Patent ID: 8441249
Filing Date: 2013-05-14
Classification: G01R

Abstract:
1. A voltage measurement device comprising: a holder for arrangement between two potentials; a first waveguide transversally poled in a first poling direction; a second waveguide transversally poled in a second poling direction, wherein said first and second waveguides are of identical type and are arranged parallel to one other for each carrying at least one optical mode having two orthogonal light polarization directions, and wherein said first and second waveguides are supported on said holder with said first and said second poling directions being anti-parallel; a coupling between said first and said second waveguides for exchanging said orthogonal light polarization directions of the optical modes in the first and in the second waveguides such that a photon running along one of the first and second waveguides and being polarized along a slow axis of the one waveguide is coupled to a photon being polarized along a fast axis of the other of the first and second waveguides and vice versa; a control unit for sending light at least once through said first waveguide, said coupling and said second waveguide for measuring a phase delay between: