CN111698584A - Routing fiber core frequency spectrum allocation method based on physical damage perception in multi-core fiber - Google Patents

Routing fiber core frequency spectrum allocation method based on physical damage perception in multi-core fiber Download PDF

Info

Publication number
CN111698584A
CN111698584A CN202010505058.7A CN202010505058A CN111698584A CN 111698584 A CN111698584 A CN 111698584A CN 202010505058 A CN202010505058 A CN 202010505058A CN 111698584 A CN111698584 A CN 111698584A
Authority
CN
China
Prior art keywords
spectrum
fiber
core
path
fiber core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010505058.7A
Other languages
Chinese (zh)
Inventor
刘焕淋
熊琪乐
陈勇
任杰
胡会霞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing University of Post and Telecommunications
Original Assignee
Chongqing University of Post and Telecommunications
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing University of Post and Telecommunications filed Critical Chongqing University of Post and Telecommunications
Priority to CN202010505058.7A priority Critical patent/CN111698584A/en
Publication of CN111698584A publication Critical patent/CN111698584A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0213—Groups of channels or wave bands arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0267—Optical signaling or routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0086—Network resource allocation, dimensioning or optimisation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

The invention relates to a routing fiber core frequency spectrum allocation method based on physical damage perception in a multi-core optical fiber, and belongs to the technical field of optical communication. The method selects a path and a fiber core spectrum resource which meet the requirements for the service to be transmitted by adopting a routing fiber core spectrum allocation method based on a dynamic routing strategy and physical damage perception in the multi-core fiber. Firstly, carrying out fiber core grouping and spectrum partitioning to complete initialization; then, in the routing stage, a candidate path is searched for the service to be transmitted by considering a plurality of key attributes such as residual resources, physical hop count, link occupancy rate and the like; in the stage of fiber core and spectrum allocation, a fragment measurement formula which comprehensively considers the influence of crosstalk and nonlinear damage among cores is designed, and the spectrum fragments of a transmission path are reduced; and finally, a physical damage perception algorithm is adopted to uniformly distribute each fiber core in the multi-core optical fiber, so that the resource utilization rate is effectively improved, and the influence of physical damage on optical path transmission is reduced.

