With the oil and gas industry growing rapidly, increasing the yield and profit require
advances in technology for cost-effective production in key areas of reservoir exploration …

We demonstrated femtosecond laser inscription of fiber Bragg gratings (FBGs) in a twin-core
few-mode fiber (TC-FMF) for directional bend sensing. An FBG was selectively inscribed in …

In this work, we have demonstrated a cladless few-mode fiber grating sensor for
simultaneous measurement of refractive index (RI) and temperature. The proposed sensor is …

Helical fiber Bragg grating (H-FBG) induced by UV-side exposure exhibits wavelength-
dependent coupling between different modes. In this paper, we propose an effective method …

We present the results on fabrication and the characterization of few-mode fiber Bragg
gratings (FM-FBGs) inscribed in two mode and four mode step-index fibers. Under the …

Off-axis Bragg gratings with varied horizontal and vertical distances off the center in a step-
index two-mode fiber were fabricated by 800 nm infrared-femtosecond laser pulses through …

We propose and experimentally demonstrate a high-order mode fiber laser based on few-
mode fiber gratings. The fiber laser has the structure of three sub-ring-cavities. LP 01 mode …

We demonstrate the fabrication of long-period fiber gratings (LPFGs) in an elliptical core few-
mode fiber (e-FMF) by CO_2 laser. The mode conversion from fundamental mode to high …

In this work, we demonstrate the measurement of the Brillouin gain spectra of vector modes
in a few-mode fiber for the first time using a simple heterodyne detection technique. A …

In this Letter, we report the fabrication of fiber Bragg gratings (FBGs) in home-made Ho^
3+/Pr^ 3+ co-doped single-cladding fluoroaluminate (AlF_3) glass fibers and its application …