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

Abstract

The invention provides a dispersion compensation method and device in an RoF system based on a PON (Passive Optical Network), and the method comprises the steps: guiding analog optical signals transmitted by multiple paths of remote nodes in an uplink direction into a multi-module dispersion compensation module through an optical switch, the multi-module dispersion compensation module comprises a plurality of dispersion compensation modules with different compensation amounts; selecting an optimal dispersion compensation module for each path of analog optical signals through a dispersion compensation control algorithm based on the wavelength and the transmission distance of the analog optical signals of the far-end node; according to the wavelength and the transmission distance of the analog optical signal in the downlink direction, a dispersion compensation module is arranged behind the optical splitter or the wavelength division device or before the digital optical signal and the analog optical signal are combined, and dispersion compensation is carried out on the analog optical signal in the downlink direction. The dynamic optical switch is combined with the multi-module dispersion compensation module, dynamic compensation in the uplink direction is achieved, and meanwhile flexible compensation in the downlink direction is achieved in the mode that centralized compensation and distributed compensation are combined.

Description

Technical Field

[0001] The present application relates to the technical field of optical communications, and in particular to a dispersion compensation method and device in a RoF system based on a PON network. Background Art

[0002] The existing dispersion compensation solutions in PON networks and RoF systems can be mainly divided into three categories: electrical domain dispersion compensation, optical domain dispersion compensation, and dynamic dispersion compensation. The electrical domain dispersion compensation solution converts optical signals into electrical signals, and then uses electronic dispersion compensators (EDC) or digital signal processing (DSP) and other technologies to compensate the signals. For example, the compensation of upstream signals is achieved by adjusting the EDC parameters of the optical network unit (ONU). Although this type of method is effective in some scenarios, it requires frequent digital-to-analog conversion, which leads to signal attenuation and reduced transmission effect, and is not suitable for dispersion compensation of analog optical signals in RoF systems.

[0003] Optical domain dispersion compensation solutions usually use dispersion compensating fiber (DCF) or chirped fiber grating (CFG) to directly compensate optical signals, for example, by adjusting the chirp characteristics of the optical signal or using a combination of DCF and single-mode fiber to build a compensation link. This type of method is usually aimed at a single optical signal or a one-to-one compensation scenario, and it is difficult to meet the complex scenarios with different compensation requirements for the upstream and downstream directions in the PON network. Specifically, the downstream direction needs to solve the compensation problem of analog optical signals with the same wavelength and different transmission distances, while the upstream direction needs to solve the compensation problem of multiple analog optical signals with different wavelengths, different transmission distances and adjustable wavelengths.

[0004] Dynamic dispersion compensation solutions use adjustable compensation modules or optical switch devices to dynamically adjust the dispersion compensation amount, such as using multiple cascaded dispersion compensation modules to switch different compensation amounts. Although such methods have certain flexibility, most of them are aimed at compensating 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 problem in the RoF system. In addition, existing dispersion compensation solutions often lack support for mixed optical signals (coexistence of digital optical signals and analog optical signals), and fail to avoid interference with digital optical signals during the compensation process.

[0005] Therefore, the existing technology cannot fully meet the dispersion compensation requirements of upstream and downstream analog optical signals in the RoF system based on the PON network, especially in complex scenarios with multiple wavelengths, multiple distances and adjustable wavelengths. Summary of the invention

[0006] The present application aims to solve one of the technical problems in the related art at least to some extent.

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

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

[0009] The third objective of the present application is to provide an electronic device.

[0010] A fourth objective of the present application is to provide a computer-readable storage medium.

[0011] A fifth object of the present application is to provide a computer program product.

