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Chromatic Dispersion in optical Communications
... Optical transmission systems have been managed to our demands to be able to transfer the required data volumes. Unfortunately, these requirements are increasing, forcing us to deal with problems, which we saw only in theory so far. Specifically, one of these is the chromatic dispersion influence. Op ...
... Optical transmission systems have been managed to our demands to be able to transfer the required data volumes. Unfortunately, these requirements are increasing, forcing us to deal with problems, which we saw only in theory so far. Specifically, one of these is the chromatic dispersion influence. Op ...
IOSR Journal of Electronics and Communication Engineering (IOSR-JECE)
... transmission systems has brought out the necessity of increasing the spectral efficiency by employing different transmission techniques and also increasing transmission speed in optical networks. One optical technique used to improve the efficiency of optical communication systems is polarization di ...
... transmission systems has brought out the necessity of increasing the spectral efficiency by employing different transmission techniques and also increasing transmission speed in optical networks. One optical technique used to improve the efficiency of optical communication systems is polarization di ...
Metal-dielectric-metal plasmonic waveguide devices for
... have been proposed, such as metallic nanowires[2,3] and metallic nanoparticle arrays[4,5]. Most of these structures support a highly-confined mode only near the surface plasmon frequency. In this regime, the optical mode typically has low group velocity and short propagation length. It has been show ...
... have been proposed, such as metallic nanowires[2,3] and metallic nanoparticle arrays[4,5]. Most of these structures support a highly-confined mode only near the surface plasmon frequency. In this regime, the optical mode typically has low group velocity and short propagation length. It has been show ...
Fiber Bragg Gratings
... A second method uses Bloch wave analysis on the grating structure allowing for exact solutions, since Block waves are the natural modes of periodic media. The Bloch treatment is more invovled than coupled mode theory, but it is more appropriate for more complex structures such as superlattices or wh ...
... A second method uses Bloch wave analysis on the grating structure allowing for exact solutions, since Block waves are the natural modes of periodic media. The Bloch treatment is more invovled than coupled mode theory, but it is more appropriate for more complex structures such as superlattices or wh ...
... Abstract: This article is focused on the turbulence attenuation and their effect on optical beam in free space. Analysis has been done for comparison the atmospheric turbulence effect between two classical methods, Rytov approximation and Andrews's method. The SNR was calculated for not weak turbule ...
Low-Complexity Velocity Estimation in High
... shifts below 0.1 kHz are assumed to be insignificant. Over the range of Doppler frequencies, 2.5 µs of IFD recording time implies that we would have less than 0.0075 periods of the Doppler shift. The short time of the acquisition and the noise of the recorded IFD severely limit the resolution of STF ...
... shifts below 0.1 kHz are assumed to be insignificant. Over the range of Doppler frequencies, 2.5 µs of IFD recording time implies that we would have less than 0.0075 periods of the Doppler shift. The short time of the acquisition and the noise of the recorded IFD severely limit the resolution of STF ...
Bild 1
... AlAs/GaAs is used in resonant cavity LEDs and vertical cavity surface emitting lasers. Different strategies are used to optimize DBRs. One of them is to use composite DBR in an AlGaInP LED, that is, two types of DBRs stacked on top of each other, namely a non-absorbing (Al0.4Ga0.6)0.5In0.5P/Al0.5In0 ...
... AlAs/GaAs is used in resonant cavity LEDs and vertical cavity surface emitting lasers. Different strategies are used to optimize DBRs. One of them is to use composite DBR in an AlGaInP LED, that is, two types of DBRs stacked on top of each other, namely a non-absorbing (Al0.4Ga0.6)0.5In0.5P/Al0.5In0 ...
Enhanced transmission in near-field imaging of layered plasmonic
... structure is greater than the intensity of light through the void because the double layer structure induces surface plasmons in the aperture for increased optical transmission through the aperture. When this thickness is structured into a double layer sandwiching a 50 nm dielectric, illumination ou ...
... structure is greater than the intensity of light through the void because the double layer structure induces surface plasmons in the aperture for increased optical transmission through the aperture. When this thickness is structured into a double layer sandwiching a 50 nm dielectric, illumination ou ...
Four Aces of Refractive Surgery: Aberrations
... A Hartmann-Shack device uses a narrow laser beam that is sent along the ocular line of sight into the eye, where it reflects fromthe retina. This reflection serves as secondary source that illuminates the pupillary area from behind. When a plane or spherical wavefront is projected into a perfect opt ...
... A Hartmann-Shack device uses a narrow laser beam that is sent along the ocular line of sight into the eye, where it reflects fromthe retina. This reflection serves as secondary source that illuminates the pupillary area from behind. When a plane or spherical wavefront is projected into a perfect opt ...
Ultrafast Nonlinear Optical Signals Viewed from the Molecule`s
... macroscopically using Maxwell’s equations, the present formalism allows for a fully microscopic calculation of the entire process. For example, n þ 1 wave mixing appears as a concerted n þ 1 photon event and all n þ 1 field modes (including the signal) are treated on the same footing. Resonant contr ...
... macroscopically using Maxwell’s equations, the present formalism allows for a fully microscopic calculation of the entire process. For example, n þ 1 wave mixing appears as a concerted n þ 1 photon event and all n þ 1 field modes (including the signal) are treated on the same footing. Resonant contr ...
