In this paper, the performance of high speed optical fiber based network is analysed by using dispersion compensating module (DCM). The optimal operating condition of the DCM is obtained by considering dispersion management configurations for the symmetrical system i.e Pre-compensation & Post-compensation. The dispersion compensating fiber (DCF) is tested for a single span, single channel system operating at a speed of 10 Gb/s with a transmitting wavelength of 1550 nm, over 120 km single mode fibre by using the compensating fiber for 24 km,30km and 35Km. So far, most of the investigations for single mode fiber (SMF) transmission at high amplifier spacings in the order of 90 km to 120 km is focused on conventional Non Return to Zero(NRZ) format. The simulation results are validated by analysing the Q-factor and Bit error rate (BER) in the numerical simulator OptSim.
It is seen that attenuation in the single-mode fiber is lowest in the 1.55-mm wavelength region (0.2 dB/km). However, the intramodal dispersion in this wavelength region is so severe that its effect is intolerable for very high BL systems. Because of the high dispersion the operating speed of the network reduces to 2.5 Gb/s. In order to take the advantage of lowest attenuation at this wavelength window, it was realized that the optical fibers need to be modified to have low dispersion in this window. In this technique, fibres of negative dispersion coefficient are made to alternate along the length of the optical link. Negative dispersion fibers (NDF) have a large dispersion in comparison to standard SMF, thus a relatively short NDF can compensate for dispersion accumulated over long links of SMFs. NDFs are easy to install and require little modification to an already existing system. The major disadvantage of NDF is that it exhibits a large attenuation in signal power, which results into using more optical amplifiers to be employed in the system. This in turn will overcome the other limitations in the system because the non-linear attributes of this fibre are considerably higher. So, which has been validated by using Symmetric Compensation (Pre, Post compensation).Also the results have been validated by numerical simulations with the optical simulator OptSim. Nutys et al. [1] investigated theoretically and experimentally the transmission performance of a 10 Gb/s repeater transmission system using DCF. The system configuration that was considered is a 360 km standard (1300 nm zero-dispersion) fiber transmission system with an optical repeater including DCFs located every 120 km (or every 2100 ps/nm dispersion). The transmitter was a DFB laser externally modulated by a zero-chirp LiNbO3 modulator with NRZ (non-return to zero), 440 PRBS data. The results of this investigation clearly demonstrate that the use of DCFs is an extremely effective method to overcome the chromatic dispersion in high-speed transmission systems. Weinert et al. [2] investigated the possibilities of 40 and 440 Gb/s time division multiplexing/wavelength division multiplexing (TDM/WDM) return-to-zero (RZ) transmission over embedded standard single-mode fibers (SMF) at a transmission wavelength of 1.55µ m both experimentally and theoretically. Dispersion of the SMF was compensated by a dispersion compensating fiber (DCF). Transmission over a span of 150 km of SMF in the single channel case and of 100 km SMF in the multichannel case is reported. It was shown numerically that improvement was achieved by employing the newest type DCF which also compensates the dispersion slope of the SMF. Mob et al. [3] theoretically and experimentally analyses advantages of nonlinear RZ over NRZ on 10 Gb/s single-span links. In India, during the past few years' fiber dispersion and nonlinearities have been studied and their impact on the system performance has been investigated. Sharma et al. [4] reviewed the various fiber dispersion compensation methods and investigated techniques for compensation of dispersion by differential delay method including the impact of higher order dispersion terms Kaler et al. [5] discussed the limitations due to Group velocity dispersion (GVD) on transmission distance, bit rate and laser line width including the higher order dispersion effects. The power penalty analysis for different realistic weight functions for combating the pulse broadening effects of group-velocity dispersion in a fiber-optic communication link using differential time delay method with higher-order dispersion terms [6] was discussed. Further, the propagation of signal and noise in the transmission medium to observe the validity of higher order dispersion terms [7] was described. The comparison of pre-compensation, post-compensation and symmetrical-dispersion compensation schemes for 10 Gb/s NRZ links using standard and dispersion compensated fibers was also investigated [8]. Section 2 discusses the proposed work regarding the DCF system configuration and its Symmetric Compensation taking into account the pre-compensation & post-compensation. Results for the simulation are validated and discussed in section 3, followed by the concluding remarks related to the dispersion compensation of various configurations in the Section 4.
• The fiber based method employs the dispersion compensation through a small section of fiber length.
There are various techniques such as dispersion compensation fiber (DCF), reverse dispersion fiber, negative dispersion fiber to compensate the dispersion of the system.
• Dispersion compensating fiber (DCF) is the predominant technology for dispersion compensation. It consists of an optical fiber that has a special design such as providing a large negative dispersion coefficient while the dispersion of the transport fiber is positive. A proper length of DCF allows the compensation of the chromatic dispersion accumulated over a giv
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