Patent ID: 8306370
Filing Date: 2012-11-06
Classification: G02F

Abstract:
1. A Mach Zehnder (MZ) modulator comprising a splitter for splitting incident light in one wave guide into two modulator arms of the MZ and comprising a combiner that combines light from the two arms into an output mode, where electrodes are present in connection with said arms for changing the refractive index in said arms in order to modulate incident light so that the light is amplified or so that an extinction, due to interference between the light in the two arms, takes place, characterised in that the splitter is arranged to split incident light equally into the two arms and in that one of the modulator arms comprises means for attenuating the incident light positioned between said electrode and said combiner to create an asymmetry in transmission of the incident light between the two modulator arms such that light combined in the combiner forms an output light comprising an unequal amount of light from each of the modulator arms due to the means for attenuating the incident light.