Dispersion compensation method and device in RoF system based on PON network

Abstract

The application provides a dispersion compensation method and device in a RoF system based on a PON network. The method comprises the following steps: guiding analog optical signals transmitted by multiple remote nodes in an uplink direction to a multi-module dispersion compensation module through an optical switch, wherein the multi-module dispersion compensation module comprises multiple dispersion compensation modules with different compensation amounts; selecting an optimal dispersion compensation module for each analog optical signal based on the wavelength and transmission distance of the analog optical signals of the remote nodes through a dispersion compensation control algorithm; and setting the dispersion compensation module after a splitter or a wavelength division device or before the combination of digital optical signals and analog optical signals, so as to compensate the dispersion of the analog optical signals in a downlink direction. Through the dynamic optical switch and the multi-module dispersion compensation module, dynamic compensation in the uplink direction is realized, and through the combination of centralized compensation and distributed compensation, flexible compensation in the downlink direction is realized.

Description

Technical Field

[0001] This application relates to the technical field of optical communication, and in particular to a dispersion compensation method and apparatus in a RoF system based on a PON network. Background Technology

[0002] Existing dispersion compensation schemes in PON networks and RoF systems can be mainly divided into three categories: electrical dispersion compensation, optical dispersion compensation, and dynamic dispersion compensation. Electrical dispersion compensation schemes convert optical signals into electrical signals and then use technologies such as electronic dispersion compensators (EDCs) or digital signal processing (DSPs) to compensate for the signal. For example, uplink signal compensation can be achieved by adjusting the EDC parameters of the optical network unit (ONU). While this method is effective in certain scenarios, it requires frequent analog-to-digital conversion, leading to signal attenuation and reduced transmission performance, making it unsuitable for dispersion compensation of analog optical signals in RoF systems.

[0003] Optical dispersion compensation schemes typically employ dispersion-compensating fiber (DCF) or chirped fiber grating (CFG) to directly compensate optical signals. This can be achieved by adjusting the chirp characteristics of the optical signal or by combining DCF with single-mode fiber to construct a compensation link. These methods are generally designed for single optical signals or one-to-one compensation scenarios, and are insufficient to meet the complex scenarios in PON networks where uplink and downlink compensation requirements differ. Specifically, the downlink requires addressing the compensation of analog optical signals with the same wavelength but different transmission distances, while the uplink requires addressing the compensation of multiple analog optical signals with different wavelengths, different transmission distances, and adjustable wavelengths.

[0004] Dynamic dispersion compensation schemes achieve dynamic adjustment of the dispersion compensation amount through adjustable compensation modules or optical switching devices, such as using multiple cascaded dispersion compensation modules to switch between different compensation amounts. While these methods offer a degree of flexibility, they mostly target compensation for optical signals of the same wavelength and do not fully consider the needs of multi-wavelength and multi-transmission-distance scenarios, making it difficult to solve the complex dispersion compensation problems in RoF systems. Furthermore, existing dispersion compensation schemes often lack support for mixed optical signals (coexistence of digital and analog optical signals), failing to avoid interference with digital optical signals during the compensation process.

[0005] Therefore, existing technologies cannot fully meet the dispersion compensation requirements of uplink and downlink analog optical signals in RoF systems based on PON networks, especially in complex scenarios with multiple wavelengths, multiple distances, and adjustable wavelengths. Summary of the Invention

[0006] This application aims to at least partially address one of the technical problems in the related art.

[0007] Therefore, the first objective of this application is to propose a dispersion compensation method in a RoF system based on a PON network.

[0008] The second objective of this application is to propose a dispersion compensation device in a RoF system based on a PON network.

[0009] The third objective of this application is to propose an electronic device.

[0010] The fourth objective of this application is to provide a computer-readable storage medium.

[0011] The fifth objective of this application is to provide a computer program product.

[0012] To achieve the above objectives, the first aspect of this application proposes a dispersion compensation method in a RoF system based on a PON network, comprising:

[0013] The analog optical signals sent by multiple remote nodes in the uplink direction are guided to the multi-module dispersion compensation module by an optical switch. The multi-module dispersion compensation module includes multiple dispersion compensation modules with different compensation amounts.

