A Dual-Parameter Sensor Using a Long-Period Grating Concatenated With Polarization Maintaining Fiber in Sagnac Loop

PROJECT TITLE :

A Dual-Parameter Sensor Using a Long-Period Grating Concatenated With Polarization Maintaining Fiber in Sagnac Loop

ABSTRACT:

During this paper , a unique twin-parameter measurement theme employing a long-period grating (LPG) concatenated with polarization maintaining fiber (PMF) during a Sagnac loop was proposed and experimentally demonstrated to live temperature and refractive index (RI) simultaneously. There are 2 varieties of dips within the output spectrum of the proposed sensor, that are shaped by the LPG and Sagnac loop. Compared with the ancient Sagnac loop sensors using PMF only, the birefringence induced by the LPG changes the section distinction and makes the dips of the Sagnac loop sensitive to surrounding RI. Because of totally different interference mechanisms, the twin-parameter measurement is realized by Sagnac loop and LPG with totally different sensitivities to temperature and RI. Experiments show that in the output spectrum of the sensor, the dip of the LPG has the sensitivities of 0.201 nm/°C and −8.36 nm/RIU, and the dip of the Sagnac loop has the sensitivities of −1.06 nm/°C and −23.068 nm/RIU. The proposed sensor contains a straightforward structure and nice potential in biological, chemical, and ocean fields.

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