<span>The optical communication and wireless networks can be integrated to increase the capacity and mobility with decrease the costs in the access networks. Optical communication is considered a Fiber optic communication that can be used for wired and wireless communication. The problems of Fiber optic communication have a solution represented by Radio over fiber (RoF) which can control many base stations (BSs) that connect to a central station (CS) with an optical fiber. The Coherent optical OFDM (CO-OFDM) have concerned a great interest due to the high spectral efficiency and strength to the fiber dispersion, also it can be considered as a promising candidate when used in long haul optical fiber transmission systems. The integration of the wavelength division multiplexing system (WDM) with (CO-OFDM) system for increasing the system performance as well as achieving high data rates. The simulation of WDM-ROF and (WDM-CO-OFDM) with an optisystem simulator to analyze the RF spectrum, spectrum signal visualizers, and constellation diagrams. The proposed of integration of WDM and RoF-OFDM system is to achieve 100 km fiber length using 4QAM sequence bit, and the received power with electrical and optical amplifications by using 10 Gbps data signal.</span>
In social merchandise, there are many similar products emanating from many enterprises. The enterprises want to scatter details for their products so that they are known widely in social media. This is because they believe in competitive advantage for commercial products. There has been research merging two enterprises for worldwide circulation and popularity. The initial procedure entails finding seed points then later disseminate details separately as per the separate Cascade approach. The aim is finding an initial common ground the dissemination to social platforms. Significant is also how fast data diffusion can be done. Data effect will arise from either none, one or more nodes in a social interconnection. Evaluation is also accomplished on the number of fraction parts in various sections are affected by the different rates of data diffusion. The simulation result for proposed framework introduces good outcomes result.
Free space optic (FSO) is one of the most effective solution technique to transmit the information due to its advantage such as cost and speed, but it suffers from various disadvantage that affects on the signal performance like weather condition that results loss in optical signal power over the communication path. So, in this paper we study the effect of the rain weather in Iraqi cities [ Baghdad, Basra, Mosul ] during 2017 on the FSO signal with system of hybrid Sub-carrier multiplexing _Spectral amplitude coding _ optical code division multiple access (SCM-SAC-OCDMA) with multi diagonal (MD) code and intermediate stage called ‘optical amplifier’. OCDMA allows multiple users to access the medium without any contention; it provides privacy and security with reducing the interference that may occur due to multiple users. MD code has been use to provide simplicity in design and high data rate. The optical amplifier with controlled gain leads to amplify the power of the signal. Results from simulation analysis for the proposed system can transmit data rate with (1Gbps) for (1 Km) distance and transmit power of (5dB) with bit error rate (BER) 10−12 in Mosul, 3× 10−56 in Baghdad, 1 × 10−62 in Basra.
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