Tapered fibers embedded in silica aerogel (2009)
Xiao, L. M., Grogan, M.D.W., Leon-Saval, S.G., Williams, R., England, R., Wadsworth, W.J., ...
Control of surface modes in low loss hollow-core photonic bandgap fibers (2008)
Amezcua-Correa, R., Gèrôme, F., Leon-Saval, S.G., Broderick, N.G.R., Birks, T.A., Knight, J.C.
We report on the fabrication and characterization of hollow-core photonic bandgap fibers that do not suffer from surface mode coupling within the photonic bandgap of the cladding. This enables low...
Post-processing and tapering of PCFs (2008)
Leon-Saval, S. G., Birks, T. A., Witkowska, A., Ke, Lai, Wadsworth, W. J.
New methods have been developed in post-processing and tapering of PCFs to achieve a variety of low-loss optical devices. Interfacing between waveguides with very different properties and highly...
LP01 to TE01, fibre mode convertor (2007)
Witkowska, A., Leon-Saval, S. G., Lai, K., Birks, T. A.
Mode convertors couple light from one fibre mode to another. They have applications in dispersion compensation, nonlinear optics and atom guiding for example. We demonstrate coupling from the...
Wavelength-independent all-fiber mode converters (2007)
Lai, K., Leon-Saval, S. G., Witkowska, A., Wadsworth, W. J., Birks, T. A.
Enhanced visible continuum generation from a microchip 1064nm laser (2006)
Xiong, C., Witkowska, A., Leon-Saval, S. G., Birks, T. A., Wadsworth, W. J.
All-fiber anamorphic core-shape transitions (2006)
Witkowska, A., Lai, K., Leon-Saval, S. G., Wadsworth, W. J., Birks, T. A.
Fibre core shape transitions for optical interfacing (2006)
Lai, K., Witkowska, A., Leon-Saval, S. G., Wadsworth, W. J., Birks, T. A.
Transitions in core shape are formed in photonic crystal fibres by differential pressurisation of the holes and localised heating. Low-loss anamorphic transitions to rectangular and annular cores are...
Humbert, G., Wadsworth, W. J., Leon-Saval, S. G., Knight, J. C., Birks, T. A., Russell, P. S. J., ...
Hole inflation and tapering of stock photonic crystal fibres (2005)
Wadsworth, W. J., Witkowska, A., Leon-Saval, S. G., Birks, T. A.
Splice-free interfacing of photonic crystal fibers (2005)
Leon-Saval, S. G., Birks, T. A., Joly, N. Y., George, A. K., Wadsworth, W. J., Kakarantzas, G., ...
Wavelength-independent high-extinction fibre mode convertor (2005)
Leon-Saval, S. G., Birks, T. A., George, A. K., Wadsworth, W. J., Russell, P. St J.
We have used photonic crystal fibre techniques to construct a mode converter. It couples light from LP/sub 01/ to LP/sub 11/ modes with extinction ratio >30 dB at all wavelengths from 650-1750 nm.
Single-mode performance in multimode fibre devices (2005)
Leon-Saval, S. G., Birks, T. A., Bland-Hawthorn, J., Englund, M.
We demonstrate a waveguide transition between a multimode fibre and several single-mode fibres. Splicing identical Bragg gratings between two such transitions yields a multimode fibre filter with the...
Multimode fiber devices with single-mode performance (2005)
Leon-Saval, S. G., Birks, T. A., Bland-Hawthorn, J., Englund, M.
Optical micro- and nano-structures using fibre tapers (2005)
Birks, T. A., Leon-Saval, S. G., Wadsworth, W. J., Russell, P. St J.
Tapering of conventional and photonic crystal fibres can be used to make glass-air waveguides down to submicron scales, and gives them ready-made low-loss interfaces to simplify input and output...
Guidance properties of low-contrast photonic bandgap fibres (2005)
Argyros, A., Birks, T. A., Leon-Saval, S. G., Cordeiro, C. M. B., Russell, P. S.
Photonic bandgap with an index step of one percent (2005)
Argyros, A., Birks, T. A., Leon-Saval, S. G., Cordeiro, C. M. B., Luan, F., Russell, P. S. J.
Splice-less interfacing of conventional fibers to photonic crystal fibers (2004)
Leon-Saval, S. G., Kakarantzas, G., George, A. K., Birks, T. A., Russell, P. St J.
Coupling into small-core photonic crystal fibers is not easy, even with bulk optics. By adapting the PCF fabrication technique, low-loss adiabatic transitions between single-mode fibers and...
Supercontinuum generation in submicron fibre waveguides (2004)
Leon-Saval, S. G., Birks, T. A., Wadsworth, W. J., Russell, P. S. J., Mason, M. W.
All-fiber devices based on sol-gel coated tapered fibers (2004)
Kakarantzas, G., Leon-Saval, S. G., Birks, T. A., Russell, P. St J.
Low-loss porous silica films were deposited onto tapered fibers in minutes. By periodically varying the film's porosity with a CO2 laser, we demonstrated a new type of thermally-stable structural...