Optical Materials for LWIR Applications
... temperatures in the -30 to 90 °C range have peak emittance in the LWIR. One major limitation optical engineers face when designing imaging systems for the LWIR is the lack of available optical materials. An engineer designing a visible system has hundreds of different materials at his/her disposal w ...
... temperatures in the -30 to 90 °C range have peak emittance in the LWIR. One major limitation optical engineers face when designing imaging systems for the LWIR is the lack of available optical materials. An engineer designing a visible system has hundreds of different materials at his/her disposal w ...
Novel Machine Learning Approaches to Molecular Coherent Control
... which, because of the bandwidths used here, has inter-pulse delays similar to those of the first peaks in the pump-probe scans. That the greatest enhancements are seen for steps close to the central wavelength (when the intensity goes to zero between the subpulses) is consistent with the idea that b ...
... which, because of the bandwidths used here, has inter-pulse delays similar to those of the first peaks in the pump-probe scans. That the greatest enhancements are seen for steps close to the central wavelength (when the intensity goes to zero between the subpulses) is consistent with the idea that b ...
PDF
... nˆ(r ) (a unit vector with non-polar symmetry describing the local average molecular orientation) twists through 360° is called the cholesteric pitch p [10, 11]. CLCs can be composed of a single chemical compound with chiral molecules lacking mirror symmetry as well as of mixtures of a nematic host ...
... nˆ(r ) (a unit vector with non-polar symmetry describing the local average molecular orientation) twists through 360° is called the cholesteric pitch p [10, 11]. CLCs can be composed of a single chemical compound with chiral molecules lacking mirror symmetry as well as of mixtures of a nematic host ...
Experimental Verification of n = 0 Structures for Visible Light
... around 800 nm as evidenced by the sharp decrease in ...
... around 800 nm as evidenced by the sharp decrease in ...
Split-field finite-difference time-domain method for second-harmonic generation in two-dimensionally periodic structures
... A. Fundamentals of the SF-FDTD Method Figure 2(a) shows the problem space for a typical SF-FDTD simulation of periodic media. The convention for the spatial arrangement of the electric field E and the magnetic field H, called the Yee cell, is shown in Fig. 2(b). Such an arrangement simplifies the fi ...
... A. Fundamentals of the SF-FDTD Method Figure 2(a) shows the problem space for a typical SF-FDTD simulation of periodic media. The convention for the spatial arrangement of the electric field E and the magnetic field H, called the Yee cell, is shown in Fig. 2(b). Such an arrangement simplifies the fi ...
Document
... of input power to output power. Gain at 1560 nm is some 3 dB higher than gain at 1540 nm (this is twice as much). In most applications (if there is only a single channel or if there are only a few amplifiers in the circuit) this is not too much of a limitation. WDM systems use many wavelengths withi ...
... of input power to output power. Gain at 1560 nm is some 3 dB higher than gain at 1540 nm (this is twice as much). In most applications (if there is only a single channel or if there are only a few amplifiers in the circuit) this is not too much of a limitation. WDM systems use many wavelengths withi ...
The Absolute Sensitivity of Lens and Compound Eyes
... are located with their distal endings. Light concen trated by the dioptrics onto the distal endings of either individual or of several fused rhabdomeres travels down these structures, which act as light guides, due to their relatively high refractive index. Thus, light will be partially absorbed by ...
... are located with their distal endings. Light concen trated by the dioptrics onto the distal endings of either individual or of several fused rhabdomeres travels down these structures, which act as light guides, due to their relatively high refractive index. Thus, light will be partially absorbed by ...
1.3 lm integrated superluminescent light source Yang Liu Guotong Du
... approximately. Compared with the case of IS 0 A, the gain of SOA (when IA 4 A) acquired by calculation is 18 dB when Pin 0:284 mW at the condition of IS 300 mA. To depict the operating state of the SOA clearly, the curve (Fig. 3) of gain vs the current for SOA was obtained by means of the ab ...
... approximately. Compared with the case of IS 0 A, the gain of SOA (when IA 4 A) acquired by calculation is 18 dB when Pin 0:284 mW at the condition of IS 300 mA. To depict the operating state of the SOA clearly, the curve (Fig. 3) of gain vs the current for SOA was obtained by means of the ab ...
Silicon photonics
Silicon photonics is the study and application of photonic systems which use silicon as an optical medium. The silicon is usually patterned with sub-micrometre precision, into microphotonic components. These operate in the infrared, most commonly at the 1.55 micrometre wavelength used by most fiber optic telecommunication systems. The silicon typically lies on top of a layer of silica in what (by analogy with a similar construction in microelectronics) is known as silicon on insulator (SOI).Silicon photonic devices can be made using existing semiconductor fabrication techniques, and because silicon is already used as the substrate for most integrated circuits, it is possible to create hybrid devices in which the optical and electronic components are integrated onto a single microchip. Consequently, silicon photonics is being actively researched by many electronics manufacturers including IBM and Intel, as well as by academic research groups such as that of Prof. Michal Lipson, who see it is a means for keeping on track with Moore's Law, by using optical interconnects to provide faster data transfer both between and within microchips.The propagation of light through silicon devices is governed by a range of nonlinear optical phenomena including the Kerr effect, the Raman effect, two photon absorption and interactions between photons and free charge carriers. The presence of nonlinearity is of fundamental importance, as it enables light to interact with light, thus permitting applications such as wavelength conversion and all-optical signal routing, in addition to the passive transmission of light.Silicon waveguides are also of great academic interest, due to their ability to support exotic nonlinear optical phenomena such as soliton propagation.