We describe the lasing characteristics of a compact tunable laser source formed by the butt-coupling of a reflective indium phosphide optical amplifier to an SU8 waveguide coupled to few-mode photonic crystal reflector. The short cavity length ensured that only a single longitudinal mode of the device could overlap with each photonic crystal reflection peak.
We describe the technique allowing for generation of low-noise wider frequency combs and pulses of shorter duration in quantum-dot mode-locked lasers. We compare experimentally noise stabilization techniques in semiconductor mode-locked lasers. We discuss the benefits of electrical modulation of the laser absorber voltage (hybrid mode-locking), combination of hybrid mode-locking with optical injection seeding from the narrow linewidth continues wave master source and optical injection seeding of two coherent sidebands separated by the laser repetition rate.
We report experimental study of vector solitons for the fundamental and harmonic mode-locked operation in erbiumdoper
fiber lasers with carbon nanotubes based saturable absorbers and anomalous dispersion cavities. We measure
evolution of the output pulses polarization and demonstrate vector solitons with various polarization attractors, including
locked polarization, periodic polarization switching, and polarization precession.
Quantum-dot mode-locked lasers are injection-locked by coherent two-tone master sources. With optical injection
the slave laser optical spectrum becomes narrowed and tunable via the master wavelength. Frequency-resolved
Mach-Zehnder gating measurements performed to characterize slave laser pulses showed significantly improved
pulse time-bandwidth product (TBP) with optical injection. Measurements of the modal optical linewidths of
the injected laser demonstrated phase locking of all the slave laser modes to the master laser, which improved
significantly the device timing jitter. Integrated over a 20 kHz-80 MHz range timing jitter values of 210 fs were
achieved for small injection powers, close to the best reported results for the hybrid mode-locking of similar
QD-MLLs.
We study quantum dot mode locked lasers (QD MLL) under optical injection. For the experimental study we
use slave lasers two-section monolithic InAs/GaAs QD devices with a repetition rate of about 9.4 GHz, emitting
at 1.3 μm. A frequency resolved Mach-Zehnder gating (FRMZG) technique was utilised for the experimental
study of the pulse intensity, phase and chirp. For numerical simulations we use a modified delay-differential
model. We show experimentally improvement of the laser performance under injection and provide numerical
locking ranges obtained with DDEBIFTOOL package.
Modal optical linewidths of a passively mode-locked and optical injection locked quantum dot laser are studied.
For the free-running case the modal linewidth is in the order of tens of MHz and demonstrates a parabolic dependence
on the mode optical frequency. The slope of the parabola, as was predicted theoretically, is proportional
to the radio-frequency (RF) linewidth, which provides a direct measurement of the timing jitter. With optical
injection the slave laser optical spectrum becomes narrowed and tunable via the master wavelength. Frequency
resolved Mach-Zehnder gating measurements performed to characterize slave laser pulses showed significantly
improved pulse time-bandwidth product with optical injection. Measurements of the modal optical linewidths
of the injected laser have shown phase locking of the slave laser modes to the master laser in the vicinity of the
injection wavelength. However, far from this wavelength modal linewidth of the slave laser increases to greater
than that of the free running case, leading to increase of the RF linewidth and timing jitter with single-tone
injection.
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