Abstract: Non-linearity effects arise as optical data rates, transmission lengths, number of wavelengths, and optical power levels are increased. The only worries that plagued optical fiber in the early day were fiber attenuation and, sometimes, fiber dispersion; however, these issues are easily dealt with using a variety of dispersion avoidance and cancellation techniques. Fiber non-linearities present a new realm of obstacle that must be overcome. These non-linearities previously appeared in specialized applications such as undersea installations. System designers must be aware of these limitations and the steps that can be taken to minimize the detrimental effects of fiber nonlinearities. One of the most important changes in fiber-optic communication systems brought about by EDFA (Erbium-doped fiber amplifiers) is the expansion of regenerator spacing up to transoceanic distances. However, a new problem has arisen, e.g., the accumulation of fiber non-linearities along the links with the increase in optical power levels. In optical communication systems, the input signal to the fiber is usually a composite optical signal modulated with information bit streams. When all the input signal frequencies interact due to fiber non-linearities, the output bit stream may behave in a complicated way giving adverse effects on system performance. Therefore, it is important to understand fiber non-linearities and their effects on optical communication systems. Here, we investigate power effects on simulation of optical communication systems with self-phase modulation (SPM) and cross phase modulation(XPM), by using the parametric run feature in OptSim (version 5.4). By varying the dispersion values, SPM grows and depletes the signal, and the measured power actually decreases with the increasing of the transmitted power. The eye diagram highlights the conversion due to the SPM and XPM. Specifically the eye opening decreases with increasing transmitted power.
Keywords: SPM, XPM, Kerr effect.
Title: Impact of Fiber Non-Linearities in Performance of Optical Communication
Author: Narender Kumar Sihval, Vivek Kumar Malik
International Journal of Electrical and Electronics Research
ISSN 2348-6988 (online)
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