The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Reconfigurable Optical Add/Drop Multiplexers (ROADMs) are optical modules capable of adding/dropping or passing through any or all wavelengths present in DWDM signal with remote management capability. In performance of ROADMs, routing power ‘R’ which is a figure of merit has been used. The wavelength routing performance of ROADMs has been improved by inclusion of dynamic traffic under different traffic...
Conference proceedings front matter may contain various advertisements, welcome messages, committee or program information, and other miscellaneous conference information. This may in some cases also include the cover art, table of contents, copyright statements, title-page or half title-pages, blank pages, venue maps or other general information relating to the conference that was part of the original...
Quadrature Phase Shift Keying along with Polarization Division Multiplexing is used in 100G Fiber Optic Transceivers for maximizing the fiber spectral efficiency. PDM in these systems involve multiplexing of linearly polarized optical signals. In the present article, we extend this concept of polarization multiplexing to circularly polarized signals. Here, for the first time, we propose the use of...
A spectrally efficient optical distribution system based on frequency interleaving is investigated. The technique shows effective interleaving of three channels of baseband signals for wired applications with a data rate of 2.5 Gbps and three channels of 62.5 GHz radio-over-fiber for wireless services with a data rate of 1.25 Gbps, with complete spectrum occupying a bandwidth of 110 GHz. The interleaved...
Bandwidth and Delay are quality parameters that can be guaranteed for new connections that are offered to the network by finding a suitable path in the network. Finding such a suitable path is the task of QoS routing techniques developed for IP Optical networks based on Multiprotocol Label Switching (MPLS). In this paper we focus on dynamic routing of Bandwidth (1Mbps/link) and delay (1ms/link) guaranteed...
This paper describes a Multi-Wavelength C-Band Tunable MEMS 2×2-array Vertical Cavity Surface Emitting Laser. Optical detectors, optical filters and Wavelength-tunable lasers play a pivotal role in the future ultrahigh bandwidth dense-wavelength-division-multiplexed (DWDM) optical network, enabling revolutionary new applications such as wavelength-on-demand in a reconfigurable all-optical network...
Linear as well as nonlinear absorption of TiO2-SiO2 nanocomposites prepared by sol gel process has been reported. To investigate the nonlinear properties, Z Scan technique was employed with 532 nm as the excitation wavelength followed by the calculation of the nonlinear optical constants. Z-scan experiments showed that when the excitation energy increased, the nonlinear absorption of the nanocomposites...
The atmosphere affects the ground-to-satellite optical link characteristics. In Free Space Optical (FSO) communication it is important to minimize these atmospheric effects, so that efficient communication can take place. In this research paper different modulation schemes as such Pulse Position Modulation (PPM), Differential Pulse Position Modulation (DPPM) and Differential Amplitude Pulse Position...
This work aims at providing an effective parking management system by reducing the drivers' searching time for vacant car-parking space, in turn improving the traffic flow in the car park areas. This is achieved by the use of Fiber Bragg Grating Sensor (FBG) sensor instrumentation in vehicle parking management system. Present work involves embedding an array of FBG sensors underground in the parking...
Based on variational principle, we have earlier developed an analytical model for the modal field of indexguiding microstructured optical fibers (MOFs). Using the model, we study the linear properties of MOF such as spot-sizes; their application in calculating numerical aperture NA and splice loss between an MOF and SMF-28 with transverse offset. Comparisons with available experimental and simulation...
We report electrochemically synthesized polypyrrole (Ppy) thin films. The polypyrrole thin films were deposited by galvanostatic as well as potentiostatic deposition mode. The polypyrrole thin film was characterized by Scanning Electron Microscopy (SEM) and UV-VIS spectroscopy. The optical absorption study gives the absorption peaks nearly at the wavelength of 430 nm to 438 nm and an absorption shoulder...
Novel blue light-emitting materials were designed by the substitution at the 4-position of 1,8-naphthalimide with electron-donating phenoxy group. The effect of molecular structure on the photophysical, electronic structure properties of the derivatives was explored by UV-visible absorption spectroscopy, photoluminescence spectroscopy, cyclic voltammetry and quantum chemical calculations. Both UV-visible...
In this paper, we generate bright as well as dark soliton type ultrashort laser pulses in a photonic nanowire. The pulse evolution in the photonic nanowire is described by higher order nonlinear Schrödinger equation with an additional effect relating to the nonlinear change of group velocity, which, in turn, is proportional to the field intensity. The pulse evolution equation is solved by coupled...
We demonstrate the construction of a fiber based mode locked laser that is driven in synchronization with a femtosecond master laser through an RF circuit. The laser is characterized based on the pulse widths and pulse powers around the locking frequency. The cavity length of the laser was then optimized to have a match between the locking frequency and the master lasers repetition rate. Two stages...
Quantitative molecular density distribution of Methyl ethyl ketone (MEK) in turbulent nitrogen jet (Re≈2−3×103) was measured using PLIF technique. The tracer (MEK) was seeded in the nitrogen jet by purging through the liquid MEK at ambient temperature. Planar laser sheet from frequency quadrupled, Q-switched, Nd: YAG laser (266 nm) was used as an excitation source. Emitted fluorescence images of jet...
We explore all-optical pulse coupling dynamics of nitrobenzene filled dual core photonic crystal fiber coupler (LCPCF). The optical characteristics of the proposed design is obtained using the finite element method (FEM). The optical pulse dynamics through the proposed coupler model described by a set of coupled nonlinear Schrödinger equation has been studied by projection operator method (POM). POM...
The paper on hand shows an organic solar cell that combines the Shockley Queisser (SQ) theory with the classical diode theory to describe the microscopic processes which exist inside a cell. The photon recycling term is used to connect these two existing theories of solar cells. So this model can describe the interactions of electrons, holes and excitons and also reproduces the maximum SQ quantum...
In this paper we examine the energy consumption of IP Over Optical WDM Networks. As the number of Internet users increases the Internet expands in reach and capacity. This results in increased energy consumption of the network. Minimizing the power consumption, termed as “Greening the Internet”, is desirable to help service providers (SP) operate their networks and provide services more efficiently...
This paper presents modelling of Fiber Bragg Grating (FBG), in order to provide the optimized parameters for designing sensor. FBG sensor applications require narrow spectral response for achieving good performance. Spectral characteristics parameters like FBG length, grating pitch, cladding index, apodization and (Full Width Half Maximum) FWHM are varied for achieving good response. Simulation results...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.