A novel Erbium-doped fiber laser sensor based on a sigma-type cavity configuration using a double-pass cascadedchirped long-period fiber grating (C-CLPG) as a reflective sensor section is proposed for a real-time displacement sensor, in which the double-pass C-CLPG is provided by returning the transmitted light of the C-CLPG with a Faraday rotator mirror (FRM) in the σ-branch of the cavity. The σ-branch with FRM-reflection realizes a compensation effect for the polarization fluctuations in the sensor section, a stable oscillation output during the sensing operation, and a suitable arrangement for remote sensing. In the experiment, we have successfully demonstrated a real-time displacement measurement based on bending characteristics of the C-CLPG, taking advantage of laser-type sensors.
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