EXTREMELY LOW-AMPLITUDE MODULATION IN A SUBHARMONICALLY HYBRID MODE-LOCKED MONOLITHIC SEMICONDUCTOR-LASER

Negligibly small amplitude modulation and sufficiently low timing jitt er are achieved simultaneously in a passively mode-locked monolithic s emiconductor laser stabilized by applying an electrical signal at the second subharmonic of the pulse repetition frequency, Nearly transform -limited 33 GHz pulse trains with 0.56 ps timing jitter and -23 dBc am plitude modulation are obtained with 23 dBm driving signals at 16.5 GH z, Detailed investigations are carried out on the dependence of the am plitude modulation and timing jitter on RF driving power for the secon d- and third-order subharmonic cases, The excellent amplitude modulati on property of the second subharmonic case with the specific laser use d in this work is ascribed to the frequency response characteristics o f the device.