Semiconductor lasers device

摘要

The device has a stack (11) of layers, arranged on a semiconductor substrate (10), in which the composition and thickness are chosen to form a distributed feedback (DFB) laser. A stack (12) of layers has thickness slightly different than that of the stack (11). The layer stack (12) is adjoining to the layer stack (11), and is arranged to form another distributed feedback (DFB) laser.