Highly Reliable Metro-Access Network Based on a Dual-Fiber Ring Architecture and Optimized Protection Mechanisms

Zerui Song,Wei Ji,Rui Yin,Zisu Gong,Jingyao Li,Hao Yun

doi:10.1109/access.2021.3117445

Zerui Song, Wei Ji + Show 4 more

Open Access

https://doi.org/10.1109/access.2021.3117445

Copy DOI

Abstract

Network reliability is very important for the next generation of optical networks. In this paper, a highly reliable protection mechanism, which integrates the approaches of optical protection and microwave protection, is proposed for metro-access optical networks based on the wavelength division multiplexing (WDM) technique. By designing a scheme for the convergence of optical and wireless access and cooperating with designed remote nodes (RNs), not only can access for both wired and wireless service be provided simultaneously in each optical network unit (ONU) but also microwave protection can be realized when a failure occurs in a distribution segment. By developing a novel optical switch module (OSM) to cooperate with the dual-fiber ring structure, flexible switching can be achieved to protect against multiple types of failures in the feeder segment, including single-fiber faults, dual-fiber faults and multifiber faults. Based on the above structure, the influence of Rayleigh backscattering (RB) noise can be mitigated when the network is operating under all operating scenarios except for an inner-fiber fault. To further mitigate the influence of noise, optimization for upstream transmission performance is implemented by configuring a reflective semiconductor optical amplifier (RSOA). Furthermore, the feasibility of the overall scheme is verified through experiments and simulations under different operating conditions. The results show that the proposed mechanisms can achieve acceptable bit error rate performance and quality of service (QoS) metrics while also offering various advantages, including high reliability, large scale, and a relatively low cost.

Highlights

The explosive growth in internet traffic has heightened the need for developing next-generation optical network architecture [1]
2) We develop an optical switch module (OSM) based on realistic components and apply it to ensure the protection of the feeder segment, which can cooperate with the dual-fiber ring structure to defend the feeder segment against multiple failures, including single-fiber faults, dual-fiber faults and multifiber faults
OSM PERFORMANCE The OSM is an important device for realizing fault protection in the network architecture proposed in this paper, and its performance can greatly affect the performance of the entire network

Summary

Introduction

The explosive growth in internet traffic has heightened the need for developing next-generation optical network architecture [1]. Of particular promising and significant consideration is the metro-access optical network, which allows the number of central office (CO) sites per service area to be reduced by combining the characteristics of both metro and access networks in a single network. In this way, can the hierarchical telecom network architecture be simplified, but the operational complexity and cost are reduced [1]-[3]. One of the most significant current concerns in developing nextgeneration optical network architecture is network reliability, and effective protection mechanisms are a key component for a highly reliable network architecture [6], [7].

Objectives

Results

Conclusion