Description

Routing fiber core frequency spectrum allocation method based on physical damage perception in multi-core fiber
Technical Field
The invention belongs to the technical field of data communication and optical communication, and relates to a routing fiber core frequency spectrum allocation method based on physical damage perception in a multi-core optical fiber.
Background
The rapidly growing diversity of internet services and multimedia applications such as high definition television, 3-D video on demand, cloud services, and big data, make core network bandwidth demands face serious challenges. A conventional Wavelength Division Multiplexing (WDM) network uses a fixed grid to allocate Wavelength resources, and is not flexible enough when facing emerging services requesting different bandwidth sizes. Elastic Optical Networks (EONs) based on an Optical-Orthogonal Frequency division multiplexing (O-OFDM) technology can flexibly divide subcarriers according to the rate of a service request, and meanwhile, the use of a high-spectrum-efficiency modulation mode further improves the spectrum utilization rate and becomes an emerging Optical backbone network technology with great potential. Space Division Multiplexing (SDM) technology can further expand the capacity of optical Fiber from the physical structure, and Multi-Core Fiber (MCF) becomes a research hotspot because of its mature technology, low implementation difficulty, good transmission effect and other advantages.
The multicore fiber brings the advantages of flexible resource allocation and high bandwidth capacity, but at the same time, due to the increase of devices, the diversity of service types and different requirements on the transmission quality of different services, the transmission system is more complex. When the Bit Error Rate (BER) accumulated on the service transmission path exceeds the transmission quality requirement, the bandwidth blocking Rate will be increased, which affects the successful transmission of the service. In addition, the importance of the resource allocation algorithm is more prominent, and how to effectively and reliably service the service request becomes a research difficulty in reducing the influence of the damage and the crosstalk.
Routing, Spectrum and Core Assignment (RSCA) is a critical issue in optical transmission networks. Core swapping in MCF, after introducing spatial dimensions, complicates the resource allocation problem while mitigating spectral coherence constraints. How to reasonably allocate paths, fiber cores and spectrum resources to service requests becomes important.
In addition, as the transmission network and the optical fiber structure are more and more complex, the physical damage problem is more and more serious, the complex structure brings the advantages of capacity and flexibility, meanwhile, the excessive equipment interfaces inevitably cause signal damage and attenuation in various forms, and the physical damage problem is more prominent along with the further increase of the transmission network distance. The method has important significance in effectively reducing the influence caused by physical damage in a multi-core optical fiber transmission system.
Disclosure of Invention
The invention provides a routing fiber core frequency spectrum allocation method based on physical damage sensing in a multi-core fiber, aiming at the problems of physical damage and routing fiber core frequency spectrum allocation in the multi-core fiber. The method reduces the influence of physical damage and improves the resource utilization rate.
In order to achieve the purpose, the invention provides the following technical scheme:
a routing fiber core frequency spectrum distribution method based on physical damage perception in a multi-core optical fiber comprises the following steps:
s1: according to the multi-core optical fiber core grouping and spectrum partitioning strategy, the initialization of the system is completed;
s2: searching a candidate path set for a service request to be transmitted, and sequencing the candidate paths through a dynamic path routing criterion;
s3: according to the path sequencing result, carrying out fiber core and spectrum distribution on the service to be transmitted, screening and sequencing all available spectrum resources according to a designed improved spectrum fragmentation measurement formula, and selecting the resource with the smallest influence on the system fragmentation degree;
s4: and processing the available spectrum resources according to a physical damage perception algorithm, judging whether the physical damage influence on the transmission system caused after the current spectrum resources are distributed to the service request to be transmitted exceeds a threshold value, and distributing the spectrum resources which do not exceed the threshold value range to the service request to be transmitted.
Further, the specific method of S1 is as follows:
s1: and numbering and dividing non-adjacent fiber cores into a group according to a graph coloring algorithm and the structure and the arrangement sequence of the fiber cores of the multi-core optical fiber. Meanwhile, in order to further reduce the influence of crosstalk between cores, frequency spectrums are partitioned, the number of partitions is equal to the number of groups of fiber cores, key variables c, f and k are initialized, and the value is assigned to 1;
in the stage of network initialization, crosstalk among cores can be avoided by adjusting the sequence and the rule of fiber core and frequency spectrum allocation, the problem of crosstalk among cores can be better avoided under light and medium loads, and the influence of physical damage is reduced from the initialization stage.
