| 摘要 |
An electro-optic device for controlling the phase shift between first and second waveguide paths (16A,16B) with pairs of doped regions (24, 25; 26, 27; 24, 28; 25, 29) of opposite polarity being provided on opposite sides of the respective waveguide paths (16A, 16B) for altering the refractive index of the waveguide paths by altering the density of charge carriers within the waveguide paths when a voltage is applied. Each waveguide path (16A, 16B) is provided with two pairs of doped regions, the polarity of the first pair (24, 26; 24, 28) being opposite to the polarity of the second pair (25, 27; 25, 29) and the first and second pairs being electrically connected in series. Each of the doped areas (24, 25, 26, 27, 28, 29) is subject to substantially the same misalignment with the respective waveguide path (16A, 16B), whereby a path imbalance induced between the first and second waveguide paths (16A,16B) due to the first pair of doped regions (24, 26; 24, 28) of each path is counteracted by a path imbalance in the opposite direction due to the second pair (25, 27; 25, 29) of doped regions of each path. |
