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The statistics of ldquoequivalentrdquo differential phase (EDP) of differential quadrature phase-shift keying (DQPSK) systems is assessed numerically. It is shown that the EDP statistics is approximately Gaussian for a large range of system parameters. Thus, performance evaluation methods based on a Gaussian approximation for the EDP may be used. However, both the mean and variance of the Gaussian...
Key issues related to the design of electro-optic transmitters and receivers are discussed in this paper. These topics include limitations in 100G transmission systems resulting from the frequency response of devices and non-linear effects. Numerical simulations illustrate the importance of realistic modeling in such high-speed systems.
We present a novel constraint-based routing (CBR) algorithm, which accurately estimates linear and nonlinear physical-layer impairments of 43 and 107 Gb/s channels with duobinary and DQPSK modulation formats by combining fast analytical models for assessing the linear transmission impairments with a split-step Fourier approach optimized for computational speed to estimate the nonlinear intra-channel...
In this paper, a GMPLS-controlled all-optical mesh network is demonstrated using a path computation-capable network management system (NMS). The developed NMS can manage topology and physical impairments, and create GMPLS-based lightpaths according to path computation results. Control and management capabilities have been evaluated using all-optical network testbed.
In this paper we review some recent results related to the application of ultra-long Raman fibre laser (URFL) cavities to quasi-lossless optical signal transmission. In an URFL, the transmission fibre itself is contained inside a laser cavity delimited by two fibre Bragg gratings, allowing for a more efficient distribution of the Raman gain to the transmitted signal. We explore the unique properties...
This article addresses the dynamic provisioning of optical connections within a GMPLS-enabled translucent wavelength switched optical network with sparse 3R regenerators. To this end, an OSNR-based IRWA algorithm computes routes that aim at satisfying both restrictions: the wavelength continuity constraint and adequate end-to-end optical signal quality. If either constraint cannot be satisfied, the...
Within this contribution the impact of phase ripples and amplitude filtering induced by fiber Bragg gratings (FBGs) for in-line dispersion compensation in optical long-haul wavelength division multiplex (WDM) transmission systems is investigated. The goal is to evaluate the possibilities and limitations of employing FBGs instead of dispersion compensating fiber (DCF) in modern communication systems...
A numerical method to generate frequency-shaped noise is proposed. Using this method, a model describing the optical noise originated by Raman amplification in optical fibers is presented. The numerical simulations for the amplified spontaneous emission noise power spectrum were corroborated with experimental results.
The increasing demand in the Internet network for real-time multimedia data traffic with high quality is pushing the limits of existing network structure. Optical packet switching (OPS) is considered as an attractive technology for future optical networks. Due to the high transmission capacity, network management is becoming more and more important. In this context, fault identification and performance...
We propose a lightpath establishment technique for transparent optical networks, exploiting the pathcomputationelement (PCE) architecture, which leverages an end-to-end estimation framework called \network krigingrdquo. The scheme relies on the exploitation of probing data from past lightpath establishments to estimate the Quality of Transmission (QoT) of new lightpaths before they are established...
We derive a differential Q factor model for DPSK signals detected by delay line demodulators. The parameters involved in the model are related to signal characteristics such as phase noise linewidth, OSNR and power fluctuations, and can therefore be directly monitored from it. Moreover, its validity is tested and confirmed under various phase noise and amplitude fluctuations scenarios. In addition,...
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