[PDF]    http://dx.doi.org/10.3952/lithjphys.50111

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 50, 63–68 (2010)


NUMERICAL ANALYSIS OF SIGNAL GAIN AND NOISE FIGURE OF S-BAND Tm-DOPED W-TYPE FIBRE AMPLIFIER WITH DIFFERENT PUMPING CONFIGURATIONS
M.A. Khodasevich, S.A. Koval, and G.V. Sinitsyn
B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Nezalezhnasti Ave. 68, 220072 Minsk, Belarus
E-mail: m.khodasevich@ifanbel.bas-net.by

Received 13 October 2009; revised 15 February 2010; accepted 19 March 2010

A completely spectrally and spatially resolved theoretical model of a silica-host thulium-doped fibre amplifier is presented. In contrast to the models reported so far, multimodal structure of emission is taken into account. Several promising pumping schemes are considered. Genetic algorithm is implemented for pumping scheme optimization to attain the maximum gain or minimum gain ripple. W-type and step-index fibre performance is compared. The results obtained allow to select the best parameters for each considered scheme.
Keywords: thulium-doped fibre amplifier, W-type fibre, genetic algorithm
PACS: 42.81.-i, 42.55.Wd, 42.81.Wg


SIGNALO STIPRINIMO IR TRIUKŠMŲ LYGIO SKAITMENINĖ ANALIZĖ S JUOSTOS SU Tm PRIEMAIŠA W TIPO ŠVIESOLAIDINIAME STIPRINTUVE ESANT ĮVAIRIOMS KAUPINIMO KONFIGŪRACIJOMS
M.A. Khodasevich, S.A. Koval, G.V. Sinitsyn
Baltarusijos nacionalinės mokslų akademijos B.I. Stepanovo fizikos institutas, Minskas, Baltarusija

Pristatytas silicio oksido šerdies su tulio priemaišomis šviesolaidinio stiprintuvo teorinis modelis, visiškai atskiriantis spektrinius ir erdvinius parametrus. Palyginti su anksčiau siūlomais modeliais, pastarasis atsižvelgia į daugiamodės spinduliuotės sandarą. Aptarta keletas perspektyvių kaupinimo schemų. Genetinis algoritmas pritaikytas kaupinimo schemai optimizuoti siekiant maksimalaus stiprinimo arba minimalių stiprinimo pulsacijų. Palygintos W tipo ir laiptinio lūžio rodiklio šviesolaidžių eksploatacinės charakteristikos. Gauti rezultatai kiekvienai aptartai schemai leidžia parinkti geriausius parametrus.


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