Protection Scheme for a Wavelength-Division-Multiplexed Passive Optical Network Based on Reconfigurable Optical Amplifiers

Abstract

This paper demonstrates a wavelength-division-multiplexed passive optical network (WDM-PON) scheme based on novel reconfigurable optical amplifiers (ROAs). The measured switching characteristics of the ROA3 constructed with a 2 × 2 crossbar optical switch and a four-port reversible optical circulator (OC) and a conventional EDFA can meet the requirements of most network management and surveillance. The self-made four-port reversible OC’s response time is less than 2 ms, and its insertion losses are about 1 dB or less for all the transmission paths and switching states. An optimal design of ROAs is proposed and evaluated for bidirectional optical amplifier protection, in which ROA3 has an EDF length of 7.5 m long with a 1480 nm pump laser and possesses a backward or forward pumping configuration with the corresponding pump power of 200 mW or 50 mW. We verified the scheme’s feasibility through a simulation of WDM-PON systems with 40 downstream and upstream channels. This scheme enables the intelligent protection switching in practical operation scenarios for high-capacity multi-wavelength networks.

SLA-Differentiated Protection in Multi-Band Elastic Optical Networks

“…Thanks to this architecture, instead of offering classical path protection to all connections, we propose to differentiate and offer two different levels of dedicated protection against single failures: EDFA path protection (for "silver" connections) and classical path protection (for "gold" connections). The former only provides survivability against single EDFA failures, but this is the most prevalent cause of failure in transmission networks [4]. In EDFA path protection, the primary and backup lightpaths are established over the same end-to-end path but using the L-band for the primary and the C-band for the backup one (thus, each path uses different amplifiers, and the network is protected against a single EDFA failure).…”

Integrated Fiber-FSO WDM Access System with Fiber Fault Protection

“…Therefore, under high-speed and wide capacity signal transmission in such PON networks, if the connected fiber path is broken, it will affect the network connection of the related end-users. To prevent the occurrence of fiber breakpoint, the self-healing operation in WDM-PON network is also an important research topic [17][18][19][20]. However, the previous works needed to add extra more passive and active devices in the PON architecture to avoid the fiber fault occurrence.…”

Roteamento e Proteção de Recursos em SDM-EON com Ciência da Prioridade de Tráfego

“…Mesmo com os avanc ¸os tecnológicos que têm beneficiado as redes ópticas nos últimos anos, é importante notar que essas redes ainda são sujeitas a falhas, sejam elas causadas por desastres naturais ou ataques criminosos [Rak et al 2021]. Em redes ópticas, as falhas mais comuns são as de corte de fibra, correspondendo a 11.000 FIT 1 a cada 10 km de fibra [Lee et al 2022]. Neste contexto, é primordial o desenvolvimento de mecanismos de resiliência que mantenham a estabilidade da rede em eventos críticos.…”