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Early Access Articles

Early Access articles are new content made available in advance of the final electronic or print versions and result from IEEE's Preprint or Rapid Post processes. Preprint articles are peer-reviewed but not fully edited. Rapid Post articles are peer-reviewed and edited but not paginated. Both these types of Early Access articles are fully citable from the moment they appear in IEEE Xplore.

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Displaying Results 26 - 50 of 228
  • Transport Network Function Virtualization

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1326 KB)  

    In this paper, we present a Network Function Virtualization (NFV) architecture to deploy different Virtualized Network Functions (VNF) on an optical Transport Network. NFV concepts do not only apply to data plane functions (i.e., packet processing or forwarding), but also to control plane functions, such as path computation. Firstly, we focus on the IT and Network Resources that are virtualized to provide the required VNFs. Secondly, we provide an example of VNF on top of the Virtualized Infrastructure, by proposing a Path Computation Element (PCE) architecture to deploy a PCE by means of NFV. The instances of the virtualized PCE are deployed on demand, but they are perceived as a single network element. We present the benefits of such approach by providing experimental validation. View full abstract»

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  • Malleable Reservation based Bulk-Data Transfer to Recycle Spectrum Fragments in Elastic Optical Networks

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (387 KB)  

    In this paper, we propose to facilitate efficient bulkdata transfer in elastic optical networks (EONs) with malleable reservation (MR). The MR scheme performs adjustable routing and spectrum assignment (RSA) for the data-oriented requests that each has certain amount of data to transfer in an EON, where there also exist flow-oriented requests that each requires a fixed bandwidth. We enable RSA reconfigurations for each dataoriented request served by MR, to effectively recycle the twodimensional (2D) spectrum fragments (i.e., fragments existing in the time and spectrum domains with a correlated manner) generated by the flow-oriented requests. We first formulate a mixed integer linear programming (MILP) model for the MR problem to maximize the percentage of transmitted data using a limited number of RSA reconfigurations. Then, in order to reduce the time complexity, we propose a dynamic programming method (DPM) that can provide the exact solution to the MR problem in polynomial time. Simulation results suggest that compared with the MILP, DPM can provide exact MR solutions for the dataoriented requests with significantly reduced time complexity. The results also verify that without affecting the provisioning of floworiented requests, DPM can recycle 2D spectrum fragments and improve the EON’s spectrum utilization effectively View full abstract»

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  • Ultra-Dense, Single-Wavelength DFT-Spread OFDMA PON with Laserless 1.2 Gb/s ONU Ready for Silicon Photonics Integration

    Publication Year: 2014 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1304 KB)  

    We introduce an ultra-dense network architecture designed for silicon photonics at the ONU. This network relies on only 3.333 GSa/s and 417 MSa/s converters at the OLT and ONU, respectively, and offers up to 12 Gbit/s of symmetric traffic in a single 12.5 GHz optical channel. Multiple access and lowest processing speeds at the ONU are enabled by choosing 10 DFT-spread OFDM subbands. We demonstrate this FDMA network architecture in a proof-of-principle experiment with up to eight 300 MBd 16QAM subbands offering a bidirectional data rate of 9.6 Gbit/s. Real-time signal processing is realized for downstream transmission. Finally, we shortly address future improvements of this network architecture by employing integrated silicon photonics and analog signal processing to enable fine FDM for next-generation access networks. View full abstract»

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  • Multiplexed extrinsic fiber Fabry-Perot interferometric sensors: resolution limits

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (762 KB)  

    Resolution investigation of multiplexed displacement sensors based on extrinsic fiber Fabry-Perot interferometers (EFPI) was carried out. The cases of serial and parallel configurations were considered, the analysis of the problems and the advantages of the both was performed. An analytical model, describing the resolution limits for the both configurations was developed. Serial and parallel multiplexing schemes have been experimentally implemented with 3 and 4 sensing elements, respectively. For the both configurations the achieved optical path difference (OPD) standard deviations were between 30 and 80 pm, which is, to the best of our knowledge, more than an order better than any other multiplexed EFPI resolution ever reported. A good correspondence between experimental results and analytical predictions was demonstrated. A mathematical apparatus, relating the attained sensors resolutions with the number of multiplexed sensors and the optical setup parameters was developed, also demonstrating good correspondence with the experimental results. The main origins of possible sensors cross-talk are described, with the supporting experiments, proving an importance of its consideration. Some recommendations, based on the theoretical analysis and experimental studies, dedicated to optimization of sensors resolution and elimination of the cross-talk influence are provided. View full abstract»

