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Chromatic dispersion measurement of optical fibres using interferometric technique
Dymák, Pavel ; Peterka, Pavel
Research report deals with measurement of chromatic dispersion of singlemode optical fibres using interferometric technique at IREE AS CR in Prague. The document describes in details all components of measurement setup, initial setting up and measurement procedure, using of assembled control programs and the measurement data processing too. Several tips and practical recommendations complete the report based on many performed experiments.
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Optimal fibre cross section shape for cladding-pumped fibre lasers and amplifiers
Peterka, Pavel ; Kašík, Ivan ; Matějec, Vlastimil
The efficiency of the cladding-pumped fibre amplifier critically depends on the coupling of the pump radiation from the inner cladding to the single mode signal core, doped with rare earth ions /Er, Yb, .../. This coupling depends on the cross sectional shape of the inner cladding. In the paper, the conditions of the optimal shape are defined. Verification of these conditions in case of several specific examples, including experimental fibre prepared in the author's laboratory, is shown.
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Pump-controlled gain-locked Raman fibre amplifier
Karásek, Miroslav
Preliminary results of numerical simulation of pump-controlled, gain-locked Raman fibre amplifier have been presented. Numerical model of the gain-locked amplifier is based on interative solution of propagation equations for pumps, signals and spectral components of amplified spontaneous emission. Proportional-derivative feedback loop which controls the pump power has been implemented. Suppression of surviving channel power fluctuations due to channel addition/removal has been investigated.
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Power transients in Raman fiber amplifiers
Karásek, Miroslav
Output power transient in Raman fibre amplifiers /RFA/ have been investigated both theoretically and experimentally. Large signal numerical model of RFA has been used for the analysis. It has been that substantial power transients can occur when WDM channels are dropped/added.
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Fiber lasers
Peterka, Pavel
Success of erbium doped fiber amplifiers in telecommunications stimulated also recent developments in the field of fiber lasers. Basic principles of fiber amplifiers and lasers are overviewed in the paper. Some applications of fiber lasers are described as well.
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