Miroslaw Klinkowski

Miroslaw Klinkowski
National Institute of Telecommunications · Transmission and Optical Technology (Z-14)

Associate Professor

About

174
Publications
39,218
Reads
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3,003
Citations
Introduction
I am currently involved in the research on space division multiplexing (SDM) flexible-grid elastic optical networks (EONs).
Additional affiliations
April 2003 - January 2010
Universitat Politècnica de Catalunya
August 1999 - present
National Institute of Telecommunications
Education
April 2003 - February 2008
Universitat Politècnica de Catalunya
Field of study
  • Computer Architecture and Technology
September 1994 - June 1999
Warsaw University of Technology
Field of study
  • Telecommunications

Publications

Publications (174)
Article
Full-text available
The next generation fronthaul interface (NGFI) architecture has been specified recently in the IEEE P1914.1 standard for packet-based fronthaul transport networks. NGFI is a flexible and cost-effective solution developed for meeting stringent latency and throughput requirements of future centralized and virtualized radio access networks (C-RAN/vRAN...
Article
Full-text available
The 5th generation mobile networks (5G) based on virtualized and centralized radio access networks will require cost-effective and flexible solutions for satisfying high-throughput and latency requirements. The next generation fronthaul interface (NGFI) architecture is one of the main candidates to achieve it. In the NGFI architecture, baseband pro...
Article
Full-text available
Open RAN (radio access network) movement is perceived as a game changer, having robust potential to introduce shifts in mobile radio access networks towards tailor-made solutions based on the architecture decomposition. It is widely assumed that those changes will affect the approach to network deployments and supply chains of network elements and...
Article
Full-text available
One of the main challenges in dense 5G radio access networks (RANs) is provisioning of low-cost connectivity between a large number of antennas, located at remote sites, and a central site (hub) in which baseband processing functions are performed. Packet-switched Ethernet and wavelength division multiplexing (WDM) are two principal transport netwo...
Article
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We focus on the optical signal-to-noise ratio (OSNR)-aware optical path (lightpath) planning problem in spectrally and spatially flexible optical networks (SS-FONs) connected using weakly coupled multi-core fibers (MCFs) in which distance-adaptive and super-channel transmission is realized using multiple modulation formats. In the SS-FON considered...
Article
Full-text available
Today, applications can be instantiated in a number of data centers located in different segments of the network, from the core to the edge [...]
Chapter
The following paper considers pattern recognition-aided optimization of complex and relevant problem related to optical networks. For that problem, we propose a four-step dedicated optimization approach that makes use, among others, of a regression method. The main focus of that study is put on the construction of efficient regression model and its...
Article
Full-text available
We consider a dynamic lightpath provisioning problem in translucent spectrally–spatially flexible optical networks (SS-FONs) in which flexible signal regeneration is achieved with transponders operating in back-to-back (B2B) configurations. In the analyzed scenario, an important aspect that has a significant impact on the network performance is the...
Article
We focus on optimization of dynamic spectrally-spatially flexible optical networks (SS-FONs), in which distance-adaptive, spectral super-channel (SCh) transmission is realized over weakly-coupled multi-core fibers (MCFs). In such networks, the inter-core crosstalk (XT) effect in MCFs impairs the quality of transmission (QoT) of optical signals, whi...
Conference Paper
Following work focuses on optimization of dynamic spectrally-spatially flexible optical networks aided using supervised learning methods. Such kind of networks have distance-adaptive, spectral super-channel transmission realized over weakly-coupled multi-core fibers. Article proposes employing a pattern recognition approach with the goal to estimat...
Conference Paper
We focus on spectrally-spatially flexible optical networks and analyze benefits of adjusting the number of active spatial modes in network links using various metrics based on data analytics with the goal to maximize the served traffic.
Conference Paper
Optimization of lightpath provisioning in a spectrally-spatially flexible optical network (SS-FON) is challenging due to many difficult constraints that exist in optical networks and because of limited amounts of various transmission resources (such as spectrum, spatial modes, transceivers, regeneration points). Previously demonstrated approaches u...
