My Project

           The idea of the proposal originated when the undersigned was working for the analytical analysis of modal characteristics of unconventional Bragg fiber. And it knows that in modern communication system main component is an optical fiber which serves as a low-loss medium for light transmission. An important characteristic of fiber is the dispersion that light experiences as it travels inside the fiber. Dispersion is the phenomenon that causes different frequencies of light to travel at different velocities. The phenomenon of dispersion is commonly observed through the spreading of light by a prism. Dispersion is the affect it has on the performance of the communication systems. In these systems, dispersion, or more specifically second order dispersion, leads to a broadening of the pulses used to represent 1 or 0 in a digital communication system. Pulse broadening causes adjacent bits to overlap and leads to intersymbol interference. Intersymbol interference occurs when a pulse is broadened beyond its allocated bit slot to such an extent that it begins to overlap with adjacent bits and it is no longer possible to determine whether or not a specific bit contains a 1 or a 0. Current methods of countering the effects of dispersion in an optical fiber use dispersion compensating devices such as chirped fiber Bragg gratings and dispersion compensating fiber (DCF). In order to effectively use these techniques it is critical to know the exact magnitude of the dispersion that is being compensated for. As a result knowledge of the dispersion in both the transmission system and the dispersion compensation system is critical to the design of the overall communication system. Recent advances in Microstructured fiber or PCF allow for a high degree of control over the dispersion. This has led to a need for analytical /experimental testing to determine how close the dispersion in the fabricated device is to the predicted theoretical dispersion.