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The ever-increasing demand for capacity in optical networks is driving the development of transponders capable of achieving spectral efficiencies of up to 8 bit/s/Hz using advanced modulation formats and coherent-detection. However, operating at the highest spectral efficiency is accomplished at the expense of shorter transparent reach, potentially requiring the deployment of additional expensive...
We report on the design, fabrication and electro-optical characterization at T = 2.9 K of a photon number resolving detector designed to obtain a pulse-position resolution. This pulse-position-resolving detector (PPRD) is based on the spatial multiplexing of four superconducting nanowire avalanche photodiodes (SNAPs) [8, 9] connected in series. We choose to exploit the 2-SNAP configuration (i.e.,...
Other than merely a bandwidth pipe, current and future network applications will have other requirements such as maximum end-to-end latency and the type of recovery from failure. The added complexity will require a central intelligence such as a software-defined networking (SDN) orchestrator to compute and keep track of the resources allocated to such applications. In such an SDN-orchestrated network,...
In the framework of the EU-funded research project “FABULOUS” we experimentally demonstrate an innovative FDMA-PON architecture whose upstream transmission is based on a reflective Mach-Zehnder modulator, reaching an overall upstream capacity of 32 Gbps per wavelength over 31 dB ODN loss in several previously published experiments targeting 1 Gbps per user and using 16-QAM as a modulation format....
This paper describes the concept of sensor over fibres (SoF), consisting of many sensor heads connected by fibre networks. SoF transfer waveforms from the sensor heads and performs joint signal processing to achieve high-resolution and agile imaging, while wireless sensor networks are digital networks to collect measured data at small sensors. SoF can compile information from sensor heads coherently...
Coherent optical systems offer enhanced possibilities to increase data transmission capacity. To implement these systems, optical demodulators are required to decode the data. In this context, optical demodulators for a Quadrature Phase Shift Keying (QPSK) modulation based on 90° hybrid couplers are presented. The devices were produced by direct UV-laser patterning on sol-gel derived organic-inorganic...
We develop an optical integrated network technology to cope with the rapid traffic fluctuation and the data service diversification. An optical packet and circuit integrated (OPCI) node can provide flexible optical paths for high quality of service, and dynamic optical packets for best-effort service on the same infrastructure. In this paper, we present a compatibility with various optical formats...
We investigate the impact of optical filtering from routing nodes in optical networks, and how to predict it. From measurements in presence of tight optical filtering, we propose a new method relying on an extended back-to-back model for improved prediction of the quality of transmission.
We present an experimental study of the temperature sensitivity of three different step-index 1-mm PMMA fibers. Two of these fibers have a special jacket to sustain high temperatures: BH-4001 and LHXE-4001 and the other is a standard, GH-4001 fiber with a polyethylene jacket. We show that the fibers perform well within the manufacturer specified temperature operating ranges. Predictably, higher than...
We have developed a low complexity machine learning based nonlinear impairment equalization scheme and demonstrated its successful performance in SDM transmission links achieving compensation of both inter- and intra- channel Kerr-based nonlinear effects. The method operates in one sample per symbol and in one computational step. It is adaptive, i.e. it does not require a knowledge of system parameters,...
Beyond 100Gbit/s wireless connectivity is appreciated in many scenarios, such as big data wireless cloud, ultrafast wireless download, large volume data transfer, etc. In this paper, we will present our recent achievements on beyond 100Gbit/s ultrafast terahertz (THz) wireless links enabled by THz photonics.
Setting guard band is an important way to mitigate the physical layer impairments like channel interference and cross-talk interference in Elastic Optical Networks (EONs). The goal of this paper is to study the optimal guard band size against non-linear noise caused by cross channel interferences. Through a classical routing and spectrum assignment algorithm, we investigate the total blocking probability...
In Wavelength Division Multiplexing (WDM) networks, even a single network element failure can cause significant traffic losses due to the disruption of many active data flows. Protection schemes are widely adopted to mitigate the adverse effect brought in by such devastating failures. Particularly challenging is the application of protection schemes to multi-layer networks. In multi-layer networks,...
We propose two new applications of the spectral focusing by self-phase modulation that occurs in a nonlinear optical fiber. We numerically show the possibility of using nonlinear spectral compression to improve the optical signal to noise ratio and mitigate the amplitude jitter of the signal pulses. We also demonstrate experimentally that use of spectral focusing in a combination with an external...
We apply phase modulation techniques at different wavelengths to generate microwave tones that allow us to interrogate multiplexed sensors. The interrogation technique has a resolution far below 1 pm with a simple system and no need of post-processing. This approach relies on basic concepts of microwave photonics technique operating under low coherence regime. A remarkable linear sensitivity of 1...
A transparent and dynamic delivery of mobile front-/back-haul for converged metro/access elastic networking is experimentally demonstrated employing sliceable bandwidth/bitrate variable transceivers based on orthogonal frequency division multiplexing and direct detection. Testbed experiments show successful transmission after 60 km and up to 100 Gb/s data rate.
The usual strategy of augmenting capacity between consecutive generations of DWDM networks by increasing the bit rate per channel is starting to be challenged as theoretical capacity limits are approached. Hence, capacity augmentation alternatives such as using more wavelength bands, exploiting multi-mode fibre transmission and deploying additional fibre pairs or multi-core fibres are being investigated...
Promising far-reaching benefits that will pervade healthcare, industrial automation, autonomous driving, smart grid, and edutainment, the Tactile Internet is envisaged to improve our everyday life. Described as a communications infrastructure that facilitates real-time human-machine interaction through visual, audio, and tactile feedback, anytime and anywhere, its realization hinges upon achieving...
An eight-channel multi-format coherent optical transceiver is proposed as an alternative to implement terabit metro inter-data centre interconnects (DCI) transmitting from 800 to 1600 Gb/s over conventional single mode fibre (CSMF). The maximum reach of the system as a function of transmitted power and overall capacity is numerically estimated for a BER target of 1×10−13, avoiding the use of optical...
In this paper, various trade-offs for the design of short-range optical interconnects for on-board communication in a high-performance computer (HPC) will be discussed. Energy consumption and bandwidth requirements of the components, which are used for the realization of an optical link in future highly adaptive energy-efficient computers, will be estimated based on the energy consumption and bandwidth...
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