Conference Paper
We investigate the blocking performance of a dynamic, spectrally and spatially flexible optical network (SS-FON) in which spectral super-channels (SChs) utilizing multiple modulation formats (MFs) are carried over weakly-coupled multi-core fibers (MCFs) and the amount of transceivers (TRX) in network nodes is limited. In the SS-FON scenario conside...
Article
We focus on the routing, spatial mode, and spectrum allocation (RSSA) problem-a basic optimization problem in spectrally and spatially flexible optical networks (SS-FON). RSSA is a very challenging problem since it introduces a new dimension, related to the selection of spatial resources, to the already complex (NP-hard) routing and spectrum alloca...
Article
We focus on the problem of crosstalk-aware lightpath provisioning in a dynamic, spectrally and spatially flexible optical network, in which spectral super-channels are carried over multi-core fibers with distance-adaptive transmission. The problem involves establishing a lightpath for a connection such that the inter-core crosstalk (XT) between the...
Article
Full-text available
The volume of data traffic in backbone networks is increasing at a speed that exceeds the growth rates of capacities offered in currently used wavelength division multiplex-ing (WDM) networks. As a short term solution to the potential capacity crunch, the concept of flexible-grid elastic optical networks is nowadays implemented in many backbone net...
Conference Paper
In this article, we address the problem of survivable routing in spectrally-spatially flexible optical networks (SS-FONs) with dedicated path protection (DPP). The considered SS-FON supports spectral super-channel transmissions, in which flexible signal regeneration is realized with transceivers operating in back-to-back (B2B) configurations. We pr...
Conference Paper
Full-text available
We focus on a crosstalk-aware lightpath planning problem in a spectrally and spatially flexible optical network (SS-FON) in which spectral super-channels (SChs) are carried over multi-core fibers (MCFs) and distance-adaptive transmission is considered. The problem concerns establishing lightpath connections for a set of traffic demands in such a wa...
Conference Paper
Full-text available
We focus on cross-layer optimization of 5G radio-optical communication networks (5G-RONs) that implement a centralized/cloud radio access network (C-RAN) architecture with the optical fronthaul network assuring the connectivity between remote radio heads (RRHs) and centralized base-band units (BBUs). In particular, we study a 5G-RON planning proble...
Conference Paper
In this paper, we consider spectrally-spatially flexible optical networks (SS-FONs) that combine the concept of space division multiplexing (SDM) and flexible-grid spectrally-flexible (elastic) optical networks (EONs). We assume that SS-FON uses spectral super-channel transmission, in which flexible signal regeneration is realized with transceivers...
Conference Paper
One of the most promising fibers for spatial division multiplexing (SDM) is weakly-coupled multi-core fiber (MCF). Despite significant capacity increase, MCFs suffer from physical layer impairments due to inter-core crosstalk (XT), which is the amount of signal leaking from adjacent cores. In this work, we focus on the impact of worst-case XT of MC...
Conference Paper
Full-text available
Spectrally and spatially flexible optical networks (SS-FONs), which combine space division multiplexing (SDM) with flexible-grid elastic optical network (EON) technologies, bring additional complexity to network control due to the handling of a larger number of spatial modes in SDM than in conventional EONs. To effectively optimize such networks, i...
Article
We focus on dynamic lightpath provisioning in translucent spectrally spatially flexible optical networks (SS-FONs) operating with multi-core fibers and realizing spectral super-channel transmission, in which flexible signal regeneration achieved with transceivers operating in back-to-back (B2B) configurations and modulation conversion is allowed. F...
Conference Paper
We focus on translucent flexgrid optical networks with flexible back-to-back regeneration and analyze the impact of the number of available transceivers on network performance for several proposed transceiver location methods and dynamic routing algorithms.
Conference Paper
Full-text available
Space division multiplexing (SDM) is a promising optical network technology with the scaling potential to overcome the possible capacity crunch problem in backbone networks. SDM enables parallel transmission of several co-propagating spatial modes in suitably designed optical fibers, such as multi-core fibers (MCFs). The MCFs are prone to excessive...
