RU2334359C1 - Lightwave communication system - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: method consists in separation of K edges of lightwave communication system, on each of which the total number of through-passing paths between paired corresponding communication centres exceeds minimum allowed value. For this purpose structural matrix of lightwave communication system is formed. Under formed structural matrix the total value of paths is calculated with rank not exceeding allowed value, between each paired corresponding communication centres. Then path matrix is formed between all paired corresponding communication centres, and the edges corresponding to lines of path matrix are separated for which the specified condition is satisfied. Then set of light sources with stably narrow ranges and spectral multiplex terminals on far end, and corresponding set of photodetectors and spectral multiplex terminals on far end on each centre, incidental to corresponding separated edges of lightwave communication system is provided.

EFFECT: reduction of material costs at method implementation maintaining preset throughput.

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Description

The invention relates to optical communication systems and can be used to create and improve such systems.

A known method of constructing an optical communication system (see, for example, Shmalko A.V. Digital communication networks: the basics of planning and construction. - M .: EKO-TRENDZ, 2001, p. 189-194; Ubaidulaev PP Fiber optic networks. - M .: ECO-TRENDZ, 2001, p.96-101).

In this method, I / O multiplexers are installed on each communication node, which are connected by fiber-optic communication lines.

The disadvantage of this method is the complexity of the technical implementation of the optical communication system due to the need to convert information signals from electrical form to optical and vice versa.

There is also a method of constructing an optical communication system (see, for example, Freeman R. Fiber-optic communication systems. - M .: Tekhnosfera, 2006, p.407-411, 425-428), which consists in installing optical switching equipment on communication nodes , multiplexing, amplifying and connecting them with fiber optic communication lines.

The disadvantage of this method is the low bandwidth of the optical communication system due to the transmission of each optical signal through a separate optical fiber.

Closest in its technical essence to the claimed method for constructing an optical communication system is a method for constructing according to patent CN No. 1284804 of 02.21.2001, IPC 7 Н04В 10/02 (priority application GB 1999016577 of 1999.07.15).

The prototype method consists in the fact that at the transmitting end of the communication node, a plurality of light sources and spectral compression terminals are installed, and at its receiving end, a plurality of photodetectors and spectral compression terminals are installed.

This method of construction allows you to increase the throughput of the optical communication system by transmitting multiple optical signals over a single optical fiber.

The disadvantage of the prototype method is that its implementation with a given throughput requires relatively high material costs, due to the need to use additional functional devices at each node of the optical communication system.

The aim of the claimed invention is to develop a method for constructing an optical communication system that provides a reduction in material costs for its implementation, while maintaining a given throughput.

The claimed method extends the arsenal of funds for this purpose.

размером N×N, где элемент матрицы ε_i,j=1 при i=j и ε_i,j=0 при отсутствии непосредственной связи между i-м и j-м узлами связи, а значению ε_i,j присваивают номер m-го ребра (РОТ), где m=1,2,...,М, при наличии непосредственной связи между i-м и j-м узлами. По сформированной структурной матрице

системы оптической связи вычисляют суммарное значение F^i,j путей между каждой парой Z_i,j корреспондирующих узлов связи, ранг путей r которых не превышает r_доп. С этой целью структурную матрицу

возводят в степень r_доп путем логического перемножения элементов i-й строки и j-го столбца с последующим суммированием результатов перемножения. Из возведенной в степень r_доп структурной матрицы

выделяют элементы F^1,j, отличающиеся от нуля. После чего формируют матрицу путей

размером М×Т_Σ, где

,This goal is achieved by the fact that in the known method of constructing an optical communication system containing N≥2 communication nodes combined by M≥1 edges of the optical paths (ROT), which consists in the fact that at the transmitting end of the communication node set a lot of light sources and spectral compression terminals , and at its receiving end there are a lot of photodetectors and spectral multiplexing terminals, previously isolate in the optical communication system pairs of Z _{i, j} corresponding communication nodes, where i = 1,2, ..., N, j = 1,2, .. ., N, i ≠ j. The maximum permissible value of the rank r of the _additional path between any pair of corresponding communication nodes and the minimum permissible number S _{min of} paths passing through the POT between the corresponding pairs Z _{i, j of the} corresponding communication nodes are set. Allocate K ROT, for each of which the total number S _k , where k = 1,2, ..., K, of the passing paths between pairs of Z _{i, j} corresponding communication nodes exceeds S _min . Why form the structural matrix of the optical communication system

size N × N, where the matrix element ε _{i, j} = 1 for i = j and ε _{i, j} = 0 in the absence of direct connection between the i-th and j-th communication nodes, and the number m- is assigned to the value ε _{i, j} ridge (ROT), where m = 1,2, ..., M, in the presence of a direct connection between the ith and jth nodes. According to the formed structural matrix

