematic diagram illustrating the relationship between the coupling region length and indirection between the main waveguide and the branch waveguide provided in this application;

[0052] Figure 11 This is a schematic diagram of the structure of an optical signal transmission system provided in this application;

[0053] Figure 12 This is a flowchart illustrating an optical signal transmission method provided in this application. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings.

[0055] Figure 1 This is a schematic diagram of the structure of a receiving optical module provided in this application. Figure 1 As shown, the receiving optical module 100 includes a demultiplexing component 11 and multiple receiving optical components 12. In this scheme, the demultiplexing component 11 can simultaneously perform wavelength and mode demultiplexing functions, that is, the demultiplexing component 11 can demultiplex both wavelengths and modes.

[0056] The demultiplexing component 11 can receive optical signals via optical fiber, which can be single-mode or multimode fiber, without limitation. In this scheme, the optical signals received by the demultiplexing component 11 via the optical fiber can include M optical signals of N wavelengths coupled together, where N is a positive integer greater than 1 and M is a positive integer greater than N. The M optical signals include multiple optical signals with the same wavelength but different modes. For example, the M optical signals can include: an optical signal with wavelength λ1 and a first-order mode, an optical signal with wavelength λ1 and a second-order mode, an optical signal with wavelength λ2 and a first-order mode, an optical signal with wavelength λ2 and a second-order mode, and an optical signal with wavelength λ2 and a third-order mode. In one example, the M optical signals can be transmitted to the receiving optical module 100 via a single optical fiber. In another example, M can also be equal to N, in which case the M optical signals can include multiple optical signals with different wavelengths and the same or different modes. For example, when M = N, the M optical signals may include: an optical signal with wavelength λ1 and mode 1, an optical signal with wavelength λ2 and mode 1, and an optical signal with wavelength λ3 and mode 2; or, the M optical signals may include: an optical signal with wavelength λ1 and mode 1, an optical signal with wavelength λ2 and mode 1, and an optical signal with wavelength λ3 and mode 1.

[0057] In this scheme, the demultiplexing component 11 can decouple the received optical signal to obtain M optical signals. It should be understood that "demultiplexing" mentioned in this scheme can include: wavelength demultiplexing followed by mode demultiplexing of the optical signal, or mode demultiplexing followed by wavelength demultiplexing of the optical signal. In other words, the demultiplexing component 11 can first perform wavelength demultiplexing on the received optical signal, and then perform mode demultiplexing on the optical signal obtained after wavelength demultiplexing to obtain M optical signals; the demultiplexing component 11 can also first perform mode demultiplexing on the received optical signal, and then perform wavelength demultiplexing on the optical signal obtained after mode demultiplexing to obtain M optical signals. In one example, when M = N, the "demultiplexing" mentioned in this scheme can include wavelength demultiplexing of the optical signal. In other words, when M = N, the demultiplexing component 11 can demultiplex the received optical signal by wavelength to obtain M optical signals.

[0058] Furthermore, the demultiplexing component 11 can send the M decoupled optical signals to multiple receiving optical components 12. In this scheme, one receiving optical component 12 can receive one optical signal. For example, the receiving component 12 can be a photodetector. It is understood that the number of receiving optical components 12 in this scheme is also M.

[0059] After all M receiving optical components 12 have received their respective corresponding optical signals, the receiving optical module 100 completes the optical signal reception.

[0060] Therefore, the receiving optical module decouples the received optical signal through the demultiplexing component, achieving demultiplexing that takes into account both mode and wavelength. This ensures that when wavelength division multiplexing and mode division multiplexing are combined and optical signals are transmitted through optical fiber, the receiving optical module can demultiplex the optical signal sent by the transmitting optical module, reducing the design difficulty of the receiving optical module.

[0061] The above is an introduction to the receiving optical module 100 in this scheme. Next, the demultiplexing component 11 in the receiving optical module 100 will be described. For ease of description, the optical signal received by the demultiplexing component 11 will be referred to as the "first optical signal".