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  • Spatial-Diversity Imaging Receivers for Non-Line-of-Sight Solar-Blind UV Communications

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (534 KB)  

    Optical wireless links in the solar-blind ultraviolet (SB-UV) band transmit data without the need of a line-of-sight through the use of atmospheric scattering. These links have a host of advantages including security, covertness and ease of deployment, however, they inherently suffer large path loss and delay spread due to the underlying atmospheric scattering process. This paper considers the use of spatial degrees of freedom at the receiver to improve the information rates of SBUV channels. Classical scattering link models are extended to provide both temporal and spatial arrival information for scattered photons. A spatio-temporal channel model is developed for SB-UV channels using multi-element imaging receivers. Spatial diversity techniques for delay compensation and detector noise suppression are presented and information rates under equally likely signalling are computed to contrast their performance. In the particular cases considered, the information rate using a spatial diversity receiver is improved approximately 50% over single element receiver channels. View full abstract»

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  • Generalized Maximum Likelihood for Cross-Polarization Modulation Effects Compensation

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (702 KB)  

    We investigate the mitigation of nonlinearities with advanced digital signal processing focusing in particular on cross-polarization effects. Based on a relaxation of an analytical model derived for cross-polarization effects, this paper proposes a novel compensation method called Generalized Maximum Likelihood. It performs a joint blind channel estimation and symbol detection and it additionally accounts for the statistical prior distributions of the cross-polarization crosstalk coefficients. This avoids an overestimation of these crosstalk coefficients. A practical method for both fast computations and optimal performance is then presented, which allows nonlinear compensation for high order modulations. Next, we present Monte-Carlo simulations showing that the proposed algorithm performs close to the theoretical limits. Large performance improvement can be obtained and this is particularly emphasized with higher order modulation such as a 16-ary Quadrature Amplitude Modulation (16QAM). Finally, using Nyquist pulse shaping and polarization division multiplexed with a Quadrature Phase Shift Keying (QPSK) modulation, the experiments are shown to be in accordance with the simulations and show up to 0.7dB improvement in Q-factor for the worst case samples. View full abstract»

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  • Stable multi-wavelength erbium fiber ring laser with optical feedback for remote sensing

    Publication Year: 2014 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (595 KB)  

    In this work, we demonstrate a stable fiber sensing system for remote temperature measurements, where the sensing element is an array of four fiber Bragg gratings (FBGs) and sensor interrogation is achieved with a multi-wavelength erbium fiber ring laser. By introducing a feedback fiber loop in a fiber ring cavity, four laser emission lines were obtained simultaneously in single-longitudinal mode operation (SLM). The power instability obtained was lower than 0.5 dB with an optical signal-to-noise ratio (OSNR) higher than 50 dB for all the emitted wavelengths. The application of this system for remote temperature measurements has been demonstrated even though the SLM regime cannot be preserved. View full abstract»

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  • Wide Dynamic Range Reception of TDM-Based DCO-OFDM Signals Using Optical Domain Power Equalization and Symmetrically Clipping Techniques

    Publication Year: 2014 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1920 KB)  

    This paper proposes the burst-mode reception of DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) signals by introducing symmetrically clipped OFDM and an optical domain power equalizer (OD-PE) consisting of an optical amplifier with feed forward (FF) control. Both the clipping ratio optimization in suppressing the peak-to-average ratio (PAPR) of the OFDM signals and the output power equalization function of the OD-PE regardless of input power level reduce the impact of quantization errors in analogue-to-digital conversion (ADC) needed for digital signal processing (DSP)-based OFDM signal demodulation, which greatly improves the receiver’s dynamic range. Successful reception of 10-Gb/s time division multiplexing (TDM)-based DCO-OFDM signals with wide dynamic range of 13.5 dB is experimentally demonstrated even for a 5-bit resolution ADC, which is typically used for real-time DSPs. Numerical calculations also support the measured results. View full abstract»

