Abstract
The polarization dependence of the linear electro-optic coefficient (LEO) in thermally poled twin-hole silica fiber has been characterized by two separate interferometric methods and the results compared. Firstly the magnitudes of the individual LEO values for the two separate polarization states of the thermally poled twin-hole silica fiber were measured and the difference in the LEO values was calculated by subtraction. Secondly a direct measurement of the difference was made using an interferometric technique by monitoring the total retardance of the birefringent poled twin hole fiber section while applying various electric fields to the internal electrodes. The second method, which directly measures the differential LEO, has strong potential as an interferometric method for the measurement of electric fields. The intended application is the measurement of line voltage in high voltage electricity distribution and transmission systems.
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