Abstract
Soft glasses exhibiting high non-linearity (γ), high refractive index and extended transmission window are of keen interest for effective Supercontinuum generation in conventional step-index fibers and microstructured photonic crystal fibers (PCF) [1]. For step-index fiber, though the design investigation of broadband generation is accurate because of analytically tractable exact solution, the exercise is limited by the lack of design flexibility of simple core-cladding fiber. On the other hand, PCFs are superb in view of their huge flexibility of microstructure design, even though the design is governed by the effectiveness of numerical tool used. Bragg fibers with high-index core, known as High Index Core (HIC) Bragg fiber [2], are of tremendous potential in this field owing to have many unusual and unique transmission characteristics In our research, we focused at this fiber and worked out for the first time the analytical formulation (both scalar and vector modes) towards supercontinuum generation. The structure was then optimized to map the flat- and preferred zero dispersion to achieve selectively ultra-broadband generation in mid IR region for dedicated application. This may not be possible through conventional optical fibers and is well consistent with the Supercontinuum generation achieved with PCFs [3]. To the best of our knowledge, the phenomenon of Supercontinuum generation in such a structure is not yet explored. Additionally, the model presented is precise because of our analytical mode evaluation used in dispersion engineering of the fiber. The reported results are unique and not touched upon in the contemporary literature.
© 2013 Japan Society of Applied Physics, Optical Society of America
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