Fiber Link Health Detection and Self-Healing Algorithm for Two-Ring-Based RoF Transport Systems.

Wen-Shing Tsai,Tsung-Ying Yang,Ching-Hung Chang,Zhin-Guei Lin,Dong-Yi Lu

doi:10.3390/s19194201

Wen-Shing Tsai, Tsung-Ying Yang + Show 3 more

Open Access

https://doi.org/10.3390/s19194201

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Abstract

A two-ring-based radio over fiber (RoF) transport system with a two-step fiber link failure detection and self-healing algorithm is proposed to ensure quality of service (QoS) by automatically monitoring the health of each fiber link in the transport system and by resourcefully detecting, locating, and bypassing the blocked fiber links. With the assistance of the fiber Bragg grating remote sensing technique, preinstalled optical switches, and novel single-line bidirectional optical add/drop multiplexers, the optical routing pathways in the RoF transport system can be dynamically adjusted by the proposed algorithm when some fiber links are broken. Simulation results show that except in some extreme situations, the proposed algorithm can find the blocked fiber links in the RoF transport system and animatedly adjust the status of preinstalled optical switches to restore all blocked network connections, thereby ensuring QoS in the proposed RoF transport system.

Highlights

Radio over fiber (RoF) transport systems have been developed to support broadband wireless communication technologies, such as 5G and WiGig
To contribute to the extant knowledge in this field, we develop a two-ring-based
RoF transport system based on a self-developed single-line bidirectional OADMs (SBOADMs) and a two-step fiber link failure detection and self-healing algorithm

Summary

Introduction

Radio over fiber (RoF) transport systems have been developed to support broadband wireless communication technologies, such as 5G and WiGig. If the ring-topology comprises a traditional optical add/drop multiplexer (OADM) [7,8], the transport system may be unable to exercise its self-healing function when a fiber link failure is present because both the added and passed optical signals in an OADM are transmitted in the same direction of the fiber ring [9]. To overcome such drawback, several single-line bidirectional OADMs (SBOADMs) [7,10,11] are developed based on optical multiplexer/de-multiplexer, multiport optical circulators (OCs), optical switches (SW), fiber Bragg gratings (FBGs), or optical amplifiers. Unlike other embedded self-healing architectures [6,20,21,22,23,24,25,26] that lack any algorithm or method for determining the breakpoint location, the proposed algorithm can locate two breakpoints and bypass the failure fiber links by adjusting the status of the pre-installed SWs in the proposed network

Materials and Methods

First Detection Step of the Proposed Algorithm

Second Detection Step of the Proposed Algorithm

Conclusions