Distributed arrangement method for optical splitter placement positions of whole-network passive optical network

Abstract

The invention provides a distributed arrangement method for optical splitter placement positions of a whole-network passive optical network. The arrangement method comprises the following steps: step S1, calculating attenuation characteristics of farthest and nearest terminal ONU (Optical Network Unit) equipment by using a service access point distributed matrix; s2, constructing an overall arrangement model by adopting diagonal elements; s3, finally, checking calculation is carried out by using the digital distribution set; according to the invention, unified planning, arrangement and management can be realized, rapid positioning of access network service optical splitter setting points is realized, and unified management of safe access of distribution network intelligent terminals is realized.

Description

Technical Field

[0001] The invention relates to the technical field of electric power systems, and in particular to a method for distributing the placement of optical splitters in a full-network passive optical network. Background Art

[0002] In the context of the construction of new power systems, "accelerating the transformation and upgrading of distribution networks, promoting the construction of smart distribution networks and active distribution networks, improving the carrying capacity and flexibility of distribution networks to accept new energy and diversified loads, and promoting the priority development and utilization of new energy locally" has become an important task. With the accelerated construction of smart distribution networks, in order to better support the four remote applications of "remote signaling, remote measurement, remote control, and remote adjustment", the coverage range and scale of the terminal communication access network optical fiber private network will increase rapidly. More and more access networks based on passive optical networks under XPON technology are being built.

[0003] The current PON network construction mode of the power grid is mostly a tree-structured networking mode, and the location of the splitter is extremely particular. It is necessary to comprehensively consider not only the access of the current terminal ONU equipment, but also the access and access quantity of the future terminal site ONU equipment. Therefore, the location of the splitter and the type of splitting ratio are extremely important. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a method for decentralized placement of splitter locations in a full-network passive optical network that can achieve unified planning, layout and management, rapid positioning of access network service splitter setting points, and unified management of secure access to distribution network intelligent terminals.

[0005] The present invention is implemented by the following method: a method for distributing the placement of optical splitters in a full-network passive optical network, the method comprising the following steps:

[0006] Step S1, first use the service access point distributed matrix to calculate the attenuation characteristics of the farthest and nearest terminal ONU devices;

[0007] Step S2, constructing an overall layout model using diagonal elements;

[0008] Step S3: Finally, use the digital distribution set for verification.

[0009] Furthermore, the layout of existing site splitters is planned, and the sites where PON equipment needs to be built in the distribution rooms, ring network cabinets, and switch distribution terminals covered by the access layer distribution communication network are planned.

[0010] The beneficial effects of the present invention are: the present invention can realize unified planning, layout and management, realize rapid positioning of access network service splitter setting points, and unified management of security access of distribution network intelligent terminals; improve the manageability and security of terminal communication access network, and reduce the workload of operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the method flow of the present invention.

[0012] Figure 2 This is a schematic diagram of common splitting ratio insertion loss.

[0013] Figure 3 The figure is a schematic diagram of the relevant parameters of the PON port of a common OLT.

[0014] Figure 4 The figure is a schematic diagram of the relevant parameters of the optical port of a common ONU.

[0015] Figure 5 This is the ONU networking diagram. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] See also Figure 1 As shown, the present invention provides an embodiment: a method for distributed layout of splitter locations in a full-network passive optical network, which first uses a distributed matrix of service access points to calculate the attenuation characteristics of the farthest and nearest terminal ONU devices, then uses diagonal elements to construct an overall layout model, and finally uses a digital distribution set for verification.

[0018] A method for decentralized layout of splitter locations in a full-network passive optical network is mainly to scientifically and reasonably plan the layout of existing site splitters, and to plan the locations of distribution rooms, ring network cabinets, switchgear and other distribution terminals covered by the access layer distribution communication network where PON equipment needs to be built.

[0019] The distribution design matrix equation of the area station building is:

[0020]

[0021] Note: The matrix equation represents the trunk ring station building, where the ZF element represents each station building, which is composed of 1 and 0. The subscripts are classified by the site number 1 to N to represent the first to last sites of a single optical cable ring or branch chain.

