Depending on the application, fiber may be used because of its small size, or because no electrical power is needed at the remote location, or because many sensors can be multiplexed along the length of a fiber by using light wavelength shift for each sensor, or by. Depending on the application, fiber may be used because of its small size, or because no electrical power is needed at the remote location, or because many sensors can be multiplexed along the length of a fiber by using light wavelength shift for each sensor, or by. Fiber optic sensors—also known as optical fiber sensors—use optical fibers either as the sensing element or as a medium to transmit sensing signals. These sensors are capable of measuring a wide range of physical and chemical parameters such as temperature, pressure, vibration, displacement. A fiber optic sensor measures a physical quantity by modulating the intensity, spectrum, phase, or polarization of light traveling through the optical fiber system. It's a device that converts light rays into electronic signals. This is a very interesting and also well-known topic in the research field. Fiber optic sensors play a key role in developing the communication system to sense & measure the change within. Fiber optic current sensors are revolutionizing the way electrical currents are measured, providing high sensitivity, immunity to electromagnetic interference (EMI), and the ability to function in harsh environments.