[0014] Based on the wavelength and transmission distance of the simulated optical signal at the remote node, the optimal dispersion compensation module is selected for each simulated optical signal using a dispersion compensation control algorithm.

[0015] Optionally, uplink dispersion compensation is implemented using the following dispersion compensation control algorithm, including:

[0016] Obtain the wavelength set {λ} of the analog optical signal from the remote node in the system. y} y∈{1,…,m} and the set of transmission distances {L y} y∈{1,…,m} ;

[0017] According to each dispersion compensation module {C} in the dispersion compensation module x} x∈{1,…,k} The parameters are used to calculate the compensation effect of each dispersion compensation module on the optical signals of different far-end nodes, forming a dispersion compensation effect matrix {Δτ}. xy} x∈{1,…,k},y∈{1,…,m} , where Δτ xy Represents the x-th dispersion compensation module C x Acting on wavelength λ y The transmission distance is L y Dispersion compensation effect when the optical signal of the far-end node is displayed;

[0018] Based on the dispersion compensation effect matrix, for each far-end node optical signal y∈{1,…,m}, select one that makes |{Δτ xyThe dispersion compensation module is minimized to obtain the dispersion compensation module allocation matrix A;

[0019] According to the allocation scheme in the dispersion compensation module allocation matrix A, the uplink analog optical signal of each remote node is allocated to the selected dispersion compensation module through an optical switch.

[0020] Optional, also includes:

[0021] The system monitors its operational status in real time. If the status of remote nodes in the system changes, the wavelength set and transmission distance set are updated, and the allocation scheme is recalculated.

[0022] To achieve the above objectives, a second aspect of this application proposes a dispersion compensation method in a RoF system based on a PON network, comprising:

[0023] Based on the wavelength and transmission distance of the downlink analog optical signal, a dispersion compensation module is set after the optical splitter or wavelength division multiplexing device, or before the digital optical signal and analog optical signal are combined.

[0024] The dispersion compensation module performs dispersion compensation on the analog optical signal in the downlink direction.

[0025] Optionally, when performing dispersion compensation for the downlink analog optical signal, the dispersion compensation module can be deployed in the following two ways:

[0026] An independent dispersion compensation module is configured in the fiber optic link after the splitter and wavelength division multiplexing device to independently compensate the downlink analog optical signal of each remote node.

[0027] Alternatively, an overall dispersion compensation module can be configured before the digital optical signal and analog optical signal are combined to provide general compensation, and additional dispersion compensation modules can be configured to compensate for nodes that do not meet the compensation requirements.

[0028] Optionally, a general dispersion compensation module is configured before the digital optical signal and analog optical signal are combined to provide general compensation, and additional dispersion compensation modules are configured to compensate for nodes that do not meet the compensation requirements, including:

[0029] Before combining digital and analog optical signals, configure an overall dispersion compensation module c0 to maximize the number of far-end nodes whose absolute value of dispersion broadening Δτ is less than or equal to a preset threshold τ′.

[0030] For far-end nodes where dispersion broadening |Δτ| exceeds a preset threshold τ′, an additional dispersion compensation module c is configured in front of the optical module of the far-end node. y In order to complete the compensation.

[0031] To achieve the above objectives, a third aspect of this application provides a dispersion compensation device in a RoF system based on a PON network, comprising:

[0032] An import module is used to guide the analog optical signals sent by multiple remote nodes in the uplink direction to the dispersion compensation module of the multi-module through an optical switch. The dispersion compensation module of the multi-module includes multiple dispersion compensation modules with different compensation amounts.

[0033] The uplink dispersion dynamic compensation module is used to select the optimal dispersion compensation module for each simulated optical signal based on the wavelength and transmission distance of the simulated optical signal at the remote node through a dispersion compensation control algorithm.

