JP2003014941A - Optical fiber selecting system, the optical fiber selecting method, manufacturing method of optical fiber transmission line, optical fiber transmission line, optical fiber cable, optical fiber selecting program, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber selecting system by which an optical fiber can efficiently be selected for constituting an optical fiber transmission line. SOLUTION: The optical fiber selecting system 10 selects one or more optical fibers for constituting the optical fiber transmission line which has predetermined characteristics from a plurality of optical fibers of selection candidates having different characteristics with each other. The optical fiber selecting system 10 is provided with an optical fiber selection part 14 which selects the one or more optical fibers by using a genetic algorithm from the optical fibers of the selection candidates, and an array order determining part 16 which determines the array order of each selected optical fiber so that the equivalent effective core cross section area of the optical fiber transmission line is maximized when the optical fibers are selected by the optical fiber selection part 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber selection system, an optical fiber selection method, an optical fiber transmission line manufacturing method, an optical fiber transmission line, an optical fiber cable, an optical fiber selection program, and a recording medium. is there.

[0002]

2. Description of the Related Art When constructing a long optical fiber transmission line used for, for example, a submarine cable, some optical fibers are selected from a plurality of selection candidate optical fibers, and the selected optical fibers are connected. Thus, an optical fiber transmission line having a desired length is constructed.

Here, the optical fiber used not only for the submarine cable but also for the optical cable is subject to a large strain when the cable is laid or repaired, and therefore a predetermined strength is required. Therefore, a proof test under high tension is required in the manufacturing process, and the low strength portion is forcibly broken. Therefore, the length of the optical fiber before connection is several km
~ Often tens of kilometers apart.

[0004]

On the other hand, with the advancement of optical communication technology, an optical fiber transmission line formed by connecting a plurality of optical fibers having different structural designs has not only a length but also a wavelength dispersion. Various characteristics such as dispersion slope, number of connection points, equivalent effective core area, and transmission loss are required to be within a desired range. This makes it possible to avoid a non-linear phenomenon such as four-wave mixing when performing wavelength division multiplexing optical communication using the optical fiber transmission line after connection, and to achieve long-distance non-repeater optical communication. In this case, in order to connect a plurality of optical fibers to form an optical fiber transmission line, a plurality of optical fibers to be connected (single optical fiber , Which may be the case), and the selection of such an optical fiber is extremely difficult. As a result, it is difficult to make efficient selections, and the amount of optical fibers that are not selected and are discarded increases. Further, even if the optical fibers have the same structural design, a certain degree of distribution is usually generated in the above characteristics due to manufacturing variations.

In recent years, an optical fiber having two different transmission characteristics (for example, an optical fiber having both positive chromatic dispersion and dispersion slope and an optical fiber having negative chromatic dispersion and dispersion slope) is actively used. The number of so-called hybrid-type optical fiber transmission lines, which realize desired characteristics as a whole of the optical fiber transmission lines by combining them, is increasing. In this case, it is necessary to consider the length ratio of each of the optical fibers having the above-mentioned two different transmission characteristics, which are factors that seriously affect the characteristics of the optical fiber transmission path, and it is difficult to select the optical fiber. Sex increases.

Here, a computer is used to calculate each transmission characteristic of the optical fiber transmission line when the optical fiber transmission line is configured by all possible optical fiber combinations, and obtain the optimum combination of optical fibers. (Selecting an optical fiber) can be considered (so-called brute force method), but it is not realistic because the calculation time becomes long. In addition, even if an optimal combination of optical fibers is obtained, in the conventional method, the optical fibers remaining unselected are forced to be discarded, and the viewpoint of reducing the discard length is also included. It was difficult to obtain a combination method.

Considering, for example, wavelength division multiplexing transmission (WDM), it is desirable that the absolute value of the dispersion slope is small (ideally zero) in the transmission line in the unit section corresponding to the repeater interval. In addition, the chromatic dispersion needs to be adjusted to the vicinity of a specific value that is not zero in the wavelength used for transmission. In order to satisfy this condition, the characteristics of the optical fiber must be taken into consideration.

Further, the end-length optical fiber generated when the long-length optical fiber is divided may be effectively used in combination with another optical fiber. When the length of the optical fiber changes, it is easy to predict the characteristics that change in proportion to the length, but the characteristics such as chromatic dispersion are not so, and the prediction becomes extremely difficult. . Further, even when connecting a short optical fiber, it is extremely difficult to predict a characteristic such as an equivalent effective core area which does not become a simple arithmetic sum.

Therefore, according to the present invention, when selecting one or a plurality of optical fibers for forming an optical fiber transmission line having a predetermined characteristic from a plurality of selection candidate optical fibers having different characteristics, An optical fiber selection system capable of efficiently selecting one or a plurality of optical fibers, an optical fiber selection method, an optical fiber transmission line manufacturing method using the same, an optical fiber transmission line, an optical fiber cable, and An object of the present invention is to provide an optical fiber selection program for realizing the above optical fiber selection method and a computer-readable recording medium recording the program.

[0010]

In order to solve the above problems, an optical fiber selection system of the present invention is an optical fiber transmission line having a predetermined characteristic from a plurality of selection candidate optical fibers having different characteristics. An optical fiber selection system for selecting one or a plurality of optical fibers for configuring the above, wherein the one or a plurality of optical fibers are selected from the plurality of selection candidate optical fibers by using a genetic algorithm. It is characterized in that a selection means is provided.

By selecting the optical fiber by using the genetic algorithm, it is possible to select the optical fiber with an extremely small number of calculations as compared with the case where the optical fiber is selected by the brute force method. Also, by selecting an optical fiber using a genetic algorithm, there is a possibility of falling into a local optimum solution (local minimum), as compared with the case of selecting an optical fiber by an optimization method such as a common benefit gradient method. It is possible to select an optical fiber or a combination of optical fibers that are reduced and suitable throughout.

In the optical fiber selection system of the present invention, the plurality of selection candidate optical fibers include an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength. A fiber is included, and the selecting means includes an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength, It is preferable that the selection is characterized.

When an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength are connected to form an optical fiber transmission line, the above-mentioned two types of optical fibers are used. The length ratio of each must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, by selecting an optical fiber using a genetic algorithm in such a case, it is possible to alleviate the difficulty of selecting the optical fiber.

In the optical fiber selection system of the present invention, the plurality of selection candidate optical fibers include an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength. A fiber is included, and the selecting means includes an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength,
It is preferable that the plurality of optical fibers are selected.

When an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength are connected to form an optical fiber transmission line, the above two types of optical fibers are used. The length ratio of each must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, by selecting an optical fiber using a genetic algorithm in such a case, it is possible to alleviate the difficulty of selecting the optical fiber.

Further, in the optical fiber selection system of the present invention, when a plurality of optical fibers are selected by the selecting means, the selection is made so that the equivalent effective core cross-sectional area of the optical fiber transmission line becomes maximum. It is preferable that the apparatus further comprises a determining means for determining the arrangement order of each of the plurality of optical fibers.

