Design of All-Optical Spine-Leaf Data Center Networks with Limited Wavelength Conversion

YANG Kexin; HUANG Tingting; ZHOU Peng; LI Xin; YAN Ying; LI Yongcheng

doi:10.13756/j.gtxyj.2026.240241

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Design of All-Optical Spine-Leaf Data Center Networks with Limited Wavelength Conversion

更新时间：2026-03-03

- Design of All-Optical Spine-Leaf Data Center Networks with Limited Wavelength Conversion
- Study on Optical Communications Issue 1, (2026)
- 作者机构：
  
  1.苏州大学　电子信息学院，江苏　苏州　 215006
  2.苏州鼎芯光电科技有限公司，江苏　苏州　 215006
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2026.240241
  CLC： TN929
- Received：27 November 2024，
  
  Revised：2024-12-10，
  
  Published：10 February 2026
- 稿件说明：
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杨可歆，黄婷婷，周鹏，等. 有限波长转换全光脊叶数据中心网络设计[J]. 光通信研究，2026(1): 240241.

Yang K X, Huang T T, Zhou P, et al. Design of All-Optical Spine-Leaf Data Center Networks with Limited Wavelength Conversion[J]. Study on Optical Communications, 2026(1): 240241.
杨可歆，黄婷婷，周鹏，等. 有限波长转换全光脊叶数据中心网络设计[J]. 光通信研究，2026(1): 240241. DOI： 10.13756/j.gtxyj.2026.240241.

Yang K X, Huang T T, Zhou P, et al. Design of All-Optical Spine-Leaf Data Center Networks with Limited Wavelength Conversion[J]. Study on Optical Communications, 2026(1): 240241. DOI： 10.13756/j.gtxyj.2026.240241.

摘要

目的

全光脊叶（AOSL）数据中心网络（DCN）采用由多级波长选择开关（WSS）级联的架构，波长易在WSS的端口处出现冲突，导致光通道建立失败，从而严重影响了网络的频谱使用效率。为解决这一问题，可以在其脊层WSS的输入端口处放置包含若干个可调谐波长转换器（TWC）的模块，进行任意波长之间的转换，提高网络灵活性。然而，这将导致AOSL DCN的组网成本极大增加。为此，文章希望通过提出有限波长转换AOSL DCN架构在网络性能与组网成本之间找到平衡。

方法

文章提出了两种有限波长转换方案，包括部分端口允许波长转换和部分波长允许转换。其中，部分端口允许波长转换是只在部分脊层WSS前放置TWC模块，且各模块均可实现全波长转换；而部分波长允许转换则在全部脊层WSS前放置TWC模块，且各模块仅允许特定波长转换。此外，文章也针对这两种网络架构的静态光通道业务部署问题，提出了相应的路由、波长和时隙分配（RWTA）算法。

结果

仿真结果表明，文章提出的两种网络架构都能在总业务完成时间（TCT）和总WSS重配次数等方面获得接近具备全波长转换能力的AOSL DCN性能。

结论

文章所提有限波长转换AOSL DCN在降低组网成本的同时有效保障了网络的性能。

Abstract

Objective

The wavelength conflict of different optical channels tends to occur in the All-Optical Spine-Leaf (AOSL) Data Center Network (DCN) that adopts a multi-stage Wavelength Selective Switches (WSS) cascading. This will cause a large number of service requests to be blocked

thus significantly influencing the spectral utilization efficiency of the DCN. To address this issue

Tunable Wavelength Conversion (TWC) modules can be used in the AOSL DCN to enable the conversion of each wavelength to any other wavelength whenever wavelength conflict occurs. However

this will also significantly increase the total cost of the AOSL DCN. Therefore

this paper aims to find a balance between network performance and networking cost by developing the AOSL DCNs with limited wavelength conversion.

Methods

In this paper

we propos two different architectures for the AOSL DCN with limited wavelength conversion

including wavelength conversion allowed on partial WSS and wavelength conversion allowed on specific wavelengths

respectively. The former one deploys the TWC modules with full wavelength conversion capacity

merely for certain spine WSSs. In contrast

the latter one deploys TWC modules that are configured to permit specific wavelength conversion for all of the Spine WSSs. In addition

this paper also proposes corresponding Routing

Wavelength and Time Slot Allocation (RWTA) algorithms for the static lightpath service deployment problem of these two AOSL DCN architectures.

Results

Simulation results show that both network architectures proposed in this paper can achieve performance close to that of the all-optical spine-leaf data center network with full wavelength conversion capabilities in terms of overall Task Completion Time (TCT) and total WSS reconfiguration times.

Conclusion

Our AOSL DCN proposed with limited wavelength conversion effectively guarantees network performance while reducing the networking costs.

关键词

Keywords

references

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