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Passively mode-locked semiconductor lasers have evolved as versatile photonic sources delivering ultra-short optical pulses with multi-gigahertz pulse repetition rates. In particular time-critical applications involving such compact and ultrafast photonic sources demand a precise knowledge of the pulse train timing and potential amplitude instabilities as well as pulse repetition control. The particular...
Mode-locked integrated mid-IR waveguide chip lasers with ultra-short pulse duration and high peak power are of great interest for a large range of applications like trace-gas spectroscopy and early-cancer detection. As those lasers are automatically embedded within a small block of doped glass, they are inherently robust and immune to environmental fluctuations. In this paper we investigate the suitability...
Generic photonic integration technology platforms allow for design and fabrication of large complexity application specific photonic integrated circuits. Monolithic active-passive integration on indium phosphide substrate naturally enables a reliable co-integration of optical gain elements and therefore on-chip realization of advanced laser systems. An overview of multi-wavelength sources in the form...
We study experimentally the pulsed emission of a passively mode-locked multi-section quantum-well semiconductor laser emitting picosecond short optical pulses at a fundamental repetition rate of 20 GHz and at a wavelength of 1070 nm. We identify different regions of picosecond short pulses dependent on the laser biasing conditions and relate them to the investigated mode-locking stability by means...
Potential photonic imaging and time-critical applications based on passively mode-locked semiconductor lasers require a precise knowledge of instabilities of these ultra-short pulse sources. These instabilities mainly manifest in a decreased timing jitter and amplitude jitter of the generated optical pulse train. Their origins are a net gain window outside the optical pulse or an imbalance of gain...
In this paper, we present two approaches for the Millimeter-waves (mmW) generation fabricated using active/passive photonic integration technology. The first approach uses the optical heterodyne technique, an 4-channel AWG based laser is built in order to generate a 113 GHz signal. The second approach uses pulsed sources, an on-chip-multiple colliding pulse mode locked laser generating optical modes...
Optical feedback stabilization is a powerful concept to improve the timing stability of passively mode-locked lasers. We first study experimentally the repetition rate and timing jitter behavior of a single-cavity optical feedback as a function of the microscopic delay length. By a dual-cavity optical feedback configuration, we then present experimental and numerical results on the repetition rate...
Based on the dissipative soliton resonance occurring in highly anomalous dispersion regime, we have demonstrated the emission of highly energetic square-wave pulses from the Er:Yb doped double clad fiber laser passively mode-locked through nonlinear polarization evolution. In contrast with the classical soliton regime, when the pumping power increases the pulse broadens and its energy increases, both...
For an Erbium-doped mode locked fibre laser, we demonstrate experimentally a new type of vector rogue waves (RWs) emergence of which is caused by the coherent coupling of the orthogonal states of polarisation (SOPs). Unlike weak interaction between neighbouring dissipative solitons for the soliton rain, this creates a new type of the energy landscape where the interaction of the orthogonal SOPs leads...
A fiber mode-lock laser allows generation of the optical rogue wave (ORW) at different time scales. The criteria for distinguishing between them is a comparison of the event lifetime with the main characteristic time of the system. The characteristic time can be estimated from the decay of an autocorrelation function (AF). Thus, in comparison with AF characteristic time, fast optical rogue wave (FORW)...
We review our recent progress on the realisation of pulse shaping in passively-mode-locked fibre lasers by inclusion of an amplitude and/or phase spectral filter into the laser cavity. We numerically show that depending on the amplitude transfer function of the in-cavity filter, various advanced temporal waveforms can be generated, including parabolic, flattop and triangular pulses. An application...
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