Abstract
The paper deals with the response of polarization maintaining (PM) fibers upon the variation of the temperature field, on condition both polarization axes are excited. Proper use can be applied in the area of optical fiber thermal field disturbance sensor. For a description of polarization properties the coherent Jones and Muller matrices were used. The Poincare sphere was applied to depict the development of the output of the polarization state of PM fibers for wavelengths 633 nm, 1310 nm and 1550 nm were arranged in a proposed sensor setup and were studied in the laboratory. A wide file of results containing dependencies of phase shift variations upon different configurations of measured PM fiber was obtained. The thermal field disturbance of the PM fiber was applied by an object with defined proportions and a defined range of temperatures. Dependencies of phase shift upon the object´s temperature, its distance from the fiber and exposed length of PM fiber were measured.
Highlights
From the beginning of fiber realization in the telecommunications area it got to the big development of the theory and practical applications
The Poincare sphere was applied to depict the development of the output of the polarization state of polarization maintaining (PM) fibers for wavelengths 633 nm, 1310 nm and 1550 nm were arranged in a proposed sensor setup and were studied in the laboratory
Disturbance of the thermal PM fiber field was done using a plastic basin with a constant amount of water heated to the desired temperature
Summary
From the beginning of fiber realization in the telecommunications area it got to the big development of the theory and practical applications. Almost in the same time there were ideas on the application of fibers in sensors. Isotropic fibers [1], polarization maintaining fibers (PMF) and rare earth doped fibers [2] have been used in the number of sensor applications. One example of an application is the interferometric sensor of gyroscope [3], [4]. Polarization maintaining fibers were established for exciting of optical radiation to one polarization axis only and maintenance polarization state along the whole length of the fiber. According to the induced birefringence, fibers were applied in sensors, e.g. for measurement of mechanical pressure [5]
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