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An in-fiber structure for power-referenced refractometry based on a hybrid fiber grating is proposed and demonstrated experimentally. The hybrid fiber grating is formed by superimposing a short fiber Bragg grating (FBG) on the rear part of a much longer tilted-FBG (TFBG) so that it can work in the reflection mode. The reflected optical power from the hybrid fiber grating can be changed with the variation...
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