Optimization of Rayleigh-Limited WDM-PONs With Reflective ONU by MUX Positioning and Optimal ONU Gain

Lopez, E.; Lazaro, Jose A.; Arellano, C.; Polo, Víctor; Prat, Josep

doi:10.1109/lpt.2009.2035326

Cited by 18 publications

(13 citation statements)

References 6 publications

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“…In this process, the determination of the bias current of the RSOA is critical; it aims to maintain an adequate link gain for upstream transmission and to suppress the downstream data included in the upstream signals. In addition, due to the presence of RB noise, there is an optimal gain of the RSOA that can make the crosstalk-to-signal ratio of the upstream signals reach the maximum value [18], [19]. Hence, to improve the optical transmission performance with the above comprehensive considerations, the configuration of the related parameters will be discussed in detail.…”

Section: Optical Transmission Performancementioning

confidence: 99%

“…Furthermore, some proposed architectures [11], [13], [16] support wavelength remodulation schemes based on reflective semiconductor optical amplifiers (RSOAs) to enhance the wavelength efficiency and achieve colorless ONU, which could be a cost-effective scheme because of the decrease of the construction cost for each ONU and the increase of the usage efficiency of each optical channel. However, the mitigation of Rayleigh backscattering (RB) noise has failed to be considered, which is the dominant factor limiting upstream transmission in an optical network with reflective ONUs [18]- [20]. In addition, none of these schemes perform systematic optimization for upstream transmission performance.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Song¹,

Ji²,

Yin³

et al. 2021

IEEE Access

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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.INDEX TERMS Fiber fault, Metro-access optical network, Reliability, Protection, Wavelength division multiplexing (WDM).

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Section: Optical Transmission Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Song¹,

Ji²,

Yin³

et al. 2021

IEEE Access

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“…In this full-duplex single-fibre bidirectional transmission context, RBS is a dominant impairment. For compensating this impairment, several approaches can be followed: frequency dithering of the optical source at the CO (Lazaro et al 2007b); wavelength shifting or the centralised distributed signal by the ONU (Omella et al 2009a); the analysis the best network design and ONU gain for reducing its impact (Lopez et al 2010). Following this approach, it is possible to analyse the most adequate location of the MUX in the PONs and to determine the optimum ONU gain on each case.…”

Section: Convergence Between Metro and Accessmentioning

confidence: 99%

Signal Processing, Management and Monitoring in Transmission Networks

Vázquez

Montalvo

Ahmed

et al. 2011

Optical Transmission

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1higher, linear and non-linear fibre impairments become prominent factors affecting the signal quality. Thus, new techniques in both physical layer and network layer are necessary for mitigating impairments to accommodate high-speed traffic (Tomkos et al. 2002). On the other hand, the flexibility of modern networks with dynamic and distributed management, where lightpaths can be dynamically and automatically assigned end-to-end, increases the risk of changing path conditions that affect signal quality and consequently quality of service (QoS) over the lifetime of a connection as well as for subsequent connection set-up requests (on-demand routing and wavelength assignment -RWA). For traditional connection provisioning an ideal physical layer, ignoring transmission impairments (Chlamtac et al. 1992) could be assumed because the implicit per hop regeneration (optics-to-electronics-to-optics conversion -O/E/O) compensated signal impairments hop-by-hop in a rather static manner (section commissioning). For end-to-end all-optically switched connections using photonic cross-connect switches (PXC), the conditions change and common practice is not applicable. Anyhow, intelligent connection provisioning is an important traffic engineering problem, and minimising operational cost as well as efficiently utilising network resources is the main driver. In this context, it seems important to have flexible routing protocols that take into consideration the most relevant physical impairments, and are able to exchange messages with their values as part of the route information with others. This condition, if definitely used to calculate routing, will surely assure better success in data delivery over the network (Huang et al. 2005). Irrespective of the control architecture chosen by an operator of an optical network, the included control plane (in charge of setting up and tearing down optical circuits; also known as lightpaths) needs to have a proper set of tools to satisfyingly deal with physical impairments. The most essential tools are: optical signal monitoring, signal processing and impairment compensation techniques (each all-optically and/or electrically). With the help of these tools, it is possible to predict the QoT (quality of transmission) attainable for a lightpath at a given time (i.e. the latest network-wide monitoring instant), and the control plane can route requests across the network

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“…Thus, it would be highly desirable if we could realize the long-reach WDM PON by using RSOAs. However, since the RSOA-based WDM PON typically has a loopback configuration, its performance is vulnerable to the Rayleigh backscattering (RB) [3]- [5]. In particular, if we implement a long-reach RSOA-based WDM PON by using a remote Erbium-doped fiber amplifier (EDFA), its maximum reach can be seriously limited by RB (since it can also be amplified by the remote EDFA).…”

Section: Introductionmentioning

confidence: 99%