Long period fiber grating

It is an optical fiber structure with the properties . In essence, a long period fibre grating (LPFG) is an all-fibre device with wavelength dependent loss. Temperature, strain, and refractive-index resolutions of 0. Recent research on fibre optic long - period gratings (LPGs) is reviewed with emphasis placed upon the characteristics of LPGs that make them attractive. Sensing performances of ultrashort (as low as mm) long - period fiber gratings fabricated with COlaser radiation using commercial single mode fibers are presented.

These lengths are, to our knowledge, the shortest of those found in the literature for this kind of sensors, approaching those .

A novel bend-insensitive long - period fiber grating (LPFG) sensor written using focused COlaser pulses is demonstrate for the first time, to our knowledge.

The first biosensor based on long - period fiber grating (LPFG) for virus, i. The LPFGs were tuned up to their highest refractive index sensitivity and modified with antibodies. Long period fiber grating based on periodically screw-type distortions for torsion sensing. Mi Deng, Jinshan Xu, Zhe Zhang, Zhiyong Bai, Shen Liu, Ying Wang, Yan Zhang, Changrui Liao, Wei Jin, Gangding Peng, and Yiping Wang. Long - period fiber - grating -based gain equalizers. Turan Erdogan, Cladding-mode resonances in short- and long - period fiber grating filters: errata, J. First, various fabrication techniques based on COlaser irradiations are demonstrated to write LPFGs in different types of optical fibers such as conventional glass fibers, solid-core photonic crystal . Photoinduced periodic structures written in the core of standard communication-grade fibers couple light from the fundamental guided mode to forward propagating cladding modes and act as spectrally . We have shown that removal of multiple resonant bands due to unwanted phase shift introduced after cleaving the grating at an arbitrary . PROPERTIES AND SENSING APPLICATIONS OF LONG - PERIOD GRATINGS by . María Guadalupe Pulido-Navarro, Ponciano Jorge Escamilla-Ambrosio, Sigifredo Marrujo-García, José Alfredo Álvarez-Chávez, and Fernando Martínez-Piñón.

Wenhua Guo, Patrik Holmberg, Fredrik Laurell, and Michael Fokine. We have experimentally investigated the mode dispersion property and refractive index sensitivity of dual-peak long - period fiber gratings (LPGs) that were sensitized by hydrofluoric acid (HF) etching. The nature of the coupled cladding modes close to the dispersion turning point makes the dual-peak LPGs ultrasensitive to . The fabrication method is simple and does not require special fibers.

The method of femtosecond laser inscription by slit-apertured beam is applied for fabrication of long - period fiber gratings in polarization-maintaining Panda-type fiber. Polarization properties as well as ambient refractive index sensitivity are investigated for the inscribed gratings. It is shown that the method allows us to create . We propose two types of nano-structured film to deposit on surface of the grating region by .