科教导刊
科教導刊
과교도간
THE GUIDE OF SCIENCE & EDUCATION
2012年
21期
114-116
,共3页
长周期光纤光栅(LPG)%轴向应力%谐振波长%光栅周期
長週期光纖光柵(LPG)%軸嚮應力%諧振波長%光柵週期
장주기광섬광책(LPG)%축향응력%해진파장%광책주기
Long period Fiber Grating(LPG)%axial stress%resonant wavelength%grating period
应用耦合模理论和弹性力学知识对长周期光纤光栅的轴向应力特性做了详细的理论分析和数值模拟。模拟结果表明。长周期光纤光栅的应变系数存在一拐点。当耦合的模式次数小于拐点对应的模式次数时，耦合的谐振波长随应力的增加向长波长处漂移（正漂移），且越靠近拐点，漂移越大；当耦合的模式次数大于拐点对应的模式次数时，耦合的谐振波长随应力的增加向短波长方向漂移，与正漂移相同，越靠近拐点，漂移越多。时于同一模式的耦合。长周期光纤光栅耦合的谐振波长的漂移和轴向应力的变化具有较好的线性关系。
應用耦閤模理論和彈性力學知識對長週期光纖光柵的軸嚮應力特性做瞭詳細的理論分析和數值模擬。模擬結果錶明。長週期光纖光柵的應變繫數存在一枴點。噹耦閤的模式次數小于枴點對應的模式次數時，耦閤的諧振波長隨應力的增加嚮長波長處漂移（正漂移），且越靠近枴點，漂移越大；噹耦閤的模式次數大于枴點對應的模式次數時，耦閤的諧振波長隨應力的增加嚮短波長方嚮漂移，與正漂移相同，越靠近枴點，漂移越多。時于同一模式的耦閤。長週期光纖光柵耦閤的諧振波長的漂移和軸嚮應力的變化具有較好的線性關繫。
응용우합모이론화탄성역학지식대장주기광섬광책적축향응력특성주료상세적이론분석화수치모의。모의결과표명。장주기광섬광책적응변계수존재일괴점。당우합적모식차수소우괴점대응적모식차수시，우합적해진파장수응력적증가향장파장처표이（정표이），차월고근괴점，표이월대；당우합적모식차수대우괴점대응적모식차수시，우합적해진파장수응력적증가향단파장방향표이，여정표이상동，월고근괴점，표이월다。시우동일모식적우합。장주기광섬광책우합적해진파장적표이화축향응력적변화구유교호적선성관계。
In this paper, the characteristics of strain of long period fiber gratings is analyzed in detail with coupled-mode theory and the knowledge of elasticity, and the numerical simulation is given. The results show that there is a turning point in strain coefficient of Long period Fiber Grating （LPG）.When the coupled mode orders are fewer than the mode orders in correspondence with turning point, the resonant wavelength shifts to the long wavelength,and closer to the turning point, the shift is greater. When the coupled mode orders are more than the modes corresponding with the turning point, the resonant wavelength shifts to the short wavelength with the increase oftbe axial strain. The results also show that resonant wavelength shift and axial strain changes has a good linear relationship.