By determining the arrangement order of each of the selected optical fibers so that the equivalent effective core cross-sectional area of the optical fiber transmission line is maximized, the occurrence of a non-linear phenomenon that adversely affects signal transmission is reduced. be able to.

In order to solve the above problems, the optical fiber selection method of the present invention configures an optical fiber transmission line having a predetermined characteristic from among a plurality of selection candidate optical fibers having different characteristics. 1. An optical fiber selection method for selecting one or more optical fibers according to claim 1, further comprising a selection step of selecting one or more optical fibers from the plurality of selection candidate optical fibers by using a genetic algorithm. It is characterized by that.

By selecting the optical fiber by using the genetic algorithm, it is possible to select the optical fiber with an extremely small number of calculations as compared with the case where the optical fiber is selected by the brute force method. Also, by selecting an optical fiber using a genetic algorithm, there is a possibility of falling into a local optimum solution (local minimum), as compared with the case of selecting an optical fiber by an optimization method such as a common benefit gradient method. It is possible to select an optical fiber or a combination of optical fibers that are reduced and suitable throughout.

In the optical fiber selection method of the present invention, the plurality of selection candidate optical fibers include an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength. A fiber is included, and the selection step includes an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength, the plurality of optical fibers It is preferable that the selection is characterized.

When an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength are connected to form an optical fiber transmission line, the above-mentioned two types of optical fibers are used. The length ratio of each must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, by selecting an optical fiber using a genetic algorithm in such a case, it is possible to alleviate the difficulty of selecting the optical fiber.

In the optical fiber selection method of the present invention, the plurality of selection candidate optical fibers include an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength. A fiber and the selecting step includes an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength,
It is preferable that the plurality of optical fibers are selected.

When an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength are connected to form an optical fiber transmission line, the above two types of optical fibers are used. The length ratio of each must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, by selecting an optical fiber using a genetic algorithm in such a case, it is possible to alleviate the difficulty of selecting the optical fiber.

Further, in the optical fiber selecting method of the present invention, when a plurality of optical fibers are selected in the selecting step, they are selected so that the equivalent effective core sectional area of the optical fiber transmission line becomes maximum. It is preferable that the method further comprises a determining step of determining the arrangement order of each of the plurality of optical fibers.

By determining the arrangement order of each of the selected optical fibers so that the equivalent effective core cross-sectional area of the optical fiber transmission line is maximized, the occurrence of a non-linear phenomenon that adversely affects signal transmission is reduced. be able to.

Further, in the method for manufacturing a shining fiber transmission line of the present invention, a plurality of optical fibers are selected from a plurality of selection candidate optical fibers having mutually different characteristics, and the selected plurality of optical fibers are respectively connected. A method of manufacturing an optical fiber transmission path having a predetermined characteristic by manufacturing the optical fiber transmission path, wherein the plurality of optical fibers are selected from the plurality of selection candidate optical fibers by using a genetic algorithm. And a connecting step for connecting each of the plurality of optical fibers selected in the selecting step.

By selecting the optical fiber by using the genetic algorithm, it is possible to select the optical fiber with an extremely small number of calculations as compared with the case where the optical fiber is selected by the brute force method. Also, by selecting an optical fiber using a genetic algorithm, there is a possibility of falling into a local optimum solution (local minimum), as compared with the case of selecting an optical fiber by an optimization method such as a common benefit gradient method. It is possible to select an optical fiber or a combination of optical fibers that are reduced and suitable throughout.

In the method of manufacturing an optical fiber transmission line of the present invention, the plurality of selection candidate optical fibers have an optical fiber having a positive chromatic dispersion at the signal light wavelength and a negative chromatic dispersion at the signal light wavelength. And an optical fiber whose chromatic dispersion at the signal light wavelength is positive, and an optical fiber whose chromatic dispersion at the signal light wavelength is negative, wherein the selection step includes: It is preferable that the optical fiber is selected.

When an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength are connected to form an optical fiber transmission line, the above-mentioned two types of optical fibers are used. The length ratio of each must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, by selecting an optical fiber using a genetic algorithm in such a case, it is possible to alleviate the difficulty of selecting the optical fiber.

In the optical fiber transmission line manufacturing method of the present invention, the plurality of selection candidate optical fibers have an optical fiber having a positive dispersion slope at the signal light wavelength and a negative dispersion slope at the signal light wavelength. And an optical fiber whose dispersion slope at the signal light wavelength is positive, and an optical fiber whose dispersion slope at the signal light wavelength is negative, wherein the selection step includes: It is preferable that the optical fiber is selected.

When an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength are connected to form an optical fiber transmission line, the above two types of optical fibers are used. The length ratio of each must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, by selecting an optical fiber using a genetic algorithm in such a case, it is possible to alleviate the difficulty of selecting the optical fiber.

Further, in the optical fiber transmission line manufacturing method of the present invention, each of the plurality of optical fibers selected in the selection step is selected so that the equivalent effective core cross-sectional area of the optical fiber transmission line is maximized. A determining step of determining an arrangement order, wherein the connecting step connects each of the plurality of optical fibers selected in the selecting step in accordance with the arrangement order determined in the determining step. It is suitable.

By determining the arrangement order of each of the selected optical fibers so that the equivalent effective core cross-sectional area of the optical fiber transmission line is maximized, the occurrence of a non-linear phenomenon that adversely affects signal transmission is reduced. be able to.

Further, the optical fiber transmission line of the present invention is characterized by being manufactured by any one of the above optical fiber transmission line manufacturing methods.

Since the optical fiber is manufactured by any one of the above methods for manufacturing an optical fiber transmission path, the optical fibers forming the optical fiber transmission path can be efficiently selected.

The optical fiber cable of the present invention is characterized by including an optical fiber transmission line manufactured by any one of the methods for manufacturing an optical fiber transmission line described above.

Since the optical fiber transmission line included in the optical fiber cable is manufactured by any one of the above optical fiber transmission line manufacturing methods, the optical fibers forming the optical fiber transmission line can be efficiently selected. .

In order to solve the above problems, the optical fiber selection program of the present invention causes a computer to select an optical fiber transmission line having a predetermined characteristic from a plurality of selection candidate optical fibers having mutually different characteristics. An optical fiber selection program for selecting one or a plurality of optical fibers for configuring, wherein a computer selects one or a plurality of optical fibers from among the plurality of selection candidate optical fibers by using a genetic algorithm. It is characterized in that a selecting step for selecting is executed.

By executing the program on a computer and selecting an optical fiber by using a genetic algorithm, the optical fiber is selected with an extremely small number of calculations as compared with the case where the optical fiber is selected by the brute force method. be able to. Also, by selecting an optical fiber using a genetic algorithm, there is a possibility of falling into a local optimum solution (local minimum), as compared with the case of selecting an optical fiber by an optimization method such as a common benefit gradient method. It is possible to select an optical fiber or a combination of optical fibers that are reduced and suitable throughout.

