https://dds.las.ac.cn/service/document?appId=a1vacbnPuv9qJRzJvdNXfsesj9JbIa6e&appKey=sPBA4vANLzjnW1k5eufEcc4k7dxfNraW&ts=1763013102786&signature=64a398c77235bad6a6a5acd0327d38ea&articleTitle=Fiber+Bragg+Gratings&articleAuthor=Raman+Kashyap&publicationTitle=Fiber+Bragg+Gratings&language=&publicationType=1&publishYear=2009&isn=9780123725790&publisher=