Mechanically induced long period fiber gratings on single mode tapered optical fiber for structure sensing applications

2015 ◽  
Author(s):  
María G. Pulido-Navarro ◽  
Sigifredo Marrujo-García ◽  
José A. Álvarez-Chávez ◽  
Jesús S. Velázquez-González ◽  
Fernando Martínez-Piñón ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Single Mode ◽  
Fiber Gratings ◽  
Long Period ◽  
Sensing Applications ◽  
Long Period Fiber Gratings ◽  
Tapered Optical Fiber

scholarly journals Tunable Optical Filter Based on Mechanically Induced Cascaded Long Period Optical Fiber Grating

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Sunita P. Ugale ◽  
Vivekanand Mishra
Keyword(s):  
Optical Fiber ◽  
Optical Filter ◽  
Single Mode ◽  
Fiber Grating ◽  
Fiber Structure ◽  
Fiber Gratings ◽  
Long Period ◽  
Tunable Optical Filter ◽  
Long Period Fiber Gratings ◽  
Optical Fiber Gratings

We have proposed and demonstrated experimentally a novel and simple tunable optical filter based on mechanically induced and cascaded long period optical fiber gratings. In this filter variable FWHM and center wavelength is provided by cascading long period and ultralong period optical fiber gratings with different periods in a novel fiber structure. We report here for the first time to our knowledge the characterization of mechanically induced long period fiber gratings with periods up to several millimeters in novel multimode-single-mode-multimode fiber structure. We have obtained maximum loss peak of around 20 dB.

scholarly journals Immunosensor Based on Long-Period Fiber Gratings for Detection of Viruses Causing Gastroenteritis

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 813 ◽  
Author(s):  
Marta Janczuk-Richter ◽  
Beata Gromadzka ◽  
Łukasz Richter ◽  
Mirosława Panasiuk ◽  
Karolina Zimmer ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Medical Diagnostics ◽  
Label Free ◽  
Fiber Gratings ◽  
Fast Detection ◽  
Long Period ◽  
Highly Sensitive ◽  
Protein Receptors ◽  
Long Period Fiber Gratings ◽  
Vaccine Testing

Since the norovirus is the main cause of acute gastroenteritis all over the world, its fast detection is crucial in medical diagnostics. In this work, a rapid, sensitive, and selective optical fiber biosensor for the detection of norovirus virus-like particles (VLPs) is reported. The sensor is based on highly sensitive long-period fiber gratings (LPFGs) coated with antibodies against the main coat protein of the norovirus. Several modification methods were verified to obtain reliable immobilization of protein receptors on the LPFG surface. We were able to detect 1 ng/mL norovirus VLPs in a 40-min assay in a label-free manner. Thanks to the application of an optical fiber as the sensor, there is a possibility to increase the user’s safety by separating the measurement point from the signal processing setup. Moreover, our sensor is small and light, and the proposed assay is straightforward. The designed LPFG-based biosensor could be applied in both fast norovirus detection and in vaccine testing.

scholarly journals Ultrashort Long-Period Fiber Gratings Inscribed on a Single-Mode Fiber for Torsion Sensing Applications

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Marta Nespereira ◽  
João M. P. Coelho ◽  
José Manuel Rebordão
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Wavelength Shift ◽  
Fiber Grating ◽  
Long Period ◽  
Sensing Applications ◽  
High Tension ◽  
Long Period Fiber Gratings ◽  
Order Of Magnitude ◽  
Period Fiber Grating

The response of ultrashort-length CO2-induced long-period fiber grating (LPFG) sensors to torsion is reported. While engraving using CO2 laser radiation, the fiber is submitted to high tension allowing the obtainment of gratings with shorter lengths, down to 2.4 mm, which is almost one order of magnitude lower than the usual. Also, the fiber is only irradiated in one side, creating an asymmetrical profile leading to highly birefringent gratings. Sensitivity to axial twists is demonstrated, with values up to 0.15 nm/(rad/m) for the resonant wavelength shift and higher than 0.03 dBm/(rad/m) for the variation in the intensity (attenuation). Discrimination between rotation directions, clockwise and counterclockwise, was observed.

Resonance peak shift and dual peak separation of long-period fiber gratings for sensing applications

2001 ◽  
Vol 13 (7) ◽  
pp. 699-701 ◽  
Author(s):  
Young-Geun Han ◽  
Byeong Ha Lee ◽  
Won-Taek Han ◽  
Un-Chul Paek ◽  
Youngjoo Chung
Keyword(s):  
Peak Shift ◽  
Resonance Peak ◽  
Fiber Gratings ◽  
Long Period ◽  
Peak Separation ◽  
Sensing Applications ◽  
Long Period Fiber Gratings

Fabrication of long period fiber gratings based on embedded-core hollow optical fiber

2014 ◽  
Author(s):  
Chunying Guan ◽  
Xing Zhong ◽  
Xiaozhong Tian ◽  
Shuqiang Li ◽  
Libo Yuan
Keyword(s):  
Optical Fiber ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings

CO 2 -laser induced long-period fiber gratings in nano-engineered bend insensitive single-mode fiber

2012 ◽  
Author(s):  
Yunjiang Rao ◽  
Wenhua Wang ◽  
Zinan Wang ◽  
Kin Seng Chiang ◽  
Yuan Gong
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings

scholarly journals Sensing and Demodulation of Special Long-Period Fiber Gratings Induced by ScanningCO2Laser Pulses

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
Tao Zhu ◽  
Leilei Shi ◽  
Min Liu ◽  
Wei Huang
Keyword(s):  
Single Mode ◽  
Laser Pulses ◽  
Single Mode Fiber ◽  
Wavelength Shift ◽  
Refractive Index Sensor ◽  
Fiber Gratings ◽  
Long Period ◽  
Investigation Methods ◽  
Long Period Fiber Gratings ◽  
Sensor Strain

A review of long-period fiber gratings (LPFGs) with special structures induced by scanning CO2laser pulses in single mode fiber (SMF) is presented in this paper. In the first part, the special structures and fabrication methods of LPFGs are demonstrated in detail. Next, the special LPFG-based sensors are demonstrated, such as refractive index sensor, strain sensor with temperature compensation, and torsion sensor without temperature crosstalking. Finally, several investigation methods including intensity, wavelength shift, and fiber ring laser demodulation are discussed.

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