Mach-zehnder modulator arrangement and method for operating a mach-zehnder modulator arrangement

A Mach-Zehnder modulator arrangement, comprising:

• at least one 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;
• a travelling wave electrode arrangement comprising a plurality of first waveguide electrodes for applying a voltage across the first optical waveguide and a plurality of second waveguide electrodes for applying a voltage across the second optical waveguide, wherein the first waveguide electrodes are capacitively coupled to the second waveguide electrodes;
• and
• a driver unit for supplying an alternating voltage to the travelling wave electrode arrangement, wherein
• the driver unit comprises a first output port coupled to the first waveguide electrodes and a second output port coupled to the second waveguide electrodes, wherein the driver unit is configured to supply a first varying signal to the first waveguide electrodes via the first output port and to supply a second varying signal to the second waveguide electrodes via the second output port, wherein the impedance of the driver unit at each one of the two output ports is essentially half of the impedance of the travelling wave electrode arrangement.