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In this paper we discuss a simplified model which was derived for homogeneous optical links where all fiber spans are considered identical and its possible exploitation in heterogeneous optical links where the fiber spans can be different. This can be a practical scenario since combinations of different fiber types, i.e. single mode fiber (SMF) and non zero dispersion shifted fiber (NZDSF), are being...
We develop a closed-form expression in order to assess the nonlinear performance of flex-grid optical transmission systems. This simplified expression can estimate the performance of any super-channel of the spectrum allowing its introduction in Routing and Spectrum Assignment (RSA) algorithms which consider physical layer effects. The proposed method can model both uncompensated and dispersion managed...
Four Wave Mixing is the main source of nonlinearity in coherent optical OFDM systems that degrades the system performance. In this paper, based on a previously introduced model, we derive a closed form expression that calculates the FWM power. This model can be used for a fast estimation of system performance within a broad range of system parameters and/or can be also used as an integral part of...
A simplified closed-form expression for the Four Wave Mixing crosstalk is derived. Four Wave Mixing is one of the main sources of performance degradation in coherent optical OFDM systems. This expression is in very good agreement with the exact model over a wide range of system parameters outperforming the previously published model. This model is both simple and at the same time a reliable tool that...
We report a Datacentre system architecture and its performance, that is exploiting PON configurations in the interconnection fabric to play down the role of switching. Advanced transceiver technology is considered that is optimised for balancing performance with cost/power consumption.
The elastic optical networks paradigm offers a competitive solution in terms of resource utilization to cope with the ever-increasing traffic demand. Specifically, the ability to make a number of previously fixed transmission parameters tunable, for example the data rate or channel spacing, requires an evolution of the node architecture. To fully benefit from elasticity, the data plane should evolve...
Next generation access networks are leveraging on the efficiency of fiber access networks to deliver higher data rates in a sustainable manner balancing network deployment costs and the network energy footprint. Towards this direction Passive Optical Networks have been attracting a lot of interest since they can deliver an optimal balance of these two critical factors. However, the transition to next...
We present a novel planning methodology addressing both fixed ITU as well as flexible grid networks. The proposed optimization in conjunction with node clustering is shown to improve energy efficiency and cost of the BT network by about 15%.
SERANO is a novel flexgrid node architecture facilitating on-the-fly reduction in network blocking due to spectral fragmentation while extending the capacity-reach product. We present an analytical method for minimising the number of the main building blocks which are BVTs.
In this paper, the performance of the conventional Decision Feedback (DFE) equalizer as well as the Volterra DFE is investigated in the context of intensity modulated direct detection optical communications links, when non-return to zero on-off keyed (NRZ-OOK) and optical differential encoded phase shift keyed (NRZ-DPSK) transmission is employed. The DFE is used to mitigate either the residual chromatic...
During the last few years, a lot of research has been invested for the development of electronic devices equipped with advanced signal processing techniques for the dispersion compensation of Optical transmission systems. Compared to their all-optical counterparts, electronic compensation increases flexibility and gives a new impetus to transparent optical networks for adaptive and dynamic handling...
The impact of photonics in telecommunications is indisputably massive; however it relies on efficient cost reduction which is in turn only possible if significant cost savings are made at all steps in the development of the photonic device from the material to packaging. The PHOTOPOLIS consortium has identified polymer technology as the ideal solution for producing low-cost devices. The paper aims...
We propose a novel optical cloud architecture where IT and Telecom resources are used interchangeably as common infrastructure. Key assets are the MAC controlled passive networks for distributed multiplexing and grooming and a node architecture integrating transmission and switching.
The continuous evolution in mobile access technologies supporting faster data rates lead to dramatic increases of OPEX backhaul costs. It seems inevitable that the edge of the telecom network will be based on a combination of a wireless part, but also fiber for adequate capacity which is not possible with the wireless infrastructure alone. In this light, PONs offer the significant advantage of cost-effective...
Routing in dynamic future optical networks will depend on the underlying technology and more specifically on whether standard grid or flexi-grid technology will be used. In particular for dynamic flexi-grid networks resource allocation and routing concerns both path establishment and allocation of specific spectrum which in turn relates to the modulation format of the transmitted signals. Moreover...
In this work, two bufferless high capacity broadcast-and-select optical switching node architectures are presented and their performance is evaluated. The architectures are modular permitting the expansion from basic to complex structures by adding new blocks/components in a gradual way, enhancing at the same time the corresponding network functionality. The blocking performance is assessed and scheduling...
Routing in dynamic OFDM-based optical networks by simultaneous optimization of allocated spectrum and transponder reach is proven beneficial when flexi-grid technology is used regarding blocking performance and spectral efficiency when compared to standard-grid counterpart.
Dynamic flexi-grid optical networks are investigated with respect to the path establishment cost and spectrum and modulation format assignment policies. The role of spectral fragmentation with respect to the spectrum granularity and the benefit to distance adaptive OFDM flexi grid networks compared with rigid grid counterparts is established.
As the applications of Wireless Sensor Networks proliferate, security issues raised in this uncontrolled, self-organised systems comprising a large number of nodes with very low processing, buffering and communication capabilities become mandatory as they need to cooperate with each other, even for routing data messages to the desired destination. A solution that has been widely pursued to detect...
The trade-off between algorithmic complexity, physical layer evaluation precision and blocking performance is discussed for four different algorithms and variations in the DT network. Newly developed analytical models for SPM and PMD are used.
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