In the optical fiber selection program of the present invention, the plurality of selection candidate optical fibers include an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength. A fiber is included, and the selection step includes an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength, the plurality of optical fibers It is preferable that the selection is characterized.

When an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength are connected to form an optical fiber transmission line, the above-mentioned two types of optical fibers are used. The length ratio of each must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, by selecting an optical fiber using a genetic algorithm in such a case, it is possible to alleviate the difficulty of selecting the optical fiber.

In the optical fiber selection program of the present invention, the plurality of selection candidate optical fibers include an optical fiber having a positive dispersion slope at the signal light wavelength,
An optical fiber having a negative dispersion slope at the signal light wavelength is included, and the selecting step includes an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength. It is preferable that the plurality of optical fibers are selected so as to include

When an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength are connected to form an optical fiber transmission line, the above two types of optical fibers are used. The length ratio of each must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, by selecting an optical fiber using a genetic algorithm in such a case, it is possible to alleviate the difficulty of selecting the optical fiber.

Further, in the optical fiber selection program of the present invention, when the computer selects a plurality of optical fibers in the selecting step, the equivalent effective core sectional area of the optical fiber transmission line is maximized. It is preferable that the determination step of determining the arrangement order of each of the selected plurality of optical fibers is executed.

By causing the computer to execute the program and determining the arrangement order of each of the selected optical fibers so that the equivalent effective core cross-sectional area of the optical fiber transmission line is maximized, the signal transmission is adversely affected. It is possible to reduce the occurrence of non-linear effects.

In order to solve the above problems, the computer-readable recording medium of the present invention is characterized by recording any one of the above optical fiber selection programs.

By causing a computer to execute the program recorded in the recording medium and selecting an optical fiber by using a genetic algorithm, the number of calculations is extremely small as compared with the case where the optical fiber is selected by the brute force method. The optical fiber can be selected with. In addition, by selecting an optical fiber using a genetic algorithm, compared to the case of selecting an optical fiber by an optimization method such as the common gradient method, a local optimum solution (local minimum) is obtained.
It is possible to select a suitable optical fiber or a combination of optical fibers over the entire area.

Further, the recording medium of the present invention is characterized in that information for identifying one or a plurality of optical fibers selected in the above-mentioned optical fiber selection system is recorded.

By using a recording medium in which information specifying the selected optical fiber is recorded, it is possible to easily store such information in the third area.
It is possible to communicate to the person.

Further, in the recording medium of the present invention, information specifying one or a plurality of optical fibers selected in the above-mentioned optical fiber selection system, and the arrangement order determined in the above-mentioned optical fiber selection system are specified. It is preferable that the information for recording is recorded.

By using a recording medium in which information specifying the selected optical fiber and information specifying the arrangement order are recorded, it is possible to easily transmit the information to a third party.

[0052]

BEST MODE FOR CARRYING OUT THE INVENTION An optical fiber selection system according to an embodiment of the present invention will be described with reference to the drawings. The optical fiber selection system according to the present embodiment, from a plurality of selection candidate optical fibers having different characteristics,
It is an optical fiber selection system for selecting one or a plurality of optical fibers for constructing an optical fiber transmission line having a predetermined characteristic. First, the configuration of the optical fiber selection system according to the present embodiment will be described. FIG. 1 is a configuration diagram of an optical fiber selection system according to the present embodiment.

The optical fiber selection system 10 according to the present embodiment physically includes a CPU (central processing unit), a memory, an input device such as a mouse and a keyboard, a display device such as a display, a storage device such as a hard disk. It is configured as a computer system equipped with it. In addition, as shown in FIG. 1, the optical fiber selection system 10 includes a storage unit 12, an optical fiber selection unit 14 (selection unit), and an arrangement order determination unit 16 (determination unit) as functional components. It is equipped with. Hereinafter, each component will be described in detail.

An optical fiber database 12a is stored in the storage unit 12. FIG. 2 is a configuration diagram of the optical fiber database 12a. Optical fiber database 1
As shown in FIG. 2, 2a stores the characteristics of each of a plurality of selection candidate optical fibers (for example, about 100) that are candidates for forming an optical fiber transmission line. Such characteristics include, for example, the length of the optical fiber, chromatic dispersion at the signal light wavelength (hereinafter simply referred to as chromatic dispersion), dispersion slope at the signal light wavelength (hereinafter simply referred to as dispersion slope), effective core cross-sectional area, fiber loss. , Non-linear refractive index, etc.

The plurality of selection candidate optical fibers are
Optical fibers having different characteristics. here,
Optical fibers having mutually different characteristics mean that all of the plurality of selection candidate optical fibers do not have the same characteristics, and some of the plurality of selection candidate optical fibers have the same characteristics. The case of having is also included.
In this case, even if the design values are the same, a plurality of optical fibers whose actual characteristics are slightly different from each other due to variations in manufacturing can be considered as optical fibers having different characteristics. Further, the plurality of selection candidate optical fibers include both an optical fiber having a positive chromatic dispersion at the signal light wavelength (for example, 1.55 μm) and an optical fiber having a negative chromatic dispersion at the signal light wavelength. In addition, both an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength are included.

Returning to FIG. 1, the optical fiber selector 14
From the plurality of selection candidate optical fibers whose characteristics are stored in the optical fiber database 12a, a genetic algorithm is used to select one or a plurality of optical fibers for forming an optical fiber transmission line having a predetermined characteristic. To do. More specifically, the optical fiber selection unit 14 determines whether or not each of the plurality of selection candidate optical fibers is selected.
The sequence of "1" and "0" represented by 1 "and" 0 "(if there are 100 selection candidate optical fibers, a sequence of 100-digit binary number) is selected according to the gene, selection, mating, and sudden Repeat generations while making mutations, search for a combination of optical fibers with high adaptability with respect to a predetermined evaluation index for the optical fiber transmission line, and use the searched optical fiber to configure the optical fiber transmission line. The fiber is selected as the fiber, and the specific procedure for selecting the optical fiber using the genetic algorithm will be described in detail later.

The arrangement order determination unit 16 selects the plurality of selected optical fibers so that the equivalent effective core cross-sectional area of the optical fiber transmission line is maximized when the selected optical fibers are selected by the optical fiber selection unit 14. Determine the sequence order of each. Here, the equivalent effective core cross-sectional area A _eff of the optical fiber transmission line formed by connecting a plurality of optical fibers is expressed by the following equation (1).

[Equation 1] Where α (F _i ), A _eff (F _i ), n ₂ (F _i ), L
(F _i ) is an optical fiber F _i connected to the i-th
Fiber loss, effective core area, nonlinear refractive index, and length, and α (Re), A _eff (Re), n ₂ (Re), L
(Re) is the fiber loss, effective core area, nonlinear refractive index, and length of the reference fiber F _i . Sp (F _i ) is the connection loss between the i-th connected optical fiber F _i and the i + 1-th connected optical fiber F _{i + 1} . Here, α (F ₀ ), n
₂ (F ₀ ) and L (F ₀ ) are all set to 1.