And performing core priority grouping operation on the MCF, and distributing adjacent cores to different groups by using a vertex coloring principle to ensure that the cores in each group are not adjacent. The fiber cores of the same group are distributed by a uniform frequency spectrum distribution scheme, because the fiber cores of the same group are not adjacent to each other, ICXT can not be generated in the same group, and the frequency spectrum partitions corresponding to the groups are calculated by executing the following formula among different groups:
Figure BDA0002526245170000021
wherein S isi-1The initial spectrum number for spectrum allocation of the corresponding core in the i-1 th group, where i ∈ (1, S), S is the total group number, S0The first starting spectral number in the core, typically 1. F is the total number of frequency bands in the core, C is the total number of cores in the multicore fiber, GiIs the number of cores in the ith group, G0Is 0.
Further, the specific method of S2 is as follows:
s201: selecting an available candidate path set for the service to be transmitted according to the source and destination of the service request to be transmitted and the network topology condition, if one candidate path can not be found, blocking the service request, and ending all algorithms for the service;
when the ith service request r to be transmittediAnd (s, d and r) when arriving, executing K shortest path algorithms according to the source node s, the destination node d and the network topology structure, presetting K to be 3, and finding a set consisting of K available candidate paths.
S202: and calculating the result of the candidate path set according to the designed dynamic path routing rule, and sequencing and numbering the candidate path set according to a descending rule.
The dynamic path routing criteria are as follows:
Figure BDA0002526245170000031
Figure BDA0002526245170000032
indicates a rate r for a requestiOf the kth candidate path PkThe larger the calculation result value is, the more excellent the comprehensive available resource situation of the current candidate path is. Calculate the request riThe number of spectra required under the current modulation format is fsr。AkIndicating when there is a spectrum resource left,
Figure BDA0002526245170000039
indicates that the request r can be satisfied in the current path kiFs corresponding torThe number of free spectrum blocks.
Figure BDA0002526245170000033
Representing a path of traversal PkNumber of shortest paths of medium link l, NnumIndicating the number of nodes in the network topology,
Figure BDA0002526245170000034
represents a path PkThe number of hops of (a) is,
Figure BDA0002526245170000035
represents a path PkIs calculated by the following equation:
Figure BDA0002526245170000036
Figure BDA0002526245170000037
Figure BDA0002526245170000038
is a Boolean variable, the value is 1 when the fiber core c and the frequency spectrum f are both idle, otherwiseIs 0.
Further, the specific method of S3 is as follows:
s301: selecting candidate paths with smaller numbers from the ordered candidate path set in sequence, and screening fiber core frequency spectrum resources according to the initialization results of fiber core grouping and frequency spectrum partitioning in S1 to find out resources meeting the service request to be transmitted;
the routing fiber core spectrum allocation method generally comprises two stages, firstly, a transmission path is selected for a service request to be transmitted, and after the steps of S201 and S202, the first stage is completed. And in the second stage, fiber core spectrum allocation is carried out, and after a transmission path is selected, whether fiber cores and spectrum resources on the current path can meet various constraints is checked. In order to improve the performance of a transmission system and reduce the influence of physical damage, the invention adds two constraints to the fiber core frequency spectrum allocation process. One is that the problem of spectrum fragmentation of the transmission system needs to be considered when selecting the fiber core and the spectrum resource, and the available resource cannot be used at will. And secondly, in order to reduce the physical damage problem caused by large-capacity long-distance transmission, whether the physical damage threshold value which can be tolerated by a transmission system is exceeded or not needs to be checked during the fiber core and spectrum resource allocation.
S302: and calculating available spectrum resources according to a designed improved spectrum fragment measurement formula, sequencing according to an ascending rule, and preferentially selecting the resources with the smallest influence of the spectrum fragments.
The improved spectrum fragmentation measurement formula designed by the invention is as follows:
Figure BDA0002526245170000041
the above formula calculates the resulting value
Figure BDA0002526245170000042
The larger the current link l is, the more available resources in the fiber core c are, and the spectrum allocation state is good. The first part is estimation of cross channel modulation in NLI, because cross channel modulation is due to mutual interference between occupied frequency slots of the same channel, the occupied frequency spectrum number at the moment is calculated andratio of the total number of spectra. The second part is the number of the idle spectrum blocks which are continuous in the ratio of the residual idle total spectrum number, and the continuity and the availability of the current spectrum resources are improved. Wherein
Figure BDA0002526245170000043
Representing FS in core c of link l, with a value of 1 when it is idle. Gc,lThe sum of the number of consecutive free spectrum blocks in core c of link l. The third part is the estimation of ICXT, omega is the penalty coefficient caused by ICXT problem, the value is 1.2, tau is the number of adjacent fiber cores which can generate ICXT, fadjThe number of frequency slots that will produce crosstalk.
