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Hydrogen-induced-losses due to the reaction at 4 degrees C after 25 yr were estimated by chemical kinetics in dispersion-shifted and standard fibres. The loss increases at 1.3 and 1.55 mu m were negligibly small in both fibres, although exposure to hydrogen at 1 atm was assumed.<<ETX>>
Shows that fibre-coupled open resonator Fabry-Perot interferometers can be made with reduced insertion loss due to diffraction by using fibre with slightly larger mode size. For a 50% increase in mode size, the insertion loss is reduced by 3-4 dB for a 7 mu m-long resonator at 1.5 mu m wavelength.<<ETX>>
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