The arrangement order determination unit 16 determines the arrangement order of each of the plurality of optical fibers so that the value of the above equation (1) becomes maximum. Here, the number of optical fibers selected by the optical fiber selection unit 14 is smaller than the number of selection candidate optical fibers. Therefore, the arrangement order determination unit 16
Is, for example, the equivalent effective core cross-sectional area of the optical fiber transmission line is calculated using the above equation (1) with respect to all possible arrangement orders of the optical fibers selected by the optical fiber selection unit 14, and the equivalent effective core cross-sectional area is calculated. It is sufficient to determine the arrangement order that maximizes. When a single optical fiber is selected by the optical fiber selection unit 14 as an optical fiber forming the optical fiber transmission line, the arrangement order determination unit 16 does not determine the arrangement order.

Each of the plurality of optical fibers selected by the optical fiber selection unit 14 is arranged in the order determined by the arrangement order determination unit 16 (one recorded as electronic data, one printed on a paper medium). Etc.), and is connected by the optical fiber connecting device 18. As a result, an optical fiber transmission line composed of such a plurality of optical fibers is manufactured. As described above, even when the characteristics of the optical fiber transmission line composed of a plurality of selected optical fibers do not become the arithmetic sum of the characteristics of the individual optical fibers, the characteristics of the optical fiber transmission line are evaluated by an appropriate evaluation calculation. Therefore, it is possible to properly select the optical fiber.

Next, the operation of the optical fiber selection system according to the present embodiment will be described, and the manufacturing method of the optical fiber transmission line according to the embodiment of the present invention will be described. The optical fiber selection method according to the embodiment of the present invention is included in the optical fiber transmission line manufacturing method according to the above embodiments.

FIG. 3 is a flow chart showing the operation of the optical fiber selection system 10 according to the present embodiment (including the operation of the optical fiber connection device 18).

In the operation of the optical fiber selection system 10 according to this embodiment, first, as shown in FIG.
1 for constructing an optical fiber transmission line having a predetermined characteristic by using the genetic algorithm from the plurality of selection candidate optical fibers whose characteristics are stored in the optical fiber database 12a by the optical fiber selection unit 14. Alternatively, a plurality of optical fibers are selected (S12). More specifically,
An array of "1" and "0" that represent whether or not each of a plurality of selection candidate optical fibers is selected by "1" and "0" (if there are 100 selection candidate optical fibers, 100 digits The binary sequence of
Generations are repeated while mutation is performed, and a combination of optical fibers having high adaptability to a predetermined evaluation index for the optical fiber transmission line is searched, and the searched optical fiber constitutes the optical fiber transmission line. Selected as the optical fiber for. Hereinafter, a specific procedure for selecting the optical fiber by the genetic algorithm will be described in detail.

FIG. 4 is a flow chart showing a specific procedure for selecting an optical fiber by the genetic algorithm. In selecting an optical fiber for constructing an optical fiber transmission line by a genetic algorithm, first, as shown in FIG. 4, parameters used for the genetic algorithm and a fitness calculation formula are input ( S2
2). Here, as the parameters used in the genetic algorithm, the number of genes for each generation corresponding to the number of optical fiber combination candidates, the crossover probability (or crossover number) in each generation, the mutation probability (or the number of mutations), The elite selection rate (or the number of elite selections), the number of repeated generations (or conditions for repeating generations), and the like are applicable.

Subsequently, an initial candidate, that is, a first generation gene is generated (S24). The generation of the initial candidate is performed by indicating whether or not each of the plurality of selection candidate optical fibers is selected by "1" and "0", respectively, "1" and "0".
Array (if there are 100 selection candidate optical fibers, 10
It is carried out by generating a 0-digit binary sequence) as a gene. In this case, a random number is generated for each of the plurality of selection candidate optical fibers, and whether or not each of the plurality of selection candidate optical fibers is selected based on this random number,
That is, it may be determined whether it is "1" or "0". Here, genes are generated by the number of genes (for example, 100) for each generation input in the parameter / fitness calculation formula input step S22. When an upper limit is set for the number of selected optical fibers, combinations exceeding the upper limit may be excluded in advance.

When the candidates in the generation are generated, the fitness of each of the generated plurality of candidates is evaluated (S2).
6). FIG. 5 is a flowchart showing a specific procedure of fitness evaluation. In the fitness evaluation, as shown in FIG. 5, first, the characteristic value is calculated (S52). More specifically, as the characteristic value, the number of selected optical fibers (that is, the number of optical fibers forming the optical fiber transmission line), the chromatic dispersion of each of the selected optical fibers (the chromatic dispersion is , Fiber Optic Database 1
2a), the chromatic dispersion of the optical fiber transmission line is calculated.

When the characteristic value is calculated, the scrap length adjusting process is performed based on the characteristic value (S54). Figure 6
[Fig. 6] is a flowchart showing a specific procedure of the disposal length adjustment process. In the discard length adjusting process, first, a discard length (that is, an extra length) when an optical fiber transmission line having a desired length is configured using the selected optical fiber is calculated (S72). ). More specifically, first, the length of the optical fiber transmission line to be configured is subtracted from the sum of the lengths of the selected optical fibers (its length if there is one selected optical fiber). , The difference is calculated as the scrap length. In this case, it is also possible to set an upper limit on the discard length or set a lower limit on the optical fiber length after the discard.

The upper limit of the discard length is set because the characteristics may change from those before discarding if the length of the optical fiber to be discarded is long. Therefore, the optical fiber transmission lines that are combined to match the initial characteristics are used. This is to avoid that the characteristics of are not as expected.

For example, if the total length of the optical fibers used for this transmission line is 3300 m longer than the length of the transmission line to be constructed, 3300 m will be discarded and the lengths will be adjusted. The upper limit of the discard length from one optical fiber is 3000 m
Then, one to 1600 m and one to 1700 m of the optical fibers used for the transmission path can be discarded, and the discard length from one can be shortened.

If the lower limit of the length of the optical fiber used for the transmission line (the length after discarding the extra length) is set to 4200 m, the length of the optical fiber used for this transmission line is longer than the length of the transmission line to be constructed. Is 400m longer and 4400m
4400m to 40 with optical fiber included
If 0m is discarded, the lower limit will not be met. In this case, discard the excess length from the other optical fiber and
The scrap from 0m can be 200m or less.

As a result, it is judged whether or not the scrap length is positive (S74). If the scrap length is not positive (for example, the scrap length is 0), no special processing thereafter is performed. The scrap length adjustment process ends.

