Fiber-optic devices and sensors are implemented using fiber gratings. The fiber-optic device includes the fiber grating, an input mode stripper and an output mode stripper placed at both ends of the fiber grating, to admit only one mode therethrough, and a polarizer. The fiber grating of this invention...http://www.google.ca/patents/US5444803?utm_source=gb-gplus-sharePatent US5444803 - Fiber-optic devices and sensors using fiber grating