Further, the specific method of S4 is as follows:
s4: and screening the fiber core and the spectrum resources by using a physical damage sensing algorithm, calculating whether physical damage to the transmission system caused after the current resources are occupied by the service request to be transmitted exceeds a threshold range, and if the physical damage exceeds the threshold range, reselecting a new path, the fiber core and the spectrum resources for judgment.
S401: the composition of physical damage is quite complex, but at present, crosstalk and nonlinear damage between cores in the multi-core optical fiber are the main physical damage. The physical damage perception algorithm of the invention also quantitatively analyzes and optimizes the two problems. Firstly, the problem of crosstalk between cores of important physical damage factors in the multi-core optical fiber is checked, and the calculation formula is as follows:
Figure BDA0002526245170000044
Figure BDA0002526245170000045
wherein, k, rx，β，cpRespectively representing the coupling coefficient, bend radius, propagation constant and core pitch. Substituting h into XTNewAnd calculating the average crosstalk borne by a specific fiber core in the MCF, wherein n represents the number of adjacent fiber cores of a certain fiber core, and L represents the transmission length.
XTAdjacent+＝XTNew(8)
XTSelf+＝XTNew(9)
XTNewThe newly generated crosstalk value after the distributed routing fiber core frequency spectrum resource is occupied for the service request to be transmitted, the new addition of the service can generate mutual influence on the resources of the adjacent fiber cores, and the cumulative calculation formula is as follows, wherein XTAdjacentFor cumulative crosstalk value, XT, of adjacent coresSelfThe crosstalk influence accumulated on other frequency spectrum resources of the fiber core by the current service is shown.
XTMax＝max{XTAdjacent,XTSelf} (10)
Finally, find XT by the above calculation formulaAdjacentAnd XTSelfMaximum value XT inMaxComparing with a preset crosstalk threshold when XT is performedMaxIf the value does not exceed the threshold, it indicates that the inter-core crosstalk problem accumulated after the current spectrum resource is allocated to the service to be transmitted is within the acceptable range, and if the value exceeds the threshold, it indicates that the current resource does not meet the physical damage threshold requirement, S3 and the subsequent steps are repeated, and the remaining available paths, fiber cores and spectrum resources are checked until the resource allocation is completed or the service is blocked.
S402: if the calculated value of the crosstalk between the cores does not exceed the threshold value, further checking the nonlinear damage of another important composition factor in the multi-core optical fiber, wherein the calculation formula is as follows:
Figure BDA0002526245170000051
nonlinear damage
Figure BDA0002526245170000052
Can be quantitatively analyzed as service riOn the path PkModel for computation of white gaussian noise on the intermediate link l
Figure BDA0002526245170000053
Subtracting the correction value
Figure BDA0002526245170000054
Wherein the Gaussian white noise model
Figure BDA0002526245170000055
The calculation formula is as follows:
Figure BDA0002526245170000056
Dlis path PkPhysical distance of the intermediate link l, SiIs a set of links l, Pl jPower spectral density, κ, for ith traffic on link li,jFor self-channel modulation and cross-channel modulation between services i, j, when i ═ j, self-channel modulation, κi,jThe calculation formula is as follows:
Figure BDA0002526245170000057
β, which is a direct correlation of the transmission distance, η is the 2 nd order distortion of the fiber,
Figure BDA0002526245170000058
and calculating a hyperbolic function asinh for the bandwidth occupied by the jth service on the link l. Correction values in nonlinear damage equations
Figure BDA0002526245170000059
The calculation formula is as follows:
Figure BDA00025262451700000510
Figure BDA00025262451700000511
in the formula
Figure BDA00025262451700000512
For the modulation format associated with the service i,
Figure BDA00025262451700000513
is the center frequency of traffic j on link l.
S403: when calculating the nonlinear damage value
Figure BDA0002526245170000061
And then comparing the calculated value with a preset nonlinear damage threshold, and when the calculated value of the nonlinear damage does not exceed the corresponding threshold requirement, indicating that the influence of physical damage represented by crosstalk between cores and nonlinear damage generated after the current resource is allocated to the service request to be transmitted on the transmission system is within an acceptable range, and finishing the resource allocation work at this moment. If the nonlinear damage calculation result exceeds the threshold, repeating the step S3 and the subsequent operations until a path fiber core spectrum resource meeting the requirement is found or the current service request is blocked.
The invention has the beneficial effects that:
the invention provides a routing fiber core frequency spectrum allocation method based on physical damage perception in a multi-core fiber, aiming at the problem of physical damage in the multi-core fiber. Firstly, designing a dynamic path routing rule in a routing stage, firstly, carrying out fiber core grouping and spectrum partition operation in an initialization stage, then, searching a candidate path for a service to be transmitted in the routing stage, simultaneously designing the dynamic path routing rule which considers a plurality of key attributes such as real-time residual resources, physical hop count, link occupancy rate and the like, and allocating a physical transmission path for a service request to be transmitted; in the fiber core and frequency spectrum distribution stage, a fragment measurement formula is designed, the influence of crosstalk and nonlinear damage among cores is comprehensively considered, the frequency spectrum fragments of a transmission system are reduced, and finally the load of each fiber core in the multi-core optical fiber is balanced by matching with a physical damage perception algorithm, so that the resource utilization rate is effectively improved, and the influence of physical damage is reduced.
The invention comprehensively considers two aspects of dynamic routing and physical damage, allocates paths, fiber cores and spectrum resources meeting requirements for service requests, reduces the generation probability of spectrum fragments, controls the influence of the physical damage on a transmission system, and has good cost benefit.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention provides the following appendix for illustration:
FIG. 1 is a schematic diagram of a multi-core fiber optic transmission system;
FIG. 2 is a schematic diagram of core grouping and spectral zoning;
FIG. 3 is a schematic view of physical injury;
FIG. 4 is a flow chart of a routing fiber core spectrum allocation method based on physical damage sensing in a multi-core fiber;
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a multi-core Optical Fiber transmission system, in which the diagram includes three transmission nodes a, b, and c, where the node b is a relay node of the nodes a and c, and the diagram expands components in the node b, and mainly includes an upper IP router, a node Bandwidth Variable Transponder (BVT), a Bandwidth Variable Optical Cross Connect (BV-OXC), a Multiplexer/demultiplexer (space division Multiplexing/De-Multiplexing), a multi-core Optical Fiber, and an Erbium Doped Fiber Amplifier (EDFA). As shown in the block in the figure, the optical signal will undergo a certain signal loss or compensation when passing through the node due to the coupling of the above-mentioned devices in the node, where L is the loss and G is the gain.
FIG. 2 shows an example of a method for core grouping and spectral grouping. The figures (a) and (b) are core grouping cross-sections of 7-core and 19-core fibers, respectively, where each circle represents one core in the multicore fiber and different color and dashed line combinations represent different core groupings. The numbers on the cores represent their chosen priority, the cores with the smaller numbers are preferentially chosen and allocated spectrum to service requests. Taking the more complex 19-core fiber shown in the drawing (b) as an example, in order to avoid the influence of the ICXT, when the fiber cores are prioritized, the adjacent cores are distributed in the order as much as possible, in the drawing, the fiber cores 1 to 7 are the first group of non-adjacent fiber cores, and no matter how the spectrum resources are distributed in the same fiber core group, the problem of inter-core crosstalk does not occur, so that the crosstalk can be avoided to the greatest extent according to the current priority distribution when the spectrum is distributed to the service. The remaining 12 cores are inevitably adjacent to the cores in other groups due to the physical structure of the optical fiber, and in order to avoid sequentially allocating adjacent cores as much as possible, the priority of the second group is No. 8-13 cores, and similarly, the third group and the fourth group are 14-16 and 17-19 respectively.
In order to better optimize the crosstalk between cores, different spectrum allocation modes are adopted for different groups on the basis of fiber core grouping, namely, spectrum partitioning is carried out, and each group of fiber cores starts to check and allocate spectrum resources from the head of the corresponding spectrum partition. The number of divisions is calculated according to the formula described in S1. Fig. 1 (c) is a schematic diagram of spectrum partitions of 19-core optical fibers, and as a result of the core grouping of fig. (b), the 19-core optical fibers can be divided into 4 groups in total, so that in the diagram (c), there are four initial positions of spectrum allocation, and according to the standard common in the industry, if the spectrum resources of the entire core are divided by 12.5GHZ, and can be divided into 320 frequency slots in total, then the spectrum partitions of the four core groups are 1, 133, 247, and 304 corresponding to the initial frequency slots in sequence.
Fig. 3 is a schematic diagram of physical damage, which is composed of three transmission nodes, and when a service to be transmitted arrives, the influence of physical damage mainly including crosstalk between cores and nonlinear damage is reduced by analyzing and judging fiber cores and spectrum resources on two links between the three nodes. In the figure, the service to be transmitted needs to occupy 3 basic spectrum units, and if the service is placed on the spectrum resources 3-5 of the fiber core 3, nonlinear damage is generated on all other occupied spectrum resources of the same fiber core, and the influence of inter-core crosstalk is generated at the same spectrum resources with the fiber cores 5, 6 and 7. It can be seen that, in a large-capacity commercial transmission system, when the number of requests to be transmitted is large, the physical damage problem mainly including inter-core crosstalk and nonlinear damage will seriously affect the actual transmission effect, so the physical damage perception algorithm of the invention has considerable practical significance.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.