[0012] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a dispersion compensation method in a RoF system based on a PON network, including:

[0013] Directing analog optical signals sent by multiple remote nodes in the uplink direction to a multi-module dispersion compensation module through an optical switch, wherein the multi-module dispersion compensation module includes a plurality of dispersion compensation modules with different compensation amounts;

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

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

[0016] Get the wavelength set {λ of the analog optical signal of the remote node in the system y} y∈{1,…,m} And the transmission distance set {L y} y∈{1,…,m} ;

[0017] According to the dispersion compensation modules in the dispersion compensation module {C x} x∈{1,…,k} The parameters of the dispersion compensation module are used to calculate the compensation effect of each dispersion compensation module on the optical signals of different remote nodes, and the dispersion compensation effect matrix {Δτ xy} x∈{1,…,k},y∈{1,…,m} , where Δτ xy Indicates the xth dispersion compensation module C x Acting on a wavelength of λ y , the transmission distance is L y Dispersion compensation effect of remote node optical signal;

[0018] Based on the dispersion compensation effect matrix, for each remote node optical signal y∈{1,…,m}, select |{Δτ xy}|Minimized dispersion compensation module, 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 the optical switch.

[0020] Optionally, also include:

[0021] Monitor the system operation status in real time. If the relevant status of the remote node in the system changes, update the wavelength set and transmission distance set, and recalculate the allocation plan.

[0022] To achieve the above-mentioned purpose, the second aspect of the present application proposes a dispersion compensation method in a RoF system based on a PON network, including:

[0023] According to the wavelength and transmission distance of the analog optical signal in the downstream direction, a dispersion compensation module is arranged after the optical splitter or wavelength division device, or before the digital optical signal is combined with the analog optical signal;

[0024] The dispersion compensation module is used to perform dispersion compensation on the analog optical signal in the downlink direction.

[0025] Optionally, when performing dispersion compensation for analog optical signals in the downlink direction, deployment of the dispersion compensation module includes the following two methods:

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

[0027] Alternatively, an overall dispersion compensation module is configured before the digital optical signal is combined with the analog optical signal to provide universal compensation, and some nodes that do not meet the compensation requirements are compensated through additionally configured dispersion compensation modules.

[0028] Optionally, configuring an overall dispersion compensation module before combining the digital optical signal with the analog optical signal to provide universal compensation, and compensating some nodes that do not meet the compensation requirements through an additionally configured dispersion compensation module, includes:

[0029] Before the digital optical signal is combined with the analog optical signal, an overall dispersion compensation module c0 is configured to maximize the number of remote nodes whose absolute value of dispersion broadening Δτ is less than or equal to a preset threshold τ′;

[0030] For remote nodes whose dispersion broadening |Δτ| exceeds the preset threshold τ′, a corresponding dispersion compensation module c is additionally configured in front of the remote node optical module. y , to complete the compensation.

[0031] To achieve the above-mentioned purpose, the third aspect of the present application proposes a dispersion compensation device in a RoF system based on a PON network, including:

[0032] An import module is used to guide the analog optical signals sent by the multi-path remote nodes in the uplink direction to the multi-module dispersion compensation module through the optical switch, wherein the multi-module dispersion compensation module includes a plurality of dispersion compensation modules with different compensation amounts;

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

[0034] To achieve the above-mentioned purpose, the fourth aspect of the present application proposes a dispersion compensation device in a RoF system based on a PON network, including:

[0035] A dispersion compensation deployment module in the downstream direction is used to set a dispersion compensation module after the optical splitter or wavelength division device, or before the digital optical signal is combined with the analog optical signal, according to the wavelength and transmission distance of the analog optical signal in the downstream direction;

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

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

[0038] The memory stores computer-executable instructions;

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

[0040] To achieve the above-mentioned purpose, the sixth aspect embodiment of the present application proposes a computer-readable storage medium, in which computer execution instructions are stored. When the computer execution instructions are executed by a processor, they are used to implement the method as described in any one of the first aspect or the second aspect.

[0041] To achieve the above-mentioned purpose, the seventh aspect of the present application proposes a computer program product, which, when executed by a processor, implements the method described in any one of the first aspect or the second aspect.

[0042] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0043] The present application realizes dynamic compensation in the uplink direction by combining a dynamic optical switch with a multi-module dispersion compensation module, and realizes flexible compensation in the downlink direction by combining centralized and distributed compensation, which has the advantages of high flexibility, strong adaptability and high compensation accuracy; and, the present application avoids the influence of dispersion compensation on the digital optical signal in the system by adopting a combination of centralized and distributed compensation in the downlink direction and a method of dynamically allocating dispersion compensation modules in the uplink direction, thereby effectively ensuring the stability of the system; at the same time, the present application improves the compensation capability for multiple analog optical signals with different transmission distances, multiple wavelengths and tunable wavelengths, meeting the compensation requirements of complex scenarios in optical fiber communication systems.