[0062] Figure 2 yes Figure 1 A schematic diagram of a demultiplexing component in a receiving optical module. (Example) Figure 2 As shown, the demultiplexing component 11 includes a wavelength demultiplexing unit 111 and N mode demultiplexing units 112. The wavelength demultiplexing unit 111 can demultiplex the first optical signal received by the demultiplexing component 11 to obtain N second optical signals. In this scheme, the wavelengths of the different second optical signals are different, and at least one second optical signal includes multiple optical signals with different modes. For example, one of the second optical signals may include: an optical signal with wavelength λ1 and mode 1, an optical signal with wavelength λ1 and mode 2, and an optical signal with wavelength λ1 and mode 3; another second optical signal may include: an optical signal with wavelength λ2 and mode 1, and an optical signal with wavelength λ2 and mode 2. After the wavelength demultiplexing unit 111 performs wavelength demultiplexing on the first optical signal, it can send the wavelength demultiplexed optical signal to the mode demultiplexing unit 112.

[0063] In this scheme, N demode division units 112 can receive N second optical signals sent by the demode division unit 111, wherein each demode division unit 112 receives one second optical signal. After receiving the second optical signal, the demode division unit 112 can perform mode demultiplexing on the received second optical signal to obtain at least one third optical signal. In this scheme, the M optical signals include at least one third optical signal, wherein when there are multiple third optical signals, the wavelengths of the different optical signals among the multiple third optical signals are the same but their modes are different. For example, if the second optical signal includes an optical signal with a wavelength of λ2 and a mode of 1st order, and an optical signal with a wavelength of λ2 and a mode of 2nd order, then the optical signal obtained by the demode division unit 112 after mode demultiplexing the second optical signal is "an optical signal with a wavelength of λ2 and a mode of 1st order, and an optical signal with a wavelength of λ2 and a mode of 2nd order." At this time, the at least one third optical signal described above is "an optical signal with a wavelength of λ2 and a mode of 1st order, and an optical signal with a wavelength of λ2 and a mode of 2nd order."

[0064] In one example, such as Figure 3 As shown in Figure 4, the demultiplexing component 11 may include: a main waveguide 113 and N branch waveguides 114. The main waveguide 113 can receive and transmit the first optical signal, and may be equipped with... Figure 2 The demultiplexing unit 111 is shown in the diagram. N branch waveguides 114 can transmit the second optical signal after wavelength demultiplexing by the demultiplexing unit 111, wherein one branch waveguide 114 corresponds to transmitting one second optical signal, and one [missing information] can be arranged on one branch waveguide 114. Figure 2 The demodulation unit 112 is shown. In one example, the branch waveguide 114 may include one or more sub-branch waveguides 1141, each of which can transmit an optical signal of one wavelength and one mode. For example, as shown... Figure 3 As shown, one sub-branch waveguide 1141 can transmit optical signals with wavelength λ1 and mode Lp11a / b, while the other sub-branch waveguide 1141 can transmit optical signals with wavelength λ1 and mode Lp01. It should be understood that... Figure 3 and 4 The number of branch waveguides 114 is four in total. This is only an illustrative example and does not constitute a limitation on this scheme. In practical applications, the number of branch waveguides 114 can be greater than four or less than four, and no limitation is made here.

[0065] Continue reading Figure 3 Alternatively, the demultiplexing unit 111 may include N wavelength division sections 1111, each wavelength division section 1111 capable of filtering an optical signal of a specific wavelength. For example, one wavelength division section 1111 may filter an optical signal with wavelength λ1, and another wavelength division section 1111 may filter an optical signal with wavelength λ2. Exemplarily, the wavelength division section 1111 may be a filter, a grating structure, or other components with wavelength demultiplexing functionality; no limitation is made herein. It should be understood that... Figure 3 The wave division section 1111 shown is a filter. Figure 4 The wave division section 1111 shown is a grating structure. In one example, a groove or boss may be formed on the main waveguide 113, wherein the filter or grating structure may be provided with a groove or boss. Exemplarily, the filter or grating structure may be bonded to a groove or boss on the main waveguide 113. In this solution, the filter may be a thin film filter (TFF). It should be understood that... Figure 3 and 4The number of wavelength division units 1111 is four in total. This is only an illustrative example and does not constitute a limitation on this solution. In practical applications, the number of wavelength division units 1111 can be greater than or less than four, and is not limited here. In one example, the number of wavelength division units 1111 can be the same as the number of wavelengths of the optical signal included in the first optical signal.

[0066] The following describes another structure of the demultiplexing component 11 in this scheme.

