An electro-optic Mach-Zehnder modulator, comprising: - a first optical waveguide forming a first modulator arm and a second optical waveguide forming a second modulator arm; - an electrode arrangement comprising a plurality of first waveguide electrodes (21, 221) for applying a voltage across the first optical waveguide and a plurality of second waveguide electrodes (22, 222) for applying a voltage across the second optical waveguide; and at least one electrical line (223, 224), wherein - the electrode arrangement further comprises a first section having at least one of the first waveguide electrodes and at least one of the second waveguide electrodes and a second section having at least one of the first waveguide electrodes and at least one of the second waveguide electrode, wherein the first section is galvanically separated from the second section; - at least one electrically conductive connecting element (3a, 3b) generating a short-circuit between the at least one first waveguide electrode and at least one second waveguide electrode of the second section, wherein in the first section no short-circuit exists between the least one first waveguide electrode and the at least one second waveguide electrode, wherein - at least one high-frequency voltage source is connected to the at least one first waveguide electrode and the at least one second waveguide electrode of the second section via said at least one electrical line (223, 224), wherein the high-frequency voltage source is configured for supplying a high frequency signal having a wavelength that equals the length of the first and the second waveguide electrode (221, 222) or that is smaller than the length of the first and the second waveguide electrode (221, 222) such that the electric potential of the first waveguide electrode is different from the electric potential of the second waveguide electrode. - a first optical waveguide forming a first modulator arm and a second optical waveguide forming a second modulator arm; - an electrode arrangement comprising a plurality of first waveguide electrodes (21, 221) for applying a voltage across the first optical waveguide and a plurality of second waveguide electrodes (22, 222) for applying a voltage across the second optical waveguide; and at least one electrical line (223, 224), wherein - the electrode arrangement further comprises a first section having at least one of the first waveguide electrodes and at least one of the second waveguide electrodes and a second section having at least one of the first waveguide electrodes and at least one of the second waveguide electrode, wherein the first section is galvanically separated from the second section; - at least one electrically conductive connecting element (3a, 3b) generating a short-circuit between the at least one first waveguide electrode and at least one second waveguide electrode of the second section, wherein in the first section no short-circuit exists between the least one first waveguide electrode and the at least one second waveguide electrode, wherein - at least one high-frequency voltage source is connected to the at least one first waveguide electrode and the at least one second waveguide electrode of the second section via said at least one electrical line (223, 224), wherein the high-frequency voltage source is configured for supplying a high frequency signal having a wavelength that equals the length of the first and the second waveguide electrode (221, 222) or that is smaller than the length of the first and the second waveguide electrode (221, 222) such that the electric potential of the first waveguide electrode is different from the electric potential of the second waveguide electrode.