[0044] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0046] Figure 1 A flow chart of a dispersion compensation method in a RoF system based on a PON network provided in an embodiment of the present application;

[0047] Figure 2 A flow chart of a dispersion compensation method in a RoF system based on a PON network provided in an embodiment of the present application;

[0048] Figure 3 A diagram of the proximal architecture of an existing RoF system based on a PON network provided in an embodiment of the present application;

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

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

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

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

[0053] Figure 8 An existing PON network-based RoF system architecture diagram provided in an embodiment of the present application. DETAILED DESCRIPTION

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

[0055] Figure 8 The figure shows an existing RoF system based on a PON network, which can simultaneously transmit optical signals (such as home broadband signals, etc.) and analog optical signals in the original PON network. Among them, the optical signals originally transmitted in the PON network usually communicate with the optical network unit (ONU) at the remote end via the optical line terminal (OLT) and the optical distribution network (ODN). The analog optical signal is a radio frequency signal modulated by an optical module. The near-end unit (AU) usually multiplexes the ODN and other related optical fiber resources in the PON network to communicate with the remote unit (RU), thereby realizing the relay amplification of the wireless signal.

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

[0057] In the dispersion compensation for analog optical signals, if the dispersion compensation solution based on the electrical domain is adopted, the analog optical signal needs to be converted into a digital signal first, and then the signal is processed using the relevant methods of DSP on the digital signal, and then the signal is converted into an analog signal and transmitted to the corresponding module in the system. This compensation solution not only requires adding a digital-to-analog conversion module to the system, which increases the system cost, but also requires increasing the number of digital-to-analog conversions of the signal, which increases the signal attenuation.

[0058] Based on the above research background, the dispersion compensation requirements for upstream and downstream transmission of analog optical signals in the RoF system based on the PON network are as follows:

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

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

[0061] (2) The analog optical signals in the system are transmitted in the upstream direction using multi-wavelength wavelength division multiplexing, that is, each remote node uses a different wavelength (λ1~λ m ) transmits the analog optical signal to the near-end unit. At this time, the transmission distance and wavelength of the analog optical signals transmitted by different remote nodes in the optical fiber are different, so 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 adopted by the same remote node at different times may also be different. Therefore, a fixed dispersion compensation scheme will not be applicable to a system with tunable wavelength.

[0062] In this transmission scenario, the present application needs 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] In view of the above problems, the embodiment of the present application provides a dispersion compensation method in a RoF system based on a PON network, which is used to solve the dispersion compensation problem faced by analog optical signals in the RoF system based on the PON network during uplink and downlink transmission. Since the dispersion compensation problems faced by analog optical signals in the RoF system based on the PON network during uplink and downlink transmission are different, the present application will solve them from two different aspects, the uplink and downlink of the analog optical signal.

[0064] Figure 1 A schematic flow chart of a dispersion compensation method in a RoF system based on a PON network provided in an embodiment of the present application.

[0065] In the embodiment of the present application, Figure 1 The flowchart shown is a detailed process of the dispersion compensation solution for the uplink analog optical signal.

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

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

[0068] In such Figure 3 In the proximal architecture diagram of the RoF system based on the PON network shown, the mixed optical signal (digital optical signal and analog optical signal) transmitted by the remote node is separated into a digital optical signal and an analog optical signal through a wavelength division device through the trunk optical fiber, wherein the digital optical signal is transmitted to the OLT in the PON network, and the analog optical signal is transmitted to the proximal unit.