[0034] To achieve the above objectives, a fourth aspect of this application provides a dispersion compensation device in a RoF system based on a PON network, comprising:

[0035] The downlink dispersion compensation deployment module is used to set up the dispersion compensation module after the optical splitter or wavelength division multiplexing device, or before the digital optical signal and the analog optical signal are combined, according to the wavelength and transmission distance of the downlink analog optical signal.

[0036] The downlink dispersion compensation module is used to perform dispersion compensation on the analog optical signal in the downlink direction.

[0037] To achieve the above objectives, a fifth aspect of this application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0038] The memory stores computer-executed instructions;

[0039] The processor executes computer execution instructions stored in the memory to implement the method as described in any one of the first or second aspects.

[0040] To achieve the above objectives, a sixth aspect of this application provides a computer-readable storage medium storing computer-executable instructions that, when executed by a processor, are used to implement the method as described in any one of the first or second aspects.

[0041] To achieve the above objectives, a seventh aspect of this application provides a computer program product that, when executed by a processor, implements the method described in any one of the first or second aspects.

[0042] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0043] This application achieves dynamic compensation in the uplink direction by combining a dynamic optical switch with a multi-module dispersion compensation module. Simultaneously, it achieves flexible compensation in the downlink direction by combining centralized and distributed compensation methods, offering advantages such as high flexibility, strong adaptability, and high compensation accuracy. Furthermore, by employing a combined centralized and distributed compensation scheme in the downlink direction and a dynamically allocated dispersion compensation module in the uplink direction, this application avoids the impact of dispersion compensation on the digital optical signals in the system, effectively ensuring system stability. At the same time, this application improves the compensation capability for multiple analog optical signals with different transmission distances, multiple wavelengths, and tunable wavelengths, meeting the compensation needs of complex scenarios in fiber optic communication systems.

[0044] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0045] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0046] Figure 1 A schematic flowchart illustrating a dispersion compensation method in a RoF system based on a PON network, provided as an embodiment of this application.

[0047] Figure 2 A schematic flowchart illustrating a dispersion compensation method in a RoF system based on a PON network, provided as an embodiment of this application.

[0048] Figure 3 A diagram of a prior art RoF system near-end architecture based on a PON network is provided for embodiments of this application.

[0049] Figure 4 A schematic diagram of the uplink dispersion compensation module provided in an embodiment of this application;

[0050] Figure 5 A schematic diagram of the downlink dispersion compensation process provided in an embodiment of this application;

[0051] Figure 6 A schematic diagram of the dispersion compensation device in a RoF system based on a PON network provided in an embodiment of this application;

[0052] Figure 7 A schematic diagram of the dispersion compensation device in a RoF system based on a PON network provided in an embodiment of this application;

[0053] Figure 8 This is a diagram of an existing RoF system architecture based on a PON network, provided for an embodiment of this application. Detailed Implementation

[0054] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0055] Figure 8 The diagram shows an existing RoF system based on a PON network. This system can simultaneously transmit optical signals (such as broadband signals) from the original PON network and analog optical signals. The optical signals originally transmitted in the PON network typically communicate with remote optical network units (ONUs) via an optical line terminal (OLT) and an optical distribution network (ODN). The analog optical signals are generated by modulation of radio frequency signals using optical modules. The access unit (AU) typically multiplexes relevant fiber optic resources from the ODN in the PON network to communicate with the remote unit (RU), thereby achieving wireless signal relay amplification.

[0056] In the entire system, the original optical signals in the PON network are typically transmitted using digital optical signals. Digital light is less affected by dispersion during transmission compared to analog optical signals. Therefore, this proposal only considers dispersion compensation for analog optical signals in this system to alleviate the broadening problem of optical signals during transmission, thereby improving the transmission distance and efficiency of analog optical signals in the system.

[0057] In dispersion compensation for analog optical signals, if an electrical domain-based dispersion compensation scheme is adopted, the analog optical signal must first be converted into a digital signal. Then, the digital signal is processed using relevant methods of DSP, and finally, the signal is converted back into an analog signal for transmission to the corresponding module in the system. This compensation scheme not only increases the system cost by adding a digital-to-analog converter module, but also increases the number of digital-to-analog conversions, thus increasing signal attenuation.