Claims (4)

1. A routing fiber core frequency spectrum allocation method based on physical damage perception in a multi-core fiber is characterized in that: the method comprises the following steps:
s1: and numbering and grouping the fiber cores in the multi-core optical fiber by using a graph coloring algorithm, and grouping all the fiber cores with the same color marked by the graph coloring algorithm into one group. And then, on the basis of fiber core grouping, carrying out partition operation on the spectrum resources, wherein each fiber core grouping has an independent spectrum partition, and initializing key variables c, f and k, and assigning a value of 1. Setting fiber core and spectrum pre-allocation rules, selecting fiber cores with smaller numbers and belonging to the same group during pre-allocation according to fiber core grouping results, and selecting other grouped fiber cores with the next number if no fiber cores in the same group are left according to the numbering sequence; when spectrum pre-allocation is carried out, available spectrum resources are screened according to partition results and ascending rules, and continuous spectrum resources meeting the service request size are counted and called as spectrum blocks;
s2: searching a candidate path set for a service request to be transmitted, and sequencing the candidate paths by using a dynamic path routing criterion;
s3: according to the path sequencing result, carrying out fiber core and spectrum distribution on the service to be transmitted, screening and sequencing all available spectrum resources according to a designed improved spectrum fragmentation measurement formula, and selecting the resource with the smallest influence on the system fragmentation degree;
s4: and processing the available spectrum resources according to a physical damage perception algorithm, judging whether the physical damage influence on the transmission system caused after the current spectrum resources are distributed to the service request to be transmitted exceeds a threshold value, distributing the spectrum resources which do not exceed the threshold value range to the service request to be transmitted, and outputting a resource distribution result.
2. The method for routing core spectrum allocation based on physical damage sensing in a multicore fiber according to claim 1, wherein: the specific method of S2 is as follows:
s201: selecting an available candidate path set for the service request to be transmitted according to the source destination of the service request to be transmitted and the actual transmission network topology condition, and blocking the service request if one candidate path cannot be found;
s202: calculating the value of each candidate path according to the designed dynamic path routing rule, and sequencing and numbering the candidate path set according to the calculation result and the descending rule, wherein the calculation formula of the dynamic path routing rule is as follows:
Figure FDA0002526245160000011
Figure FDA0002526245160000012
indicates a rate r for a requestiOf the kth candidate path PkThe larger the calculation result value is, the more excellent the comprehensive available resource situation of the current candidate path is. Calculate the request riThe number of spectra required under the current modulation format is fsr。AkIndicating when there is a spectrum resource left,
Figure FDA0002526245160000013
indicates that the request r can be satisfied in the current path kiFs corresponding torThe number of free spectrum blocks.
Figure FDA0002526245160000014
Representing a path of traversal PkNumber of shortest paths of medium link l, NnumIndicating the number of nodes in the network topology,
Figure FDA0002526245160000015
represents a path PkHop count of，
Figure FDA0002526245160000016
Represents a path PkIs calculated by the following equation:
Figure FDA0002526245160000021
Figure FDA0002526245160000022
Figure FDA0002526245160000023
the value of the variable is 1 when the fiber core c and the frequency spectrum f are idle, and is 0 otherwise.
3. The method for routing core spectrum allocation based on physical damage sensing in a multicore fiber according to claim 1, wherein: the specific method of S3 is as follows:
s301: selecting candidate paths with smaller numbers from the ordered candidate path set in sequence, screening fiber cores and spectrum resources according to the initialization result of fiber core grouping and spectrum partition and fiber core and spectrum pre-allocation rules in S1 and according to the ascending order rule of numbers, preferentially selecting available fiber cores and spectrum resource blocks which have smaller numbers and meet the service request to be transmitted from the candidate paths, storing the fiber cores and spectrum blocks into the available resource set, and waiting for subsequent spectrum fragment measurement and allocation;
s302: calculating available spectrum resource blocks on the candidate light path according to a designed spectrum fragment measurement formula, sequencing the available spectrum blocks according to an ascending rule, and preferentially selecting the available spectrum block with the smallest influence of the spectrum fragments, wherein the spectrum fragment formula of a fiber core c of a link l on the candidate path is as follows:
Figure FDA0002526245160000024
the above formula calculates the resulting value
Figure FDA0002526245160000025
The larger the current link l is, the more available resources in the fiber core c are, and the spectrum allocation state is good. The first part is cross channel modulation estimation in NLI, and since cross channel modulation is due to mutual interference between occupied frequency slots of the same channel, the ratio of the occupied frequency spectrum number at the moment to the total frequency spectrum number is calculated. The second part is the number of the idle spectrum blocks which are continuous in the ratio of the residual idle total spectrum number, and the continuity and the availability of the current spectrum resources are improved. Wherein
Figure FDA0002526245160000026
Representing FS in core c of link l, with a value of 1 when it is idle. Gc,lThe sum of the number of consecutive free spectra in core c of link l. The third part is the estimation of ICXT, omega is the penalty coefficient caused by ICXT problem, the value is 1.2, tau is the number of adjacent fiber cores which can generate ICXT, fadjThe number of frequency slots that will produce crosstalk.
4. The method for routing core spectrum allocation based on physical damage sensing in a multicore fiber according to claim 1, wherein: the specific method of S4 is as follows:
s401: firstly, the intercore crosstalk value of a specific fiber core in a selected optical path is calculated according to the coupling coefficient, the bending radius, the transmission distance, the number of the fiber cores, the propagation constant and the core spacing of the multi-core optical fiber.
S402: when the crosstalk value between the cores is larger than the specified crosstalk threshold value, the step S3 is switched to search the available fiber core and the spectrum resource again; otherwise, continuing to execute the following steps to calculate the nonlinear damage value of the optical path:
Figure FDA0002526245160000031
nonlinear damage
Figure FDA0002526245160000032
Can be quantitatively designed as service riOn the path PkModel for computation of white gaussian noise on the intermediate link l
Figure FDA0002526245160000033
Subtracting the correction value
Figure FDA0002526245160000034
S403: when the nonlinear damage threshold of the optical path is not greater than the specified damage threshold, it indicates that the physical damage influence allocated to the optical signal by the selected optical path and the spectrum resource is within the acceptable range, and the optical path selection and the spectrum resource allocation for the service are feasible; outputting the optical path information and the spectral fiber core resource allocation information selected by the service; otherwise, go to step S3 to search for available fiber core and spectrum resource again.
CN202010505058.7A 2020-06-05 2020-06-05 Routing fiber core frequency spectrum allocation method based on physical damage perception in multi-core fiber Pending CN111698584A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010505058.7A CN111698584A (en) 2020-06-05 2020-06-05 Routing fiber core frequency spectrum allocation method based on physical damage perception in multi-core fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010505058.7A CN111698584A (en) 2020-06-05 2020-06-05 Routing fiber core frequency spectrum allocation method based on physical damage perception in multi-core fiber

