Studying the properties of double-clad active cone optic fibers

Bagan, V. A.; Никитов, С. А.; Chamorovskii, Yuri; Shatrov, A. D.

doi:10.1134/s1064226910100098

Cited by 12 publications

(5 citation statements)

References 4 publications

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“…Once air is considered as the surrounding media, we proceed to analyze the mode field expression of the fundamental core mode within the tapered fiber. The mode field expression is an important parameter in doped fiber amplifiers because it determines the core mode fraction of the pump and signal, which affects the power conversion in the doped core [23][24][25][26][27][28]. In this study, Gaussian shapes for the pump and signal fundamental core modes were considered.…”

Section: Numerical Simulationmentioning

confidence: 99%

Temperature Sensing Characteristics of Tapered Doped Fiber Amplifiers

Sanchez-Lara¹,

Cruz-May²,

Vazquez-Avila³

et al. 2020

Optical Fiber Applications

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We numerically analyze the temperature response of tapered doped fiber amplifiers and discuss their feasibility to be used as a sensing element in temperature fiber sensors. In particular, we consider Ytterbium (Yb) and Thulium (Tm) rare earths in the tapered doped fiber designs. We have modified the coupled propagation equations for the pump and signal radiations in order to include different taper structures and introduce the temperature dependence of the absorption and emission cross-sections of Yb and Tm ions. It was found that the temperature sensitivity of the amplified signal in Tm-doped fiber amplifiers is one order of magnitude higher than this obtained with Yb-doped fibers. Additionally, in all doped fibers, the temperature sensitivity of the signal radiation is higher for low pump powers in a co-propagating pump scheme, and it highly depends on the longitudinal shape of the taper used. Finally, for both Yb-and Tm-doped fibers, the temperature sensitivity can be increased if we use doped fiber lengths shorter than 1 m and pump powers lower than 300 mW. This study provides valuable information for the development of tapered fiber amplifiers doped with other rare earths and novel designs for doped fiber temperature sensors.

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Section: Numerical Simulationmentioning

confidence: 99%

Temperature Sensing Characteristics of Tapered Doped Fiber Amplifiers

Sanchez-Lara¹,

Cruz-May²,

Vazquez-Avila³

et al. 2020

Optical Fiber Applications

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“…This assumption neglects the weaklyabsorbed pump modes and the axial variation of the overlap of the propagating mode and active medium, and the simulation only considers the fundamental mode. It has been shown earlier that the part of pump power which is vignetted (leaks out from the pump cladding due to a violation of the total internal reflection condition) is determined by the longitudinal profile rz of the T-DCF and is given by [6]:…”

Section: A Slope Efficiency Pump Absorption and Power Distributionmentioning

confidence: 99%

“…Previous studies show that the optimal T-DCF shape is moderately parabolic [3,6]. Here we have used an axial profile of the form…”

Section: A Slope Efficiency Pump Absorption and Power Distributionmentioning

confidence: 99%

“…(4), we obtain an equation describing the concentration of active ions in the excited state. The vignetting of pump power is taken into account as [6]:…”

Section: A Slope Efficiency Pump Absorption and Power Distributionmentioning

confidence: 99%

“…(10) into account, substituting Eqs. (4) and (6), and solving the final equation set, Eq. (2), we obtain the distribution of the pump [ Fig.…”

Section: A Slope Efficiency Pump Absorption and Power Distributionmentioning

confidence: 99%

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Principles and performance of tapered fiber lasers: from uniform to flared geometry

et al. 2012

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We have studied the recently demonstrated concept of fiber lasers based on active tapered double-clad fiber (T-DCF) in copropagating and counterpropagating configurations, both theoretically and experimentally, and compared the performance to fiber lasers based on conventional cylindrical fibers in end-pumped configurations. Specific properties of T-DCFs were considered theoretically using a rate-equation model developed for tapered fibers, and a detailed comparative study was carried out experimentally. Furthermore, we have studied mode coupling effects in long adiabatic tapers due to coiling and local bending. The results allow us to conclude that, with proper fiber design, the T-DCF technology offers a high-potential alternative for bright, cost-effective fiber devices.

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