[0058] Based on the above research background, the dispersion compensation requirements for uplink and downlink transmission of simulated optical signals in a PON-based RoF system are as follows:

[0059] (1) When the analog optical signal in the system is transmitted downlink, the near-end node broadcasts it to all far-end nodes through a single wavelength λ0. At this time, the transmission distances between the far-end nodes and the near-end nodes in the system are different, so the dispersion compensation schemes for different far-end nodes are also different under the same wavelength. That is to say, when the transmission distances of the far-end nodes differ too much, it will be difficult to comprehensively compensate all downlink analog optical signals in the system by simply deploying the same dispersion compensation module (DCF or CFG, etc.).

[0060] In the downlink scenario, this application aims to solve the dispersion compensation problem of multiple analog optical signals with the same wavelength but different transmission distances under the same transmission medium of single-mode fiber.

[0061] (2) The analog optical signal in the system is transmitted in the uplink direction using multi-wavelength wavelength division multiplexing, that is, each remote node uses a different wavelength (λ1~λ2). m The analog optical signal is transmitted to the near-end unit. At this point, the transmission distance and wavelength of the analog optical signal transmitted by different far-end nodes in the optical fiber are different, therefore the required dispersion compensation schemes are also different. In particular, when the wavelength of the uplink analog optical signal in the system adopts a tunable mechanism, the wavelength used by the same far-end node may also be different at different times. Therefore, a fixed dispersion compensation scheme will not be suitable for a wavelength-tunable system.

[0062] In this transmission scenario, the present application aims to solve the dispersion compensation problem of multiple analog optical signals with different transmission distances, different wavelengths, and variable wavelengths under the same transmission medium.

[0063] To address the aforementioned problems, this application provides a dispersion compensation method for a PON-based RoF system, which solves the dispersion compensation problem faced by analog optical signals during uplink and downlink transmission in a PON-based RoF system. Since the dispersion compensation problems faced by analog optical signals during uplink and downlink transmission in a PON-based RoF system are different, this application will address the problem from two different aspects: uplink and downlink of the analog optical signal.

[0064] Figure 1 This is a schematic flowchart illustrating a dispersion compensation method in a RoF system based on a PON network, as provided in an embodiment of this application.

[0065] In the embodiments of this application, Figure 1 The flowchart shown illustrates the detailed process of the dispersion compensation scheme for uplink analog optical signals.

[0066] like Figure 1 As shown, the method includes the following steps:

[0067] Step 101: Guide the analog optical signals sent by multiple remote nodes in the uplink direction to the multi-module dispersion compensation module through an optical switch. The multi-module dispersion compensation module includes multiple dispersion compensation modules with different compensation amounts.

[0068] In such Figure 3 In the near-end architecture diagram of the RoF system based on the PON network shown, the hybrid optical signal (digital optical signal and analog optical signal) transmitted by the remote node is separated into digital optical signal and analog optical signal by a wavelength division multiplexing device through the backbone fiber. The digital optical signal is transmitted to the OLT in the PON network, and the analog optical signal is transmitted to the near-end unit.

[0069] In this system, multiple remotely transmitted analog optical signals exist in the uplink direction, each with different wavelengths and transmission distances. Furthermore, when the remote nodes employ a wavelength-tunable mechanism, the same remote node may use different wavelengths to transmit analog optical signals at different times. In other words, even for the same remote node, the required dispersion compensation scheme varies across different time periods. Therefore, the uplink direction issue that needs to be addressed in this system is the dispersion compensation problem for multiple optical signals with different transmission distances and wavelengths, all with tunable wavelengths, within the optical fiber communication system.