Conference Paper
In this paper, we focus on dynamic lightpath provisioning in translucent elastic optical networks (EONs) realizing super-channel transmission in which flexible signal regeneration achieved with transponders operating in back-to-back (B2B) configurations and modulation conversion is allowed. We study potential power consumption savings and performan...
Article
Full-text available
Space division multiplexing (SDM) is a promising optical network solution with the scaling potential to overcome the possible capacity crunch problem in backbone networks. In SDM optical networks, optical signals are transmitted in parallel through spatial modes co-propagating in suitably designed optical fibers. The combination of SDM with wavelen...
Conference Paper
We examine potential performance gains resulting from a flexible use of signal regeneration achieved by means of transceivers in back-to-back configurations and along with modulation conversion in translucent elastic optical networks (EONs) under dynamic routing.
Chapter
To properly design, operate, and reconfigure elastic optical networks (EONs), the routing and spectrum allocation (RSA) problem must be solved. This chapter reviews several integer linear programming (ILP) formulations of the RSA problem and evaluate their performance regarding the computational time to solve a basic offline problem. It presents a...
Conference Paper
Flexible-grid elastic optical networks (EONs) are expected to substitute in near future fixed-grid wavelength division multiplexing (WDM) optical networks. The previous works that were focused on optimization of EONs take many different assumptions regarding the transmission reach of modulation formats (MFs). However, according to the best of our k...
Conference Paper
Space division multiplexing (SDM) seems to be a promising solution with the scaling potential to overcome the possible capacity crunch problem in optical backbone networks. The main goal of this paper is to provide a detailed analysis of three SDM scenarios, namely, SDM-Fixed, SDM-Single, and SDM-Flexible in terms of the spectrum usage and the wast...
Conference Paper
Space division multiplexing (SDM) is a promising solution with the scaling potential to overcome the possible capacity crunch problem in optical backbone networks. The key idea behind SDM is to exploit the spatial dimension to provide a~significant increase in the transmission system capacity. In SDM, optical signals are transmitted in parallel thr...
Conference Paper
The impact of modulation formats transmission reach on the spectrum usage in Elastic Optical Networks is studied. Results of extensive simulations run on representative network topologies are presented and discussed.
Article
We study potential performance gains resulting from deliberate use of signal regeneration along with modulation and spectrum conversion in translucent elastic optical networks (EONs) realizing super-channel transmission. We analyze three alternative scenarios that differ in the way in which translucent lightpath connections are provisioned. Namely,...
Conference Paper
Due to continuously increasing popularity of various network services the overall Internet traffic grows quickly. According to the recent Visual Networking Index report published by Cisco, the IP traffic will grow at a compound annual growth rate (CAGR) of 22 percent from 2015 to 2020. Space division multiplexing (SDM) in optical networks seems to...
Conference Paper
In this paper, we focus on the routing and spectrum allocation (RSA) problem in survivable elastic optical networks (EONs) with unicast and anycast traffic demands. We study a number of problem versions which differ in the involved technological constraints and facilities entailed by the EON technology, as well as, in the applied protection scheme,...
Article
In this paper, an optimization problem in elastic optical networks (EONs) is considered. The problem concerns routing and spectrum allocation with joint optimization of anycast and unicast demands protected by dedicated optical paths. A new integer linear programming (ILP) problem formulation is presented, which aims at overcoming scalability probl...
Article
We present an optimization procedure that mixes advanced large-scale optimization methods and heuristics to solve large instances (with over 1.7 million integer variables) of the routing and spectrum allocation (RSA) problem - a basic optimization problem in flexgrid elastic optical networks. We formulate the problem as a mixed-integer program for...
Article
Full-text available
In this work, we address the problem of jointly deciding the placement of the contents delivered by a Content Distribution Network (CDN) among the available data centers, together with the allocation of the lightpaths required to serve the anycast demands initiated by the CDN network users, assuming an underlying high-capacity Elastic Optical Netwo...
Conference Paper
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The paper presents a column generation-based method for optimization of routing and spectrum allocation (RSA) in distance-adaptive elastic optical networks (EONs) with anycast and multicast demands. Numerical experiments show the effectiveness of the method.