optical communication systems calculate the total value of F ^{i, j} paths between each pair Z _{i, j of} corresponding communication nodes, the rank of the paths r of which does not exceed r _add . To this end, the structural matrix

raise to the power r _extra by logical multiplication of the elements of the i-th row and j-th column with the subsequent summation of the results of multiplication. From the _additional structural matrix raised to the power r

distinguish elements F ^{1, j} other than zero. Then form a matrix of paths

size M × T _Σ , where

,

принимают значения 1 или 0, если ребро с номером m соответственно принадлежит или не принадлежит пути f^i,j, где f^i,j=1,2,..., F^i,j. Затем выделяют K ребер, соответствующих строкам матрицы путей

, для которых выполняется условие S≥S_min. Причем множество источников света со стабильно узкими диапазонами и терминалы спектрального уплотнения на передающем конце и соответствующее множество фотодетекторов и терминалы спектрального уплотнения на приемном конце устанавливают на каждом из узлов, инцидентных (т.е. относящихся, принадлежащих) соответствующему ребру из ранее выделенных K ребер.between all pairs Z _{i, j of} corresponding communication nodes. Moreover, the elements of the path matrix

take values 1 or 0 if the edge with the number m respectively belongs or does not belong to the path f ^{i, j} , where f ^{i, j} = 1,2, ..., F ^{i, j} . Then select K edges corresponding to the rows of the path matrix

for which the condition S≥S _min . Moreover, a plurality of light sources with stably narrow ranges and spectral densification terminals at the transmitting end and a corresponding plurality of photodetectors and spectral densification terminals at the receiving end are installed on each of the nodes incident (i.e., related, belonging) to the corresponding edge from the previously allocated K edges.

Thanks to a new set of essential features in the designed optical communication system, the installation of light sources, photodetectors and spectral compaction terminals is carried out only in the busiest areas. At the same time, installation of these devices is not performed on less busy areas, which does not reduce the overall throughput of the optical communication system. That is, to implement an optical communication system in comparison with the prototype requires a smaller number of additional elements, which reduces the overall material costs and determines the feasibility of the claimed technical result.

The analysis of the prior art made it possible to establish that analogues that are characterized by a combination of features that are identical to all the features of the claimed technical solution are absent, which indicates the compliance of the claimed method with the condition of patentability "novelty".

Search results for known solutions in this and related fields of technology in order to identify features that match the distinctive features of the claimed object from the prototype showed that they do not follow explicitly from the prior art. The prior art also did not reveal the fame of the distinctive essential features that determine the same technical result that is achieved in the claimed method. Therefore, the claimed invention meets the condition of patentability "inventive step".

The claimed method is illustrated by drawings, which show:

figure 1 is a General structural diagram of an optical communication system;

figure 2 - the composition and connection of equipment at the communication nodes incidental to the rib along which the total number of passing paths between pairs of corresponding communication nodes exceeds the minimum acceptable value;

figure 3 is a functional diagram of an optical communication system;

figure 4 - structure of a fragment of the optical communication system, presented in the form of a graph;

5 is a set of paths between pairs of corresponding nodes of the optical communication system;

6 is a dedicated MOUTH, in which the total number of paths between pairs of corresponding communication nodes exceeds the minimum acceptable value.

The implementation of the claimed method is explained as follows.

In general, a plurality of light sources, photodetectors and spectral densification terminals are used to construct an optical communication system, which increases the throughput of the communication system. On the other hand, the use of this method of construction leads to unreasonable material costs. Therefore, it is required to develop a method for constructing an optical communication system, which will reduce the economic costs of its implementation and at the same time provide a given throughput of the optical communication system at the required level, which is proposed in the claimed solution.

The implementation of the proposed method is considered on the example of the optical communication system shown in figure 1. The optical communication system consists of communication nodes 1, 2, 3, 4 connected by their corresponding incident edges. In the General case, on each node of the optical communication system (for example, on the 2nd and 3rd nodes) are installed (figure 2):

- I / O multiplexers 2.1 ', 2.1 "and 3.1', 3.1";

- light sources 2.2 ', 2.2 "and 3.2', 3.2";

- photo detectors 2.3 ', 2.3 "and 3.3', 3.3";

- spectral multiplexing terminals 2.4 and 3.4.

