Temperature sensor based on an erbium-doped fiber Sagnac interferometer

Abstract

The development of a highly sensitive all-fiber temperature sensor based on a Sagnac interferometer configuration is demonstrated here. We use 10 m of an erbium-doped fiber (EDF) as a passive sensing element inside the Sagnac loop, taking advantage of the extra birefringence added by the presence of the doping elements. Using a standard interrogation method of simply tracing a interference peak, we were able to detect temperature variations with a sensitivity of up to 0.2 nm/°C and high linearity. The results demonstrate, for the first time, that the usage of an EDF as a totally passive element can be an interesting option to extend the range of parameter possibilities achievable for highly sensitive temperature sensors.

Sagnac interferometry and the impact of conductivity-dependent Raman gain on rotary photon drag

“…Furthermore, theoretical investigations on PD in a Mach-Zehnder (MZ)-type SI using a Kerr-free atomic medium have been conducted achieving drag angles in micro-radians [44]. Rotation sensing using a multi-loop atomic SI was also proposed [45], and Pizzaia and his colleagues recently demonstrated a temperature sensor using a SI [46]. In a recent theoretical investigation, Ullah et al [47] enhanced the RPD angles from micro-radians to centi-radians in a MZ-type SI.…”

A Micro-Mach–Zehnder Interferometer Temperature Sensing Design Based on a Single Mode–Coreless–Multimode–Coreless–Single Mode Fiber Cascaded Structure

“…Temperature sensors are widely used, and the main types of fiber optic temperature sensors are Sagnac interferometric [7][8][9], fiber Bragg grating [10][11][12], special fiber optic [13][14][15] and cascade sensors [16][17][18]. Lim et al proposed a Sagnac interferometer, which is composed of two polarization-maintaining fibers, and its temperature sensitivity can reach 65.3 pm/°C [19].…”

PANDA Fiber Sagnac Interferometer for Temperature Sensor Application

“…To date, several approaches have been presented for temperature sensing including grating based optical fibers, fiber loop mirror of high birefringence fibers and hybrid fiber structure [10][11][12][13][14][15][16][17][18][19]. Each sensing configuration comprises different structures and sensing material to achieve high temperature sensitivity.…”