The control and measurement of humidity are closely related to the daily-life of human. The
accurate measurement of humidity plays an important role in food safety, environmental …

We demonstrate the fabrication of long-period fiber gratings (LPFGs) written in the two-mode
fiber (TMF) by CO_2 laser. Both uniform and tilted LPFGs were fabricated to provide the light …

This paper presents a systematic review of long period fiber gratings (LPFGs) written by the
CO 2 laser irradiation technique. First, various fabrication techniques based on CO 2 laser …

We demonstrate a simple and highly sensitive optical fiber relative humidity (RH) sensor
based on a long-period fiber grating (LPFG) coated with polyethylene glycol (PEG)/polyvinyl …

We fabricate mode converters by directly writing long-period gratings in a two-mode fiber
with a CO 2 laser. These mode converters allow the fundamental LP 01 mode to be …

A peanut-shape fiber structure that can realize the coupling and recoupling between the
fiber core mode and the cladding modes is proposed in this paper. Based on the structure, a …

We propose and demonstrate an optical fiber vector curvature sensor based on a long-
period fiber grating (LPFG) inscribed in Panda type polarization-maintaining fiber (PMF) …

We report a fiber-optic sensor for pH measurement, which is a long-period fiber grating
(LPFG) coated with smart hydrogel. When the pH of a solution that surrounds the hydrogel …

A chiral long-period grating (CLPG) was fabricated successfully by scanning CO 2 laser in a
twisted conventional single-mode fiber. The strong mode coupling can be achieved in a …

A robust graphene-coated in-fiber Mach-Zehnder interferometer (MZI) formed with a pair of 3-
dB long-period fiber gratings is proposed and demonstrated for ammonia (NH 3) gas …