光纖光柵依其結構及工作原理的差異，可分為穿透式長週期光纖光柵及反射式布拉格光纖光柵兩種。近年來所發展出的長週期光纖光柵經發現在感測應用上，其溫度、應力的感測靈敏度均比布式光纖光柵高，使其應用價值具有相當的潛力。本實驗採用功率較低、波長較長之連續式氦鎘雷射為曝曬光源，以取代一般研究報告常用之高功率準分子雷射，並配合電腦自動控制精密移動平臺，以逐點燒寫的方法製作長週期光纖光柵。同時完成了自製長週期光纖光柵之特性探討，其中包括不同曝曬時間、不同光柵週期及不同光柵長度的光纖光柵製作，及其穿透頻譜的量測，其結果均與理論相符合。

　　　　　Fiber grating, as an electro-optic component, has been used as a sensor in communications, Internet and various optical applications. The long-period fiber grating has been proved to be a useful optical component for source stabilization, strain gauges, and selective filters. This research develops an enhanced production method and studies the characteristics of long-period fiber gratings. A low power, dual band 325/442 nm, continuous wave He-Cd laser, substituting the conventional high power excimer laser with 248 nm, is employed as a light-source. Fiber gratings were fabricated