Slow And Fast Light Based On Coupling Multi-Core Microstructured Optical Fiber

With development of information technology, people’s demand of information service is increasing rapidly. Current communication network is faced with severe challenge. Bottlenecks occur in traditional fiber communication network that uses photovoltaic conversion in large scale, so intelligent all-optical network that featured in all-optical signal processing is imperative. Optical buffer, one of the most important technologies in all-optical signal processing, relies on slow light technology that slow down light speed. In the other side, fast light technology is important in data synchronization and photoswitch. In this thesis, we study the slow/fast light technology and propose a slow/fast light device based on multi-core microstructured optical fibers (MOF). Our achievements include these:1. We propose a slow/fast light device based on three-core MOF that consists of SiO2cores and Si-ring cores. As dispersion characteristics of the cores are different, the supermodes generate considerable group index change corresponding to the group index of individual cores. In this way, the fiber controls the light speed. And then with finite element method, we deeply study the dispersion characteristics of the fiber. Numerical results show its time delay/advancement can reach lps/cm. Furthermore, we deeply analyze the relationship between the structure parameters of multi-core MOF and the indexes of slow/fast light devices. Involved parameters include difference of cores, coupling intensity among cores, and number of cores.2. We perform simulation of pulse propagation in multi-core MOF. Using step-split Fourier method to solve coupling Nonlinear Schrodinger, we find that when the propagation distance is55.8cm, three-core MOF delay a2-ps Sech pulse by55.7ps with broadening factor being2. In the meanwhile, two-core MOF delay the pulse by55.1ps with broadening factor being2.3. As can be concluded, compared with two-core MOF, three-core MOF generate smaller pulse broadening with almost the same time delay.3. To enrich the working wavelengths, we design a multi-wavelength slow/fast light device based on multi-core MOF. The fiber can be phase matched in both1.53μm and1.55μm in wavelength, so it can be used in multi-wavelength WDM system. In the wavelength of1.53μm, its time delay is1.7ps/cm, time advancement is0.1ps/cm, and the propagation distance is184.0cm with pulse broadening factor being2.In the wavelength of1.55μm, its time delay is0.9ps/cm, time advancement is0.9ps/cm, and the propagation distance is34.3cm with pulse broadening factor being2.