On the other hand, if the discard length is positive, it is determined from which of the plurality of selected optical fibers the discard length is cut out (S76). More specifically, the chromatic dispersion of the optical fiber transmission line is calculated assuming that the discard length is removed from each of the selected optical fibers, and the chromatic dispersion of the optical fiber transmission line is closest to the target value. As such, the optical fiber to be discarded should be determined.
When the number of selected optical fibers is one, the discard length is removed from the optical fiber.

Returning to FIG. 5, when the discard length adjusting process is completed, the number of selected optical fibers and the wavelengths of the selected plurality of optical fibers are again measured in a state where the discarded length is discarded. Characteristic values such as dispersion and chromatic dispersion of the optical fiber transmission line are calculated (S56). When the characteristic value is already calculated and stored in the storage means or the like, the characteristic value is read and used.

When the characteristic value is calculated again after the scrap length adjustment process, the calculated characteristic value is used to calculate the fitness of each of the plurality of generated candidates (S5).
8). Here, the fitness E is calculated according to the following equation (2), for example.

[Equation 2] Here, n is the number of characteristics used for evaluation (the number of selected optical fibers, the chromatic dispersion of each of the selected optical fibers, the chromatic dispersion of the optical fiber transmission line, and the discard length of 4).
If the evaluation is based on one characteristic, n = 4), x
_i is a characteristic value for the i-th characteristic, xt _i is a target value for the i-th characteristic, σ _i is a coefficient for normalizing the numerator with respect to the i-th characteristic (defined for each of the plurality of characteristics), α _i is a weight for the fitness E of the i-th characteristic. It should be noted that α _i (i = 1 to n) is determined according to the importance or priority of various characteristics in the optical fiber transmission line. In this case, for example, "long fiber",
To increase the fitness E when an optical fiber that is difficult to use normally such as "fiber with a large loss" is selected, or to increase the fitness E when the discard length decreases. You can also Here, the fitness E increases as the characteristic of the optical fiber transmission line approaches the target value.

When the fitness is calculated, it is determined whether the current number of generations is larger than the designated number of generations (S60).
If the current number of generations is less than or equal to the specified number of generations,
The fitness evaluation processing ends without performing any special processing. On the other hand, when the current number of generations is larger than the designated number of generations, the fitness calculated according to the above equation (2) is corrected (S62). More specifically, first, it is determined whether or not the characteristic values of all or some of the plurality of characteristics used for evaluation are within a certain range (standard range) including the target value. Here, every time there is a characteristic value out of a certain range (standard range) including the target value, for example, 0.0
The fitness E is reduced by multiplying by 1. Here, the specified number of generations is a number smaller than the number of repeated generations by a certain number of times. By doing so, it becomes possible to efficiently select the optical fiber for forming the optical fiber transmission line conforming to the standard in the latter half of the calculation (at the stage of approaching the number of repeated generations).

When the fitness of each candidate in the generation is evaluated, returning to FIG. 4, the elite selection is performed (S
28). The elite selection is a process of unconditionally determining a candidate (gene) having a high fitness as a next-generation candidate (gene) among the candidates (genes) in the generation according to the elite selection rate. For example, the number of genes in each generation is 1
When the elite selectivity is 0.2, the fitness E is high among the 100 candidates in the generation.
Is unconditionally selected as a candidate for the next generation.

After the elite selection is made, the roulette selection is made to determine the remaining candidates for the next generation (S30). Roulette selection is the candidate of the generation except the candidates selected by the elite selection,
The remaining candidates for the next generation are selected using random numbers or the like. In this case, a candidate having a higher fitness E is selected with higher probability. Here, by roulette selection, next generation candidates are selected by the number obtained by subtracting the number of elites already selected from the number of genes for each generation. In this case, the same candidate may be selected redundantly.

Subsequently, crossover and mutation are performed on the candidates selected by roulette selection (S3).
2). Regarding the crossover, a part of two specific candidate genes (the sequence of "1" and "0") is replaced according to the previously inputted crossover probability. Regarding mutations,
Depending on the mutation probability entered in advance, the specific gene ("
Invert "1" or "0" in the array of "1" and "0").

When the crossover and mutation are completed, the candidates selected by the elite selection and the candidates selected by the roulette selection and passed through the crossover and mutation are determined as the next generation candidates (S34).

Subsequently, it is judged whether or not the current number of generations exceeds the number of repeated generations input in advance (S36). If the number of current generations does not exceed the number of repeated generations input in advance, an adaptation is made. The processing from the degree evaluation (S26) to the next generation candidate determination (S34) is repeated. On the other hand, if the current number of generations exceeds the number of repeated generations entered in advance,
One or a plurality of optical fibers described by the sequence of the gene having the highest fitness in this generation is determined as an optical fiber forming an optical fiber transmission line (S3).
8). When a plurality of optical fiber transmission lines are formed, the processes from initial candidate generation (S24) to optical fiber determination (S38) are repeated until the designated number of optical fiber transmission lines are formed (S40). In this case, the already selected optical fiber is excluded from the selection candidate optical fibers in the subsequent processing. Further, even when the designated number of optical fiber transmission lines are not yet configured, the process ends when there are no more optical fibers as selection candidates.

When the process of selecting the optical fibers forming the optical fiber transmission path is completed, returning to FIG. 3, the arrangement order determination unit 16 determines the arrangement order of the selected optical fibers (S14). More specifically, when a plurality of optical fibers are selected by the optical fiber selection unit 14 as the optical fibers forming the optical fiber transmission line, selection is performed so that the equivalent effective core cross-sectional area of the optical fiber transmission line becomes maximum. The arrangement order of each of the plurality of optical fibers thus determined is determined.
Here, the equivalent effective core cross-sectional area of the optical fiber transmission line formed by connecting a plurality of optical fibers is expressed by the above-mentioned formula (1). Therefore, the arrangement order of each of the plurality of optical fibers is determined so that the value of the above formula (1) is maximized. For example, the equivalent effective core cross-sectional area of the optical fiber transmission line is calculated using the above equation (1) for all possible arrangement orders of the optical fibers selected by the optical fiber selection unit 14, and the equivalent effective core cross-sectional area is the maximum. The arrangement order is determined so that When a single optical fiber is selected by the optical fiber selection unit 14 as an optical fiber forming the optical fiber transmission line, the arrangement order is not determined.

When the arrangement order determination unit 16 determines the arrangement order of the selected optical fibers, the information about the selected optical fibers and the arrangement order is output from the optical fiber selection system 10 to the optical fiber connection device 18. , Each of the plurality of optical fibers selected by the optical fiber selection unit 14 follows the arrangement order (the one recorded as electronic data, the one printed out on a paper medium, etc.) determined by the arrangement order determination unit 16, It is connected by the optical fiber connecting device 18 (S16). As a result, an optical fiber transmission line composed of such a plurality of optical fibers is manufactured.