[0067] Figure 5 yes Figure 1 Another schematic diagram of the demultiplexing component in the receiving optical module. For example... Figure 5 As shown, the demultiplexing component 11 includes a mode demultiplexing unit 115 and multiple wavelength demultiplexing units 116. The mode demultiplexing unit 115 can demultiplex the first optical signal to obtain multiple fourth optical signals. In this scheme, the different fourth optical signals have different modes, and at least one fourth optical signal includes multiple optical signals with different wavelengths. For example, one of the fourth optical signals may include: an optical signal with wavelength λ1 and mode 1, an optical signal with wavelength λ2 and mode 1, and an optical signal with wavelength λ3 and mode 1; another second optical signal may include: an optical signal with wavelength λ1 and mode 2, and an optical signal with wavelength λ2 and mode 2. After the mode demultiplexing unit 115 demultiplexes the first optical signal, it can send the mode-demultiplexed optical signal to the wavelength demultiplexing unit 116.

[0068] In this scheme, the demultiplexing unit 116 can receive multiple fourth optical signals sent by the demode-demultiplexing unit 115, wherein one demode-demultiplexing unit 116 can receive one fourth optical signal. After receiving the fourth optical signal, the demultiplexing unit 116 can perform wavelength demultiplexing on the received fourth optical signal to obtain at least one fifth optical signal. In this scheme, the M optical signals include at least one fifth optical signal. When there are multiple fifth optical signals, the different optical signals among the multiple fifth optical signals have the same mode order but different wavelengths. For example, if the fourth optical signal includes an optical signal with wavelength λ1 and mode 1 and an optical signal with wavelength λ2 and mode 1, then the optical signal obtained by the demultiplexing unit 116 after wavelength demultiplexing the fourth optical signal is "an optical signal with wavelength λ1 and mode 1 and an optical signal with wavelength λ2 and mode 1". In this case, the at least one fifth optical signal described above is "an optical signal with wavelength λ1 and mode 1 and an optical signal with wavelength λ2 and mode 1".

[0069] In one example, such as Figure 6As shown in Figure 7, the demultiplexing component 11 may include a main waveguide 117 and multiple branch waveguides 118. The main waveguide 117 can receive and transmit the first optical signal, and may be equipped with... Figure 5 The demultiplexing unit 115 is shown in the diagram. Multiple branch waveguides 118 can transmit the fourth optical signal after mode demultiplexing by the demultiplexing unit 115. Each branch waveguide 118 corresponds to transmitting a fourth optical signal of one mode. One branch waveguide 118 can be equipped with one... Figure 5 The wavelet deconvolution unit 116 is shown. It should be understood that, Figure 6 and 7 The number of branch waveguides 118 is two in each case. This is only an illustrative example and does not constitute a limitation on this scheme. In practical applications, the number of branch waveguides 118 can be greater than two, and this is not limited here. In one example, the number of branch waveguides 118 can be the same as the number of modes of the optical signal included in the first optical signal.

[0070] Continue reading Figure 6 Alternatively, the demultiplexing unit 116 may include multiple wavelength division sections 1161, each capable of filtering an optical signal of a specific wavelength. For example, one wavelength division section 1161 may filter an optical signal with wavelength λ1, while another wavelength division section 1161 may filter an optical signal with wavelength λ2. Exemplarily, the wavelength division section 1161 may be a filter, a grating structure, or other components with wavelength demultiplexing functionality; no limitation is made herein. It should be understood that... Figure 6 The wave division section 1161 shown is a filter. Figure 7 The wave division section 1161 shown is a grating structure. In one example, a groove or boss may be formed on the branch waveguide 118, wherein the filter or grating structure may be provided with a groove or boss. Exemplarily, the filter or grating structure may be bonded in the groove or boss on the branch waveguide 118. In this solution, the filter may be a thin film filter (TFF). It should be understood that... Figure 6 and 7 The number of wave-splitters 1161 on each branch waveguide is four. This is only an illustrative example and does not constitute a limitation on the present solution. In practical applications, the number of wave-splitters 1161 on each branch waveguide can be greater than or less than four, and is not limited here. In one example, the number of wave-splitters 1161 on each branch waveguide can be consistent with the number of wavelengths of the optical signal included in the first optical signal.