[0022] Since the ONU terminal setting points are important sites such as auxiliary control sites, "three remote controls", etc., the ZF of important stations such as auxiliary control sites, "three remote controls", and trunk ring networks is marked as 1, and other stations are marked as 0.

[0023] According to the actual demand for uplink services in the station building, plan the sites where passive optical network splitters are configured to form the matrix equation of the proposed passive optical network splitter:

[0024]

[0025] Note: The matrix equation represents the trunk ring station building, where the PT element represents each station building, which is composed of 1 and 0. The subscripts are classified by the site number 1 to N to represent the first to last sites of a single optical cable ring or branch chain.

[0026] The passive optical network splitter PT that is planned to be deployed is marked as 1, and the others are marked as 0.

[0027] According to the station type matrix and the passive optical network splitter matrix to be deployed in equations (1) and (2), the set of passive optical network splitters that need to be deployed in equation (2) for the "three remote controls" and auxiliary control sites in the backbone ring network in equation (1) is extracted by cross multiplication:

[0028]

[0029] Note: "X" represents the algorithm between matrices. The superscript T in the matrix represents the transposition symbol, and the element A in the matrix represents the station building, which is composed of 1s and 0s.

[0030] Convert the above N-row and N-column matrix into an N-row and 1-column matrix. The equation is as follows:

[0031]

[0032] If A in the set K =1, K∈[1,N], it means that a splitter is installed in this station building.

[0033] By using the determinant characteristics, the matrix of the main ring without passive splitters is calculated:

[0034]

[0035] The same principle as formula (4) is used to convert the above matrix of N rows and N columns into a matrix of N rows and 1 column:

[0036]

[0037] Note: The element B represents the station building. If B K =-1, K∈[1,N], it means that no splitter is installed in this station building.

[0038] Through the above method, the sites in the entire area are collectively selected to select suitable splitter deployment points.

[0039] Matrix algorithm planning for the entire XPON optical network

[0040] 2.1 Calculation of optical link loss

[0041] Optical link loss

[0042] =N+M+L+H (7)

[0043] Note: N represents fiber attenuation, M represents connector attenuation, L represents splice attenuation, and H represents splitter insertion loss.

[0044] 2.1.1 Fiber Attenuation Calculation

[0045] From the starting point of the optical cable to the last station building optical cable end point, the optical cable length between stations is counted in order along the optical cable. The order of the distance between the station buildings and the above formula (1) The matrix order is consistent, and the optical cable length matrix equation between each station house is as follows:

[0046]

[0047] Among them, ΔDT1 represents the distance from the initial end point of the optical cable (generally led out from a substation or other places) to the first station building, ΔDT2 represents the distance between the first station building and the second station building, and so on.

[0048] For GPON, the common downstream optical waves are 1490nm and 1310nm, and the upstream optical wave is 1310nm. In optical fiber communication, the shorter the optical wavelength, the greater the attenuation during transmission. Therefore, the 1310nm wavelength with larger optical fiber attenuation can be used to budget the optical fiber link loss. The optical fiber attenuation is determined as follows: 1310nm corresponds to attenuation a=0.36dB / km; the corresponding optical cable attenuation is calculated based on the length of the optical cable between the station buildings:

[0049]

[0050] Fiber attenuation of the Kth station:

[0051]

[0052] Note: a represents the optical link loss, GS K represents the optical fiber attenuation between the Kth station building and the K-1th station building, and N represents the total optical fiber attenuation at the Kth point.

[0053] 2.1.2 Calculation of joint loss

[0054] Fiber jumper is performed in a station building without an optical splitter. Here, an active connector is used to realize optical power transmission. There is active connector insertion attenuation, b = 0.5dB / unit. The active connector insertion attenuation of the Kth station building is:

[0055]

[0056] In the station where the optical splitter is installed, there is a fiber fusion joint attenuation, c = 0.01dB / piece. The fiber fusion insertion loss of the Kth station is:

[0057]

[0058] Note: b represents the active joint loss, c represents the direct-fusion joint loss, M represents the total active joint loss at the Kth point, and L represents the total direct-fusion joint loss at the Kth point.

