Evaluate the Performance of Optical Cross Connect Based on Fiber Bragg Grating Under Different Bit Rate

Abstract

ABSTRACT In wavelength division multiplexed (WDM) optical networks, intraband and/or interband crosstalk plays a major role in limiting practical implementation of an OXC subsystem. Again FIBER BRAGG GRATINGS (FBGs), due to their properties, are emerging as very important elements for both the optical fiber communication and sensing fields. The crosstalk sources are related to the different individual components of the OXC’s. In this paper, an analytical model is established to evaluate the performance of an FBG-OC-based optical cross connect and proposed a novel scheme of transmission Fiber Bragg Grating for different wavelength separation and determine the BER and power penalty with optical wavelength division multiplexed cross-connect topologies at different bit rate. K EYWORDS Wavelength Division Multiplexing (WDM), Optical Cross Connect (OXC), Fiber Bragg Grating (FBG), Optical Circulator (OC). 1. I NTRODUCTION OPTICAL wavelength division multiplexing (WDM) networks are very promising due to their large bandwidth, their large flexibility and the possibility to upgrade the existing optical fiber networks to WDM networks [1-6]. WDM has already been introduced in commercial systems. Crosstalk analyses of OXCs presented so far are generally focused on conventional OXCs [7, 8]. All-optical cross connects (OXC), however, have not yet been used for the routing of the signals in any of these commercial systems. Several OXC topologies have been presented in the literature, but their use has so far been limited to field trials, usually with a small number of input–output fibers and/or wavelength channels. The fact, that in practical systems many signals and wavelength channels could influence each other and cause significant crosstalk in the optical cross connect, has probably prevented the use of OXC’s in commercial systems. The crosstalk levels in OXC configurations presented so far are generally so high that they give rise to a significant signal degradation and to an increased bit error probability. Because of the complexity of an OXC, different sources of crosstalk exist, which makes it difficult to optimize the component parameters for minimum total crosstalk. The crosstalk sources are related to the different individual components of the OXC’s. The crosstalk levels of the four topologies are compared in function of the number of cascaded OXC’s [9]. For evaluation of intra-band crosstalk in an FBG-OC-Based optical cross connect an analytical model is established to evaluate intra-band crosstalk performance and a novel scheme with improved intra-band crosstalk performance [10-11]. Incoherent crosstalk is defined as the case in which the beat term can be neglected (e.g., when the wavelengths are different). The case in which the beat term cannot be neglected is called coherent crosstalk. This crosstalk occurs in a WDM network