All-fiber quasi-distributed polarimetric temperature sensor

Polarimetric DBR fiber laser sensor for strain-temperature discrimination

A polarimetric Distributed Bragg Reflector (DBR) laser sensor in a low birefringent Er-doped fiber has been proposed. The spectral overlap of two uniform fiber Bragg gratings (FBG) has been employed as filtering technique to achieve a Single Longitudinal Mode (SLM) regime. By measuring the RF beat frequency between the two orthogonal polarized lasing modes and the absolute wavelength of one mod...

Reflectometry Based Quasi - distributed High Temperature Sensor

Extended-range fiber polarimetric strain sensor.

We describe a frequency-modulation technique that is applicable to two-beam interferometric systems illuminated by semiconductor diode lasers. The technique permits a determination of the optical path difference between the two arms of the interferometer and is used here to extend the range of a fiber polarimetric strain sensor by determining the order of the particular polarimetric fringe unde...

A Novel All-Fiber Configuration for a Flexible Polarimetric Current Sensor

This set-up is particularly simple and makes possible the use of a flexible cable that may be plugged to the instrument using connectors for easy field applications. Measurements of AC and DC currents are demonstrated.

Polarization-maintaining photonic-crystal-fiber-based all-optical polarimetric torsion sensor

An application of a polarization-maintaining photonic crystal fiber (PM-PCF) for torsion sensing is proposed and experimentally demonstrated. The response of the sensor is theoretically validated using the Jones matrix. High normalized sensitivity of ∼0:014=° was measured within a linear twist angle range from 30° to 70°. The sensor response was observed to be highly repeatable over a 90° twist...