Single-hop wavelength division multiplexing (WDM) ring networks operating in packet mode are a promising architecture for the design of innovate Metropolitan Area Networks. They allow a cost-effective design, with a good combination of optical and electronic technologies, while supporting features like restoration and reconfiguration that are essential in any metropolitan scenario. In this arti...

This paper introduces various techniques for a new fronthaul network segment applied in centralized radio access networks (C-RAN) architecture. The promising fronthaul interfaces are described which are considered to meet physical requirements for the fronthaul network segment and to build a new radio access network solution. Various optical solutions including CPRI (Common Public Radio Interfa...

We consider the problem of traffic grooming in wavelength division multiplexing networks. Our objective is to minimize the required number of electronic add-drop multiplexers. We investigate the problem of efficiently provisioning connections of different bandwidth granularities in a heterogeneous WDM mesh network through dynamic traffic grooming schemes under traffic engineering principles. We...

optical networks working on WDM (Wavelength Division Multiplexing) are prone to component failures. As these networks carry huge amount of information, fault management has become vital in maintaining survivability of high speed optical networks. In WDM networks failure of networks, failure of network element may cause the failure of several optical channels, thereby leading to large data losse...

A novel heterodyne Doppler interferometer method for compensating motion artifacts caused by cardiac motion in intracoronary optical frequency domain imaging (OFDI) is demonstrated. To track the relative motion of a catheter with regard to the vessel, a motion tracking system is incorporated with a standard OFDI system by using wavelength division multiplexing (WDM) techniques. Without affectin...

The rapidly increase in demand for bandwidth from end-users forces network infrastructure to be peta-bit/s capacity. The efficient utilization of the bandwidth of an optical fiber is a major issue in the design of ultrahigh-speed photonic networks. The two primary techniques for multiplexing data signals onto the channel of a single fiber are currently time division multiplexing (TDM) and wavel...

The problem of Routing and Wavelength Assignment in Wavelength Division Multiplexing (WDM) optical networks consists in routing a set of lightpaths and assigning a wavelength to each of them, such that lightpaths whose routes share a common fiber are assigned to different wavelengths. When the objective is to minimize the total number of wavelengths used, this problem is NP-hard. The current st...

Fiber optic communication technology has brought a revolution since 1970s. This technology has rapidly replaced the copper wires, starting from the core backbone networks then gradually to the metro and now finally towards the access networks. WDM networks present concurrency by multiplexing more than one wavelength and transmit them simultaneously within the same fiber. A lightpath is an optic...

We present the design of a demultiplexer based on photonic crystals (PC). The control of the refractive index, periodicity, geometry and size of the structure, are very important to light propagation in PC. The demultiplexer is intended to separate pulse channels with 1.3 and 1.55 μm wavelength into wide pass band wavelength division multiplexing (WDM) optical telecommunications systems. The de...

We study wavelength assignment for lightpaths over WDM rings to minimize the SONET ADMs used. This problem has attracted much attention recently. However, its computation complexity remains unknown, and the only known heuristic [6] which does not allow the splitting of lightpaths is problematic in both the algorithm itself and its performance analysis. We first prove the NP-completeness of this...