Contents
2013
Volume: 1 Issue 2
6 Article(s)
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Metamaterials
Generalization of the effects of high Q for metamaterials
Raphael Tsu, and Michael A. Fiddy
We revisit the electrodynamics of resonant high-Q interactions in atomic systems with a view to gaining insights into the design of meta-atoms and hence bulk metamaterials with profoundly different electromagnetic responses. The relevance of phase coherence and nonlinearity in charged systems is emphasized, as is the nWe revisit the electrodynamics of resonant high-Q
Photonics Research
- Publication Date: Jul. 19, 2013
- Vol. 1, Issue 2, 77 (2013)
Nonlinear Optics
Analysis of the performance of optical frequency comb based on recirculating frequency shifter influenced by an Er-doped fiber amplifier
Hao Tu, Lixia Xi, Xiaoguang Zhang, Xia Zhang, Jiachuan Lin, and Wan Meng
The factors that influence the generation of a high-quality optical frequency comb (OFC) based on a recirculating frequency shifter (RFS) due to the maximum output power and noise figure of Er-doped fiber amplifier (EDFA) are studied theoretically and experimentally. Based on the theoretical analysis, numerical simulatThe factors that influence the generation of a high-quality optical frequency comb (OFC) based on a recirculating frequency shifter (RFS) due to the maximum output power and noise figure of Er-doped fiber amplifier (EDFA) are studied theoretically and experimentally. Based on the theoretical analysis, numerical simulations and experiments under different EDFA parameters have been carried out. The results show that the performance of the OFC based on a RFS can be improved effectively by optimizing the maximum output power and the noise figure of the EDFA..
Photonics Research
- Publication Date: Jul. 19, 2013
- Vol. 1, Issue 2, 88 (2013)
Imaging in focusing Kerr media using reverse propagation [Invited]
Alexandre Goy, and Demetri Psaltis
We present imaging experiments in focusing Kerr media using digital holography and digital reverse propagation (DRP) of the wave. For moderate power, the nonlinear DRP algorithm can be used to improve the quality of images over the linear DRP. We discuss the limits of the method at high power, the role of small-scale fWe present imaging experiments in focusing Kerr media using digital holography and digital reverse propagation (DRP) of the wave. For moderate power, the nonlinear DRP algorithm can be used to improve the quality of images over the linear DRP. We discuss the limits of the method at high power, the role of small-scale filaments, and the problem of time-dependent self-phase modulation..
Photonics Research
- Publication Date: Jul. 19, 2013
- Vol. 1, Issue 2, 96 (2013)
Optical Communications
Visible light communications: 3.75 Mbits/s data rate with a 160 kHz bandwidth organic photodetector and artificial neural network equalization [Invited]
Zabih Ghassemlooy, Paul Anthony Haigh, Francesco Arca, Sandro Francesco Tedde, Oliver Hayden, Ioannis Papakonstantinou, and Sujan Rajbhandari
This paper presents an experimental demonstration of a visible light communications link with an light emitting diode and a low-bandwidth organic photodetector as transmitter and receiver, respectively, that achieves sub 4 Mbits/s speeds. An artificial neural network (ANN) equalizer is required in order to achieve suchThis paper presents an experimental demonstration of a visible light communications link with an light emitting diode and a low-bandwidth organic photodetector as transmitter and receiver, respectively, that achieves sub 4 Mbits / s 300 kbits / s 3.75 Mbits / s
Photonics Research
- Publication Date: Jul. 19, 2013
- Vol. 1, Issue 2, 65 (2013)
Optical domain digital-to-analog converter for visible light communications using LED arrays [Invited]
Jean Armstrong
In this paper, we describe a new type of digital-to-analog converter (DAC) for optical wireless communication. Conversion occurs in the optical rather than the electrical domain. The overall intensity of the light transmitted by an array of light-emitting diodes (LEDs) is varied by changing the number of LEDs that are In this paper, we describe a new type of digital-to-analog converter (DAC) for optical wireless communication. Conversion occurs in the optical rather than the electrical domain. The overall intensity of the light transmitted by an array of light-emitting diodes (LEDs) is varied by changing the number of LEDs that are switched on. A number of different structures are described, and their compatibility with light dimming and overall energy efficiency are discussed. The linearity of the new DAC depends on the geometry of the system and on the variability in light output between individual LEDs..
Photonics Research
- Publication Date: Jul. 19, 2013
- Vol. 1, Issue 2, 92 (2013)
Silicon Photonics
Germanium tin: silicon photonics toward the mid-infrared [Invited]
E. Kasper, M. Kittler, M. Oehme, and T. Arguirov
Germanium tin (GeSn) is a group IV semiconductor with a direct band-to-band transition below 0.8 eV. Nonequilibrium GeSn alloys up to 20% Sn content were realized with low temperature (160°C) molecular beam epitaxy. Photodetectors and light emitting diodes (LEDs) were realized from in situ doped pin junctions in GGermanium tin (GeSn) is a group IV semiconductor with a direct band-to-band transition below 0.8 eV. Nonequilibrium GeSn alloys up to 20% Sn content were realized with low temperature (160°C) molecular beam epitaxy. Photodetectors and light emitting diodes (LEDs) were realized from in situ doped pin junctions in GeSn on Ge virtual substrates. The detection wavelength for infrared radiation was extended to 2 μm with clear potential for further extension into the mid-infrared. GeSn LEDs with Sn content of up to 4% exhibit light emission from the direct band transition, although GeSn with low Sn content is an indirect semiconductor. The photon emission energies span the region between 0.81 and 0.65 eV. Optical characterization techniques such as ellipsometry, in situ reflectometry, and Raman spectroscopy were used to monitor the Sn incorporation in GeSn epitaxy..
Photonics Research
- Publication Date: Jul. 19, 2013
- Vol. 1, Issue 2, 69 (2013)
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