10 Gb/s full-duplex bidirectional transmission with RSOA-based ONU using detuned optical filtering and decision feedback equalization

Omella, M.; Papagiannakis, I.; Schrenk, Bernhard; Klonidis, Dimitrios; Lázaro, José A.; Birbas, Alexios; Kikidis, John; Prat, Josep; Tomkos, Ioannis

doi:10.1364/oe.17.005008

Cited by 57 publications

(11 citation statements)

References 5 publications

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“…Then the US signal passes through an AWG and the subsequent OF for each channel in the OLT. The narrowband OF is detuned slightly from the carrier of the signal to perform the conversion from the unwanted phase modulation due to frequency chirp at the RSOA to the desirable amplitude modulation, with the intention of overcoming the limited bandwidth of the RSOA (1 GHz) [25,26].…”

Section: Network Configurationmentioning

confidence: 99%

Demonstration of a 40 Gb/s Wavelength-Reused WDM-PON Using Coding and Equalization [Invited]

Guo¹,

Tran

2013

J. Opt. Commun. Netw.

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The wavelength-division-multiplexed passive optical network (WDM-PON) has been generally regarded as a promising solution to the next-generation access network that will be required to deliver services over 40 Gb∕s. However, fiber dispersion often limits the capacity and reach of WDM-PONs. Compared with dispersion compensation fiber, which is bulky and expensive with significant power loss, digital signal processing is a more suitable way to mitigate chromatic dispersion in PONs. Furthermore, expense is a critical concern in the WDM-PON, due to its need for a large number of lasers and a complex wavelength control mechanism. One practical solution is to reuse the downstream (DS) signal as the carrier for the upstream (US) modulation. In this case, the residual DS signal after remodulation can seriously degrade US transmission. In addition, system performance can be deteriorated by the unwanted reflection as uplinks and downlinks share one wavelength. In this paper, we propose using modified duobinary (MD) coding in the DS to improve its dispersion tolerance and reduce the crosstalk between DS and US induced by remodulation and reflection. MD is a correlative level code that can reduce signal bandwidth and achieve DC balance. We demonstrate a 15 km WDM-PON delivering a 40 Gb∕s MD-coded signal in the downlink and a 10 Gb∕s on-off keying signal in the uplink. Compared with no coding, the maximal allowable extinction ratio of the DS signal (ER d ) is improved by 4 dB. Moreover, the reflection tolerance of the uplink and downlink is enhanced by 5 and 4 dB, respectively. In addition, investigations on the use of different equalizers in the DS to further suppress fiber dispersion confirm that the superior performance of nonlinear equalization in MD-coded transmission and that the network reach can be extended to 25 km by a nonlinear decision feedback equalizer. Index Terms-Dispersion; Passive optical network (PON); Reflection; Remodulation; Wavelength division multiplexing (WDM).Recently, we proposed the application of a dicode level code, which alters the signal spectrum to have zero content at the direct current (DC), in a wavelength-reused WDM-PON with 10 Gb∕s downlink and 2.5 Gb∕s uplink [15]. The results verify the great ability of dicode coding in suppressing remodulation noise and reflection noise, but the network capacity needs to be further upgraded to meet the rapidly growing bandwidth demand. For a higher transmission rate, such as 40 Gb∕s, the impact of fiber dispersion becomes much more significant and limits the http://dx.

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Section: Network Configurationmentioning

confidence: 99%

Demonstration of a 40 Gb/s Wavelength-Reused WDM-PON Using Coding and Equalization [Invited]

Guo¹,

Tran

2013

J. Opt. Commun. Netw.

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“…The transmission of signals at this data rates through distances in the range of 100 km results in the CD impairment. In this project, two approaches are analysed: compensation of fibre CD by dispersion-compensating fibres located at the CO and by electronic equalisation techniques (Omella et al 2009b). …”

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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“…As RSOA-IMs have the advantages including colourlessness, compactness, low power dissipation, large-scale monolithic integration capability and simultaneous functionalities of signal modulation and amplification [10][11][12][13][14][15], over the past several years, extensive experimental investigations of the performance of RSOA-IM-based OOFDM PONs have been reported using offline DSP, leading to the achievement of 13 Gb/s OOFDM transmissions over 20 km standard single-mode fibres (SSMFs) in wavelength division multiplexing (WDM) OOFDM PONs [16,17].…”

Section: Introductionmentioning

confidence: 99%

13.625 Gb/s real‐time dual‐band adaptive optical orthogonal frequency division multiplexing transmissions over 25 km standard single‐mode fibre intensity modulation and direct detection systems utilising strongly saturated reflective semiconductor optical amplifier intensity modulators

Zhang

Hugues-Salas

Giddings

et al. 2014

IET Optoelectronics

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10 Gb/s full-duplex bidirectional transmission with RSOA-based ONU using detuned optical filtering and decision feedback equalization

Cited by 57 publications

References 5 publications

Demonstration of a 40 Gb/s Wavelength-Reused WDM-PON Using Coding and Equalization [Invited]

Demonstration of a 40 Gb/s Wavelength-Reused WDM-PON Using Coding and Equalization [Invited]

Signal Processing, Management and Monitoring in Transmission Networks

13.625 Gb/s real‐time dual‐band adaptive optical orthogonal frequency division multiplexing transmissions over 25 km standard single‐mode fibre intensity modulation and direct detection systems utilising strongly saturated reflective semiconductor optical amplifier intensity modulators

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