Broadband dispersion compensating photonic crystal fiber

Abstract

Presented work is a study of dispersion properties of photonic crystal fibers. The main objective is to design photonic crystal fibers suitable for potential compensation of group velocity dispersion of optical signals. New fiber structures are proposed, for example, a flattened-dispersion compensating photonic crystal fiber for broadband utilization in high-speed transmission systems is presented. The structure shows flattened negative value of dispersion over the O, C, and L bands. The fiber can eventually get applied in broadband optical signal recovery in systems with wavelength division multiplexing. Last but not least, a dual-core compensating microstructured fiber is optimized in order to achieve low dispersion and low loss at the C-band. Results presented in this work are obtained by using the FDFD method.

Dispersion Compensating Fibres for Fibre Optic Telecommunication Systems

“…This means that such a fibre could for example be used for some experiments in laboratory conditions (e.g. sensors), but they can't be used in outdoor installations of telecommunication systems [1].…”

“…[13] and [30], the idea how to use it to dope the microstructured fibre's core is described in details. But this solution is not perfect in terms of effective area of the mode which is rather small in the doped fibres, as well as from the perspective of increased attenuation caused by material absorption, which is high for germanium dioxide [1]. Another technique to be described and systematized is the one using air holes located close to the fibre centre.…”

“…Low value of CD parameter is possible in concentric cores. They could be obtained by removing [7], [10] or reducing [7], [31] the air fraction in some rings of holes [1].…”

“…A concentric core DCF based on microstructured optical fibre is proposed [1]. There is an assumption for the proposed structure to keep the 1 st mode in a central core over the wide working spectrum of λ and in order to obtain low CD at 1.55 µm, and with low theoretical losses.…”

“…DCFs have negative dispersion parameter; CD accumulating between regenerators is then suppressed. Consequently, bit error rate could be improved and the fibre reach could be extended [1].…”