[0071] Understandable Figure 3The M optical signals input to the demultiplexing component 11 in points 4, 6, and 7 are all 8 optical signals, namely: 1. an optical signal with wavelength λ1 and mode Lp01; 2. an optical signal with wavelength λ1 and mode Lp11a / b; 3. an optical signal with wavelength λ2 and mode Lp01; 4. an optical signal with wavelength λ2 and mode Lp11a / b; 5. an optical signal with wavelength λ3 and mode Lp01; 6. an optical signal with wavelength λ3 and mode Lp11a / b; 7. an optical signal with wavelength λ4 and mode Lp01; 8. an optical signal with wavelength λ4 and mode Lp11a / b. It should be understood that... Figure 3 4, 6 and 7 are merely examples and do not constitute a limitation on this scheme.

[0072] The above is an introduction to the receiving optical module provided in this solution. It should be understood that the receiving optical module 100 in this solution can be arranged on a system-on-a-chip (SOC).

[0073] Next, based on the receiving optical module described above, we will introduce an optical signal transmission system provided in this solution.

[0074] Figure 8 This is a system architecture diagram of an optical signal transmission system provided in an embodiment of this application. For example... Figure 8 As shown, the optical signal transmission system includes a transmitting optical module 200 and a receiving optical module 100 as described above. The transmitting optical module 200 and the receiving optical module 100 can be connected via an optical fiber 81. The optical fiber 81 can be a single-mode fiber or a multimode fiber. In this scheme, the transmitting optical module 200 can provide the first optical signal received by the receiving optical module 100.

[0075] In one example, see further. Figure 8The transmitting optical module 200 may include a multiplexing component 21 and N transmitting optical components 22. The N transmitting optical components can provide a first optical signal, that is, the N transmitting optical components can provide the M optical signals described above. In this scheme, one transmitting optical component 22 can provide an optical signal of one wavelength. At least one of the N transmitting optical components 22 can provide multiple optical signals of different modes. For example, one transmitting optical component 22 can provide an optical signal with wavelength λ1 and mode 1, and an optical signal with wavelength λ1 and mode 2. In one example, the N transmitting optical components 22 may all provide an optical signal of one type of mode; it is understood that the modes of the optical signals provided by different transmitting optical components 22 may be the same or different. For example, one emitting optical component 22 can provide an optical signal with a wavelength of λ1 and a first-order mode, while another emitting optical component 22 can provide an optical signal with a wavelength of λ2 and a first-order mode; or, one emitting optical component 22 can provide an optical signal with a wavelength of λ1 and a first-order mode, while another emitting optical component 22 can provide an optical signal with a wavelength of λ2 and a second-order mode.

[0076] The multiplexing component 21 can couple M optical signals provided by N transmitting optical components 22, and then send the coupled optical signals to the receiving optical module 100 via optical fiber 81.

[0077] In one example, such as Figure 9 As shown, the multiplexing component 21 may include M branch waveguides 211 and one main waveguide 212. The M branch waveguides 211 can transmit M optical signals provided by N transmitting optical components 22, where each branch waveguide 211 can transmit one optical signal. In this scheme, the M branch waveguides 211 and the main waveguide 212 can form a waveguide coupling structure, where the optical signals in the branch waveguides 211 can be coupled to the main waveguide 212, and then the coupled M optical signals are transmitted to the receiving optical module 100 via optical fiber 81 through the main waveguide 212. For example, the coupled M optical signals can be understood as M optical signals after wave combining and mode combining. It should be understood that... Figure 9The M optical signals provided are actually 8 optical signals, which are merely illustrative and do not constitute a limitation on this solution. Furthermore, these 8 optical signals are as follows: 1. An optical signal with wavelength λ1 and mode Lp01; 2. An optical signal with wavelength λ1 and mode Lp11a / b; 3. An optical signal with wavelength λ2 and mode Lp01; 4. An optical signal with wavelength λ2 and mode Lp11a / b; 5. An optical signal with wavelength λ3 and mode Lp01; 6. An optical signal with wavelength λ3 and mode Lp11a / b; 7. An optical signal with wavelength λ4 and mode Lp01; 8. An optical signal with wavelength λ4 and mode Lp11a / b.

