Quantitative Analysis of Coherence Length and Phase Noise Effects on Interferometric Fiber Optic Sensors

Cebesoy E. Y. C., DOLMA A.

8th International Congress on Human-Computer Interaction, Optimization and Robotic Applications, ICHORA 2026, Ankara, Türkiye, 21 - 23 Mayıs 2026, (Tam Metin Bildiri)

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Doi Numarası: 10.1109/ichora69329.2026.11537120
  • Basıldığı Şehir: Ankara
  • Basıldığı Ülke: Türkiye
  • Anahtar Kelimeler: coherence length, Fabry-Pérot, interferometric fiber optic sensors, Mach-Zehnder, MATLAB, Michelson, phase noise, Sagnac
  • Kocaeli Üniversitesi Adresli: Evet

Özet

Interferometric fiber optic sensors offer high accuracy due to their phase difference-based measurement principles and are widely used in many industrial applications. However, the performance of these sensors is directly affected by fundamental physical parameters such as phase noise and the coherence length of the optical source. In this study, the effects of phase noise and coherence length on interferometric sensor performance were investigated using analytical expressions. In this study, the effect of phase noise on the minimum detectable length variation and the role of coherence length on interference visibility were analyzed separately. However, to evaluate the combined effect of these two parameters on system behavior, a multiparameter analysis approach was developed, and system performance was examined using an effective visibility-based model. In this context, the system behavior for different coherence lengths and the effect of phase noise on the minimum detectable length were numerically analyzed and graphically evaluated in the MATLAB. Furthermore, Mach-Zehnder, Michelson, Fabry-Perot, and Sagnac interferometric structures were evaluated comparatively, and performance differences under different operating conditions were revealed. The results show that a high coherence length alone is not sufficient, and that phase noise is also a critical parameter determining sensor performance. This study presents an analytical framework that considers both phase noise and coherence length for evaluating the performance of interferometric fiber optic sensors and provides an application-oriented assessment in terms of sensor design and optical source selection.