[0070] In response to the above problems, such as Figure 4 As shown, this embodiment of the application introduces an m×k optical switch to input m uplink analog optical signals into a dispersion compensation module, forming a many-to-many dispersion compensation scheme. This dispersion compensation module includes k dispersion compensation modules C1 to C2 with different compensation amounts. k (composed of DCF or CFG), the x-th dispersion compensation module C (where x∈{1,…,k}) x The dispersion compensation amounts for a given analog optical signal (given transmission distance L and transmission wavelength λ) are different for each module. Furthermore, the k dispersion compensation modules in this module have a certain degree of differentiation in their dispersion compensation effects on the analog optical signal in the system, and can cover the dispersion compensation requirements of remote nodes across most wavelength ranges and transmission distances in the system.

[0071] Step 102: Based on the wavelength and transmission distance of the simulated optical signal at the remote node, the optimal dispersion compensation module is selected for each simulated optical signal using a dispersion compensation control algorithm.

[0072] In this embodiment, given a preset k-channel dispersion compensation module, and considering the different dispersion compensation requirements of m remote devices, this application designs a dynamic dispersion compensation control algorithm to select an appropriate dispersion compensation module for each analog optical signal to restore its signal broadening. The algorithm steps are as follows:

[0073] Step 1: Initialization, obtain the wavelength set {λ} of the analog optical signal from the remote node in the system. y} y∈{1,…,m} and the set of transmission distances {L y} y∈{1,…,m} .

[0074] Step 2: Based on the dispersion compensation modules {C} in the dispersion compensation module x} x∈{1,…,k} The parameters are used to calculate the compensation effect of each dispersion compensation module on the optical signals of different far-end nodes, forming a dispersion compensation effect matrix {Δτ}. xy} x∈{1,…,k},y∈{1,…,m} , where Δτ xy Represents the x-th dispersion compensation module C x Acting on wavelength λ y The transmission distance is L y The dispersion compensation effect of the optical signal at the far-end node is specifically manifested as the group delay difference of the simulated optical signal.

[0075] Step 3: Based on the dispersion compensation effect matrix, select the dispersion compensation module with the best compensation effect for each remote node, that is, select the module that makes |{Δτ} the optimal dispersion compensation module for each remote node optical signal y∈{1,…,m}. xy The dispersion compensation module is minimized to obtain the dispersion compensation module allocation matrix A;

[0076] Step 4: According to the allocation scheme in the dispersion compensation module allocation matrix A, the uplink analog optical signal of each remote node is allocated to the selected dispersion compensation module through an optical switch to restore its signal broadening.

[0077] Step 5: Monitor the system's operating status in real time. If the status of remote nodes in the system changes (e.g., a new remote node is added, or the transmission wavelength of a remote node changes), then proceed to Step 1 to update the wavelength set and transmission distance set, and recalculate the allocation scheme.

[0078] Figure 2 This is a schematic flowchart illustrating a dispersion compensation method in a RoF system based on a PON network, as provided in an embodiment of this application.

[0079] In the embodiments of this application, Figure 2 The flowchart shown illustrates the detailed process of the dispersion compensation scheme for downlink analog optical signals.

[0080] like Figure 2 As shown, the method includes the following steps:

[0081] Step 201: Based on the wavelength and transmission distance of the downlink analog optical signal, set a dispersion compensation module after the optical splitter or wavelength division multiplexing device, or before the digital optical signal and analog optical signal are combined.

[0082] Step 202: Perform dispersion compensation on the analog optical signal in the downlink direction using the dispersion compensation module.

[0083] Figure 5 This is a dispersion compensation scenario for downlink signals in a RoF system based on a PON network, as shown in the embodiments of this application.

[0084] Reference Figure 5 In the downlink direction of the optical signal, from the level of the trunk optical cable or distribution optical cable (e.g. Figure 3 From the perspective of node ②, deploying a dispersion compensation unit at this location would require addressing the dispersion compensation problem for multiple mixed optical signals (digital optical signals + analog optical signals) with the same wavelength but different transmission distances. If we consider moving the downlink dispersion compensation module closer to the far-end node, when the dispersion compensation module is moved to... Figure 3 The fiber optic link after the second-stage splitter (i.e.) Figure 3 At node ③ in the middle, dispersion compensation for a single remote node needs to be considered. At this point, only the mixed optical signal from this remote node exists in the downlink direction of the optical fiber. If dispersion compensation is performed on this remote node at this location, it will affect the digital optical signal in the downlink direction that does not require compensation.

