Dense wavelength division multiplexing (DWDM) has become the dominant transport layer technology for next-generation backbone networks due to its unprecedented capacity scalability. As a result, there is a pressing need to investigate lightpath provisioning in multidomain DWDM networks. Although inter-domain provisioning has been well-studied for packet/cell-switching networks, the wavelength d...

Design of fault tolerant dense wavelength division multiplexing (DWDM) backbones is a major issue for service provision in the presence of failures. The problem is an NP-hard problem. This paper presents a genetic algorithm based approach for designing fault tolerant DWDM optical networks in the presence of a single link failure. The working and spare lightpaths are encoded into variable length...

In recent years, with the development of network technology and emergence of global Internet business, new Internet applications has a trend of explosive growth. Internet alone is introducing millions of individuals to a new world of information and technology. The demand for increasing bandwidth (voice, video, and data traffic) continues to drive the demand for fiber optical networks. Developm...

Volume 3, Issue 4, April 2014 Page 346 Abstract Dense Wavelength Division Multiplexing (DWDM) is a promising technique which can meet the increasing demand for communication bandwidth. It multiplexed all the channel signals onto single fiber thus increases the capacity of existing fiber. It is a perfect substitute for long haul networks. The major problem that DWDM technique suffered is dispers...

The use of new types of fibre with high density and high capacity dense wavelength division multiplexing (DWDM) systems leads to the investigation of system performance with these fibres. This paper compares the performance of a high-density (0.8bits/s/Hz) DWDM transmission system with 25 channels and 40Gb/s per channel with a channel spacing of 50GHz, using conventional single-mode fibre or no...

In this study, we examined the effect of phase noise on optical millimeter-wave (mm-wave) signal in a dense wavelength division multiplexing radio-over-fiber (DWDM-RoF) system. A single modulator was used to generate mm-wave DWDM-RoF This paper addresses impact noise, which results from imbalance, signal. To lower signal, imbalance should be controlled. The can controlled and decreased by adjus...

An all-optical UWB pulses generation and modulation scheme using cross phase modulation (XPM) effect of semiconductor optical amplifier (SOA) and DWDM-based multi-channel frequency discrimination is proposed and demonstrated, which has potential application in multiuser UWB-Over-Fiber communication systems. When a Gaussian pulse light and a wavelength-tunable CW probe light are together injecte...

VPN is an enterprise network based on a shared public network infrastructure but providing the same security, management, and throughput policies as applied in a private network. The primary advantages of "VPN over Internet" are cost-effectiveness and flexibility while coping with the exponential growth of Internet. However, the current disadvantages are the lack of sufficient QoS and provision...

This paper seeks to understand the performance of an optical link in DWDM systems, with emphasis on the influence of Optical Amplifiers EDFAs and its characteristic parameters on the signal performance. We begin by studying the optical fiber transmission DWDM system, its various elements and its characteristic parameters. Then, for a specific optical fiber transmission DWDM system with specific...

In this paper, we enhance the performance efficiency of free-space optical (FSO) communication link using hybrid on-off keying (OOK) modulation, M-ary digital pulse position modulation (M-ary DPPM), and M-pulse amplitude (M-PAPM). This work analyzes enhances bit error rate (BER) moment generating function, modified Chernoff bound, Gaussian approximation techniques. existence both an amplified s...