Ultrashort pulse, high-power mode locking is demonstrated in InGaAs quantum dot lasers using a flared waveguide laser incorporating a narrow waveguide sections acting as both a mode filter and saturable absorber. 24GHz mode locking with 780fs pulses and 500mW peak powers are demonstrated at an emissions wavelength of 1.3μm.
A detailed study of harmonic mode-locking in a quantum-dot laser diode is presented. Mode-locking of the 1 st , 2 nd , 3 rd and 6 th harmonics are demonstrated, corresponding to repetition rates ranging from 39GHz to 238GHz.
IntroductionHarmonic mode-locking is an effective technique used for the generation of high repetition rate optical pulses, as it allows for an increase in repetition rate without the penalty of increased loss for shorter cavity lengths. The high frequency pulse trains generated by these lasers have the potential to be used in high speed communications systems, ultra-fast signal processing, and millimetre wave communication. Harmonic mode-locking has been studied in detail for quantum well mode-locked laser diodes [1], and repetition rates as high as 860GHz have been demonstrated using asymmetric colliding pulse mode-locking techniques [2]. However, there has been little work on harmonic mode-locking in quantum-dot laser diodes, with only 20GHz colliding pulse mode-locking being reported to date [3]. In this paper a detailed study of harmonic mode-locking in a quantum-dot laser diode is presented. Using an innovative multi-contact design we are able to characterise the mode-locking performance of many different harmonics using a single device, highlighting the potential of quantum-dot lasers for high repetition rate pulse sources.
For the first time hybrid and passive mode-locking jitter performance is investigated in 40GHz quantumdot mode-locked lasers. Record low passive mode-locking jitter of 219fs is presented, along with promising hybrid mode-locking results of 124fs.Introduction 30 Monolithic mode-locked laser diodes are attractive 25 HR pulse sources due to their high repetition rates and
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