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Optical temperature sensors are temperature sensors that are based on optical technology – in most cases, on fiber optics. There are alternative techniques, in particular electronic temperature sensing. However, optical temperature sensors can offer important advantages such as:  High-voltage isolation Electromagnetic  and radiation immune Inherently intrinsically safe/ Intrinsically non-explosive Insensitive to lightning strikes Cryogenic and high temperature tolerant Simple, safe handling of the optical cable High resistance to dynamic fatigue Subsequent repair and mounting Perfect load transfer No corrosion or drift Installation of numerous sensors on the same line Fiber Optics Temperature Measurement System: Figure 1: Components of a typical optical temperature measurement system The general structure of an optical fiber temperature measurement system is shown in the above figure 1 which consists mainly of four components that are  the source,  fiber optic,  modulator (or transdu