Several schemes for classification of fiber optic sensors have been developed, from different points of view, ranging from the essentially straightforward methods used in a simple survey, such as those based on the physical quantity to be transduced, through to the use. Several schemes for classification of fiber optic sensors have been developed, from different points of view, ranging from the essentially straightforward methods used in a simple survey, such as those based on the physical quantity to be transduced, through to the use. Optical fiber sensors (OFSs) have emerged as essential tools in the monitoring of physical, chemical, and bio-medical parameters in harsh situations due to their high sensitivity, electromagnetic interference (EMI) immunity, and long-term stability. However, the current literature contains. According to the modulation form of the measured object, the light can be divided into: intensity modulation type, polarization type, phase type, and frequency type; According to whether light interferes, it can be divided into: interference type and non-interference type; According to whether the. Fiber-optic sensors typically include a light source, an incident fiber, an outgoing fiber, an optical modulator, a photodetector, and a demodulator. During operation, the light source enters the optical modulation region through the incident fiber. An optical fiber (or a special optical fiber) having sensitivity and detection capability to external. REVIEW www. Salih, Monserrat Gutiérrez Muñoz, Fahad Alam, Bader AlQattan, Dennyson Savariraj Antonysamy, Mohamed Fawzi Zaki, Ali K. Yetisen, Seongjun Park, Timothy D.