Publications (1)

Publication Number Publication Date
CN111698584A true CN111698584A (en) 2020-09-22

Family

ID=72479523

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010505058.7A Pending CN111698584A (en) 2020-06-05 2020-06-05 Routing fiber core frequency spectrum allocation method based on physical damage perception in multi-core fiber

Country Status (1)

Country Link
CN (1) CN111698584A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112803996A (en) * 2020-12-30 2021-05-14 中天通信技术有限公司 Method for detecting high nonlinear optical fiber coupling crosstalk
CN113015040A (en) * 2021-03-26 2021-06-22 重庆邮电大学 Resource allocation method based on fragment and domain matching degree in multi-core elastic optical network
CN113099328A (en) * 2021-04-07 2021-07-09 重庆邮电大学 Resource allocation method of multi-core elastic optical network based on node and crosstalk perception
CN113534454A (en) * 2021-07-12 2021-10-22 北京邮电大学 Multi-core optical fiber channel damage equalization method and system
CN115209248A (en) * 2022-07-07 2022-10-18 重庆邮电大学 Method for allocating switchable resources based on crosstalk-aware spectrum in multi-core elastic optical network

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108322392A (en) * 2018-02-05 2018-07-24 重庆邮电大学 The link damage perception efficiency method for routing of Differentiated Services in a kind of elastic optical network
CN110768721A (en) * 2019-11-06 2020-02-07 苏州大学 Resource distribution method in multi-core optical fiber network
CN110769335A (en) * 2019-11-05 2020-02-07 苏州大学 Special protection method and system for multi-fiber core frequency spectrum flexible optical network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108322392A (en) * 2018-02-05 2018-07-24 重庆邮电大学 The link damage perception efficiency method for routing of Differentiated Services in a kind of elastic optical network
CN110769335A (en) * 2019-11-05 2020-02-07 苏州大学 Special protection method and system for multi-fiber core frequency spectrum flexible optical network
CN110768721A (en) * 2019-11-06 2020-02-07 苏州大学 Resource distribution method in multi-core optical fiber network