[0059] 2.1.3 Calculation of splitter loss

[0060] The optical splitter has an insertion loss h. The insertion loss of the optical splitter varies with the type and splitting ratio of the optical splitter. The commonly used splitting ratio of the optical splitter is 1:2 (5%-95%). The 5% port is usually used to connect the ONU device, and the 95% port is passed to the next level. Therefore, the insertion loss connected to the station house is defined as h1 (5%), and the insertion loss of the next level is defined as h2 (95%). Taking the splitting ratio of 1:2 (5%-95%) as an example, h1 = 11.8dB, h2 = 0.6dB, and the sum of the splitter insertion loss ratios is calculated:

[0061]

[0062] Note: h, h1, h2 represent the insertion loss of the optical splitter, and H represents the total attenuation transmitted to the Kth point optical splitter.

[0063] 2.1.4 Calculation of total optical link loss

[0064] Substituting the above equations (10), (11), (12), and (13) into equation (7),

[0065]

[0066] 2.2 Attenuation judgment and networking methods

[0067] 2.2.1 Determination of optical link loss

[0068] Installation of the optical splitter requires the following:

[0069] Receiver optical sensitivity < minimum transmitted optical power - optical fiber link loss - optical cable margin (4dB). (15)

[0070] This method can be used to check whether the splitter and link levels can meet the requirements for normal operation of the equipment.

[0071] From the matrix A in k , starting from the first row of the matrix, satisfy A k =1, substitute this point into formula (14), calculate the optical link loss according to the actual situation of this point, and substitute it into formula (15). If it satisfies, the station building can achieve the installation effect of the corresponding splitter. If it does not satisfy the condition up to the k+1th point, then the network 1 is formed from the 1st point to the kth point, and the k+1th point belongs to the network 2.

[0072] 2.2.2 Networking

[0073] Each network uses a single-core fiber resource. The k+1th point and some subsequent points form network 2. Each point in the network must perform the above optical attenuation judgment to see if it meets the requirements. The optical cable link loss after network 1 includes two parts. One part is the fiber hopping loss and fiber loss (1 to k) after passing through the previous network point, and the other part is the loss between points k+1 to x. The relevant calculations are as follows:

[0074]

[0076] And so on, different sites in a link are divided to form different networks until all sites that need to install splitters are covered.

[0077] Next, we will analyze the actual case

[0078] Station type and planned deployment point screening

[0079] This issue takes the 19 station buildings involved in one of the optical cable lines from Shaxian Dispatching Building to Chengguan Substation in Shaxian area of ​​Sanming District as an example.

[0080] The station buildings are arranged from the Shaxian Dispatching Building to the Chengdong Substation. The optical cable is part of the trunk ring. The interconnected station buildings are all auxiliary monitoring points and "three remote" station buildings. The distribution design matrix equation of the area station buildings is obtained:

[0081]

[0082] According to the actual situation of the business delivery demand of the station house fed back by the owner, the station house with passive optical network splitter is planned and configured to form the matrix equation of the proposed passive optical network splitter:

[0083]

[0084] According to the above formula (19) and formula (20) station type matrix and the passive optical network splitter matrix to be deployed, the passive optical network splitter set in formula (20) that needs to be deployed in the "three remote controls" and auxiliary control stations in the trunk ring network in formula (19) is extracted by cross multiplication:

[0085]

[0086] According to formula (4), we can get:

[0087]

[0088] According to formula (5) and (6), we can get:

[0089]

[0090] Calculation of optical fiber attenuation between stations

[0091] The light attenuation is calculated using formula (7): Each ΔDT in the matrix N The data is equal to the following table, where N∈[1,19].

