A linearized electro-optic modulator (250, 1002) comprising: a) a substrate comprising a first Mach Zehnder interferometer comprising a first and second optical waveguide and a second Mach Zehnder interferometer comprising a first and a second optical waveguide; b) a signal electrode positioned on the substrate between the first and second Mach Zehnder interferometers (254, 252) to receive a modulation signal; and c) first and second ground electrodes (260, 258) positioned on the substrate that are electrically connected to ground potential, wherein the signal electrode and the first and second ground electrodes (260, 258) are positioned so that an electric field generated by the signal electrode modulates both the first and second Mach Zehnder interferometers (254, 252) to generate a first and a second modulated optical signal; characterised in that the first ground electrode is positioned on the substrate between the first and second optical waveguides of the first Mach Zehnder interferometer and the second ground electrode is positioned on the substrate between the first and second optical waveguides of the second Mach Zehnder interferometer; and in that the signal electrode is positioned closer to the second ground electrode than to the first ground electrode. a) a substrate comprising a first Mach Zehnder interferometer comprising a first and second optical waveguide and a second Mach Zehnder interferometer comprising a first and a second optical waveguide; b) a signal electrode positioned on the substrate between the first and second Mach Zehnder interferometers (254, 252) to receive a modulation signal; and c) first and second ground electrodes (260, 258) positioned on the substrate that are electrically connected to ground potential, wherein the signal electrode and the first and second ground electrodes (260, 258) are positioned so that an electric field generated by the signal electrode modulates both the first and second Mach Zehnder interferometers (254, 252) to generate a first and a second modulated optical signal; characterised in that the first ground electrode is positioned on the substrate between the first and second optical waveguides of the first Mach Zehnder interferometer and the second ground electrode is positioned on the substrate between the first and second optical waveguides of the second Mach Zehnder interferometer; and in that the signal electrode is positioned closer to the second ground electrode than to the first ground electrode. wherein the signal electrode and the first and second ground electrodes (260, 258) are positioned so that an electric field generated by the signal electrode modulates both the first and second Mach Zehnder interferometers (254, 252) to generate a first and a second modulated optical signal; characterised in that the first ground electrode is positioned on the substrate between the first and second optical waveguides of the first Mach Zehnder interferometer and the second ground electrode is positioned on the substrate between the first and second optical waveguides of the second Mach Zehnder interferometer; and in that the signal electrode is positioned closer to the second ground electrode than to the first ground electrode.