| abstract |
The present invention provides a light source ( 2 ) for light circuits on a silicon platform ( 3 ). A vertical laser cavity is formed by a gain region ( 101 ) arranged between a top mirror ( 4 ) and a bottom grating-mirror ( 12 ) in a grating region ( 11 ) in a silicon layer ( 10 ) on a substrate. A waveguide ( 18, 19 ) for receiving light from the grating region ( 11 ) is formed within or to be connected to the grating region, and functions as an 5 output coupler for the VCL. Thereby, vertical lasing modes ( 16 ) are coupled to lateral in-plane modes ( 17, 20 ) of the in-plane waveguide formed in the silicon layer, and light can be provided to e.g. photonic circuits on a SOI or CMOS substrate in the silicon. |