| 1. |
- Tremblay, Christine, et al.
(author)
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Proposed filterless architecture and control plane for emerging flexible coherent networks
- 2013
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In: ICTON 2013. - 9781479906833 ; , s. 1-1
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Conference paper (peer-reviewed)abstract
- Recent developments in coherent modem performance and digital signal processing (DSP) technologies have opened the opportunity for new agile network architectures [1, 2]. The filterless network concept has been proposed in [3] and it is shown that they are more cost-effective and reliable compared to active optical switching networks. Filterless optical networks use broadcast-and-select techniques in which passive non-filtered optical splitters and combiners are used for channel add-drop and fiber link interconnection. Furthermore, DSP-based coherent modems are complementary foundational technologies for flexible optical networking owing to their properties of dynamic impairment compensation, performance monitoring and tuneability. The resulting network architecture makes an attractive candidate solution for flexible optical networking [4]. In this talk, we review the recent progress in filterless optical network design and control [5]ￜ[7]. In the first part, filterless architectural solutions are proposed for different network topologies and compared to active photonic switching solutions. A cost and performance analysis of filterless network solutions with 1 + 1 optical layer protection is also presented. In the second part, we present a control plane for filterless optical networks and describe its main characteristics through a performance study. Our results show that passive filterless networks can be considered as a cost effective and simpler alternative to active optical switching networks whenever traffic loading is not approaching full network capacity.
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| 2. |
- Udalcovs, Aleksejs, et al.
(author)
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Spectral and energy efficiency considerations in mixed-line rate WDM networks with signal quality guarantee
- 2013
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In: ICTON 2013. - 9781479906833 ; , s. 1-7
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Conference paper (peer-reviewed)abstract
- Mixed-Line Rate (MLR) is a cost efficient solution to cope with the rapidly increasing and heterogeneous Internet traffic. In a MLR-based scenario wavelength channels are organized in groups (i.e., sub-bands), each of which consisting of channels operating at the same rate, e.g., it is possible to have on the same fiber link subbands operating at 10 Gbps, 40 Gbps, and 100 Gbps. In order to increase spectral efficiency one can reduce not only the channel spacing within a sub-band but also the frequency spacing between sub-bands operating at different rates, i.e., the sub-band spacing. On the other hand smaller sub-band spacing may: (i) negatively impact the transparent optical reach of wavelength channels due to the higher inter-channel crosstalk levels, and consequently (ii) increase the network power consumption because of the need of more signal regeneration. This paper aims at assessing the trade-off between spectral efficiency and the power consumption in a WDM transport network, when a certain quality of transmission needs to be guaranteed at the receiving node. This is accomplished by evaluating a number of spectral efficient MLR solutions, where the number of wavelength channels allocated to each sub-band is varied while keeping the required Bit Error Rate (BER) level at the receiving node fixed. Results show that the width of each sub-band plays a central role in determining the power consumption of an end-to-end connection.
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| 3. |
- Wiatr, Pawel, 1977-, et al.
(author)
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Energy saving in access networks : Gain or loss from the cost perspective?
- 2013
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In: 2013 15th International Conference on Transparent Optical Networks (ICTON). - : IEEE conference proceedings. - 9781479906833 ; , s. 6603014-
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Conference paper (peer-reviewed)abstract
- Energy consumption in telecommunication networks has become a significant problem during the last few years. Many energy efficient mechanisms have been proposed and evaluated with respect to their impact on the overall network performance (e.g., delay, blocking probability, quality of transmission). Most of these mechanisms are based on the sleep mode functionality, i.e., a "low power" state of network devices that can be utilized in low traffic conditions. On the other hand, a frequent switching between a working and a sleeping state may increase the probability of failures in a device, which in turn makes the operational cost related to fault reparation higher. This paper discusses how sleep mode-based energy saving mechanisms can impact the reliability performance of network equipment by pointing out several physical phenomena that may lead to an increase of the failure rate. In order to quantify such effects we propose a methodology that estimates to what extent energy savings can be maximized without exceeding the extra reparation cost caused by the degradation of the reliability performance of network equipment due to frequent switching on and off. We perform a number of simulative studies focused on an optical access segment and show that the cost saved by reducing the energy consumption (i.e., as the result of a power efficient mechanism) may be easily overcome by the extra expenses related to reparation of network equipment and service interruption for business users.
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| 4. |
- Zengin, Gülis, 1982, et al.
(author)
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Plasmonic nanoantennas for SERS, directional light, sensing and strong coupling
- 2013
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In: International Conference on Transparent Optical Networks. - 2162-7339. - 9781479906833
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Conference paper (peer-reviewed)abstract
- In this paper we discuss several examples of generating directional light emission on a nanoscale as well as utilization of these results for color routing, sensing and strong coupling applications. Examples include propagating plasmons in metallic nanowires, spontaneous formation of optical phase mismatch in materially asymmetric silver-gold and palladium-gold dimers and exciton-induced transparency in individual silver nanorods covered by a thin layer of J-aggregates. © 2013 IEEE.
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