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We discuss the capabilities inherent in digital coherent transceivers that make them attractive for core networks. The desirable attributes of these transceivers are presented, from a transmission perspective and from a network perspective, as are future design challenges.
Both bandwidth demand and energy consumption of ICT and communication networks is increasing and optical networks are regarded to provide high bandwidth solutions while enabling more energy efficiency. In this article we give an overview of energy consumption in access and core networks with a focus on optical technologies. Also, possible strategies to enable power reductions are discussed.
The main achievements recently obtained by reflectometric distributed characterization of fiber optic polarization properties are reviewed, with special emphasis on birefringence measurements. Experimental results on polarization effects induced by fiber geometry are also presented.
We study, both theoretically and experimentally, the micro-bending behavior of single-trench-assisted bend-insensitive and large effective-area fibers. We show how the trench significantly reduces the micro-bend losses compared to those of standard step-index profiles of single-mode fibers.
We review recent progress in the areas of silica and compound glass based highly nonlinear fibres, highlighting and contrasting the current start-of-the-art, merits, drawbacks and future potential of both approaches.
We experimentally assess the feasibility of PCE-based path computation for dynamic restoration, and evaluate the impact on the blocking probability, restorability and restoration delay of centralized (i.e., PCE-based) and distributed (i.e., destination-based) wavelength assignment strategies.
The paper addresses concepts of recently implemented optical wireless transmission systems for broadband indoor applications based on infrared radiation as well as visible light. An overview of solutions and achieved performances is given.
This paper describes a novel structure of a graded-index multicore fiber with seven cores arranged in a hexagonal array. Total 70-Gb/s (7×10-Gb/s) is transmitted over a single 100-meter seven-core multimode fiber using tapered multicore fiber connectors and 850nm VCSELs.
We propose a coherent receiver scheme exploiting optical sampling to overcome the speed limitations of electronic analog-to-digital converters. Transmission of 56GBd quadrature phase-shift keying signals over 610km standard single-mode fiber and coherent detection with electronic impairment mitigation is demonstrated.
We develop a simple analytical model that estimates when router bypass by OTN is cost effective. We use realistic metrics from large IP networks to calibrate the model and derive the required router/crossconnect cost ratio for breakeven.
A novel cascaded Mach-Zehnder interferometer configuration is proposed for an adaptive delay DPSK demodulator. We demonstrate that the 2-cascaded MZI configuration can realize three delay settings substantially, and can suppress the penalty caused by bandwidth narrowing at cascaded ROADM filters.
An enhanced version of hardware accelerated QoT estimation tool in impairment-aware optical network is demonstrated and evaluated against the different number of lightpaths and wavelengths per link. It outperforms the software version by 28 times in the order of millisecond.
We report effective all-optical multicast wavelength conversion exploiting cross gain modulation (XGM) in a QD-SOA. 80 Gb/s multi-conversion on four 400 GHz spaced wavelengths is demonstrated with moderate Q2 factor penalty.
An ultra-fast all-optical demultiplexer based on sum-frequency generation in a Periodically-Poled Lithium Niobate waveguide is demonstrated. Error free performance is achieved with respective penalties of 1.5dB and 2dB for 160-to-10Gbit/s and 320-to-10 Gbit/s demultiplexing operations.
An Optical QAM Modulator that employs a single Multi-Electrode MZM and is driven by binary signals is presented. Theoretical performance curves for a square 64-QAM are given. With sufficient number of electrodes, an ideal performance curves can be obtained.
A 26dBm L-Band Lumped Raman Fibre Amplifier based on highly non-linear Ge-doped Photonic Crystal Fiber is reported. The amplifier uses commercially available pump laser diodes, and has a very fast transient suppression time of 10μs.
A scheme to simultaneously realize UWB monocycle pulse generation and frequency up-conversion using FWM effect in a 60-meter HNL-PCF is experimentally demonstrated. Two baseband and two frequency up-converted signals are obtained for UWB-over-fiber systems.
In order to improve the performance of all-optical OFDM systems, we propose an electronic processing technique, which shapes both the spectral profile of the sub-channel signal before demultiplexing and that of the demultiplexer, to achieve near crosstalk- and ISI-free operation.
In a first part of the talk a discussion will be presented about how the laser was conceived and then realized. In the second part, some early developments in laser science and technology, which have paved the way to all nowadays applications, will be reviewed.
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