Wavelength switching transition in quantum dot lasers

Wang, Hsing-Yeh; Cheng, Hsu-Chieh; Lin, Sheng-Di; Lee, Chien-Ping

doi:10.1063/1.2709987

Cited by 18 publications

(7 citation statements)

References 11 publications

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“…7 QD-based devices typically operate on the QD GS, 3-6 though ES operation and simultaneous or switchable dualstate operation has attracted considerable attention. [8][9][10][11][12][13][14][15][16] While the ultrafast carrier dynamics of the GS single-state operating devices have been studied in a large number of works, [17][18][19][20][21][22][23][24][25][26][27] to date no experiments on the interdependency of the ultrafast gain dynamics in dual-state or ES laser devices have been conducted. Especially interesting is the influence of different steady-state conditions and carrier lifetimes in the ES on the carrier relaxation into the GS.…”

mentioning

confidence: 99%

Gain dynamics of quantum dot devices for dual-state operation

Kaptan

Schmeckebier

Herzog

et al. 2014

Applied Physics Letters

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Ground state gain dynamics of In(Ga)As-quantum dot excited state lasers are investigated via single-color ultrafast pump-probe spectroscopy below and above lasing threshold. Two-color pump-probe experiments are used to localize lasing and non-lasing quantum dots within the inhomogeneously broadened ground state. Single-color results yield similar gain recovery rates of the ground state for lasing and non-lasing quantum dots decreasing from 6 ps to 2 ps with increasing injection current. We find that ground state gain dynamics are influenced solely by the injection current and unaffected by laser operation of the excited state. This independence is promising for dual-state operation schemes in quantum dot based optoelectronic devices. V C 2014 AIP Publishing LLC. [http://dx.

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mentioning

confidence: 99%

Gain dynamics of quantum dot devices for dual-state operation

Kaptan

Schmeckebier

Herzog

et al. 2014

Applied Physics Letters

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“…two distinct wavelength regions, the ground-state and the excited-state [22]. A certain level in control of their emission states can be obtained by tuning the temperature or asymmetrical biasing [23], [24], [25], however, these solutions are either relatively slow or require additional external biasing. Another drawback of Quantum-Dot lasers is their replication, as their properties are highly dependent on the dot size, achieving a reliable manufacturing process is challenging.…”

Section: Introductionmentioning

confidence: 99%

Control of dual-wavelength laser emission via optical feedback phase tuning

Pawlus¹,

Breuer²,

Virte³

2022

Preprint

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We propose and demonstrate a technique to control the balance between the two amplitudes of a dual-wavelength laser based on a phase-controlled optical feedback. The feedback cavity length is adjusted to achieve a relative phase shift between the desired emission wavelengths, introducing a boost in gain for one wavelength while the other wavelength experiences additional losses. Tuning the optical feedback phase proves to be an effective way to control the gain & losses, and, thus, to select one or balance the amplitude of the two emission wavelengths. This concept can be easily adapted to any platform, wavelength range and wavelength separations providing that a sufficient carrier coupling and gain can be obtained for each mode. To demonstrate the feasibility and to evaluate the performance of this approach, we have implemented two dual-wavelength lasers with different spectral separations together with individual optical feedback loops onto a InP generic foundry platform emitting around 1550 nm. An electro-optical-phase-modulator is used to tune the feedback phase. With this single control parameter, we successfully achieved extinction ratios of up to 38.6 dB for a 10 nm wavelength separation and up to 49 dB for a 1 nm wavelength separation.

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“…Most experimental studies heretofore have been carried out on two section devices. Markus et al 12 used voltage applied to the absorber section as a controlling parameter of switching, while Wang et al 13 obtained state switching by changing injection current applied to both positively biased gain sections.…”

Section: Introductionmentioning

confidence: 99%

All-optical switching with a dual state quantum dot laser

Tykalewicz

Goulding

Hegarty³

et al. 2014

SPIE Proceedings

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The behaviour of a dual state quantum dot laser undergoing optical injection is analysed. Depending on the injection current the free-running operation of the slave can be ground state only emission, both ground state and excited state emission or excited state emission only. Complete suppression of the excited state in the dual state lasing regime via sufficiently strong optical injection of the ground state is presented. Injection induced switching between two longitudinal modes of the ground state is also presented in the ground state only regime.

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Wavelength switching transition in quantum dot lasers

Cited by 18 publications

References 11 publications

Gain dynamics of quantum dot devices for dual-state operation

Gain dynamics of quantum dot devices for dual-state operation

Control of dual-wavelength laser emission via optical feedback phase tuning

All-optical switching with a dual state quantum dot laser

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