| 摘要 |
The present invention relates to a modulator (3) comprised of semiconductor material and intended for modulating a light signal. The modulator includes at least one first cover layer (5) made of semiconductor material and having a first refractive index, a waveguide disposed on said first cover layer and comprised of semiconductor material that has a second refractive index, a second cover layer (10) disposed on said waveguide (12) and comprised of semiconductor material that has a third refractive index. The first and the third refractive indexes in said first and said second cover layers (5, 10) are lower than the second refractive index in said waveguide (12). The first and the second cover layers (5, 10) are connected to a first and a second metal layer (17, 13), where the first metal layer (17) is connected directly or indirectly to the first cover layer (5) and forms a first electric contact surface, and where the second metal layer (13) is connected directly or indirectly to the second cover layer (10) and forms a second electric contact surface. The waveguide (12) is curved or angled such that a tangent (50) to the waveguide (12) at one end surface of the waveguide (12) will meet an end surface of the modulator at an angle ( alpha ) other than 90 DEG , such as to reduce reflection of light back through the modulator (3). |