[0069] In the uplink direction of the analog optical signal in this system, there are multiple analog optical signals sent from remote ends, and the wavelengths and transmission distances of these analog optical signals are different. In addition, when the remote nodes in the system adopt a wavelength tunable mechanism, the optical wavelengths used by the same remote node to transmit analog optical signals at different times may also be different. In other words, even for the same remote node, the dispersion compensation scheme required in different time periods is variable. Therefore, what needs to be solved in the uplink direction of this system is the dispersion compensation problem of multiple optical signals with different transmission distances, multiple wavelengths and tunable wavelengths in the optical fiber communication system.

[0070] In response to the above problems, Figure 4 As shown, the embodiment of the present application introduces an m×k optical switch to import m analog optical signals in the uplink direction into a dispersion compensation module, thereby forming a many-to-many dispersion compensation solution. The dispersion compensation module includes k dispersion compensation modules C1 to C2 with different compensation amounts. k (composed of DCF or CFG), the xth (where x∈{1,…,k}) dispersion compensation module C x The dispersion compensation amount for a given analog optical signal (given transmission distance L, transmission wavelength λ) is different. At the same time, the k dispersion compensation modules in the module have a certain degree of differentiation in the dispersion compensation effect of the analog optical signal in the system, which can cover the dispersion compensation requirements of remote nodes in most wavelength ranges and transmission distances in the system.

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

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

[0073] Step 1: Initialize and obtain the wavelength set {λ y} y∈{1,…,m} And the transmission distance set {L y} y∈{1,…,m} .

[0074] Step 2: According to the dispersion compensation modules in the dispersion compensation module, x} x∈{1,…,k} The parameters of the dispersion compensation module are used to calculate the compensation effect of each dispersion compensation module on the optical signals of different remote nodes, and the dispersion compensation effect matrix {Δτ xy} x∈{1,…,k},y∈{1,…,m} , where Δτ xy Indicates the xth dispersion compensation module C x Acting on a wavelength of λ y , the transmission distance is L y The dispersion compensation effect of the remote node optical signal 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 dispersion compensation module with the best compensation effect for each remote node optical signal y∈{1,…,m} to make its |{Δτ xy}|Minimized dispersion compensation module, 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 the optical switch to restore its signal broadening.

[0077] Step 5: Monitor the system operation status in real time. If the relevant status of the remote nodes in the system changes (such as a new remote node is added, or the transmission wavelength of a remote node is changed), go to step 1, update the wavelength set and transmission distance set, and recalculate the allocation plan.

[0078] Figure 2 A schematic flow chart of a dispersion compensation method in a RoF system based on a PON network provided in an embodiment of the present application.

[0079] In the embodiment of the present application, Figure 2 The flowchart shown is a detailed process of the dispersion compensation solution for the downlink analog optical signal.

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

[0081] Step 201, according to the wavelength and transmission distance of the analog optical signal in the downlink direction, a dispersion compensation module is set after the optical splitter or wavelength division device, or before the digital optical signal and the analog optical signal are combined;

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

[0083] Figure 5 This is a dispersion compensation scenario of a downlink signal in a RoF system based on a PON network as shown in an embodiment of the present application.

[0084] Reference Figure 5 , in the downstream direction of the optical signal, from the level of the trunk optical cable or distribution optical cable (such as Figure 3 If the dispersion compensation unit is deployed here, it is necessary to solve the dispersion compensation problem of multiple mixed optical signals (digital optical signal + analog optical signal) with the same wavelength and different transmission distances. If the dispersion compensation module in the downlink direction is considered to be sunk to a place close to the remote node, when the dispersion compensation module is sunk to Figure 3 The optical fiber link after the secondary optical splitter (i.e. Figure 3 When the dispersion compensation is performed at the middle node (at node ③), the dispersion compensation of a single remote node needs to be considered. At this time, there is only the mixed optical signal of the remote node in the downstream direction of the optical fiber. If the dispersion compensation is performed for the remote node here, it will affect the digital optical signal in the downstream direction that does not need to be compensated.

[0085] In order to avoid this effect, this application proposes the following two solutions for the downlink direction of the signal in the system:

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

[0087] Specifically, the dispersion compensation module is sunk behind the optical splitter and wavelength division device (i.e. Figure 5 At the middle node ④), the downlink optical signal will be separated into the analog optical signal sent to the remote optical module and the 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 the analog optical signal with a wavelength of λ0 and a fixed transmission distance in a certain single-mode optical fiber.