[0085] To avoid this impact, this application proposes the following two solutions for the downlink direction of the signal in the system:

[0086] (1) Downlink dispersion compensation scheme one: Configure an independent dispersion compensation module in the optical fiber link after the splitter and wavelength division device to independently compensate the downlink analog optical signal of each remote node.

[0087] Specifically, the dispersion compensation module is moved down to after the beam splitter and wavelength division multiplexing (WDM) device (i.e. Figure 5 At node ④, the downlink optical signal will be separated into an analog optical signal sent to the remote optical module and a digital optical signal sent to the ONU. In this case, the dispersion compensation problem that each remote unit needs to consider is simplified to the dispersion compensation of an analog optical signal with wavelength λ0 and fixed transmission distance in a certain single-mode fiber.

[0088] Suppose that the transmission distance of the remote node y (where y∈{1,…,m}) is L. y The refractive index of a single-mode fiber is n. Combined with the wavelength λ0 of the optical signal, an appropriate dispersion compensation module c can be deployed in front of the remote optical module. y (DCF or CFG, etc.) to restore signal broadening.

[0089] Overall, m dispersion compensation modules c1 to c2 need to be deployed for each of the m remote modules. mThis solution addresses the dispersion compensation issue of analog light in the downlink direction within the system. While capable of accurate dispersion compensation for the analog light in the downlink direction at each remote node, it requires a significant number of dispersion compensation modules.

[0090] (2) Downlink dispersion compensation scheme two: Configure an overall dispersion compensation module before combining digital optical signals and analog optical signals to provide general compensation, and compensate for some nodes that do not meet the compensation requirements through additional dispersion compensation modules.

[0091] Specifically, before the digital optical signal and the analog optical signal are combined (i.e. Figure 5 Deploy an overall dispersion compensation module c0 at node ①.

[0092] The dispersion compensation module c0 needs to be calculated based on the transmission distance of each remote node in the system in order to meet the dispersion compensation requirements of as many remote nodes as possible.

[0093] As one possible implementation, the number of far nodes whose absolute value of dispersion broadening Δτ is less than or equal to a preset threshold τ′ is maximized.

[0094] In other words, by deploying a dispersion compensation module c0 at node ①, the absolute value of the dispersion broadening Δτ of as many remote nodes as possible is less than a preset threshold τ′, i.e., |Δτ|≤τ′. For remote nodes whose dispersion broadening |Δτ| exceeds the preset threshold τ′, an additional dispersion compensation module c0 is installed before their remote node optical module. y In order to complete the compensation.

[0095] Compared to Solution 1, this solution can significantly reduce the number of dispersion compensation modules required while meeting the basic dispersion compensation needs of the system, thus reducing hardware deployment costs, and also taking into account the dispersion compensation accuracy of remote nodes in the system.

[0096] This application embodiment achieves dynamic compensation in the uplink direction by combining a dynamic optical switch with a multi-module dispersion compensation module. Simultaneously, it achieves flexible compensation in the downlink direction by combining centralized and distributed compensation methods, offering advantages such as high flexibility, strong adaptability, and high compensation accuracy. Furthermore, by employing a combined centralized and distributed compensation scheme in the downlink direction and a dynamically allocated dispersion compensation module in the uplink direction, this application avoids the impact of dispersion compensation on the digital optical signals in the system, effectively ensuring system stability. At the same time, this application improves the compensation capability for multiple analog optical signals with different transmission distances, multiple wavelengths, and tunable wavelengths, meeting the compensation needs of complex scenarios in fiber optic communication systems.

[0097] To achieve the above embodiments, this application also proposes a dispersion compensation device in a RoF system based on a PON network. Figure 6 This is a schematic diagram of a dispersion compensation device in a RoF system based on a PON network, provided as an embodiment of this application. Figure 6 As shown, the device includes:

[0098] Import module 100 is used to guide the analog optical signals sent by multiple remote nodes in the uplink direction to the dispersion compensation module of the multi-module through an optical switch. The dispersion compensation module of the multi-module includes multiple dispersion compensation modules with different compensation amounts.

