These sensors use light signals to detect physical parameters such as temperature, pressure, strain, and vibration. The performance of fiber optic sensors can be evaluated based on several key factors including sensitivity, accuracy, resolution, linearity, hysteresis . In addition, optical fiber sensors can be used to form an Optical Fiber Sensing Network (OFSN) allowing manufacturers to create versatile monitoring solutions with several applications, e., periodic monitoring along extensive distances (kilometers), in extreme or hazardous environments, inside. Fiber optics is one solution for it. To obtain information related to system evaluation, system testing is carried out by observing the performance of data. This article explores the different types of Fiber Optic Sensors, their working principles, and various applications. A sensor is a device that measures a physical quantity and converts it into a. In this paper the hybrid wireless and fiber optic sensor system based on a fiber Bragg grating (FBG), ZigBee IEEE 802. 4 and Radio over Fiber (RoF) has been presented. The sensor monitoring system generally consists of FBG-based temperature sensor integrating with ZigBee End Point, RoF modules. Wireless sensor networks (WSNs) are widely used to monitor remote areas far away from the monitoring center. For large-scale or high-capacity WSNs, when they contain many sensor nodes, a transmission system with low latency and large bandwidth is required.