The outputs of the input / output multiplexers 2.1 ', 2.1 ", 3.1', 3.1" are connected to the inputs of the corresponding light sources 2.2 ', 2.2 ", 3.2', 3.2" and the outputs of the photodetectors 2.3 ', 2.3 ", 3.3', 3.3". The outputs of the light sources 2.2 ', 2.2 ", 3.2', 3.2" and the inputs of the photodetectors 2.3 ', 2.3 ", 3.3', 3.3" are connected to the inputs of the respective terminals of the spectral seal 2.4, 3.4, the outputs of which are connected to the fiber of the optical cable 6.

Functionally, the optical communication system consists of two rings (Fig. 3), in each of which synchronous signals are transmitted and each of which contains the corresponding input-output multiplexers 1.1, 2.1 ', 3.1' and 2.1 ", 3.1", 4.1, connected by fibers optical cable 6. I / O multiplexers 1.1, 4.1 and pairs of input / output multiplexers 2.1'-2.1 ", 3.1'-3.1" are located on the corresponding communication nodes 1,4,2,3 and are connected to each other by internal installation lines 5.

The implementation order of the inventive method is considered on the example of an optical communication system with the number of nodes N = 4 and ribs M = 5, shown in figure 4. In an optical communication system, pairs of corresponding communication nodes are preliminarily isolated. In this example, the pairs Z _1,3 and Z _{2,3 are} conditionally accepted. Pre-set the minimum acceptable number S _{min of} paths passing through the MOUTH between the pairs Z _1,3 and Z _2,3 corresponding to the communication nodes, for example S _min = 2. Also, the maximum permissible value of the rank r of the _additional path between any pair of corresponding nodes is preliminarily set, for example, r _additional = 2. The rank of the path is the number of edges of the communication system included in this path. For example, the rank of the path between a pair of nodes Z _1,3 is r = 1 or r = 2 (see figa). The value of the rank of the path is determined by the requirements for the quality of the channels being organized in the communication system (see, for example, Davydov GB, Roginsky VN, Tolchan A.Ya. Telecommunication networks. M: Communication, 1977, P.139).

размером N×N. В данном случае N=4, т.е. матрицу размером 4×4Then, from those entire POTs, those are selected for which the total number of passing paths S _k ≥S _min . Why form the structural matrix of the optical communication system

size N × N. In this case, N = 4, i.e. 4 × 4 matrix

, ее элемент ε_i,j, где i,j - номера узлов, т.е. i, j=1,2,3,4, принимает значение ε_i,j=1 при i=j и ε_i,j=0 при отсутствии непосредственной связи между i-м и j-м узлами связи, а значению ε_i,j присваивают номер m-го ребра, где m=1,2,..., М, т.е. m=1,2,3,4,5, если i и j принадлежат одному ребру.In the matrix

, its element ε _{i, j} , where i, j are the numbers of nodes, i.e. i, j = 1,2,3,4, takes the value ε _{i, j} = 1 for i = j and ε _{i, j} = 0 in the absence of a direct connection between the i-th and j-th communication nodes, and the value ε _{i , j} assign the number of the mth edge, where m = 1,2, ..., M, i.e. m = 1,2,3,4,5 if i and j belong to one edge.

вычисляют суммарную совокупность путей F^i,j между всеми парами корреспондирующих узлов связи, ранг которых не превышает r_доп=2.According to the formed structural matrix of the optical communication system

calculate the total set of paths F ^{i, j} between all pairs of corresponding communication nodes whose rank does not exceed r _add = 2.

возводят в степень r_доп=2 путем логического перемножения элементов i-й строки и j-го столбца с последующим суммированием результатов перемножения, т.е.To this end, the structural matrix

raise to the power r _extra = 2 by logical multiplication of elements of the i-th row and j-th column with the subsequent summation of the results of multiplication, i.e.

where the sign ∨ - means the operation of logical addition.

выделяют совокупность элементов, отличающихся от нуля, которые в свою очередь определяют совокупность F^1,3={1^1,3,2^1,3} и F^2,3={1^2,3,2^2,3} путей между парами Z_1,3 и Z_2,3 корреспондирующих узлов связи соответственно, и общая сумма путей T_Σ будет составлять T_Σ=4 (фиг.5).In the raised to the power r _extra = 2 structural matrix

allocate a set of elements other than zero, which in turn determine the set of F ^1,3 = {1 ^1,3 , 2 ^1,3 } and F ^2,3 = {1 ^2,3 , 2 ^2,3 } paths between pairs Z _1,3 and Z _2,3 corresponding communication nodes, respectively, and the total sum of the paths T _Σ will be T _Σ = 4 (figure 5).

