The use of sensors in the real world is on the rise, providing information on medical
diagnostics for healthcare and improving quality of life. Optical fiber sensors, as a result of …

In recent years, optical fiber sensors based on multimode interference (MMI) have attracted
increasing interest and developed into various sensors used in many practical applications …

This paper presents an investigation on a single-mode–multimode–single-mode fiber
structure. A one-way guided-mode propagation analysis for the circular symmetry …

A new concept for a fiber-based wavelength-tunable condensing lens is theoretically and
experimentally investigated in terms of its ability to shift the longitudinal focus position as a …

A fiber-optic curvature sensor based on the single-mode-multimode-single-mode (SMS)
fiber structure is developed. Several notches in the transmitted spectrum of the SMS fiber …

A novel all-fiber refractometer sensor is proposed, which is based on multimode interference
in the multimode fiber core section sandwiched between two single-mode fibers. A wide …

We report a low-loss, low-cost high-sensitivity all-fiber strain and temperature sensor based
on mode interference in graded-index multimode fibers. Blueshifts with strain and …

We demonstrate a mode-locked all-fiber Tm laser using a single mode-step index multimode-
graded-index multimode-single mode fiber structure as a saturable absorber based on the …

A detailed investigation of the nonlinear multimodal interference in a short graded-index
multimode optical fiber is presented. The analysis is performed for a specific device …

The proposed sensing device relies on the self-imaging effect that occurs in a pure silica
multimode fiber (coreless MMF) section of a single-mode–multimode–single-mode (SMS) …