[0088] Assume that the transmission distance of the remote node y (where y∈{1,…,m}) is L y The refractive index of the 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.), thereby restoring the signal broadening.

[0089] In general, m dispersion compensation modules c1 to c1 need to be deployed for m remote modules respectively. m, in order to solve the dispersion compensation problem of the analog light in the downlink direction of the system. This solution can accurately compensate the analog light in the downlink direction of each remote node, but it requires more dispersion compensation modules.

[0090] (2) Downlink dispersion compensation solution 2: A general dispersion compensation module is configured before the digital optical signal is combined with the analog optical signal to provide universal compensation. The nodes that do not meet the compensation requirements are compensated by additionally configured dispersion compensation modules.

[0091] Specifically, before the digital optical signal is combined with the analog optical signal (i.e. Figure 5 An overall dispersion compensation module c0 is deployed at the middle node ①.

[0092] The dispersion compensation module c0 needs to perform calculations according to the transmission distances of the various remote nodes of the system, so as to satisfy the dispersion compensation requirements of as many remote nodes as possible.

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

[0094] That is to say, by deploying the dispersion compensation module c0 at node ①, the absolute value of the dispersion broadening Δτ of as many remote nodes as possible is made smaller than a preset threshold τ′, that is, |Δτ|≤τ′. For remote nodes whose dispersion broadening |Δτ| exceeds the preset threshold τ′, an additional corresponding dispersion compensation module c0 is installed in front of the optical module of the remote node. y , to complete the compensation.

[0095] Compared with Solution 1, this solution can greatly reduce the number of required dispersion compensation modules while meeting the basic dispersion compensation requirements of the system, reducing the hardware deployment cost while taking into account the dispersion compensation accuracy of remote nodes in the system.

[0096] The embodiment of the present application realizes dynamic compensation in the uplink direction by combining a dynamic optical switch with a multi-module dispersion compensation module, and realizes flexible compensation in the downlink direction by combining centralized and distributed compensation, and has the advantages of high flexibility, strong adaptability and high compensation accuracy; and, the present application avoids the influence of dispersion compensation on the digital optical signal in the system by adopting a solution combining centralized and distributed compensation in the downlink direction and a method of dynamically allocating dispersion compensation modules in the uplink direction, and effectively ensures the stability of the system; at the same time, the present application improves the compensation capability for multiple analog optical signals with different transmission distances, multiple wavelengths and tunable wavelengths, and meets the compensation requirements of complex scenarios in optical fiber communication systems.

[0097] In order to implement the above embodiment, the present application also proposes a dispersion compensation device in a RoF system based on a PON network. Figure 6 The present invention provides a schematic diagram of a dispersion compensation device in a RoF system based on a PON network. Figure 6 As shown, the device comprises:

[0098] The introduction module 100 is used to guide the analog optical signals sent by the multi-path remote nodes in the uplink direction to the multi-module dispersion compensation module through the optical switch, wherein the multi-module dispersion compensation module includes a plurality of dispersion compensation modules with different compensation amounts;

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

[0100] In order to implement the above embodiment, the present application also proposes a dispersion compensation device in a RoF system based on a PON network. Figure 7 The present invention provides a schematic diagram of a dispersion compensation device in a RoF system based on a PON network. Figure 7 As shown, the device comprises:

[0101] A downstream dispersion compensation deployment module 300 is used to set a dispersion compensation module after an optical splitter or a wavelength division device, or before combining a digital optical signal with an analog optical signal, according to the wavelength and transmission distance of the downstream analog optical signal;

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

[0103] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided by the above embodiments.

[0104] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0105] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

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

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

[0108] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0109] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0110] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0111] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0112] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0113] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0114] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0115] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0116] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

[0117] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution of this application can be achieved, and this document is not limited here.

[0118] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art 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 in the protection scope of this application.

