Mode-locking of long cavity Fabry-Perot semiconductor laser at millimetre wave frequencies by subharmonic optical injection

摘要

A long cavity Fabry-Perot laser has been forced into pulsed operation with a repetition rate equal to its cavity resonant frequency (32.8GHz), by injecting short optical pulses at the fourth subharmonic (8.2 GHz). Pulse trains generated using this technique exhibit a high subharmonic suppression ratio (<17 dB), wide locking range (<500 MHz) and low levels of jitter (>0.4 ps).