During the last decades, both governments and companies have been committed to the
continuous checking of biological parameters, which can prevent extra costs to …

Fiber optic devices are being increasingly employed in the fields of chemical and
environmental sensing due to their important features, such as high accuracy, small size …

The sensors measuring torsion, refractive index, and temperature are demonstrated, based
on an improved helical long-period fiber gratings (HLPFG), in which the refractive-index and …

A strain sensor based on cascaded Sagnac loops with two polarization-maintaining
photonic crystal fibers (PMPCFs) has been experimentally demonstrated. Air holes …

Reflector-less biosensors based on optical fibers enable the detection of the refractive index
(RI) variations, in reflection mode, without the need for any reflective element (such as a …

Based on Sagnac interferometer, we proposed a force sensor with simple structure by
embedding a short of polarization-maintaining photonic crystal fiber (PM-PCF) into Sagnac …

We present a novel strain sensor based on a hybrid Fabry–Perot interferometer (HFPI),
which is mainly constructed by a cascade of a suspended-core fiber (SCF) and a hollow …

A long period fiber grating prepared by multimode fibers (MMF-LPFG) is proposed and
experimentally demonstrated as a sensitivity-enhanced strain sensor. The core diameter …

Double-clad fibers where the second cladding has a lower refractive index than the first
cladding, prove to be ideal structures for potentiating and tuning the sensitivity in long-period …

A highly sensitive optical fiber strain sensor is presented in this work. The structure of the
device consists of cascaded multimode fiber (MMF) and photonic crystal fiber (PCF), fusion …