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  • Full-Vectorial Analysis of Optical Waveguide Discontinuities Using Denman-Beavers Iterative Scheme

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1148 KB)  

    An accurate and efficient full-vectorial numerical approach for analyzing three-dimensional optical waveguide discontinuities is proposed, where the resulting square root of the characteristic matrix from the field-based operators is approximated by the Denman-Beavers iterative scheme with a branch-cut rotation in the complex plane. Both the magnetic and electric field formulations are rigorously derived along with the robust perfectly matched layer (PML) absorbing boundary conditions. Numerical results from a typical buried waveguide, a channel waveguide, and a rib waveguide show that the present scheme is more accurate and stable than the widely used Padé approximation, while the computational load is comparative. View full abstract»

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  • Torus-topology Data Center Network Based on Optical Packet / Agile Circuit Switching with Intelligent Flow Management

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1375 KB)  

    We review our work on an intra-data center (DC) network based on co-deployment of optical packet switching (OPS) and optical circuit switching (OCS), conducted within the framework of a 5-year-long national R&D program in Japan (~March 2016). For the starter, preceding works relevant to optical switching technologies in intra-DC networks are briefly reviewed. Next, we present the architecture of our torus-topology OPS and agile OCS intra-DC network, together with a new flow management concept, where instantaneous optical path on-demand, so-called Express Path is established. Then, our hybrid optoelectronic packet router (HOPR) which handles 100Gbps (25Gbps x 4-wavelength) optical packets and its enabling device and sub-system technologies are presented. The HOPR aims at a high energy-efficiency of 0.09 [W/Gbps] and low-latency of 100ns regime. Next, we provide the contention resolution strategies in the OPS and agile OCS network and present the performance analysis with the simulation results. It is followed by the discussions on the power consumption of intra-DC networks. We compare the power consumption and the throughput of a conventional fat-tree topology with the N-dimensional torus topology. Finally, for further power saving we propose a new scheme which shuts off HOPR buffers according to the server operation status. View full abstract»

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  • Simultaneous Measurement of Strain and Temperature Using a Single Emission Line

    Publication Year: 2014 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2424 KB)  

    In this work, we present and demonstrate a novel sensor system for simultaneous measurement of strain and temperature through a unique combination of a long period grating (LPG) and a fiber laser based on a fiber Bragg grating (FBG). In order to achieve this, a new erbium doped fiber laser (EDFL) structure is created, showing an optical signal-to-noise ratio (OSNR) of 55 dB and a peak power measured on the OSA between -5 and 0 dBm. The strain and the temperature information can be obtained by using a unique emission line through monitoring both the fiber laser wavelength shift and the change of the power level, both of which showing a clear linear behavior. View full abstract»

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  • The Effect of Source Phase Noise on Stimulated Brillouin Amplification

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (990 KB)  

    The impact of laser phase noise on the Brillouin gain is studied. It is shown that insufficient coherence of the laser sources used in Stimulated Brillouin amplification setups not only leads to reduced gain but also to source-induced gain fluctuations (noise), which may affect their performance. Under commonly encountered conditions, even a relatively coherent source, having a linewidth of a few MHz, has enough phase noise to become the dominant contributor to the observed Brillouin gain fluctuations. For equally phase-noised pump and signal (also called probe), their (separately) induced gain and gain fluctuations are different: (i) The gain penalty is higher for phase-noised pump; (ii) The signal output power is noisier for phase-noised signal, resulting in a larger standard deviation; and (iii) The probability distribution function of the signal output power is quite symmetric for phase-noised pump and distinctively asymmetric for phase-noised signal. The results for continuous pump and signal waves, obtained numerically from the governing differential equations and validated experimentally, may contribute to the judicial choice of laser sources in practical Brillouin-based setups. View full abstract»