Conference Paper
Full-text available
The paper presents a column generation-based method for optimization of routing and spectrum allocation (RSA) in distance-adaptive elastic optical networks (EONs) with anycast and multicast demands. Numerical experiments show the effectiveness of the method.
Conference Paper
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In the paper we focus on developing an efficient algorithm capable of producing optimal solutions to the problem of routing and spectrum allocation (RSA) – a basic optimization problem in elastic optical networks. We formulate the problem as a mixed-integer program and we solve it using a branch and price (BP) algorithm. With the aim to improve the...
Article
Full-text available
In this article, we analyze gains resulting from the use of elastic optical network (EON) architectures with special focus on transportation of cloud-ready and content-oriented traffic in the context of network resilience. EONs are a promising approach for future optical transport networks and, apart from improving the network spectral efficiency,...
Conference Paper
Full-text available
In the paper we present a branch and price approach to routing and spectrum allocation – a basic optimization problem in elastic optical networks. We formulate the problem as a mixed-integer program for which we develop a branch and price algorithm enhanced with such techniques as cutting planes for improving lower bounds for the optimal objective...
Conference Paper
Full-text available
Nowadays, multicasting is increasingly popular, due to the ability to provision in efficient way such desirable services like streaming, IP television, software distribution, etc. At the same time, the research in the field of optical networks concentrates on the very promising elastic optical networks (EONs) approach. In this paper, we focus on th...
Article
The fast social and economic development observed in the recent years brings up new challenging optimization problems. These problems are often very hard not only because of their computational complexity, but also due to their enormous solution space size. Therefore, this paper proposes an effective optimization method, based on the novel Multi Po...
Conference Paper
Full-text available
In this paper, an optimization problem in elastic optical networks (EONs) is considered. The problem concerns routing and spectrum allocation with joint optimization of anycast and unicast demands protected by dedicated optical paths. A new integer linear programming (ILP) problem formulation is presented, which aims at overcoming scalability probl...
Conference Paper
Full-text available
The impact of traffic asymmetry on performance of Elastic Optical Networks (EONs) is studied. Results of experiments are presented to show how both symmetric and asymmetric lightpath provisioning scenarios influence spectrum usage and network CAPEX cost.
Article
The paper presents a novel method based on the standard tabu search (TS) approach, dedicated to solve the routing, modulation and spectrum allocation (RMSA) problem in elastic optical networks (EONs). The considered formulation of the RMSA problem covers simultaneously unicast (one-to-one) and anycast (one-to-one-of-many) traffic demands. This is a...
Article
Full-text available
This article shows how recent advances in optical networks can be utilized to improve big data processing by cost effective and scalable provisioning of high-bandwidth connectivity for big data traffic in backbone networks and consequently tackle the current problems related to big data processing in distributed environment including cloud computin...
Article
Full-text available
In dynamic flexgrid optical networks, the usage of capacity may not be optimal due to the permanent process of setting up and tearing down connections, which, if not controlled, leads to spectrum fragmentation and, as a result, to increase of connection blocking. On top of this, a restoration mechanism that is launched in reaction to a link failure...
Article
Full-text available
In this letter, we propose three new approaches to optimizing multicast traffic in Elastic Optical Networks (EONs) that implement distance-adaptive transmission. Two of the approaches are based on Integer Linear Programming (ILP) modeling, while the last one is an effective heuristic. We also compare our approaches with reference methods proposed i...
Conference Paper
Full-text available
Recently, the Content Oriented Networking (CON) has become a recognized approach that is gaining extensive acceptance and deployment. At the same time, Elastic Optical Networks (EONs) are considered as a very promising approach for effective bandwidth allocation in optical networks. In this paper, we consider various approaches to content distribut...
Conference Paper
Full-text available
In this paper, we focus on a survivable elastic optical network (EON) that supports both unicast and anycast traffic demands. The network implements a dedicated path protection scheme (DPP), in which backup lightpaths are assigned to traffic demands so that to protect against single link failures. In a normal network state, each anycast demand is s...
Conference Paper
Full-text available
The paper examines several content distribution scenarios in Elastic Optical Networks (EONs). Numerical experiments are presented to verify the proposed approaches and compare EONs against classical Wavelength Switched Optical Networks (WSONs) in terms of various performance metrics including spectrum, cost and power consumption.
