Temperature sensing characteristics of tapered Yb-doped fiber amplifiers

Álvarez-Chávez, J. A.; Pérez-Sánchez, G. G.; Ceballos-Herrera, Daniel E.; Rodríguez-Rodríguez, Joaquín H; Thomas, Sabu

doi:10.1016/j.ijleo.2013.04.052

Cited by 8 publications

(8 citation statements)

References 21 publications

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“…Diverse temperature sensors based on optical fibers have been projected over the last few years [13][14][15]. These optical sensing platforms are aligned to different techniques, such as FBG [16,17], Surface Plasmon Resonance (SPR) [18,19], side-polished fibers [20,21], photonic crystal fibers (PCF) [22][23][24], fiber FP interferometers [25][26][27][28][29], and tapered fibers [30,31]. Of the two types of fibers-glass and plastic optical fiber (POF) [32,33] is considered particularly advantageous owing to its excellent flexibility, easy handling, great numerical aperture, large diameter, and the fact that plastic is able to resist smaller bend radii more than glass [33,34].…”

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confidence: 99%

Optical Fiber Temperature Sensors and Their Biomedical Applications

Roriz

Silva

Frazão

et al. 2020

Sensors

129

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The use of sensors in the real world is on the rise, providing information on medical diagnostics for healthcare and improving quality of life. Optical fiber sensors, as a result of their unique properties (small dimensions, capability of multiplexing, chemical inertness, and immunity to electromagnetic fields) have found wide applications, ranging from structural health monitoring to biomedical and point-of-care instrumentation. Furthermore, these sensors usually have good linearity, rapid response for real-time monitoring, and high sensitivity to external perturbations. Optical fiber sensors, thus, present several features that make them extremely attractive for a wide variety of applications, especially biomedical applications. This paper reviews achievements in the area of temperature optical fiber sensors, different configurations of the sensors reported over the last five years, and application of this technology in biomedical applications.

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confidence: 99%

Optical Fiber Temperature Sensors and Their Biomedical Applications

Roriz

Silva

Frazão

et al. 2020

Sensors

129

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“…It can be noted that for tapered Yb-doped fiber amplifiers, the differences of the cross-point length observed in such taper schemes (forward taper and backward taper) are negligible. 13 In Fig. 2, for the backward taper scheme, it can also observed that the cross-point length in incises (d), (e), and (f) highly depends on the tapered core profile and shifts from 0.1 to 0.4 m according to the suffix i ¼ 1, 2, 3, respectively.…”

Section: Numerical Experiment Results and Discussionmentioning

confidence: 81%

“…In this context, the taper length required to obtain the power conversion in holmiumdoped fiber amplifiers is lower than these required in other rare-Earth-doped fiber amplifiers. 13,14 Then holmium-doped fiber amplifiers can offer an opportunity to develop more compact temperature fiber sensors. In this sense, further analysis needs to be performed to optimize the temperature sensitivity using different taper ratios and the longitudinal shape of the tapered holmium-doped-fiber by employing more reduced fiber lengths.…”

Section: Numerical Experiment Results and Discussionmentioning

confidence: 99%

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Thermal effects on tapered holmium-doped fiber amplifiers

et al. 2020

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The temperature response of a tapered holmium-doped fiber amplifier and its impact in the performance of fiber lasers and temperature fiber sensors has numerically been analyzed. Different pump schemes and different longitudinal shapes of the tapered-doped fiber were investigated, and it was found that a parabolic shape of the tapered fiber amplifier in a co-propagating pump scheme shows the highest sensitivity to temperature changes. In particular, the temperature sensitivity of the amplified signal was 2.5 × 10 −4°C for 1 W of pump power and 1 m of doped fiber length. In addition, this sensitivity can be increased up to 10 times for fiber lengths shorter than 1 m and pump powers lower than 300 mW. Our results can be used to describe the temperature response of tapered fiber amplifiers in the mid-infrared spectral region and contribute with new information for the development of fiber lasers and fiber temperature sensors.

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“…If we consider the pump power at any value of z, we have [30] P p,s z ðÞ¼ On these equations, we assume that the fiber is doped with uniform Yb concentration up to the core radius "a" which depends on z. Besides, it is worth to note that n 1 T ðÞ and n 2 T ðÞ depend on f p,s r ðÞdue to their relation with I p and I s intensities.…”

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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Temperature sensing characteristics of tapered Yb-doped fiber amplifiers

Cited by 8 publications

References 21 publications

Optical Fiber Temperature Sensors and Their Biomedical Applications

Optical Fiber Temperature Sensors and Their Biomedical Applications

Thermal effects on tapered holmium-doped fiber amplifiers

Temperature Sensing Characteristics of Tapered Doped Fiber Amplifiers

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