Ultra-high repetition rate InAs/InP quantum dot mode-locked lasers

We have designed, grown and fabricated InAs/InP quantum dot (QD) waveguides as the gain materials of mode-locked lasers (MLLs). Passive InAs/InP QD MLLs based on single-section Fabry–Perot (F–P) cavities with repetition rates from 10 GHz to 100 GHz have been demonstrated in the C- and L-band. Femtosecond (fs) pulses with pulse duration of 295 fs have been achieved. The average output power is up to 50 mW at the room temperature of 18 °C. By using the external fiber mixed cavities fs pulse train with a repetition rate of 437 GHz has been generated. We have also discussed the working principles of the developed QD MLLs.

Research Highlights
► Developed InAs/InP quantum dot (QD) gain materials for mode-locked lasers (MLLs).
► Demonstrated InAs/InP QD MLLs with repetition rate from 10 GHz to 100 GHz.
► Achieved fs pulses with pulse duration of 295 fs and output power of up to 50 mW.
► Generated 437-GHz pulse trains by using the external fiber mixed cavities.