Temperature-Insensitive Fiber Bragg Grating-Based Bending Sensor Using Radio-Freqeuncy-Modulated Reflective Semiconductor Optical Amplifier

Abstract

A novel method for the temperature-insensitive measurement of the bending of a cantilever plate is proposed. It is based on the radio-frequency (RF) power measurement of the beat signal that has been generated from a dual fiber Bragg grating (FBG)-based sensing head. Another noticeable feature is that a sine-modulated amplified spontaneous emission from a directly modulated reflective semiconductor optical amplifier (RSOA) is employed as a broadband light source. (C) 2009 The Japan Society of Applied Physics