[0078] Continue reading Figure 9 The optical signals provided by the N emitting optical components 22 can be coupled into the multiplexing component 21 through the collimating and converging lens group 203. In this scheme, the emitting optical components 22 can be lasers.

[0079] In one example, see further. Figure 9 In multiplexing component 21, the length of the coupling region between branch waveguide 211 and main waveguide 212 is related to the spacing between them. For example, as shown... Figure 10 As shown, with a wavelength of 940nm, when the waveguide spacing between the two is 0.7µm and the coupling region length between them is 60µm, the mode coupling efficiency is above 90%; when the waveguide spacing between the two is 0.8µm and the coupling region length between them is 80µm, the mode coupling efficiency is also above 90%.

[0080] It is understandable that the transmitting optical module 200 in this solution can also be arranged on a system-on-a-chip (SOC).

[0081] It is understandable that the receiving optical module in the optical transmission system provided by this solution can decouple the received optical signal through the demultiplexing component, thereby achieving demultiplexing that takes into account both mode and wavelength. This ensures that when wavelength division multiplexing and mode division multiplexing are combined and optical signals are transmitted through optical fiber, the receiving optical module can demultiplex the optical signal sent by the transmitting optical module.

[0082] The above is an introduction to the optical signal transmission system provided in this solution. For ease of understanding, examples are provided below.

[0083] like Figure 11As shown, the bandwidth is 8 * 50 Gbps, with a total of 8 signals, and each signal can transmit a maximum data volume of 50 Gbps. The transmitting optical module 200 can have 4 transmitting optical components, each capable of providing two modes of optical signals: Lp01 and Lp11. The wavelengths of the optical signals provided by the 4 transmitting optical components are: λ1 = 850 nm, λ2 = 880 nm, λ3 = 910 nm, and λ4 = 940 nm.

[0084] The eight optical signals provided by the four transmitting optical components are coupled into a mode-division + wavelength-division multiplexer (i.e., the multiplexing component 21 described above). The coupled eight optical signals can be transmitted to the receiving optical module 100 via G.652d ordinary single-mode fiber.

[0085] After receiving the optical signal transmitted by the transmitting optical module 200, the receiving optical module 100 can decouple the received optical signal using a mode-division + wavelength demultiplexer (i.e., the demultiplexing component 11 described above). Figure 11 The process involves first wavelength demultiplexing and then mode demultiplexing. After decoupling the optical signal using a mode-division + wavelength demultiplexer, eight optical signals are obtained. These eight optical signals are then transmitted to their respective receiving elements (i.e., the receiving optical component 12 described above), thus completing the optical signal transmission.

[0086] Based on the optical signal transmission system provided above, this solution also provides an optical signal transmission method.

[0087] Figure 12 This is an optical signal transmission method provided in an embodiment of this application. For example... Figure 12 As shown, the optical signal transmission method includes the following steps:

[0088] Step S101: The transmitting optical module transmits a first optical signal through the first optical fiber. The first optical signal includes M optical signals of N wavelengths that are coupled to each other, where N is a positive integer greater than 1 and M is a positive integer greater than N. Among the M optical signals, there are multiple optical signals with the same wavelength but different modes.

[0089] In this solution, the first optical signal can be provided by a transmitting optical module. The transmitting optical module can transmit the first optical signal through a first optical fiber. For example, the transmitting optical module can be... Figure 8 The transmitting optical module 200 shown can have a first optical fiber that is Figure 8 The optical fiber 81 shown.

[0090] Step S102: The receiving optical module receives the first optical signal through the first optical fiber.

[0091] In this solution, the receiving optical module can receive the first optical signal through the first optical fiber. For example, the receiving optical module can be... Figure 1 or Figure 8 The optical receiving module 100 shown is illustrated.

[0092] Step S103: The receiving optical module decouples the first optical signal to obtain M optical signals. The decoupling includes wavelength demultiplexing followed by mode demultiplexing, or mode demultiplexing followed by wavelength demultiplexing.

[0093] In this scheme, after the receiving optical module receives the first optical signal, it can decouple the first optical signal to obtain M optical signals. The decoupling can be either wavelength demultiplexing followed by mode demultiplexing, or mode demultiplexing followed by wavelength demultiplexing. In one example, wavelength demultiplexing followed by mode demultiplexing can be understood as first performing wavelength demultiplexing on the received optical signal, and then performing mode demultiplexing on the optical signal obtained after wavelength demultiplexing; mode demultiplexing followed by wavelength demultiplexing can be understood as first performing mode demultiplexing on the received optical signal, and then performing wavelength demultiplexing on the optical signal obtained after mode demultiplexing.