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
桑丽颖: "基于按需节点结构的空分复用弹性光网络资源调度算法研究", 《重庆邮电大学》 *
熊琪乐: "空分复用弹性光网络中优化物理损伤和能耗的资源调度算法", 《重庆邮电大学》 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112803996A (en) * 2020-12-30 2021-05-14 中天通信技术有限公司 Method for detecting high nonlinear optical fiber coupling crosstalk
CN112803996B (en) * 2020-12-30 2022-03-01 中天通信技术有限公司 Method for detecting high nonlinear optical fiber coupling crosstalk
CN113015040A (en) * 2021-03-26 2021-06-22 重庆邮电大学 Resource allocation method based on fragment and domain matching degree in multi-core elastic optical network
CN113015040B (en) * 2021-03-26 2023-03-14 重庆邮电大学 Resource allocation method based on fragment and domain matching degree in multi-core elastic optical network
CN113099328A (en) * 2021-04-07 2021-07-09 重庆邮电大学 Resource allocation method of multi-core elastic optical network based on node and crosstalk perception
CN113099328B (en) * 2021-04-07 2023-03-14 重庆邮电大学 Resource allocation method of multi-core elastic optical network based on node and crosstalk perception
CN113534454A (en) * 2021-07-12 2021-10-22 北京邮电大学 Multi-core optical fiber channel damage equalization method and system
CN115209248A (en) * 2022-07-07 2022-10-18 重庆邮电大学 Method for allocating switchable resources based on crosstalk-aware spectrum in multi-core elastic optical network

Similar Documents

Publication Publication Date Title
CN111698584A (en) Routing fiber core frequency spectrum allocation method based on physical damage perception in multi-core fiber
CN108834004B (en) Routing calculation, fiber core selection and frequency spectrum allocation method and system based on cross crosstalk perception
CN110035336B (en) Routing fiber core frequency spectrum allocation method of space division multiplexing elastic optical network
Yuan et al. A spectrum assignment algorithm in elastic optical network with minimum sum of weighted resource reductions in all associated paths
EP2571184B1 (en) Allocation of spectral capacity in a wavelength-division multiplexing optical network
CN109995435B (en) Virtual network mapping method and system based on multi-fiber core optical network
Savva et al. Physical layer-aware routing, spectrum, and core allocation in spectrally-spatially flexible optical networks with multicore fibers
CN113489617B (en) Minimum network energy consumption optimization method and system based on traffic grooming
Beyragh et al. IF-RSCA: intelligent fragmentation-aware method for routing, spectrum and core assignment in space division multiplexing elastic optical networks (SDM-EON)
Klinkowski et al. Impact of crosstalk estimation methods on the performance of spectrally and spatially flexible optical networks
CN111866623A (en) High-efficiency virtual optical network survivability mapping method for service reliability
CN109862447B (en) Elastic optical network spectrum allocation method for minimizing total reduction of network idle resources
CN113099328A (en) Resource allocation method of multi-core elastic optical network based on node and crosstalk perception
CN113692058B (en) Satellite Optical Network Spectrum Allocation Method and System Based on Spectrum Resource Evaluation Set
CN113015040B (en) Resource allocation method based on fragment and domain matching degree in multi-core elastic optical network
CN113055767B (en) Routing frequency spectrum allocation method and device based on flexible grid
CN114302267A (en) Special protection spectrum allocation method and system for space division multiplexing optical network of data center
CN108616782A (en) A kind of frequency spectrum distributing method based on the optimization of non-intersecting connection group in elastic optical network
Zhu et al. Service-classified routing, core, and spectrum assignment in spatial division multiplexing elastic optical networks with multicore fiber
CN112995805A (en) Routing and spectrum allocation method based on path idleness in EON
Li et al. A crosstalk-and fragmentation-aware RMSCA strategy in SDM-EONs based on aligned prime-partition of spectrum resources
CN114697775B (en) Virtual optical network mapping method for crosstalk avoidance in heterogeneous multi-core optical fiber elastic optical network
Trindade et al. Core and spectrum allocation for avoidance of spectrum fragmentation in eon-sdm
Lei et al. Crosstalk-aware routing, core, and spectrum assignment with core switching in SDM-EONs
Heera et al. Intelligent RMCSA algorithm for space division multiplexed elastic optical network (SDM-EON)

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20200922