Abstract
We present an investigation of passive and hybrid mode-locking in Fabry-Pérot type two-section InAs/InP(100) quantum dot lasers that show dual wavelength operation. Over the whole current and voltage range for mode-locking of these lasers, the optical output spectra show two distinct lobes. The two lobes provide a coherent bandwidth and are verified to lead to two synchronized optical pulses. The generated optical pulses are elongated in time due to a chirp which shows opposite signs over the two spectral lobes. Self-induced mode-locking in the single-section laser shows that the dual-wavelength spectra correspond to emission from ground state. In the hybrid mode-locking regime, a map of locking range is presented by measuring the values of timing jitter for several values of power and frequency of the external electrical modulating signal. An overview of the systematic behavior of InAs/InP(100) quantum dot mode-locked lasers is presented as conclusion.
Highlights
More than 15 years of research on semiconductor quantum dots (QDs) has revealed distinctive properties of such material for incorporation as active medium in semiconductor optical amplifiers (SOAs) and lasers
The output of the hybridly mode-locked device is passed through a band-pass filter (BPF) which is tuned over the spectrum and the oscilloscope traces are recorded
Wide coherent bandwidth which is desirable for generation of short optical pulses, together with the
Summary
More than 15 years of research on semiconductor quantum dots (QDs) has revealed distinctive properties of such material for incorporation as active medium in semiconductor optical amplifiers (SOAs) and lasers. At the COBRA Research Institute, optically active materials based on InAs QDs on n-type (100) InP substrate have been developed which provide peak gain in the wavelength range of 1.5μm to 1.8μm [3]. This brings the interesting properties of QDs to the wavelength region which is attractive for fiber optic communications and for novel applications such as integrated tunable lasers for gas sensing and optical coherence tomography [4]. We have previously reported on highly chirped ML operation in Fabry-Pérot (FP) type InAs/InP(100) QD lasers over a wide range of operating parameters Such devices generate elongated pulses with a relatively wide, i.e. 8nm, optical bandwidth [8, 9]. The ML behavior in our devices has similar properties as observed in single-section InAs/InP Q-dash ML lasers [11]
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