| 摘要 |
<p>A photonic integrated circuit 'PIC' device comprising two or more vertically stacked asymmetric waveguides is provided. A photo-detector PIC device comprises a first coupling waveguide (114) for providing a low-coupling loss with an external optical fiber and for guiding primarily a first mode of light, a second waveguide (116) vertically coupled to the first waveguide (114) for guiding primarily a second mode of light having an effective index of refraction different from the first mode, and a photo-detector (118) vertically coupled to the second waveguide (116). Light received at the coupling waveguide is moved into the second waveguide via a lateral taper (117) in the second waveguide. The photo-detector PIC may further comprise a third waveguide having an optical amplifier therein and positioned between the coupling waveguide and the second waveguide.</p> |
