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In this contribution a multiwavelength erbium ring laser is presented. The multiwavelength operation isachievedby using a novel in-line Mach-Zehnder (MZ) fibre interferometer based on multicore microstructured fibre (MC-MOF).The MZ interferometer acts as a periodic spectral filter. The modal properties of the MC-MOF are analysed using the finite difference method. Dual wavelength operation is demonstrated...
Modern technologies requires thin films for different applications. Thin film materials are important elements of technological progress made in the fields of optoelectronic, photonic, photovoltaic and magnetic devices. The processing of materials into thin films allows easy integration into various types of devices. The properties of material significantly differ when studied in the form of thin...
Application of various types Cu/Low-k materials improve on CMOS FPGA structure a quality of high-speed data transferred between all of their embedded parts. An effective combination of the specialized fast interconnections and high performance logic elements introduces the possibility of implementation in these structures a high-resolution delay cells. The delay cells temperature parameters strongly...
An electromagnetic wavelength-scale numerical analysis of optical characteristics of multinanolayer photovoltaic (PV) cells based on Si p-i-n type absorber with non-periodic (chirped) distributed Bragg reflector (DBR) on the top of the structure mounted on a metallic layer and SiO2 substrate is performed. Computer modelling of absorbing, reflecting and transmitting characteristics of multinanolayer...
In this paper, we present two approaches for the Millimeter-waves (mmW) generation fabricated using active/passive photonic integration technology. The first approach uses the optical heterodyne technique, an 4-channel AWG based laser is built in order to generate a 113 GHz signal. The second approach uses pulsed sources, an on-chip-multiple colliding pulse mode locked laser generating optical modes...
In this paper, we present the optical properties such as absorption, luminescence and IR transmission spectra of 2-styrylquinoline containing polymers thin films. We notice that the extension of the polymer chain in these compounds causes the change their spectroscopic and physical properties.
We report on the inscription of Bragg gratings in a bioresorbable phosphate optical fiber using 193 nm excimer laser radiation and the phase mask technique. Bragg gratings with a typical 6 dB transmission strength were created over a length of 5 mm employing moderate inscription energy densities. The dissolution of the fiber, when immersed in phosphate buffered saline (PBS) solution, was studied through...
Large network operator environments are composed of thousands of nodes and devices capable of performing multiple roles. This network infrastructure is multi-layered, multi-vendor and underpinned by a high capacity and complex optical transport network. Managing this network requires millions of lines of configuration files and hundreds of Operational Support Systems. Typically, the management data...
In this work, we analyze the influence of the nanocrystallization process on the luminescence properties of Er3+ ions in transparent oxyfluoride tellurite glass-ceramics obtained by heat treatment of the precursor Er-doped glass. The comparison between the fluorescence properties of Er-doped glass and glass-ceramics suggests that a fraction of Er3+ ions are forming nanocrystals while the rest remain...
The development of InP-based 4- and 8-channel IQ Mach-Zehnder modulator PICs as basic active building blocks in advanced hybrid terabit super-channel OFDM/Nyquist WDM transmitter components is reported for the first time.
IPTV has been widely deployed throughout the world, bringing significant advantages to users in terms of the channel offering, video on demand, and interactive applications. TV set-top boxes that are deployed in modern IPTV systems can be thought of as capable sensor nodes that collect vast amounts of data, representing both the user activity and the quality of service delivered by the system itself...
We compare energy levels, carrier localization and optical absorption of a single electron and a pair of interacting carriers confined in a hexagonal quantum ring. We show that many-body levels are multiple degenerate and, contrary to the single-particle case, no repeated energy sequence can be identified. The number of eigenvalues associated with corner-localized probability distributions increases...
The Network Function Virtualization paradigm enables the possibility to dynamically instantiate Virtual Network Functions (VNFs) in Commercial-Off-The-Shelf (COTS) hardware. Such VNFs are then concatenated together in Service Chains (SCs) to provide specific Internet services to the users. Depending on latency requirements for such services and considering the aim of maximally consolidating the VNFs...
We address the potential of a system with gain and loss featuring a PT-symmetric configuration for the realization of tunable, reconfigurable and non-reciprocal devices. By using PT-symmetric coupled waveguides and Bragg reflectors as fundamental building blocks, it is possible to build a wide variety of functional optical devices such as switches, unidirectional Bragg gratings, reconfigurable modal...
In this paper, we propose a novel method to experimentally determine the linear absorption coefficient (LAC) of graphene-silicon hybrid waveguides (GSHWs) by a symmetrical add-drop silicon microring resonator. Experimental results show that the LAC of a GSHW has an average value of 0.23 dB/µm. Our approach does not depend on the fiber coupling, waveguide end facets etc. and thus, is promising for...
A broad range of physical experiments and industrial applications have been proposed by employing optical microresonators. In this context, modelling, which is the main way of informing design decisions, is of paramount importance and still presents challenges when dealing with multiphysics stiff systems. Along this line, this paper presents a reliable numerical model for the scalable reduction of...
This paper proposes a fast beam switching operation for a multi-electrode quasi-stadium laser diode using mode competition between the axial and diamond-shaped resonator modes. Numerical calculations based on rate equations revealed that a switching time of a few nanoseconds can be realized by optimizing the device structure and operating conditions. The effect of gain saturation on the beam switching...
In the past decade, rare-earth-doped and also transition-metal-doped dielectric waveguides have emerged as highly efficient laser devices. This paper reviews the results in Ti:Sapphire, polymer, sesquioxides, amorphous aluminium oxide, and potassium double tungstates that have recently been obtained in our research group, partly in collaboration with other research groups.
We propose two new approaches to enhance the spectral compression process arising from nonlinear pulse propagation in an optical fibre. We numerically show that an additional sinusoidal temporal phase modulation of the pulse enables efficient reduction of the intensity level of side lobes in the spectrum. Another strategy is to select a regime of propagation in which normal group-velocity dispersion...
Here we study the impact of high optical power, within the C-band, on the reliability of modern single mode fibre. Our experiments show that modern fibre demonstrates >10 dB higher power handling performance beyond what has previously been reported.
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