[0094] As one possible implementation, the receiving optical module decouples the first optical signal to obtain M optical signals. Specifically, the receiving optical module can perform wavelength demultiplexing on the first optical signal to obtain N second optical signals, each with a different wavelength. At least one second optical signal includes multiple optical signals with different modes. Then, the receiving optical module performs mode demultiplexing on each second optical signal to obtain M optical signals.

[0095] As another possible implementation, the receiving optical module decouples the first optical signal to obtain M optical signals. Specifically, the receiving optical module can perform mode demultiplexing on the first optical signal to obtain multiple fourth optical signals. The different fourth optical signals have different modes, and at least one fourth optical signal includes multiple optical signals with different wavelengths. Then, the receiving optical module performs wavelength demultiplexing on each fourth optical signal to obtain M optical signals.

[0096] Understandably, the optical transmission method provided by this solution, when combining wavelength division multiplexing (WDM) and mode division multiplexing (MDD) and transmitting optical signals through optical fiber, allows the receiving optical module to decouple the received optical signal through a demultiplexing component. This achieves demultiplexing that simultaneously considers both mode and wavelength, thus ensuring that the receiving optical module can demultiplex the optical signal sent by the transmitting optical module when combining WDM and MMD and transmitting optical signals through optical fiber.

[0097] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0098] It is understood that in the description of the embodiments of this application, words such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of words such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a specific manner.

[0099] In the description of the embodiments in this application, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, B existing alone, and A and B existing simultaneously. Furthermore, unless otherwise stated, the term "multiple" means two or more. For example, multiple systems refer to two or more systems, and multiple terminals refer to two or more terminals.

[0100] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The terms "comprising," "including," "having," and their variations all mean "including but not limited to," unless otherwise specifically emphasized.

[0101] It is understood that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0102] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this invention should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A receiving optical module, characterized in that, include: A demultiplexing component is used to receive a first optical signal through a first optical fiber. The first optical signal includes M optical signals of N wavelengths that are coupled to each other, where N is a positive integer greater than 1 and M is a positive integer greater than N. Among the M optical signals, there are multiple optical signals with the same wavelength but different modes. The demultiplexing component is further configured to decouple the first optical signal to obtain the M optical signals, wherein the decoupling includes wavelength demultiplexing followed by mode demultiplexing, or mode demultiplexing followed by wavelength demultiplexing. The demultiplexing component includes: The first wavelength division unit is used to demultiplex the first optical signal to obtain N second optical signals. The wavelengths of the different second optical signals are different, and at least one of the second optical signals includes multiple optical signals with different modes. N first demodulation sub-units are used to receive N second optical signals sent by the first demodulation sub-units, wherein one first demodulation sub-unit receives one second optical signal; A first main waveguide is used to receive the first optical signal and transmit the first optical signal, wherein the first wavelength division multiplexing unit is arranged on the first main waveguide; N first branch waveguides are used to transmit the second optical signal after wavelength demultiplexing by the first demultiplexing unit, wherein one first branch waveguide corresponds to one second optical signal, and one first demultiplexing unit is arranged on each first branch waveguide; M receiving optical components are used to receive the M optical signals sent by the demultiplexing component, wherein each receiving optical component receives one type of optical signal.

2. The receiving optical module according to claim 1, characterized in that, The first demodulation unit is further configured to: The received second optical signal is demultiplexed to obtain at least one third optical signal. The M optical signals include the at least one third optical signal. When there are multiple third optical signals, the wavelengths of the different optical signals among the multiple third optical signals are the same and the modes are different.

3. The receiving optical module according to claim 1 or 2, characterized in that, The first wavelength division unit includes: N first wavelength division sections, each of which filters an optical signal of one wavelength.

4. The receiving optical module according to claim 3, characterized in that, The first wavelength division section includes at least one of a filter and a grating structure.

