Interband optical pulse injection locking of quantum dot mode-locked semiconductor laser

We experimentally demonstrate optical clock recovery from quantum dot mode-locked semiconductor lasers by interband optical pulse injection locking. The passively mode-locked slave laser oscillating on the ground state is locked through the injection of optical pulses generated via the first excited state transition from the hybridly mode-locked master laser. When an optical pulse train generated via the first excited state from the master laser is injected to the slave laser oscillating via ground state, the slave laser shows an asymmetric locking bandwidth around the nominal repetition rate of the slave laser.