[0099] The uplink dispersion dynamic compensation module 200 is used to select the optimal dispersion compensation module for each simulated optical signal based on the wavelength and transmission distance of the simulated optical signal at the remote node through a dispersion compensation control algorithm.

[0100] To achieve the above embodiments, this application also proposes a dispersion compensation device in a RoF system based on a PON network. Figure 7 This is a schematic diagram of a dispersion compensation device in a RoF system based on a PON network, provided as an embodiment of this application. Figure 7 As shown, the device includes:

[0101] Downlink dispersion compensation deployment module 300 is used to set up a dispersion compensation module after a beam splitter or wavelength division multiplexing device, or before the combination of digital optical signal and analog optical signal, according to the wavelength and transmission distance of the downlink analog optical signal.

[0102] The downlink dispersion compensation module 400 is used to perform dispersion compensation on the analog optical signal in the downlink direction.

[0103] To implement the above embodiments, this application also proposes an electronic device, including: a processor and a memory communicatively connected to the processor; the memory stores computer execution instructions; the processor executes the computer execution instructions stored in the memory to implement the method provided in the foregoing embodiments.

[0104] To implement the above embodiments, this application also proposes a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the methods provided in the foregoing embodiments.

[0105] To implement the above embodiments, this application also proposes a computer program product, including a computer program that, when executed by a processor, implements the methods provided in the foregoing embodiments.

[0106] The collection, storage, use, processing, transmission, provision, and disclosure of user personal information involved in this application all comply with the provisions of relevant laws and regulations and do not violate public order and good morals.

[0107] It should be noted that personal information collected from users should be used for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. Furthermore, such collection / sharing should only be conducted after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign an agreement / authorization that includes authorization of relevant user information before the user uses the function. In addition, any necessary steps must be taken to protect and safeguard access to such personal information data and ensure that others with access to personal information data comply with their privacy policies and procedures.

[0108] This application is intended to provide an implementation scheme for users to selectively prevent the use or access to their personal information data. Specifically, this disclosure is intended to provide hardware and / or software to prevent or block access to such personal information data. Once personal information data is no longer needed, risks can be minimized by restricting data collection and deleting data. Furthermore, where applicable, such personal information is de-identified to protect user privacy.

[0109] In the foregoing descriptions of the embodiments, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0110] 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 number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0111] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0112] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0113] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0114] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0115] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0116] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

[0117] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this application can be achieved, and this is not limited herein.

[0118] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A dispersion compensation method in a RoF system based on a PON network, characterized in that, Includes the following steps: The analog optical signals sent by multiple remote nodes in the uplink direction are guided to the multi-module dispersion compensation module by an optical switch. The multi-module dispersion compensation module includes multiple dispersion compensation modules with different compensation amounts. Based on the wavelength and transmission distance of the simulated optical signal at the remote node, the optimal dispersion compensation module is selected for each simulated optical signal through a dispersion compensation control algorithm. Upward dispersion compensation is achieved through the following dispersion compensation control algorithm, including: Obtain the wavelength set of analog optical signals from remote nodes in the system. and transmission distance set ; According to each dispersion compensation module in the dispersion compensation module The parameters are used to calculate the compensation effect of each dispersion compensation module on the optical signals of different far-end nodes, forming a dispersion compensation effect matrix. ,in, Indicates the first Individual dispersion compensation module Acting on wavelength Transmission distance is The dispersion compensation effect of the optical signal at the far-end node, where m is the m-channel analog optical signal; K is the k-channel dispersion compensation module with different compensation amounts; , This represents the wavelength and transmission distance of the y-th analog optical signal; Based on the dispersion compensation effect matrix, the optical signal of each far-end node is... Choose to make Minimize the dispersion compensation module to obtain the dispersion compensation module allocation matrix. ; The matrix is ​​allocated according to the dispersion compensation module. The allocation scheme uses optical switches to distribute the uplink analog optical signals of each remote node to the selected dispersion compensation module.

