Our optical waveguides are silica capillaries filled with xenon at atmospheric pressure. Outside the capillary helium gas "outer cladding" insures a positive refractive index difference Δn between core and cladding. The propagation losses have been calculated and compared to some preliminary measurements. In such fibers, the attenuation is high because once infrared light is injected, several hgih order modes are excited. We are studying the low loss properties of tapered xenon-core capillary.
We are studying the loss and the dispersion compensation properties of tapered silica capillary for applications in multiwavelength optical communications. The 40-micron Xenon core (1.000702 refractive index) is confined by a 22-mm wall thickness silica capillary. The wall presents Fabry-Perot resonances at 55-nm intervals in the 1500-nm band. With resonances as sharp as 1.5 nm such capillaries could serve as stable inexpensive fibered Fabry-Perot reference filters and also serve as chromatic dispersion compensators. Helium gas (1.000035 refractive index) surrounds the capillary. Extensive numerical simulations and experimental results show that including gases in the core and the external medium allows low-loss propagation of the power and support monomode guidance. This new structure will provide strong dispersion compensation for this device.
We are studying the frequency selective properties of a tapered silica capillary for applications in multiwavelength optical
communications. The 22-nm wall thickness capillary presents Fabry-Perot resonances at 6.4 THz intervals in the 1500-nm
band. With resonances as sharp as 1 .5 nm such capillaries could serve as stable inexpensive fibered Fabry-Perot reference
filters.
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