FIG. 7 is a diagram schematically showing the method of manufacturing the optical fiber transmission line according to this embodiment described in detail above.
As shown in FIG. 7, from the plurality of selection candidate optical fibers 20, the plurality of optical fibers 2 forming the optical fiber transmission path are selected.
2 is selected using a genetic algorithm, the arrangement order of the selected optical fibers 22 is determined, and the optical fibers are connected in accordance with the arrangement order, whereby the optical fiber transmission line 24 according to the embodiment of the present invention is selected. Is manufactured.
The optical fiber cable 26 according to the embodiment of the present invention can also be manufactured by bundling and covering one or a plurality of optical fiber transmission lines manufactured in this way.

Next, the operation and effect of the optical fiber selection system according to this embodiment will be described. The optical fiber selection system 10 according to the present embodiment is configured to configure an optical fiber transmission line having a predetermined characteristic from a plurality of selection candidate optical fibers having different characteristics.
Alternatively, when selecting a plurality of optical fibers, the optical fiber selection unit 14 selects an optical fiber using a genetic algorithm. Therefore, compared with the case where the optical fiber is selected by the brute force method, the optical fiber can be selected with an extremely small number of calculations, and compared with the case where the optical fiber is selected by the optimization method such as the common benefit gradient method. do it,
The possibility of falling into a local optimum solution (local minimum) is reduced, and a suitable optical fiber or a combination of optical fibers can be selected throughout. As a result, it becomes possible to efficiently select one or a plurality of optical fibers for forming the optical fiber transmission line. Also,
Since the optical fiber can be efficiently selected, it is possible to reduce the loss of disposal of the optical fiber.

When an optical fiber having a positive wavelength dispersion at the signal light wavelength and an optical fiber having a negative wavelength dispersion at the signal light wavelength are connected to form an optical fiber transmission line, The length ratio of each type of optical fiber must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, in such a case, by selecting an optical fiber by using a genetic algorithm like the optical fiber selection system 10 according to the present embodiment, it is possible to alleviate the difficulty of the optical fiber selection.

In the optical fiber selection system 10 according to the above embodiment, the number of selected optical fibers (the number of connection points) and the selected plurality of optical fibers are selected as the characteristics of the selection candidate optical fiber or the optical fiber transmission line. The fitness E was calculated using each wavelength dispersion, wavelength dispersion of the optical fiber transmission line, and discard length discard length (length), and the optical fiber was selected based on the fitness E. The optical fiber may be selected using the candidate optical fiber or other characteristics of the optical fiber transmission line. Other characteristics include, for example, dispersion slope, effective core area, and transmission loss.

In particular, when an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength are connected to form an optical fiber transmission line, The length ratio of each type of optical fiber must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, in such a case, as in the optical fiber selection system 10 according to the present embodiment,
By selecting an optical fiber using a genetic algorithm, it is possible to alleviate the difficulty of selecting an optical fiber.

Further, in the optical fiber selection system 10 according to the present embodiment, the arrangement sequence determining unit 16 selects each of the plurality of optical fibers selected so that the equivalent effective core cross-sectional area of the optical fiber transmission line becomes maximum. Determine the array order.
Therefore, it is possible to reduce the occurrence of a non-linear phenomenon that adversely affects signal transmission. As a result, it becomes possible to improve the signal transmission efficiency in the optical fiber transmission line.

Further, in the optical fiber selection system 10 according to the present embodiment, the ID (information for specifying the optical fibers) of one or a plurality of optical fibers selected by the optical fiber selection unit 14 and the arrangement order determination unit 16 are determined. The arranged order (information for specifying the arranged order) is referred to as “optical fiber connection instruction sheet”, and the recording medium 2 such as paper as shown in FIG.
8 may be printed out. In this case, the ID of the selected optical fiber, the arrangement order of each optical fiber, and the characteristics of each optical fiber are printed out on the recording medium 28 in a tabular format. Here, the recording medium 2
8 is not limited to a paper medium, and may be an electronic recording medium such as a floppy (registered trademark) disk. By using the recording medium 28 in which the ID of the selected optical fiber and the arrangement order are recorded, it is possible to easily transmit these pieces of information to the third party.

Finally, an optical fiber selection program according to the embodiment of the present invention and a computer-readable recording medium (hereinafter, simply referred to as a recording medium) recording the optical fiber selection program will be described. Here, the recording medium responds to a reading device provided in a computer hardware resource by causing a change state of energy such as magnetism, light, and electricity in accordance with the description content of a program. The description content of the program can be transmitted to the reading device in the form of a signal. As such a recording medium, for example, a magnetic disk, an optical disk, a CD-ROM, a memory built in a computer, or the like is applicable.

FIG. 9 is a block diagram of a recording medium according to the embodiment of the present invention. The recording medium 30 has a program area 30a for recording a program, as shown in FIG. An optical fiber selection program 32 is recorded in the program area 30a. The optical fiber selection program 32 causes the computer to select one or a plurality of optical fibers for configuring an optical fiber transmission line having a predetermined characteristic from a plurality of selection candidate optical fibers having mutually different characteristics. As shown in FIG. 9, which is a selection program, a main module 32a that supervises processing and a plurality of selection candidate optical fibers are
An optical fiber selection module 32b for selecting one or a plurality of optical fibers by using a genetic algorithm, and a computer to execute the optical fiber selection module 32b. When a plurality of optical fibers are selected, the optical fiber transmission is performed. So that the equivalent effective core cross-sectional area of the road is maximized,
An arrangement sequence determination module 32c that determines the arrangement sequence of each of the selected optical fibers is configured. Here, the function realized by operating the optical fiber selection module 32b and the arrangement order determination module 32c is the same as the optical fiber selection system 10 described above.
The functions of the optical fiber selection unit 14 and the arrangement order determination unit 16 are the same. In this case, the optical fiber database 12a stored in the storage unit 12 of the optical fiber selection system 10 may be stored in the data area of the recording medium 30 or may be stored in another recording medium. Is also good.

FIG. 10 is a system configuration diagram of a computer (for example, a server system) for executing the optical fiber selection program 32 recorded in the recording medium 30.
FIG. 11 is a perspective view of a computer for executing the optical fiber selection program 32 recorded in the recording medium 30. As shown in FIGS. 10 and 11, the computer 100 includes a reading device 102 and a work memory (RAM) 10 in which an operating system (OS) is resident.
4, a display 106 as a display unit, a mouse 108 and a keyboard 110 as an input unit, a communication unit 112 as a communication unit, and a CPU 114 for controlling execution of the optical fiber selection program 32 and the like. Here, when the recording medium 30 is inserted into the reading device 102, the information recorded in the recording medium 30 becomes accessible from the reading device 102, and the optical fiber selection program 32 recorded in the program area 30a of the recording medium 30 is displayed. , Can be executed by the computer 100.

As the reading device 102, a flexible disk drive device, a CD-ROM drive device, a magnetic tape drive device or the like is used corresponding to the recording medium 30.

In this case, the plurality of selection candidate optical fibers include both an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength. 1 or so that the optical fiber selection module 32b of the optical fiber selection program 32 includes both an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength. It is also possible to select a plurality of optical fibers.

