Fast analytical assessment of the signal quality in transparent optical networks

Pachnicke, Stephan; Reichert, J.; Spälter, S.; Voges, E.

doi:10.1109/jlt.2005.862472

Cited by 33 publications

(16 citation statements)

References 14 publications

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“…In our model the dominant degradation effects of ASE-noise, filter crosstalk, XPM and FWM have been included [4] [5]. In our scenario chromatic dispersion (CD) does not impose significant penalties due to the modulation format and the dispersion management described above.…”

Section: Regenerator Placement and Constraint-based Routing Modelmentioning

confidence: 99%

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Physical Impairment Based Regenerator Placement and Routing in Translucent Optical Networks

Pachnicke

Paschenda

Krummrich

2008

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

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A novel constraint-based routing (CBR) algorithm taking into account the dominant linear and nonlinear fiber optical transmission impairments has been analyzed. It is shown that CBR and intelligent regenerator placement decrease the blocking probability significantly. IntroductionIn future transparent optical transmission systems automatic wavelength switching will be introduced (automatically switched optical network, ASON). The rapidly increasing traffic demands require solutions, which reduce the operational expenditure by efficient routing. In the past, opaque (employing optoelectronic conversions at each node), fully-transparent or translucent (with selective regeneration) networks have been investigated. Because of the high cost of optoelectronic conversions and limited reach in fully-transparent networks the translucent topology seems to be the most promising candidate for future wavelength agile longhaul networks.Physical degradation effects such as noise, linear impairments and nonlinear fiber effects affect the signal quality along the transmission path. Depending on the channel load and transmission distance some paths cannot be set up fully transparently because the transmission quality requirements (i.e. pre-FEC bit error ratio (BER) = 10 -9 or Q-factor = 15.56 dB) cannot be fulfilled. In the last couple of years the inclusion of physical layer effects in the network operation and routing has been a topic of intensive research (e.g., [1],[2]). In this paper we propose a combined approach of regenerator placement based on the estimated signal degradation along the links and nodes and constraint-based routing (CBR) to set up paths according to the demands. We show -for the first time to our knowledge -that the combined approach of regenerator placement and routing, both based on physical degradation effects, may significantly decrease the blocking probability in a realistic network scenario with a varying dispersion map and different span lengths. Investigated networkFor the investigations the COST266 reference network (large topology) has been chosen [3]. This network has pan-European dimensions (37 nodes and 57 links) in a mesh topology (Fig. 1, left). System simulations have shown that for very long paths in the COST266 network the nonlinear fiber effects of cross-phase modulation (XPM) and four-wave mixing (FWM) cannot be neglected when 10 Gb/s NRZ-OOK modulation is employed (Fig. 2). This is why we included the analytical models presented in [4] in our CBR approach to assess XPM and FWM. From Fig. 2 an average transparent reach of approximately 1820 km for SSMF can be observed. However, there are short paths with poor signal quality (min. 1280 km) and long paths with good quality (max. 2220 km) making an accurate assessment of the actual signal quality desirable. In the COST266 reference network only link lengths and demands have been defined. For the assessment of the signal quality, however, it is essential to know the physical parameters of the links. For this purpose a heuristic ap...

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Section: Regenerator Placement and Constraint-based Routing Modelmentioning

confidence: 99%

“…2). This is why we included the analytical models presented in [4] in our CBR approach to assess XPM and FWM. From Fig.…”

mentioning

confidence: 99%

Physical Impairment Based Regenerator Placement and Routing in Translucent Optical Networks

Pachnicke

Paschenda

Krummrich

2008

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

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“…The number of channel in each system is 9. The reason for that is found in [21,22]. In each WDM system, DROP channels are transmitted through the fiber-optical link which consists of (1) booster amplifiers with þ 14 dBm output; (2) 80 km of standard SMF, and (3) chromatic dispersion compensation module (DCM) based on fiber Bragg grating (FBG) which compensates the accumulated dispersion (1280 ps/nm).…”

Section: Short Overview Of the Derived Power Consumption Modelmentioning

confidence: 99%

Energy efficiency in WDM fiber-optical links considering OADM/OXC nodes

Udaļcovs

Bobrovs

2016

Optics Communications

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“…We have also investigated the impact of XPM on the performance of a single link considering the analytical model in [11], properly modified to match the specific link architecture. The XPM induced intensity modulation (IM) frequency response is used to obtain an analytic expression for the XPM noise-like variance given by [12]:…”

Section: A Considering Ia-rwa As a Multi-objective Optimization Problemmentioning

confidence: 99%

On the Use of Multi-Objective Optimization Algorithms for Solving the Impairment Aware-RWA Problem

Monoyios

Vlachos

Aggelou

et al. 2009

2009 IEEE International Conference on Communications

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In future transparent optical networks, it is important to consider the impact of physical impairments in the routing and wavelengths assignment process, to achieve efficient connection provisioning. In this paper, we use classical multiobjective optimization (MOO) strategies and particularly genetic algorithms to jointly solve the impairment aware RWA (IA-RWA) problem. Fiber impairments are indirectly considered through the insertion of the path length and the number of common hops in the optimization process. It is shown that blocking is greatly improved, while the obtained solutions truly converge towards the Pareto front that constitutes the set of global optimum solutions. We have evaluated our findings, using an Q estimator tool, that calculates the signal quality of each path analytically. IThis full text paper was peer reviewed at the direction of IEEE Communications Society subject matter experts for publication in the IEEE ICC 2009 proceedings 978-1-4244-3435-0/09/$25.00 ©2009 IEEE

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Fast analytical assessment of the signal quality in transparent optical networks

Cited by 33 publications

References 14 publications

Physical Impairment Based Regenerator Placement and Routing in Translucent Optical Networks

Physical Impairment Based Regenerator Placement and Routing in Translucent Optical Networks

Energy efficiency in WDM fiber-optical links considering OADM/OXC nodes

On the Use of Multi-Objective Optimization Algorithms for Solving the Impairment Aware-RWA Problem

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