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  • Experimental Demonstration of Optical Signal Detection Using Nonlinear Fourier Transform

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (708 KB)  

    The Ablowitz-Ladik - a mathematical tool for calculating the nonlinear Fourier transform (NFT) of a time-domain signal - is applied to coherently detected short 16-GBd BPSK sequences after transmission over a few spans of standard SMF fiber in lab. Decision schemes are investigated which compare the nonlinear spectrum of received signal blocks consisting of a sequence of four BPSK symbols with a set of calculated reference spectra. Decision on the continuous part of the NFT spectrum was successfully demonstrated. At higher signal power performance degradation was linked to peaks in the continuous amplitude spectrum. They are emerging at large signal noise and change depending on the noise seed and lead to an increased variance of the minimum distance criterion which was applied for decision. Decision based on the discrete part of the nonlinear spectrum worked successfully at high signal power. In particular the position of one or more eigenvalues in the complex plane, referred to as eigenvalue pattern, exhibited a low variance for signal with noise and enable low error rate. However, the measurements also show that with increasing signal power, link length, and noise the reliability of the proposed detection is limited and further refinement of decision criteria seems necessary. View full abstract»

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  • LAST: a framework to Localize, Access, Schedule and Transmit in Indoor VLC Systems

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (555 KB)  

    The need allowing indoor access to the Internet services requires to reduce the electromagnetic pollution. Recently, the scientific community is looking for alternatives to the use of radio frequency communication, leading to propose and study the new paradigm of Visible Light Communications. In order to present a system implementing transmission and access procedures, we propose a logical stream starting from user localization, so as to decide which LEDs can provide access, thus basically performing a space division multiple access by scheduling data on the basis of the bits to be transmitted. For this aim, a 2-bands access scheme is proposed and implemented through the use of a separated channel where signaling specifies where, in the wavelength domain, the reception must be operated by the different users. A Multiple Input Multiple Output scheme is considered for data transmission, in order to increase rate with a reliable error rate performance. Performance is evaluated for what concerns localization and access tasks, so as to show the effectiveness of the proposed scheme. Performance comparison with recent literature has been also reported. View full abstract»

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  • Group Delay Control in Longitudinal Offset Coupled Resonator Optical Waveguides

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (129 KB)  

    We study the differential group delay that can be obtained in coupled micro-ring resonator waveguides with longitudinal offset couplers. Various devices based on this effect are proposed and analyzed using a finite-differences time-domain method and their potential applications are discussed. View full abstract»

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  • A Single Wavelength 25Gbps Symmetric FDMA PON

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1174 KB)  

    We demonstrate experimentally a single bidirectional wavelength symmetric capacity of 25Gbps based on FDMA PON architecture using appropriate resources allocation algorithm with 11GHz electrical bandwidth. View full abstract»

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  • A Self-Healing Passive Fiber Bragg Grating Sensor Network

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (666 KB)  

    A self-healing passive fiber Bragg grating (FBG) sensor network (SN) is presented in this paper. The self-healing network consists of a star subnet and a ring subnet. The self-healing ability with single and multiple fiber link failures is theoretically analyzed. In addition, the self-healing function under different network statuses is experimentally demonstrated. A quantitative method for determining the status of FBG sensing signals is presented based on experimental observations, and a threshold of intensity for the FBG sensors in the FBG SN is given. View full abstract»

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  • Experimental study and sensing applications of polarization dependent Lossy Mode Resonances generated by D-shape coated optical fibers

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1745 KB)  

    The fabrication and characterization of an optical fiber refractometer based on Lossy Mode Resonances (LMR) is presented. TiO2/ poly (sodium 4-styrenesulfonate) (PSS) coatings deposited on side-polished D-shaped optical fibers are used as LMR supporting coatings. LMRs are sensitive to the external medium refractive index and D-shaped optical fibers enable the observation of TE and TM LMR polarizations. These refractometers based on TE and TM LMR showed an average sensitivity of 2737 nm/RIU and 2893 nm/RIU respectively for a surrounding medium refractive index (SMRI) range from 1.35 to 1.41. This work also explores the utilization of previously described refractometers in the context of two common industrial applications such as the determination of the sugar content or °Brix in beverages and the salt concentration in sea water. View full abstract»