The plurality of selection candidate optical fibers include both an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength. The optical fiber selection module 32b of the fiber selection program 32 includes one or a plurality of optical fibers so as to include both an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength. It is also possible to select the fiber.

Also, the optical fiber selection program 32
Was recorded on the recording medium 30.
It may be distributed (transmitted) to a personal computer, a workstation or the like via a network.

[0096]

The optical fiber selection system, the optical fiber selection method, the optical fiber transmission path manufacturing method, the optical fiber transmission path, and the optical fiber cable according to the present invention are selected from a plurality of selection candidate optical fibers having different characteristics. When selecting one or a plurality of optical fibers for forming an optical fiber transmission line having predetermined characteristics, an optical fiber is selected using a genetic algorithm. Therefore, compared with the case where the optical fiber is selected by the brute force method, the optical fiber can be selected with an extremely small number of calculations, and compared with the case where the optical fiber is selected by the optimization method such as the common benefit gradient method. Then, the possibility of falling into a local optimum solution (local minimum) is reduced, and a suitable optical fiber or a combination of optical fibers can be selected throughout. As a result, it becomes possible to efficiently select one or a plurality of optical fibers for forming the optical fiber transmission line.

Further, according to the present invention, even when the characteristics of the optical fiber transmission line do not become the arithmetic sum of the characteristics of the plurality of selected optical fibers to be constructed, the characteristics can be predicted and the optimum optical fiber can be selected. It will be possible. In addition, when the selected optical fiber to be configured is divided and cut to form an optical fiber transmission line, even if the characteristics of the divided and cut optical fiber cannot be calculated by a simple proportional division ratio, the characteristics of the divided optical fiber By predicting, it becomes possible to select the optimum optical fiber that constitutes the optical fiber transmission line.

When an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength are connected to form an optical fiber transmission line, The length ratio of each type of optical fiber must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, in such a case, an optical fiber is selected using a genetic algorithm like the optical fiber selection system, the optical fiber selection method, the optical fiber transmission path manufacturing method, the optical fiber transmission path, and the optical fiber cable of the present invention. Therefore, it is possible to alleviate the difficulty of selecting the optical fiber.

Similarly, when an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength are connected to form an optical fiber transmission line, The length ratio of each of the two types of optical fibers must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, in such a case, the optical fiber selection system, the optical fiber selection method, the optical fiber transmission line manufacturing method, the optical fiber transmission line, and
By selecting an optical fiber using a genetic algorithm like an optical fiber cable, it is possible to alleviate the difficulty of selecting an optical fiber.

The optical fiber selection system of the present invention,
In the optical fiber selection method, the optical fiber transmission line manufacturing method, the optical fiber transmission line, and the optical fiber cable, each of the plurality of selected optical fibers is selected so that the equivalent effective core cross-sectional area of the optical fiber transmission line is maximized. By determining the arrangement order, it is possible to reduce the occurrence of non-linear phenomena that adversely affect signal transmission. As a result, it becomes possible to improve the signal transmission efficiency in the optical fiber transmission line.

Further, the optical fiber selection program of the present invention and a computer-readable recording medium having the optical fiber selection program recorded therein cause a computer to execute the program and select among a plurality of selection candidate optical fibers having different characteristics. From the above, when selecting one or a plurality of optical fibers for forming an optical fiber transmission line having a predetermined characteristic, an optical fiber is selected using a genetic algorithm. Therefore, compared with the case where the optical fiber is selected by the brute force method, the optical fiber can be selected with an extremely small number of calculations, and compared with the case where the optical fiber is selected by the optimization method such as the common benefit gradient method. Then, the possibility of falling into a local optimum solution (local minimum) is reduced, and a suitable optical fiber or a combination of optical fibers can be selected throughout.
As a result, it becomes possible to efficiently select one or a plurality of optical fibers for forming the optical fiber transmission line.

When an optical fiber having a positive chromatic dispersion at the signal light wavelength and an optical fiber having a negative chromatic dispersion at the signal light wavelength are connected to form an optical fiber transmission line, The length ratio of each type of optical fiber must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, in such a case, by causing a computer to execute the optical fiber selection program of the present invention and selecting an optical fiber using a genetic algorithm, it is possible to alleviate the difficulty of the optical fiber selection.

Similarly, when an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength are connected to form an optical fiber transmission line, The length ratio of each of the two types of optical fibers must be taken into consideration, and the difficulty of selecting an optical fiber increases. Therefore, in such a case, by causing a computer to execute the optical fiber selection program of the present invention and selecting an optical fiber using a genetic algorithm, it is possible to alleviate the difficulty of the optical fiber selection.

Further, in the optical fiber selection program of the present invention and the computer-readable recording medium in which the optical fiber selection program is recorded, the selection is made so that the equivalent effective core cross-sectional area of the optical fiber transmission line becomes maximum. By determining the arrangement order of each of the plurality of optical fibers, it is possible to reduce the occurrence of a non-linear phenomenon that adversely affects signal transmission. As a result, it becomes possible to improve the signal transmission efficiency in the optical fiber transmission line.

Further, by using the recording medium of the present invention in which the information for specifying the selected optical fiber is recorded, it is possible to easily transmit the information to the third party.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an optical fiber selection system.

FIG. 2 is a configuration diagram of an optical fiber database.

FIG. 3 is a flowchart showing the operation of the optical fiber selection system.

FIG. 4 is a flowchart showing the operation of the optical fiber selection system.

FIG. 5 is a flowchart showing the operation of the optical fiber selection system.

FIG. 6 is a flowchart showing the operation of the optical fiber selection system.

FIG. 7 is a diagram schematically showing a method of manufacturing an optical fiber transmission line.

FIG. 8 is a configuration diagram of a recording medium.

FIG. 9 is a configuration diagram of a recording medium.

FIG. 10 is a system configuration diagram of a computer.

FIG. 11 is a perspective view of a computer.

[Explanation of symbols]

10 ... Optical fiber selection system, 12 ... Storage part, 12a
… Optical fiber database, 14… Optical fiber selector,
16 ... Arrangement order determining unit, 18 ... Optical fiber connecting device, 2
4 ... Optical fiber transmission line, 26 ... Optical fiber cable, 2
8 ... Recording medium, 30 ... Recording medium, 32 ... Optical fiber selection program, 32a ... Main module, 32b ... Optical fiber selection module, 32c ... Array order determination module

Front page continuation (51) Int.Cl. ⁷ Identification symbol FI theme code (reference) // G06N 3/00 550 (72) Inventor Tatsuo Saito 1 Taya-cho, Sakae-ku, Yokohama-shi, Kanagawa Sumitomo Electric Industries, Ltd. Yokohama In-house (72) Inventor Takeshi Kato 1 Taya-cho, Sakae-ku, Yokohama-shi, Kanagawa Sumitomo Electric Industries, Ltd. Yokohama Works (72) Inventor Satoshi Nikaido 1-3-3 Shimaya, Konohana-ku, Osaka, Osaka Sumitomo Electric Information system Co., Ltd. (72) Inventor Takeshi Ueda 4-53-3 Kitahama, Osaka City, Osaka Prefecture Sumitomo Electric Industries, Ltd. Osaka Main Office F-term (reference) 2H038 CA31 5K002 BA03 BA33 FA01 FA02 GA10

