In this paper, the dispersion compensation can be accomplished by incorporating the fiber bragg gratings for high speed Radio over Fiber transmission system. The proposed model aims to investigate the performance of DWDM system utilizing Erbium Doped Fiber amplifiers EDFAs and fiber bragg gratings for different length of optical fiber and bit rates. The most essential factors that causes performance degradations are the attenuation and dispersion. EDFA was introduced in the proposed system

more »

... as a solution to encounter the effects of attenuation and scattering losses, while the fiber bragg gratings utilized to mitigate the effect of dispersion. The performance of proposed method has been analyzed using OptiSystem(14.0). The simulation results shows that the use of EDFA and fiber bragg gratings make significantly boosts the performance of DWDM RoF system. Keywords-Wavelength Division Multiplexing; Fiber bragg gratings; Radio over Fiber; Erbium Doped Fiber Amplifier. I. Introduction Nowadays, there is an increasing demand for broadband services which leads to ever-growing data traffic volumes over these services. In order to offer integrated broadband services (combining voice, data, video, multimedia services, and new value added services), systems will need to offer higher data transmission capacities. The need for increased capacity per unit area leads to higher operating frequencies, smaller radio cells and large number of base stations (BSs), therefore cost-effective BS development is a key success to the market. For this radio over fiber (RoF) technology has been proposed since it provides functionally simple BSs that are connected to a central station (CS) via an optical fiber. Radio over fiber (RoF) has been used efficiently for the provision of untethered access to broadband wireless communications in a range of applications including last mile solutions, extension of existing radio coverage and capacity. RoF is the next generation communication systems that can utilize the high capacity of optical networks along with the mobility of wireless networks. RoF technique has the potentiality to the backbone of the wireless access network. Such architecture can give several advantages, such as reduced complexity at the antenna site, radio carriers can be allocated dynamically to the different antenna sites, and transparency and scalability [1]. Optical fiber has many advantages compared to conventional system with low attenuations and superior signal integrity found, it allow much longer intervals of signal transmission. In order to reduce the system cost, the transmission of radio signals over fiber, with simple optical to electrical conversion, followed by radiation at remote antennas, which are connected to a central station. The reduction in cost can be brought in two ways. Firstly, the base stations required to perform only simple functions, it is smaller in size and low in cost. Secondly, the resources provided by the CS can be shared among many antenna BSs. This technique of modulating the radio frequency (RF) subcarrier onto an optical carrier for distribution over a fiber network is known as Radio over Fiber (RoF) technology. RoF technology takes advantage of the benefits of optical fiber with the mobility and ubiquity of wireless networks [2].Radio over Fiber is a well established technique for the distribution of wireless communication systems [3] . RoF is basically an analog transmission system because it distributes the radio waveform, directly at the radio carrier frequency, from CS to BS. The analog signal that is transmitted over the optical fiber is RF signal The RoF network typically comprises a central control station, where all switching, routing, media access control and frequency management functions are performed, an optical fiber network, which interconnects a large number of functionally simple and compact antenna Base Stations for wireless signal distribution. The main function of BS is to convert optical signal to wireless and wireless to optical signal. The centralization of RF signal processing functions enables equipment sharing, dynamic allocation of resources, simplified system operation and maintenance. A general RoF architecture is shown in Fig.1 . In this, RoF link consists of all the hardware required to impose an RF signal on an optical carrier, the fiber optic link and the hardware required to recover the RF signal from the carrier.