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  • Han-Kobayashi and Dirty-Paper Coding for Superchannel Optical Communications

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (543 KB)  

    Superchannel transmission is a candidate to realize Tb/s-class high-speed optical communications. In order to achieve higher spectrum efficiency, the channel spacing shall be as narrow as possible. However, densely allocated channels can cause nonnegligible inter-channel interference (ICI) especially when the channel spacing is close to or below the Nyquist bandwidth. In this paper, we consider joint decoding to cancel the ICI in dense superchannel transmission. To further improve the spectrum efficiency, we propose the use of Han–Kobayashi (HK) superposition coding. In addition, for the case when neighboring subchannel transmitters can share data, we introduce dirty–paper coding (DPC) for pre-cancellation of the ICI. We analytically evaluate the potential gains of these methods when ICI is present for sub-Nyquist channel spacing. View full abstract»

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  • GMPLS Control Plane with Distributed Multi-path RMSA for Elastic Optical Networks

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    Elastic optical networking (EON) has the constraint that all flows must have contiguous allocated frequency slots across all fiber links end-to-end, hence, the routing, modulation and spectrum assignment (RMSA) is one of the most important considerations in EON. This paper proposes and demonstrates a design of a generalized multi-protocol label switching (GMPLS) control plane for EON with distributed RMSA. The proposed approach uses an extended RSVP-TE to find multi-path by broadcasting PATH message, using tentative reservation to avoid setting up multi-path for one request. The proposed method also overcomes challenges faced by the previously pursued GMPLSEON methods which relied on dynamic OSPF-TE where control plane overhead and the collision among lightpath requests caused by signaling latency. Simulation results based on the proposed GMPLS-EON method on different network scenarios reveal that our proposed design reduces the blocking probability by 4.56 and 3.86 when compared with the conventional GMPLS and GMPLS/PCE approaches, respectively, in the NSF topology at the network offered load of 60 Erlang. It also reduces signaling time by a factor of 1.84 compared with conventional GMPLS/PCE approach in the same network condition. View full abstract»

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  • Microfiber-Based, Highly-Nonlinear Topological Insulator Photonic Device for the Formation of Versatile Multi-Soliton Patterns in a Fiber Laser

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2936 KB)  

    We reported on the observation of versatile multi-soliton patterns in an erbium-doped fiber (EDF) laser with a microfiber-based topological insulator (TI) photonic device. Taking advantage of both the high third-order nonlinear susceptibility and excellent saturable absorption of TI, various multi-soliton formations such as soliton molecules, bound solitons and soliton rains could be easily obtained at a low pump power. These results might deepen the understanding of nonlinear dynamics of multi-soliton patterns, and further demonstrate that the TI deposited microfiber could operate as a high-performance photonic device with both highly nonlinear effect and saturable absorption for the related optics applications. View full abstract»

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  • Energy Efficient Virtual Network Embedding for Cloud Networks

    Publication Year: 2014 , Page(s): 1
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2668 KB)  

    Network Virtualization is widely considered to be one of the main paradigms for the future Internet architecture as it provides a number of advantages including scalability, on demand allocation of network resources and the promise of efficient use of network resources. In this work, we propose an Energy Efficient Virtual Network Embedding (EEVNE) approach for cloud computing networks where power savings are introduced by consolidating resources in the network and data centers. We model our approach in an IP over WDM network using Mixed Integer Linear Programming (MILP). The performance of the EEVNE approach is compared to two approaches from the literature: the bandwidth cost approach (CostVNE) and the energy aware approach (VNE-EA). The CostVNE approach optimizes the use of available bandwidth while the VNE-EA approach minimizes the power consumption by reducing the number of activated nodes and links without taking into account the granular power consumption of the data centers and the different network devices. The results show that the EEVNE model achieves a maximum power saving of 60% (average 20%) compared to the CostVNE model under an energy inefficient data center power profile. We develop a heuristic, real-time energy optimized VNE (REOViNE), with power savings approaching those of the EEVNE model. We also compare the different approaches adopting an energy efficient data center power profile. Furthermore, we study the impact of delay and node location constraints on the energy efficiency of virtual network embedding. We also show how VNE can impact the design of optimally located data centers for minimal power consumption in cloud networks. Finally, we examine the power savings and spectral efficiency benefits that VNE offers in Optical Orthogonal Division Multiplexing (O-OFDM) networks. View full abstract»