размером М×Т_Σ между всеми парами корреспондирующих узлов связи. В данном случае М=5, T_Σ=4, т.е. матрицу размером 5×4Then form a matrix of paths

size M × T _Σ between all pairs of corresponding communication nodes. In this case, M = 5, T _Σ = 4, i.e. 5 × 4 matrix

ее элемент

, где i, j - номера узлов, т.е. i,j=1,2,3,4, f - номер пути между парой Z_i,j корреспондирующих узлов связи, т.е. f=1,2, m - номер ребра, т.е. m=1,2,3,4, принимает значение

, если ребро с номером m принадлежит пути с номером f между парой Z_i,j корреспондирующих узлов связи, а в противном случае

.In the matrix

her element

, where i, j are the numbers of nodes, i.e. i, j = 1,2,3,4, f is the number of the path between the pair Z _{i, j of the} corresponding communication nodes, i.e. f = 1,2, m is the number of the edge, i.e. m = 1,2,3,4, takes the value

if the edge with the number m belongs to the path with the number f between the pair Z _{i, j of the} corresponding communication nodes, otherwise

.

выделяют РОТ, для которых выполняется условие S_k≥2. В данном случае таковым будет ребро с номером m=2 (фиг.6).From the formed matrix of paths

isolate ROT for which the condition S _k ≥2 is fulfilled. In this case, such will be the edge with the number m = 2 (Fig.6).

Thus, as a result of the performed actions, a POT was allocated, according to which the total number of passing paths between pairs Z _1,3 and Z _{2,3 of} corresponding communication nodes exceeds S _min = 1.

Therefore, it is advisable to establish light sources 2.2 ', 2.2 ", 3.2', 3.2", photo detectors 2.3 ', 2.3 ", 3.3', 3.3" at the communication nodes with numbers 2 and 3 incident to the edge with number 2 (Fig. 2) and spectral multiplexing terminals 2.4, 3.4.

In the case of using the prototype method with four nodes, it is necessary to place an additional one light source, a photodetector and a spectral densification terminal on each communication node, that is, a total of 12 devices. In the claimed solution, the installation of these functional devices is carried out only on the nodes incident to the selected edge, i.e. only 6.

From the considered example, we can conclude that when using an optical communication system with the number of nodes N = 4, an almost twofold decrease in the number of additionally installed functional devices is ensured while preserving the throughput of the optical communication system, which when constructing an optical communication system with the number of nodes N = 10 by the claimed method -20, the gain in the number of additional functional devices will be 10 or more times.

The aforementioned indicates the possibility of achieving the formulated technical result when using the claimed technical solution.

Claims (1)

A method of constructing an optical communication system containing N≥1 communication nodes combined by M≥1 optical path edges (ROT), which consists in the fact that at the transmitting end of the communication node set a lot of light sources and spectral compaction terminals, and at its receiving end - a lot photodetectors and spectral densification terminals, characterized in that the pairs Z _{ij of the} corresponding communication nodes, where i = 1,2, ..., N, j = 1,2, ..., N, are preliminarily isolated in the optical communication system the permissible value of rank r _additional path between coo sponds pairs Z _{i, j} of corresponding communication nodes and minimally admissible number S _min paths passing through the mouth between the respective pairs of Z _{i, j} of corresponding communication nodes from a total number of edges M is isolated K ribs on each of which the total number of S _k, where k = 1,2, ..., K, of the passing paths between the pairs Z _{i, j of the} corresponding communication nodes exceeds S _min , for which they form the structural matrix of the optical communication system

size N × N, where element ε _i of the _{matrix, j} = 1 if i = j and ε _{i, j} = 0 in the absence of a direct connection between i-th and j-th communication node, and the value ε _ij assigned number m-th rib , where m = 1,2, ..., M, in the presence of a direct connection between the i-th and j-th communication nodes, then the total value F ^{i, j of} paths between each pair Z _{i, j of} corresponding communication nodes is calculated, rank paths r _{i, j of} which does not exceed r _add , for which the structural matrix

raise to the power r _extra , and in the raised to the power r _extra structural matrix

select elements F ^{i, j} other than zero, and then form a matrix of paths

size M × T _Σ , where

, between all pairs Z _{i, j of} corresponding communication nodes, and the elements

path matrices

take values 1 or 0 if the edge with the number m respectively belongs or does not belong to the path f ^{i, j} , where f ^{i, j} = 1,2, ..., F ^{i, j} , then select K edges corresponding to the rows of the path matrix

for which the condition S _k ≥S _{min is} fulfilled, moreover, a plurality of light sources with stably narrow ranges and spectral densification terminals at the transmitting end and a corresponding plurality of photodetectors and spectral multiplexing terminals at the receiving end are installed on each of the nodes incident to the corresponding edge from previously allocated K ribs.

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