Claims (21)

[Claims] 1. An optical fiber selection system for selecting one or a plurality of optical fibers for forming an optical fiber transmission line having a predetermined characteristic from a plurality of selection candidate optical fibers having mutually different characteristics, An optical fiber selection system comprising: a selection unit that selects one or more optical fibers from a plurality of selection candidate optical fibers by using a genetic algorithm. 2. The plurality of selection candidate optical fibers include an optical fiber having a positive chromatic dispersion at a signal light wavelength and an optical fiber having a negative chromatic dispersion at a signal light wavelength. The means selects the plurality of optical fibers so as to include an optical fiber having a positive chromatic dispersion at a signal light wavelength and an optical fiber having a negative chromatic dispersion at a signal light wavelength. The optical fiber selection system described in. 3. The plurality of selection candidate optical fibers include an optical fiber having a positive dispersion slope at a signal light wavelength and an optical fiber having a negative dispersion slope at a signal light wavelength. The means selects the plurality of optical fibers so as to include an optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength. The optical fiber selection system described in. 4. When a plurality of optical fibers are selected by the selecting means, the arrangement order of the selected plurality of optical fibers is determined so that the equivalent effective core cross-sectional area of the optical fiber transmission line is maximized. The optical fiber selection system according to claim 1, further comprising: determining means for performing the selection. 5. An optical fiber selection method for selecting one or a plurality of optical fibers for forming an optical fiber transmission line having a predetermined characteristic from a plurality of selection candidate optical fibers having different characteristics from each other. An optical fiber selection method comprising a selection step of selecting the one or more optical fibers from a plurality of selection candidate optical fibers by using a genetic algorithm. 6. The plurality of selection candidate optical fibers include an optical fiber having a positive chromatic dispersion at a signal light wavelength and an optical fiber having a negative chromatic dispersion at a signal light wavelength. 6. The step comprises selecting the plurality of optical fibers so as to include an optical fiber having a positive chromatic dispersion at a signal light wavelength and an optical fiber having a negative chromatic dispersion at a signal light wavelength. The optical fiber selection method described in. 7. The plurality of selection candidate optical fibers include an optical fiber having a positive dispersion slope at a signal light wavelength and an optical fiber having a negative dispersion slope at a signal light wavelength. The step comprises selecting the plurality of optical fibers to include an optical fiber having a positive dispersion slope at a signal light wavelength and an optical fiber having a negative dispersion slope at a signal light wavelength. The optical fiber selection method described in. 8. When a plurality of optical fibers are selected in the selecting step, the arrangement order of the selected plurality of optical fibers is determined so that the equivalent effective core cross-sectional area of the optical fiber transmission line is maximized. 6. The optical fiber selecting method according to claim 5, further comprising a determining step of: 9. An optical fiber transmission line having predetermined characteristics by selecting a plurality of optical fibers from a plurality of selection candidate optical fibers having different characteristics and connecting the selected plurality of optical fibers to each other. In the method for manufacturing an optical fiber transmission line to be manufactured, a selecting step of selecting the plurality of optical fibers from the plurality of selection candidate optical fibers by using a genetic algorithm, and the plurality of selecting in the selecting step And a connecting step for connecting the optical fibers to each other. 10. The plurality of selection candidate optical fibers include:
An optical fiber having a positive chromatic dispersion at the signal light wavelength,
An optical fiber having a negative wavelength dispersion at the signal light wavelength is included, and the selecting step includes an optical fiber having a positive wavelength dispersion at the signal light wavelength and an optical fiber having a negative wavelength dispersion at the signal light wavelength. 10. The method of manufacturing an optical fiber transmission line according to claim 9, wherein the plurality of optical fibers are selected so as to include. 11. The plurality of selection candidate optical fibers includes:
An optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength are included, and the selection step is an optical fiber having a positive dispersion slope at the signal light wavelength. 10. The method of manufacturing an optical fiber transmission line according to claim 9, wherein the plurality of optical fibers are selected so as to include an optical fiber having a negative dispersion slope at a signal light wavelength. 12. A step of determining the arrangement order of each of the plurality of optical fibers selected in the step of selecting so as to maximize an equivalent effective core cross-sectional area of the optical fiber transmission line, the connecting step 10. The method of manufacturing an optical fiber transmission line according to claim 9, wherein each of the plurality of optical fibers selected in the selecting step is connected according to the arrangement order determined in the determining step. 13. An optical fiber transmission line manufactured by the method for manufacturing an optical fiber transmission line according to any one of claims 9 to 12. 14. An optical fiber cable comprising the optical fiber transmission line according to claim 13. 15. An optical fiber selection program for causing a computer to select one or a plurality of optical fibers for forming an optical fiber transmission line having a predetermined characteristic from a plurality of selection candidate optical fibers having different characteristics. 3. The optical fiber selection program according to claim 1, which causes a computer to perform a selection step of selecting the one or more optical fibers from the plurality of selection candidate optical fibers by using a genetic algorithm. 16. The plurality of selection candidate optical fibers include:
An optical fiber having a positive chromatic dispersion at the signal light wavelength,
An optical fiber having a negative wavelength dispersion at the signal light wavelength is included, and the selecting step includes an optical fiber having a positive wavelength dispersion at the signal light wavelength and an optical fiber having a negative wavelength dispersion at the signal light wavelength. 16. The optical fiber selection program according to claim 15, wherein the plurality of optical fibers are selected so as to include. 17. The plurality of selection candidate optical fibers include:
An optical fiber having a positive dispersion slope at the signal light wavelength and an optical fiber having a negative dispersion slope at the signal light wavelength are included, and the selection step is an optical fiber having a positive dispersion slope at the signal light wavelength. 16. The optical fiber selection program according to claim 15, wherein the plurality of optical fibers are selected so as to include an optical fiber having a negative dispersion slope at a signal light wavelength. 18. A computer, when a plurality of optical fibers are selected in the selecting step, arranges each of the selected plurality of optical fibers so that an equivalent effective core cross-sectional area of the optical fiber transmission line is maximized. The optical fiber selection program according to claim 15, wherein a determining step for determining the order is executed. 19. A computer-readable recording medium on which the optical fiber selection program according to claim 15 is recorded. 20. A recording medium having recorded therein information specifying one or a plurality of optical fibers selected in the optical fiber selection system according to any one of claims 1 to 3. 21. Information specifying one or a plurality of optical fibers selected in the optical fiber selection system according to claim 4, and specifying the arrangement order determined in the optical fiber selection system according to claim 4. A recording medium on which information to be recorded is recorded.