    Open Access
  • Integrated Silicon Photovoltaics on CMOS with MEMS Module for Catheter Tracking

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3738 KB)  

    This work presents an electromagnetic actuation based, optoelectronic active catheter tracking system for magnetic resonance imaging (MRI). The system incorporates a radio frequency (RF) micro electro mechanical system (MEMS) resonator array actuated by the Lorentz force induced due to the strong dc magnetic field available in MRI environment. Power transfer to the system and the actuation detection are done optically via fiber optic cables that replace conventional conductive transmission lines; thereby enabling the tracking system to function safely under MRI. The complementary metaloxide- semiconductor (CMOS) receiver, optically powered by a supply unit housing an on-chip silicon photovoltaic cell, detects the location of the catheter tip. The RF MEMS resonator array transmits the position data by transducing the electrical signal into a resonant mechanical vibration linearly. The optical reading of this actuation can be done by diffraction grating interferometry or laser Doppler vibrometry. The fabricated resonator array is tested with the optically powered CMOS chip (0.18 m UMC technology) in laboratory conditions. The driving electrical current supplied by the chip for resonator actuation is 25 A rms, where the magnetic field provided by the experimental setup is 0.62 T. The resonator array is observed to be functional with real world application by showing a frequency response of 10 dB, which will be enhanced further under the stronger magnetic field available in 3 T MRI. View full abstract»

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  • Twin-Wave Based Optical Transmission with Enhanced Linear and Nonlinear Performances

    Publication Year: 2014 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (449 KB)  

    We review recent progresses on the use of twinwave based diversity schemes to enhance optical transmission performances in both nonlinear and linear regimes. Phaseconjugated twin waves (PCTWs) with and without spectral redundancy are presented. The implications to perturbationbased fiber nonlinearity compensation are discussed. Performance enhancement techniques for real-valued orthogonal frequency-division multiplexed (OFDM) signals with a built-in Hermitian symmetry, as well as positive-valued OFDM twin signals suitable for cost-effective intensity modulation and direct detection, are also discussed. View full abstract»

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  • Transport Network Orchestration for end-to-end Multi-layer Provisioning Across heterogeneous SDN/OpenFlow and GMPLS/PCE Control Domains

    Publication Year: 2015 , Page(s): 1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (967 KB)  

    A multi-domain optical transport network composed of heterogeneous optical transport technologies (e.g., flexi/fixed-grid Optical Circuit Switching and Optical Packet Switching) and control plane technologies (e.g. centralized Open- Flow or distributed GMPLS) does not naturally interoperate, and a network orchestration mechanism is required. A network orchestrator allows the composition of end-to-end network service provisioning across multi-domain optical networks comprising different transport and control plane technologies. Software Defined Networking (SDN) is a key technology to address this requirement, since the separation of control and data planes makes the SDN a suitable candidate for end-to-end provisioning service orchestration across multiple domains with heterogeneous control and transport technologies. This paper presents two different network orchestration’s architectures based on the Application-Based Network Operations (ABNO) which is being defined by IETF based on standard building blocks. Then, we experimentally assesses in the international testbed of the STRAUSS project an ABNO-based network orchestrator for end-to-end multi-layer (OPS and Flexi-grid OCS) and multi-domain provisioning across heterogeneous control domains (SDN/OpenFlow and GMPLS/Stateful PCE) employing dynamic domain abstraction based on virtual node aggregation. View full abstract»

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Aims & Scope

The Journal of Lightwave Technology contains articles on current research, applications and methods used in lightwave technology and fiber optics.

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Meet Our Editors

Editor-in-Chief
Peter J. Winzer
Alcatel-Lucent Bell Labs