title: Balanced polarization maintaining fiber Sagnac interferometer vibration sensor.
abstract: To achieve a nearly zero-delay operating point in a polarization-maintaining (PM) fiber Sagnac interferometer, two identical PM fibers were incorporated so that their two main axes were orthogonally coupled to each other. A simple fiber vibration sensor system was constructed with a light emitting diode and a balanced PM fiber Sagnac interferometer, in which one of the PM fibers was used as a sensing cable and the other as a reference cable. The vibration sensor was confirmed to be temperature-compensated and generated a phase shift per unit length and unit strain of the sensor of 4.7 milliradian/(m·με) when mechanical vibrations with 1 kHz sinusoidal and triangular waves were stably observed under an input power of 10 μW.
authors: Department of Physics & Electronics, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai-shi, Osaka 599-8531, Japan. wada@pe.osakafu-u.ac.jp
authors: Kenji
authors: K
authors: Wada
authors: Hirokazu
authors: H
authors: Narui
authors: Daiki
authors: D
authors: Yamamoto
authors: Tetsuya
authors: T
authors: Matsuyama
authors: Hiromichi
authors: H
authors: Horinaka