Long Period Grating based Optical Fiber Sensors: Fabrication Techniques and Characteristics

Advantages of long-period grating (LPG) based optical fibers for sensing applications along with different fabrication techniques to draw grating on the core of fiber have been reviewed. Some advantages and disadvantages of the fabrication techniques has been remarked. The condition for efficient mode coupling and corresponding theoretical model is presented. A comparison between LPG based fiber optic sensor and other fiber optic sensors have also been mentioned.