Centre of Expertise in Photonics (CoEP)
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Founded in early 2005, the Centre of Expertise in Photonics (CoEP) is a research initiative within the School of Chemistry & Physics at the University of Adelaide focusing on the design, fabrication and application of soft glass optical fibres.
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Browsing Centre of Expertise in Photonics (CoEP) by Author "Broderick, N."
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Item Open Access Advances and limitations in the modelling of fabricated photonic bandgap fibers(IEEE, 2006) Poletti, F.; Petrovich, M.; Amezcua-Correa, R.; Broderick, N.; Monro, T.; Richardson, D.; Conference on Optical Fiber Communication (2006 : Anaheim, California)We model fabricated silica photonic bandgap fibers and achieve good agreement between simulated and measured properties. We identify the size of the SEM bitmap image as the ultimate limit to the accurate calculation of surfaces modes within the bandgapItem Open Access Advances in microstructured fiber technology(IEEE, 2005) Richardson, D.; Poletti, F.; Leong, J.; Feng, X.; Ebendorff-Heidepriem, H.; Finazzi, V.; Frampton, K.; Asimakis, S.; Moore, R.; Baggett, J.; Hayes, J.; Petrovich, M.; Tse, M.; Amezcua, R.; Price, J.; Broderick, N.; Petropoulos, P.; Monro, T.; IEEE/LEOS workshop on fibres and optical passive components (4th: 2005 : Palermo, Italy); RivaSanseverino, S.; Artiglia, M.We review our recent progress in the area of microstructured fiber design, fabrication and applications with particular emphasis on the control of both the nonlinearity and dispersion.Item Open Access Brillouin characterization of holey optical fibers(Optical Soc Amer, 2006) Furusawa, K.; Yusoff, Z.; Poletti, F.; Monro, T.; Broderick, N.; Richardson, D.We report the results of detailed measurements on the Brillouin frequency shift (BFS), gain bandwidth, and gain coefficients of several small-core holey optical fibers (HFs) of both uniform and axially varying structural characteristics and compare these with measurements on more conventional fibers. Our measurements show that the BFS of HFs is first-order proportional to the modal index for light propagating along the fiber and is thus extremely sensitive to its precise structural parameters. Our results highlight the possibility of using distributed Brillouin scattering measurements to perform nondestructive structural characterization of HFs, and the possibility of producing Brillouin-suppressed HFs using controlled structural variation along the fiber length.Item Open Access Brillouin suppression through longitudinal structural variation in high nonlinearity silica holey fibers(IEEE, 2006) Poletti, F.; Furusawa, K.; Yusoff, Z.; Petropoulos, P.; Broderick, N.; Monro, T.; Richardson, D.; Conference on Optical Fiber Communication (2006 : Anaheim, California)We consider longitudinal variation in the fiber structure as a method of increasing the Brillouin linewidth and threshold within high nonlinearity silica holey fibers. Strategies to control the associated variation in nonlinearity and dispersion along the fiber length are described.Item Open Access Inverse design and fabrication tolerances of ultra-flattened dispersion holey fibers(Optical Soc Amer, 2005) Poletti, F.; Finazzi, V.; Monro, T.; Broderick, N.; Tse, V.; Richardson, D.We employ a Genetic Algorithm for the dispersion optimization of a range of holey fibers (HF) with a small number of air holes but good confinement loss. We demonstrate that a dispersion of 0 +/- 0.1 ps/nm/km in the wavelength range between 1.5 and 1.6 microm is achievable for HFs with a range of different transversal structures, and discuss some of the trade-offs in terms of dispersion slope, nonlinearity and confinement loss. We then analyze the sensitivity of the total dispersion to small variations from the optimal value of specific structural parameters, and estimate the fabrication accuracy required for the reliable fabrication of such fibers.Item Metadata only Realistic designs of silica hollow-core photonic bandgap fibers free of surface modes(IEEE, 2006) Amezcua-Correa, R.; Broderick, N.; Petrovich, M.; Poletti, F.; Richardson, D.; Finazzi, V.; Monro, T.; Conference on Optical Fiber Communication (2006 : Anaheim, California)By systematically studying feasible silica PBGFs core structures we identify new designs regimes that robustly eliminate the presence of surface modes. New realistic fibers designs with a fundamental mode free of anticrossings at all frequencies within the bandgap are proposed.Item Open Access The effect of core asymmetries on the polarization properties of hollow core photonic bandgap fibers(Optical Soc Amer, 2005) Poletti, F.; Broderick, N.; Richardson, D.; Monro, T.We present the results of numerical simulations of the modal properties of Photonic Band Gap Fibers (PBGFs) in which a structural distortion of the silica ring surrounding the air core is gradually introduced. We demonstrate that surface modes supported within such fibers are very sensitive to structural distortions, and that any asymmetric change in the structure can break their degeneracy resulting in associated changes in the anticrossing behavior of the orthogonally polarized core modes, and the development of polarization dependent transmission properties. Our results provide insight into recent experimental observations of wavelength dependent PDL and birefringence in PBGFs.Item Metadata only Ultra-flattened dispersion holey fibers: genetic algorithm design and fabrication tolerances(CLEO/QELS, IEEE, 2005) Poletti, F.; Finazzi, V.; Monro, T.; Broderick, N.; Richardson, D.; Conference on Laser and Electro-Optics (2005 : Baltimore, Md.)We design practical nonlinear holey fibers through a genetic algorithm, achieving dispersions of 0/spl plusmn/0.1 ps/nm/km between 1.5 and 1.6 /spl mu/m. The fabrication tolerances are also estimated through a dispersion sensitivity analysis.