Article
Full-text available
In this paper, we analyze distance-adaptive transmission in cloud-ready elastic optical networks (EONs). To this end, we focus on the routing, modulation and spectrum allocation (RMSA) problem, which we formulate as an integer linear programming (ILP) problem, taking into account such optimization criteria (network performance metrics) as: CAPEX/OP...
Conference Paper
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In this paper, we focus on cloud-ready elastic optical network with distance-adaptive transponders. We analyze the trade-off between number of required regenerators and spectrum usage for a US backbone network with traffic patterns based on Cisco predictions.
Conference Paper
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The impact of traffic asymmetry on usage of multiflow transponders (MFTs) in elastic optical networks with dedicated path protection is examined. Based on experiments performed on European network, acceptable costs of MFTs, with respect to 100G WDM transponders, are evaluated. Introduction The multiflow transponder (MFT), known also as Sliceable Ba...
Conference Paper
Full-text available
We deal with a natural integer-linear programming formulation of the routing and spectrum allocation (RSA) problem in elastic optical networks. We focus on strengthening the formulation with valid inequalities (cuts). For this purpose we apply clique inequalities that proved to be useful in other applications of this kind. We develop and combine a...
Conference Paper
Full-text available
We introduce a mixed-integer optimization model for two-layer IP-over-Flexgrid networks, and present a cost study performed using the CPLEX package for the introduced model. The study concerns a generic German network with 12 nodes and 20 links in the optical layer, and a set of six IP traffic matrices with increasing demand volumes. The optimizati...
Conference Paper
Full-text available
In this paper we present a tabu search-based algorithm, which is dedicated to solving the routing and spectrum allocation problem in elastic optical networks. To evaluate performance of the proposed method, we carry a number of experiments on realistic network topologies. We compare our method with both optimal results yielded by the CPLEX solver a...
Article
Elastic Optical Network (EON) architectures have been recently proposed as a candidate solution for provisioning of both huge bandwidth and flexible connections in next generation optical networks. In this article, we focus on survivable EON scenarios and, in particular, we address an offline problem of routing and spectrum allocation (RSA) with de...
Article
Elastic optical network (EON) architectures are considered as a very promising approach for future optical transport networks, since they efficiently use the spectrum resources and provide high bandwidth scalability and granularity. At the same time, the multicast transmission technique is widely used to provide increasingly popular streaming servi...
Conference Paper
Full-text available
In this paper, we focus on issues related to dynamic routing of anycast and unicast traffic demands in Elastic Optical Networks (EONs). The growing interest in cloud computing and content-oriented services triggers the need to examine anycast traffic in the context of the EON concept, which is perceived as a promising approach for future optical tr...
Conference Paper
Full-text available
Elastic Optical Networks (EONs) are considered as a very promising approach for effective bandwidth allocation in optical networks. Concurrently, anycast (one-to-one-of-many transmission technique) is gaining more and more interest in contemporary Internet due to its connection with as popular services as Content Delivery Networks, video streaming,...
Conference Paper
Full-text available
The impact of anycast and unicast traffic on transponder usage in both symmetric and asymmetric lightpath provisioning scenarios in Elastic Optical Networks is studied. Acceptable costs of multiflow transponders, with respect to 100G WDM transponders, are evaluated.
Conference Paper
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We introduce the problem of reoptimizing the network after a link failure has been repaired as an effective way for reducing capacity usage and improving network performance. Numerical results show gains higher than 42%.
Article
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Finding optimal routes and spectrum allocation in flexgrid optical networks, known as the RSA problem, is an important design problem in transport communication networks. The problem is -hard, and its intractability becomes profound when network instances with several tens of nodes and several hundreds of demands are to be solved to optimum. In ord...
Conference Paper
Full-text available
The paper proposes a Tabu Search algorithm for Routing and Spectrum Allocation with joint unicast and anycast traffic in Elastic Optical Networks (EONs). Numerical experiments are presented to verify the algorithm and show main features of EONs with anycast traffic.