Dual-wavelength mode-locked quantum-dot laser, via ground and excited state transitions: Experimental and theoretical investigation

University of Dundee, School of Engineering, Physics and Mathematics, Dundee DD1 4HN, UK.
Optics Express (Impact Factor: 3.49). 06/2010; 18(12):12832-8. DOI: 10.1364/OE.18.012832
Source: PubMed

ABSTRACT We report a dual-wavelength passive mode locking regime where picosecond pulses are generated from both ground (lambda = 1263 nm) and excited state transitions (lambda = 1180 nm), in a GaAs-based monolithic two-section quantum-dot laser. Moreover, these results are reproduced by numerical simulations which provide a better insight on the dual-wavelength mode-locked operation.

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Available from: Daniil Nikitichev, Jan 08, 2015
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    • "In this paper we consider the latter feature which appears to be of interest for a wide range of applications including THz generation [14], [15], two color mode-locking [16], [17] and all-optical processing, such as all-optical memory (as demonstrated with another type of twocolor laser diode [18], [19]). These two lasing state QD lasers might therefore provide a two-color source without the need of complex design or setup and with a large frequency splitting. "
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    ABSTRACT: We investigate theoretically the impact of optical feedback on quantum dot two-color laser dynamics when emitting from both the excited and the ground states. Detailed analysis of the laser dynamics is provided by numerical integrations and continuation techniques, as well as by analytical methods. As the feedback strength is increased the quantum dot laser undergoes a sequence of bifurcations involving steady-states, external cavity modes, self-pulsations and chaos. We furthermore report on two interesting mode competition results: 1/ the optical feedback favors the ground state emission; hence an increase of the feedback strength will generally lead to an increase of the ground state emission output power. 2/ The optical feedback can select one lasing state or induce bistable switchings between different steady-states depending on the feedback strength and the injection current.
    IEEE Journal of Quantum Electronics 07/2013; 49(3):578. DOI:10.1109/JQE.2013.2260725 · 1.89 Impact Factor
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    • "The average power was of the same order for GS-and ES-pulsed outputs, ranging between 20 and 30 mW. Furthermore , the same laser also displayed, for different bias conditions , several other regimes of operation, such as mode locking via the GS or via the ES, and continuous-wave (CW) emission via the GS [31], which clearly highlights the spectral versatility that QD structures can offer. An alternative method for achieving dual-wavelength modelocking involving the GS (λ = 1270 nm) and ES (λ = 1207 nm) has also been subsequently demonstrated by Breuer et al. [33], by using a 3-mm multisection laser where the active region incorporates six chirped QD layers. "
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    ABSTRACT: This paper presents the current status of our research in mode-locked quantum-dot edge-emitting laser diodes, particularly highlighting the recent progress in spectral and temporal versatility of both monolithic and external-cavity laser configurations. Spectral versatility is demonstrated through broadband tunability and novel mode-locking regimes that involve distinct spectral bands, such as dual-wavelength mode-locking, and robust high-power wavelength bistability. Broad tunability of the pulse repetition rate is also demonstrated for an external-cavity mode-locked quantum-dot laser, revealing a nearly constant pulse peak power at different pulse repetition rates. High-energy and low-noise pulse generations are demonstrated for low-pulse repetition rates. These recent advances confirm the potential of quantum-dot lasers as versatile, compact, and low-cost sources of ultrashort pulses.
    IEEE Journal of Selected Topics in Quantum Electronics 09/2011; 17(5):1302-1310. DOI:10.1109/JSTQE.2011.2141119 · 2.83 Impact Factor
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    ABSTRACT: We analyze theoretically nonlinear dynamics of an optically injected two-mode quantum dot laser lasing simultaneously from the ground and excited states. We show that although the external optical signal is injected into the ground-state mode alone, it can lead to the generation of regular picosecond pulses and pulse packages in the intensity of the excited-state mode. Generation of regular streams of picosecond pulses is attributed to an intrinsic gain switching mechanism where the relaxation time is modulated by the oscillations in the occupation of the ground and excited energy states.
    Journal of the Optical Society of America B 11/2010; 27(11). DOI:10.1364/JOSAB.27.002416 · 1.97 Impact Factor
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