Orthogonal Frequency Division Multiplexing (OFDM) is an multicarrier modulation Format that can be easily adopted by different telecommunication standards such as LTE, LTE-A, Wi-Fi & WiMAX etc, now getting used in optical fiber communication. Chromatic dispersion arises due to Inter Symbol Interference (ISI) and it is serious issue in long-distance communication. The performance of CO-OFDM / WD...

During the last decade telecommunication operators have been deploying WDM (Wavelength Division Multiplexing) technology to satisfy the exponential growth in global communication. While facilitating the advanced information society of today, this has also led to a higher dependency on the networks, and furthermore the high capacity utilisation of optical fibres means that a single link failure ...

Abstract—A physical model for guiding the wave in photorefractive media is studied. Propagation of cos-Gaussian beam as the special cases of sinusoidal-Gaussian beams in photorefractive crystal is simulated numerically by the Crank-Nicolson method in one dimension. Results show that the beam profile deforms as the energy transfers from the center to the tails under propagation. This simulation ...

We study an optomechhanical device supporting at least three optical modes in the infrared telecommunication band and mechanical vibration modes. model coherent driving of each mode, independently other, to obtain effective Hamiltonian showing different types parametric processes allowed device. propose a bichromatic scheme, lossy cavity regime, under mean field approximation, that provides qua...

This paper investigates the role of pitch accent information in spoken-word recognition in listeners in Fukushima, Japan, whose dialect is accentless. Previous research revealed that accentless listeners were less sensitive to pitch accent than Tokyo Japanese listeners. The present study asked whether middle-aged listeners’ use of accent information would differ from that of young listeners. 40...

As Internet traffic increases, large communication capacity is required in optical communication systems. For the client side of DWDM *1 (dense wavelength division multiplexing) systems, the baud rate of current optical communication is mainly 10 Gbit/s, which has already been used in 10G Ethernet. However, these systems will be insufficient for the accelerated traffic increase expected in the ...

Nowadays, optical communications are the most requested and preferred telecommunication technology, due to its large bandwidth and low propagation attenuation, when compared with the electric transmission lines. Besides these advantages, the use of optical fibers often represents for the telecom operators a low implementation and operation cost. Moreover, the applications of optical fibers goes...

Optical and wireless technology integration has been proposed as one of the most promising nominees for the nextgeneration broadband access networks for quite some time. Integration scheme merges the high-speed and high-capacity of the optical networks with the low-cost, wide-coverage and mobility features of the wireless counterparts for the Subscriber Stations (SSs). It is also financially vi...

Network design and network synthesis have been the classical optimization problems in telecommunication for a long time. In the recent past, there have been many technological developments such as digitization of information, optical networks, internet, and wireless networks. These developments have led to a series of new optimization problems. This manuscript gives an overview of the developme...