Claims

1. A dispersion compensation method in a RoF system based on a PON network, characterized in that: The following steps are involved: Directing analog optical signals sent by multiple remote nodes in the uplink direction to a multi-module dispersion compensation module through an optical switch, wherein the multi-module dispersion compensation module includes a plurality of dispersion compensation modules with different compensation amounts; Based on the wavelength and transmission distance of the analog optical signal at the remote node, the optimal dispersion compensation module is selected for each analog optical signal through the dispersion compensation control algorithm.

2. The method according to claim 1, characterized in that Dispersion compensation in the uplink direction is achieved through the following dispersion compensation control algorithms, including: Get the wavelength set {λ of the analog optical signal of the remote node in the system y } y∈{1，...，m} And the transmission distance set {L y } y∈{1，...，m} ; According to the dispersion compensation modules in the dispersion compensation module {C x } x∈{1，...，k} The parameters of the dispersion compensation module are used to calculate the compensation effect of each dispersion compensation module on the optical signals of different remote nodes, and the dispersion compensation effect matrix {Δτ xy } x∈{1，...，k}，y∈{1，...，m} , where Δτ xy Indicates the xth dispersion compensation module C x Acting on a wavelength of λ y , the transmission distance is L y Dispersion compensation effect of remote node optical signal; Based on the dispersion compensation effect matrix, for each remote node optical signal y∈{1, ..., m}, select |{Δτ xy }|Minimized dispersion compensation module, obtain the dispersion compensation module allocation matrix A; 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 the optical switch.

3. The method according to claim 2, characterized in that Also includes: Monitor the system operation status in real time. If the relevant status of the remote node in the system changes, update the wavelength set and transmission distance set, and recalculate the allocation plan.

4. A dispersion compensation method in a RoF system based on a PON network, characterized in that: The following steps are involved: According to the wavelength and transmission distance of the analog optical signal in the downstream direction, a dispersion compensation module is arranged after the optical splitter or wavelength division device, or before the digital optical signal is combined with the analog optical signal; The dispersion compensation module is used to perform dispersion compensation on the analog optical signal in the downlink direction.

5. The method according to claim 4, characterized in that When performing dispersion compensation for analog optical signals in the downlink direction, the deployment of the dispersion compensation module includes the following two methods: An independent dispersion compensation module is configured in the optical fiber link after the optical splitter and wavelength division device to independently compensate the analog optical signal in the downlink direction of each remote node; Alternatively, an overall dispersion compensation module is configured before the digital optical signal is combined with the analog optical signal to provide universal compensation, and some nodes that do not meet the compensation requirements are compensated through additionally configured dispersion compensation modules.

6. The method according to claim 5, characterized in that The method configures an overall dispersion compensation module before combining the digital optical signal and the analog optical signal to provide general compensation, and compensates some nodes that do not meet the compensation requirements through an additionally configured dispersion compensation module, including: Before the digital optical signal is combined with the analog optical signal, an overall dispersion compensation module c0 is configured to maximize the number of remote nodes whose absolute value of dispersion broadening Δτ is less than or equal to a preset threshold τ′; For remote nodes whose dispersion broadening |Δτ| exceeds the preset threshold τ′, a corresponding dispersion compensation module c is additionally configured in front of the remote node optical module. y , to complete the compensation.

7. 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 the multi-path remote nodes in the uplink direction to the multi-module dispersion compensation module through the optical switch, wherein the multi-module dispersion compensation module includes a plurality of dispersion compensation modules with different compensation amounts; The uplink direction dispersion dynamic compensation module is used to select the optimal dispersion compensation module for each analog optical signal through a dispersion compensation control algorithm based on the wavelength and transmission distance of the analog optical signal of the remote node.

8. A dispersion compensation device in a RoF system based on a PON network, characterized in that: Includes the following modules: A dispersion compensation deployment module in the downstream direction is used to set a dispersion compensation module after the optical splitter or wavelength division device, or before the digital optical signal is combined with the analog optical signal, according to the wavelength and transmission distance of the analog optical signal in the downstream direction; The downlink dispersion compensation module is used to perform dispersion compensation on analog optical signals in the downlink direction through the dispersion compensation module.

9. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1-3 or 4-6.

10. 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 according to any one of claims 1-3 or 4-6.

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