[0092] Table 3.2-1 Length of optical cables between station buildings

[0093]

[0094] Substituting the above data into formula (9), we can get the optical cable attenuation between each station building: According to the optical cable attenuation coefficient a = 0.36dB / km, we can get Each GS in the matrix N The data is equal to the following table, where N∈[1,19]. Based on the above information and formula (10), the fiber attenuation N between the station rooms is calculated:

[0095] Table 3.2-2 Optical cable attenuation between station buildings

[0096]

[0097]

[0098] Optical link loss calculation

[0099] Substitute the detailed distribution point positions in formula (22), combined with the joint loss (active joint loss b = 0.5dB / piece, direct-fusion joint loss c = 0.01dB / piece), the splitter insertion loss (the insertion loss connected to the station house is defined as h1, and the insertion loss transmitted to the next level is defined as h2), and substitute them into (11), (12), and (13) respectively to obtain the losses corresponding to M, L, and K. Substitute the whole into formula (14) to obtain the fiber attenuation:

[0100]

[0101] Table 3.3-1 Optical link loss statistics

[0102]

[0103]

[0104]

[0105] Attenuation judgment and network division

[0106] Attenuation judgment

[0107] Formula (14) is used to calculate the optical link loss in the station room where the PON equipment is arranged according to the plan in formula (22). Combined with the relevant parameters of the equipment, and through the formula: receiving end optical sensitivity < minimum transmission optical power - optical fiber link loss - optical cable margin (4dB) (15), the following data can be obtained by continuous loop judgment:

[0108] Table 3.4-1 Statistics of optical link loss in different networks

[0109]

[0110]

[0111]

[0112] Network Division

[0113] Depend on Figure 3 and Figure 4 From the equipment parameter analysis, it can be seen that the acceptable optical cable attenuation range of the equipment is: 0~26.8dB; from the data analysis of the above Table 3.3-1, when in station room 10, the optical link attenuation is 26.3dB, which meets the judgment formula (15), and when in station room 11, the optical link attenuation is 27.4dB, which does not meet the judgment formula (15). Therefore, according to formulas (16) and (17), the network is segmented. It can be seen that starting from the Shaxian Dispatching Building, the 2nd station room to the 10th station room is the first network, and the 11th station room to the 19th station room is the second network. The details are as follows Figure 5 shown.

[0114] In summary, the present invention can promote the construction of power distribution communication network and power dedicated network

[0115] This project and its optimal solution effectively solve the problems of XPON technology being difficult to deploy in the power distribution communication network and the difficulty in calculating the optical link loss over the years. It effectively solves the deployment and selection of points in the realization of multi-service collection and transmission of power distribution communication terminals, and significantly reduces the construction cost of new power systems and smart lines through accurate distributed deployment calculations.

[0116] Promote national urban and rural planning and construction

[0117] This project combines the XPON network layout planning of the power distribution communication network, and takes the lead in realizing the deployment of the XPON optical fiber private network of the power distribution communication network at the best power distribution communication terminal locations of the 10kV and other lines of the distribution network, which greatly saves the investment in telecommunication infrastructure construction and achieves remarkable economic and social benefits.

[0118] Promote the realization of national dual carbon goals

[0119] The construction of power distribution communication network is increasingly becoming an important pillar of modern social development. The technology in this paper strongly supports the construction of optical fiber private network of power distribution communication network, improves the efficiency and reliability of power grid, and helps to reduce energy waste and carbon emissions. At the same time, it also promotes the use of clean energy and helps to promote a green and low-carbon economic development model. It is of great significance to achieve the dual carbon goals.

[0120] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A method for distributing the placement of optical splitters in a full-network passive optical network, characterized in that: The arrangement method comprises the following steps: Step S1, first use the service access point distributed matrix to calculate the attenuation characteristics of the farthest and nearest terminal ONU devices; Step S2, constructing an overall layout model using diagonal elements; Step S3: Finally, use the digital distribution set for verification.

2. The method for distributing the placement of optical splitters in a full-network passive optical network according to claim 1, characterized in that: Plan the layout of existing site splitters, and plan the sites where PON equipment needs to be built in distribution rooms, ring network cabinets, and switch distribution terminals covered by the access layer distribution communication network.

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