2. The method according to claim 1, characterized in that, Also includes: The system monitors its operational status in real time. If the status of remote nodes in the system changes, the wavelength set and transmission distance set are updated, and the allocation scheme is recalculated.

3. A dispersion compensation method in a RoF system based on a PON network, characterized in that, Includes the following steps: Based on the wavelength and transmission distance of the downlink analog optical signal, a dispersion compensation module is set before the digital and analog optical signals are combined. The deployment of the dispersion compensation module includes configuring a general dispersion compensation module before the digital and analog optical signals are combined to provide general compensation, and providing additional dispersion compensation modules for nodes that do not meet the compensation requirements. This includes: Configure an overall dispersion compensation module before combining the digital and analog optical signals. This broadens the dispersion. The absolute value is less than or equal to the preset threshold. The number of remote nodes is the largest; For dispersion broadening Exceeding the preset threshold For remote nodes, additional dispersion compensation modules are configured in front of their remote optical modules. In order to complete the compensation; The dispersion compensation module performs dispersion compensation on the analog optical signal in the downlink direction.

4. The method according to claim 3, characterized in that, When performing dispersion compensation for downlink analog optical signals, the deployment of the dispersion compensation module further includes: An independent dispersion compensation module is configured in the fiber optic link after the splitter and wavelength division multiplexing device to independently compensate the downlink analog optical signal of each remote node.

5. A dispersion compensation device in a RoF system based on a PON network, characterized in that, Includes the following modules: An import module is used to guide the analog optical signals sent by multiple remote nodes in the uplink direction to the dispersion compensation module of the multi-module through an optical switch. The dispersion compensation module of the multi-module includes multiple dispersion compensation modules with different compensation amounts. The uplink dispersion dynamic compensation module is used to select the optimal dispersion compensation module for each simulated optical signal based on the wavelength and transmission distance of the simulated optical signal at the remote node through a dispersion compensation control algorithm. The uplink dispersion dynamic compensation module is also used to obtain the wavelength set of the analog optical signal from the remote node in the system. and transmission distance set ; According to each dispersion compensation module in the dispersion compensation module The parameters are used to calculate the compensation effect of each dispersion compensation module on the optical signals of different far-end nodes, forming a dispersion compensation effect matrix. ,in, Indicates the first Individual dispersion compensation module Acting on wavelength Transmission distance is The dispersion compensation effect of the optical signal at the far-end node, where m is the m-channel analog optical signal; K is the k-channel dispersion compensation module with different compensation amounts; , This represents the wavelength and transmission distance of the y-th analog optical signal; Based on the dispersion compensation effect matrix, the optical signal of each far-end node is... Choose to make Minimize the dispersion compensation module to obtain the dispersion compensation module allocation matrix. ; The matrix is ​​allocated according to the dispersion compensation module. The allocation scheme uses optical switches to distribute the uplink analog optical signals of each remote node to the selected dispersion compensation module.

6. A dispersion compensation device in a RoF system based on a PON network, characterized in that, Includes the following modules: The downlink dispersion compensation deployment module is used to set up the dispersion compensation module before the digital optical signal and the analog optical signal are combined, based on the wavelength and transmission distance of the downlink analog optical signal. Downward dispersion compensation module, used to perform dispersion compensation on analog optical signals in the downward direction through the dispersion compensation module; The downlink dispersion compensation deployment module is also used to configure an overall dispersion compensation module before the digital optical signal and analog optical signal are combined, providing general compensation, and to compensate for some nodes that do not meet the compensation requirements through additionally configured dispersion compensation modules; wherein, it includes: Configure an overall dispersion compensation module before combining the digital and analog optical signals. This broadens the dispersion. The absolute value is less than or equal to the preset threshold. The number of remote nodes is the largest; For dispersion broadening Exceeding the preset threshold For remote nodes, additional dispersion compensation modules are configured in front of their remote optical modules. In order to complete the compensation.

7. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method as described in any one of claims 1-2 or 3-4.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-2 or 3-4.

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