5. The receiving optical module according to claim 1, characterized in that, The demultiplexing component includes: The second mode demultiplexing unit is used to perform mode demultiplexing on the first optical signal to obtain multiple fourth optical signals. The different fourth optical signals have different modes, and at least one of the fourth optical signals includes multiple optical signals with different wavelengths. Multiple second demodulation units are used to receive multiple fourth optical signals sent by the second demodulation units, wherein one second demodulation unit receives one fourth optical signal. The second wavelength division unit is further configured to perform wavelength demultiplexing on the received fourth optical signal to obtain at least one fifth optical signal. The M optical signals include the at least one fifth optical signal. When there are multiple fifth optical signals, the different optical signals among the multiple fifth optical signals have the same mode order and different wavelengths.

6. The receiving optical module according to claim 5, characterized in that, The demultiplexing component includes: A second main waveguide is provided for receiving the first optical signal and transmitting the first optical signal, wherein the second main waveguide is provided with the second demodulation unit; Multiple second branch waveguides are used to transmit the fourth optical signal after mode demultiplexing by the second demode division unit, wherein one second branch waveguide corresponds to the transmission of the fourth optical signal of one order mode, and one second demode division unit is arranged on one second branch waveguide.

7. The receiving optical module according to claim 6, characterized in that, The second wavelet decomposition unit includes: a plurality of second wavelet decomposition sections, each second wavelet decomposition section corresponding to filtering an optical signal of one wavelength.

8. The receiving optical module according to claim 7, characterized in that, The second wavelength division section includes at least one of a filter and a grating structure.

9. The receiving optical module according to any one of claims 1-8, characterized in that, The optical receiving component is a photodetector.

10. The receiving optical module according to claim 9, characterized in that, The optical receiving module is mounted on a system-on-a-chip.

11. An optical signal transmission system, characterized in that, include: An optical transmission module is used to provide a first optical signal, which includes M optical signals of N wavelengths coupled to each other, where N is a positive integer greater than 1 and M is a positive integer greater than N. Among the M optical signals, there are multiple optical signals with the same wavelength but different modes. The receiving optical module as described in any one of claims 1-10; The transmitting optical module and the receiving optical module are connected by a first optical fiber.

12. An electronic device, characterized in that, Includes the receiving optical module as described in any one of claims 1-11.

13. A method for transmitting optical signals, characterized in that, The method includes: The transmitting optical module transmits a first optical signal through a first optical fiber. The first optical signal is provided by the transmitting optical module. The first optical signal includes M optical signals of N wavelengths that are coupled to each other, where N is a positive integer greater than 1 and M is a positive integer greater than N. Among the M optical signals, there are multiple optical signals with the same wavelength but different modes. The receiving optical module receives the first optical signal through the first optical fiber; The receiving optical module decouples the first optical signal to obtain the M optical signals. The decoupling includes wavelength demultiplexing followed by mode demultiplexing, or mode demultiplexing followed by wavelength demultiplexing. The receiving optical module includes a first wavelength division multiplexing unit, N first mode division multiplexing units, N first branch waveguides, and M receiving optical components. The first wavelength division unit performs wavelength demultiplexing on the first optical signal to obtain N second optical signals. The wavelengths of the different second optical signals are different, and at least one of the second optical signals includes multiple optical signals with different modes. The N first demodulation sub-units receive N second optical signals sent by the first demodulation sub-unit, wherein one first demodulation sub-unit receives one second optical signal; The N first branch waveguides transmit the second optical signal after wavelength demultiplexing by the first demultiplexing unit, wherein one first branch waveguide corresponds to one second optical signal, and one first demultiplexing unit is arranged on each first branch waveguide; The M optical receiving components receive the M optical signals, wherein each optical receiving component receives one type of optical signal.

14. The method according to claim 13, characterized in that, The receiving optical module decouples the first optical signal to obtain the M optical signals, specifically including: The receiving optical module performs mode demultiplexing on each of the second optical signals to obtain the M optical signals.

15. The method according to claim 13, characterized in that, The receiving optical module decouples the first optical signal to obtain the M optical signals, specifically including: The receiving optical module performs mode demultiplexing on the first optical signal to obtain multiple fourth optical signals. The different fourth optical signals have different modes, and at least one of the fourth optical signals includes multiple optical signals with different wavelengths. The receiving optical module performs wavelength demultiplexing on each of the fourth optical signals to obtain the M optical signals.

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