Dopants concentration effects on the wavelength shift of long-period fiber gratings used as liquid level detectors

Barerem-Melgueba Mao; Bin Zhou

doi:10.1117/12.904611

29 November 2011 Dopants concentration effects on the wavelength shift of long-period fiber gratings used as liquid level detectors

Barerem-Melgueba Mao, Bin Zhou

Author Affiliations +

Proceedings Volume 8307, Passive Components and Fiber-Based Devices VIII; 83070W (2011) https://doi.org/10.1117/12.904611
Event: SPIE/OSA/IEEE Asia Communications and Photonics, 2011, Shanghai, China

Abstract

Two liquid level sensors based on different long-period fiber gratings are proposed and compared. The long-period gratings have the same characteristics (length, grating period) but are fabricated in different optical fibers (photosensitive B-Ge codoped optical fibers with different dopants concentrations). The principle of this type of sensor is based on the refractive index sensitivity of long-period fiber gratings. By monitoring the resonant wavelength shifts of a given attenuation band, one can measure the immersed lengths of long-period fiber gratings and then the liquid level. The levels of two different solutions are measured. The maximum shift (7.69 nm) of the investigated resonance wavelength was observed in LPG1 (fabricated in Fibercore PS1250/1500). By controlling the fiber dopants concentrations one can improve the readouts of a fiber-optic liquid level sensor based on long-period fiber gratings.

Citation Download Citation

Barerem-Melgueba Mao and Bin Zhou "Dopants concentration effects on the wavelength shift of long-period fiber gratings used as liquid level detectors", Proc. SPIE 8307, Passive Components and Fiber-Based Devices VIII, 83070W (29 November 2011); https://doi.org/10.1117/12.904611

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