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In the letter we demonstrate experimentally the operation of a polarisation-independent amplitude modulator based on the evolution of the electro-optical modulation efficiency against the position of the mode with respect to the electrode system. For a 20 mm-long Mach-Zehnder interferometer command voltages of 5 V have been obtained at the polarisation-insensitive configuration.
A polariser on a Ti:LiNbO3 channel waveguide has been realised using a double fabrication process (Ti indiffusion and proton exchange). A region is created where the extraordinary polarisation experiences a leaky propagation leading to an extinction ratio of 30 dB and excess loss of about 1 dB.
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