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Several research institutes and commercial foundries presently offer shared wafer processing services based on generic integration technology. We have characterized SOAs fabricated in such a platform and compare their performance to discrete devices fabricated in a dedicated commercial process. Despite some limitations (presently single polarization and only C-band available), the characteristics...
Stacks of dielectric optical films are tailored to generate the third harmonic of femtosecond laser pulses. The improvement of efficiency compared to bulk samples of the same material is a combination of periodic reset of the phase mismatch and field enhancements due to resonant substructures.
Fifth generation (5G) wireless access is the next generation wireless-access technology expected to reach market around 2020. 5G will provide the long-term platform for the fully connected network society providing unlimited access to information and sharing of data anywhere and anytime for anyone and anything. This talk will focus on the characteristics and requirements on 5G radio access and the...
Current transport network has been established that separation of data plane and control plane including distributed signaling for path setup and protection, centralized path computation for planning and traffic engineering, provides significant benefits, but additional network resource virtualization and abstraction mechanisms are also required. By separating network resources and representing resources...
In the currently dominant cloud computing paradigm, applications are being served in data centers (DCs) which are connected to high capacity optical networks. For cost efficiency reasons, in both DC and optical network domains, virtualization of the physical hardware is exploited. In a DC, it means that multiple so-called virtual machines (VMs) are being hosted on the same physical server. Similarly,...
Intermediate Band Solar Cells (IBSCs) were proposed [1] as a variation of a compound III–V semiconductor pn junction solar cell [2] with a proposed efficiency of 63% with concentration of light [3]-making them the highest efficiency pn junction solar cell possible. A schematic energy band profile of a p-i-n junction IBSC is given in Fig. 1. There are several possible approaches to create the Intermediate...
We report observation of intense nonclassical optical field in the cavity-QED microlaser with Mandel Q of −0.6. The photon number variance of the field is only 40% of that of a coherent state with the same mean photon number of about 500. The cavity-QED microlaser consists of a Fabry-Perot cavity with a fitness of one million (cavity decay rate of 170 kHz) and a supersonic beam of barium atoms traversing...
In this work carrier lifetime investigations by applying photoluminescence frequency domain technique to investigate blue and green light emitting diode (LED) structures, thus representing wide spectra for the InGaN LEDs were performed. Similar measurements have been carried out in GaN at extremely low excited carrier densities [1], as low as 1 mW/cm2 by using UV LED as an excitation source. For these...
Microwave photonics and radio-over-fiber (RoF) technologies have been investigated for over 20 years, leading to a substantial stock of know-how which is now about to be exploited in the development of the 5th generation mobile systems (5G). These technologies have proven mature in niche areas such as distribution of highly pure clock signals for radio telescopes, photonic-based coherent radars, and...
Space-division multiplexing (SDM) is considered the only long-term viable path for sustained capacity scalability in optical networks, from metropolitan Mega-Datacenter interconnects all the way to ultra-long-haul transport systems. To counteract crosstalk arising from dense photonic integration, multiple-input multiple-output (MIMO) techniques are likely to be used, following techniques that both...
In this tutorial, I'll discuss fabrication aspects of cavities that contain quantum dots as active emitters. As far as the quantum dots are concerned, the most established fabrication technique is self-assembled Stranski-Krastanov growth [1]. This mechanism relies on the supply of a material with a lattice constant larger than that of the substrate, and quantum dots will form spontaneously after a...
Today electronic and optoelectronic devices use roughly 1 billion of electrons or photons. They rely thus on the laws of statistical physics with irreversibility and energy dissipation as prevailing factors. The next generation - so called quantum devices - will overcome these limitations by using single charges or photons. Their dynamics is governed by the unitary quantum evolution which is probabilistic...
Parametric devices based on four-wave mixing in fibers can amplify, frequency convert, phase conjugate, regenerate, sample and buffer optical signals. In this tutorial, I will review the physics of degenerate and nondegenerate four-wave mixing, and describe the polarization properties of these processes in rapidly-spun, randomly-birefringent and strongly-birefringent fibers.
The electromagnetic waves at frequencies from 0.1 THz (100 GHz) to 10 THz is referred to as millimeter (MM) waves and terahertz (THz) waves, which are located between microwaves and infrared light waves, and have remained unutilized for our life. Thanks to tremendous efforts of research and development over two decades, MM/THz technologies have proven lots of capabilities which are not available with...
Despite of recent progress in research on the subject of modernisation and automation of networks, most legacy optical networks still operate statically: when a connection has been set-up it is rarely reconfigured. Exception occurs in a case of a node/link failure: in that case reconfigurations concern only the traffic with a specific class of service (CoS) where a given resiliency has to be ensured...
The concept of wavelength division multiplexing (WDM) has revolutionized the field of optical communications. However, the immense demand for bandwidth shows no sign of abating and is pushing service providers to deploy communication networks with increased capacity. Optical transport networks will soon require channel data rates in excess of 100 Gb/s in order to continue to meet the ever increasing...
The fabrication and characterization of free-standing hybrid GaN photonic structures operating at 1.55 µm or in the visible range will be discussed. The structures are self-supported by tethers and coupled to photonic crystal waveguides and cavities. The fabrication process is based on the growth of GaN on Si, e-beam lithography and dry etching. W1 PhC waveguides and L3 cavities are investigated....
Nanophotonic architectures such as photonic crystals and metamaterials have become key players in modern photonics. They offer hitherto unprecedented capabilities combined with great versatility to control various properties of light -propagation, polarization, emission and photon statistics. They have become increasingly important for chip-scale photonics. In this talk, I will present research carried...
The 5th generation of mobile networks (5G) is the next major phase of mobile telecommunications which will provide the foundation for the Networked Society. To support 5G, transport will need to cater for increasingly diverse service requirements. It will need to support emerging 5G radio systems in terms of higher capacity, increasing number of cell sites and new deployment models. 5G transport must...
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