Multi-core Fiber Resource Allocation Algorithm based on Crosstalk and Fragmentation

YANG Haoyu; REN Danping; DENG Yujing; HU Jinhua; ZHAO Jijun

doi:10.13756/j.gtxyj.2025.240081

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Multi-core Fiber Resource Allocation Algorithm based on Crosstalk and Fragmentation

更新时间：2025-06-18

- Multi-core Fiber Resource Allocation Algorithm based on Crosstalk and Fragmentation
- Study on Optical Communications Issue 3, (2025)
- 作者机构：
  
  a.河北工程大学　信息与电气工程学院，河北　邯郸　 056038
  b.河北工程大学　河北省安防信息感知与处理重点实验室，河北　邯郸　 056038
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2025.240081
  CLC： TN929.11
- Received：23 April 2024，
  
  Revised：05 June 2024，
  
  Published：10 June 2025
- 稿件说明：
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杨昊宇，任丹萍，邓玉静，等. 多芯光纤中基于串扰与碎片化的资源分配算法[J]. 光通信研究，2025(3): 240081.

Yang H Y, Ren D P, Deng Y J, et al. Multi-core Fiber Resource Allocation Algorithm based on Crosstalk and Fragmentation[J]. Study on Optical Communications, 2025(3): 240081.
杨昊宇，任丹萍，邓玉静，等. 多芯光纤中基于串扰与碎片化的资源分配算法[J]. 光通信研究，2025(3): 240081. DOI： 10.13756/j.gtxyj.2025.240081.

Yang H Y, Ren D P, Deng Y J, et al. Multi-core Fiber Resource Allocation Algorithm based on Crosstalk and Fragmentation[J]. Study on Optical Communications, 2025(3): 240081. DOI： 10.13756/j.gtxyj.2025.240081.

摘要

【目的】

多芯光纤（MCF）中最小化芯间串扰（ICXT）将引起网络链路中频谱碎片的增加，从而降低频谱利用率（SU），导致后续业务所需频谱资源不足。对此，文章提出了一种基于串扰和低碎片化（CA-LF）的资源分配算法。

【方法】

在选路阶段，为避免“瓶颈路径”的出现及均衡网络链路中资源的使用，文章基于K-最短路径（KSP）算法，结合路径节点、路径长度和频谱资源的使用情况来改进路径选择策略。在纤芯频谱分配阶段，文章设计了兼顾串扰与碎片化的资源分配方法；以7芯光纤为例，将纤芯分为不相邻纤芯组与相邻纤芯组，之后基于纤芯频谱规整度（CSC）对各组内纤芯降序排列。首先在不考虑ICXT约束的不相邻纤芯组进行资源分配时，通过所提的灵活碎片度量来降低业务拆建中产生的频谱碎片。当不相邻纤芯组内首次出现业务阻塞时，将开始在相邻纤芯组内分配资源进行传输，则该阶段出现考虑ICXT约束的相邻纤芯，此时通过计算频谱块的ICXT-碎片效应值与CSC来确定资源分配位置，以达到均衡串扰与碎片的效果。

【结果】

分别在NSFNET和COST239网络中进行仿真。结果显示，在高网络负载时与对比算法Low-netwXT相比，CA-LF算法在SU方面分别提高了6.5%与5.7%，在网络阻塞率（BBP）和碎片率（SFR）方面分别降低了6.9%、10.8%与9.5%、9.3%。

【结论】

文章所提CA-LF资源分配算法降低了ICXT约束导致的碎片产生，提高了网络资源利用率，同时为处理MCF中ICXT引起的频谱碎片化提供了新方法。

Abstract

【Objective】

Minimizing Inter-Core Crosstalk (ICXT) between cores in Multi-Core Fiber (MCF) will increase spectrum fragmentation in network links

thereby reducing Spectrum Utilization (SU) and resulting in insufficient spectrum resources required for subsequent services. In this paper

a Crosstalk Aware and Low Fragmentation (CA-LF) based resource allocation algorithm is proposed.

【Methods】

In the path selection stage

to avoid the emergence of “bottleneck paths” and balance the use of resources in network links

the K Shortest Paths (KSP) algorithm is used to improve the path selection strategy by combining path nodes

path length and spectrum resource usage. In the core spectrum allocation stage

a resource allocation method that considers crosstalk and fragmentation is designed. Taking a seven-core fiber as an example

its cores are first divided into two groups: a non-adjacent core group and an adjacent core group. Within each group

the cores are then arranged in descending order according to the Core Fiber Spectral Continuity (CSC). Firstly

when allocating resources for non-adjacent core groups without considering crosstalk constraints

the proposed flexible debris metric is used to reduce spectrum debris generated during operational dismantlement and establishment. If a service is blocked for the first time in the non-adjacent core group

it will then be initiated in the adjacent core group. At this stage

adjacent cores with crosstalk constraints come into play. Here

resource allocation is determined by calculating the combined crosstalk-fragmentation effect of the spectrum block and the CSC

thereby achieving a balance between crosstalk and fragmentation.

【Results】

Simulation verification is carried out in NSFNET and COST239 network respectively. The results show that compared with the Low-netwXT algorithm

the CA-LF algorithm improves the SU by 6.5% and 5.7% respectively. The network Blocking Probability (BBP) and Spectrum Fragments Rate (SFR) were reduced by 6.9%

10.8% and 9.5%

9.3% respectively when the network load is high.

【Conclusion】

The CA-LF resource allocation algorithm mentioned in the article reduces the generation of fragmentation caused by crosstalk constraints

improves the utilization rate of network resources

and provides a new method for dealing with spectral fragmentation caused by crosstalk in MCFs.

关键词

Keywords

references

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