Abstract
We propose a high sensitivity sensor based on a mode number-encoded multi-longitudinal
mode fiber laser. The fiber laser incorporates a uniform fiber Bragg grating (FBG) and a fiber
Fabry-Perot interferometer (FFPI) as sensitive components in the cavity. The sensor counts the
number of longitudinal modes (NLM) of fiber laser, which is caused by the mismatch between the
reflection band of FBG and the transmission band of FFPI resulting from the application of external
perturbation to the FBG. An electrical spectrum analyzer is adopted to analyze the NLM. The strain
sensor is experimentally demonstrated to have sensitivity of as high as 0.02 με/mode.
© 2013 Chinese Optics Letters
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