Patent ID: 8682113
Filing Date: 2014-03-25
Classification: B82Y,G02F

Abstract:
1. An electro-optic waveguide polarisation modulator comprising: first and second spaced apart cladding layers; a waveguide core between the first and second cladding layers, the waveguide core having a higher refractive index than the cladding layers; a plurality of primary electrodes arranged on the opposite side of the first cladding layer to the core; at least one secondary electrode arranged on the opposite side of the second cladding layer to the core; wherein the electrodes are arranged to provide an electric field having field components in two substantially perpendicular directions within the waveguide core so as to modulate the refractive index thereof such that electromagnetic radiation propagating through the core is converted from a first polarisation state to a second polarisation state; and at least one grading layer sandwiched between at least one of the first and second cladding layers and the core, the grading layer having an effective refractive index intermediate between that of the waveguide core and the cladding layer.