Broadband Superfluorescent Source Based on Bismuth-Doped GeO2-SiO2 Fiber

The first bismuth-doped superfluorescent fibersource operating at 1.44-μm was developed. Atpump power of 200 mW and pump wavelength of1310 nm, its output signal reaches 57 mW withspectrum width of 25 nm

Soliton Resonances in Dispersion Oscillating Optical Fibers

Abstract-A novel method to increase the pulse repetition rate by means of fission of secondorder solitons in the fiber with periodically modulated dispersion is studied. The experiments confirm the results of numerical simulations. The efficient doubling of the pulse repetition rate takes place in dispersion oscillating fiber (DOF). Good agreement between theory and experiment was obtained

IR Bismuth active centers in optical fibers: Combined excitation-emission spectroscopy

3D excitation-emission luminescence spectra of Bi-doped optical fibers of various compositions were measured in a wide wavelength range 450-1700 nm. Such luminescence spectra were obtained for Bi-doped pure silica and germania fibers, and for Bi-doped Al- or P-codoped silica fibers (at room and liquid nitrogen temperatures). The energy level schemes of IR bismuth active centers in pure silica and germania core fibers were derived from spectra obtained. The energy level schemes similarity of bismuth active centers in these two types of fibers was revealed.Comment: 12pages, 7 figures, 5 table

Study of incorporation efficiency of different precursor salts in fabrication of rare-earth doped optical fibers

A comparative study on the influence of different precursor salts of Er and Al for fabrication of rare-earth-doped optical fibers by modified chemical vapor deposition-solution doping is presented. Experimental results reveal that among the different precursor salts under investigation halide precursors exhibit the highest incorporation efficiency. A plausible explanation of the observed result is proposed. The results of a model conductivity experiment support our proposition

Erbium-doped fibers based on cesium-silicate glasses

Using modified chemical vapor deposition and solution doping techniques, erbium-doped fibers (EDFs) were prepared based on cesium-silicate glasses. The possibility of manufacturing high-concentration (1-13 wt%) EDFs was shown, and a fiber structure was realized by means of direct doping of cesium-silicate glass with erbium ions. The optical, fluorescence, and gain properties of prepared samples were examined. A maximum gain of 25 dB at 1538 nm was achieved in the fiber at an optimum length of 30 cm at a pump power of 50 mW at 979 nm. (C) 2000 Academic Press.61616

InorgMat9_07BubnovLO

Abstract -The GeO 2 yield in the reaction between GeCl 4 and oxygen has been determined as a function of the reaction time under typical MCVD fiber preform fabrication conditions. It is shown that the yield increases steadily over time and may attain 100%. In the case of the cooxidation of germanium and silicon tetrachlorides under the same conditions, there is an optimal reaction time corresponding to a maximum in GeO 2 yield. The temperature profile along the reaction zone has been optimized in terms of germania yield