Optical and fiber optic chemical sensors have been reported extensively in literature on last two decades. Fiber optic sensors have since then found applications in chemical, biochemical, bio medical and environmental sensing. In general, Fiber optic sensors are classified as intrinsic and extrinsic type sensors. In the extrinsic type of sensors the optical fiber is only used as a means of light transport to an external sensing system. The intrinsic fiber optic sensors differ from extrinsic sensors, where light does not have to leave the optical fiber to perform the sensing function. In the...