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Quantum Dot Lasers and Laser Dynamics
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Quantum Dot Lasers and Laser Dynamics

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (20 June 2022) | Viewed by 11749

Special Issue Editors

Dr. Jock Bovington

E-Mail Website
Guest Editor
Cisco Systems, San Diego, CA 93106, USA
Interests: lasers; photonic integrated circuits; optical integration and packaging; silicon photonics; optical communications
Prof. Dr. Mariangela Gioannini

E-Mail Website
Guest Editor
Department of Electronics and Telecommunications, Politecnico di Torino, 2410129 Torino, Italy

Special Issue Information

Dear Colleagues,

For years, we have been packaging semiconductor lasers with strong isolators to damp any dynamic effects from disrupting into chaos and producing anomalous behaviors. However, in the quest for ever-increasing density of optical interconnects and with new discoveries in optical computing and laser-based neural networks, deeper insights are required into how lasers behave in the presence of different forms of optical and electrical feedback. This Special Issue invites investigators to broaden our community’s understanding of recent theoretical and empirical discoveries related to laser dynamics in general, and/or quantum dot lasers in particular. Isolator-free operation, mode-locked and other comb lasers, optical phase locked loops, direct modulation in excess of the photon lifetime of the cavity, (self-)injection locking. and other dynamic behaviors are all interesting phenomena related to this special topic. If you have any measurements or simulations which can shed more light on these fascinating and useful research topics, we would like to review your contribution.

Dr. Jock Bovington
Prof. Mariangela Gioannini
Guest Editors

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Keywords

  • quantum dot lasers
  • feedback tolerant lasers
  • mode-locked lasers
  • non-linear laser dynamics
  • injection locking
  • optical phase locked loops
  • linewidth enhancement factor

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Published Papers (4 papers)

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Research

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9 pages, 965 KiB  
Article
High-Efficiency Quantum Dot Lasers as Comb Sources for DWDM Applications
by Mario Dumont, Songtao Liu, M. J. Kennedy and John Bowers
Appl. Sci. 2022, 12(4), 1836; https://doi.org/10.3390/app12041836 - 10 Feb 2022
Cited by 23 | Viewed by 3286
Abstract
The trend of data center transceivers is to increase bandwidth while simultaneously decreasing their size, power consumption, and cost. While data center links have previously relied on vertical-cavity surface-emitting lasers (VCSELs) or in-plane lasers using coarse wavelength division multiplexing (WDM) to encode data, [...] Read more.
The trend of data center transceivers is to increase bandwidth while simultaneously decreasing their size, power consumption, and cost. While data center links have previously relied on vertical-cavity surface-emitting lasers (VCSELs) or in-plane lasers using coarse wavelength division multiplexing (WDM) to encode data, recently, dense WDM (DWDM) has moved to the forefront for next-generation links. Several approaches exist as light sources for DWDM links; DFB arrays, nonlinear microcombs, and semiconductor mode-locked lasers (MLLs). This paper focuses on quantum dot MLLs (QDMLLs), which currently offer the best efficiency, simplicity, and size. The efficiency of optical combs generated by QDMLLs is analyzed in depth in this study. Full article
(This article belongs to the Special Issue Quantum Dot Lasers and Laser Dynamics)
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9 pages, 10651 KiB  
Article
Modulation Characteristics of Period-One Oscillations in Quantum Cascade Lasers
by Binbin Zhao, Yibo Peng, Xingguang Wang and Cheng Wang
Appl. Sci. 2021, 11(24), 11730; https://doi.org/10.3390/app112411730 - 10 Dec 2021
Cited by 2 | Viewed by 3296
Abstract
Quantum cascade lasers subject to tilted optical feedback produce periodic oscillations, quasi-periodic oscillations, and low-frequency oscillations. This work presents the modulation characteristics of period-one (P1) oscillations in a quantum cascade laser with tilted optical feedback. The electrical signal at the oscillation frequency is [...] Read more.
Quantum cascade lasers subject to tilted optical feedback produce periodic oscillations, quasi-periodic oscillations, and low-frequency oscillations. This work presents the modulation characteristics of period-one (P1) oscillations in a quantum cascade laser with tilted optical feedback. The electrical signal at the oscillation frequency is more than 50 dB higher than the noise level, and the electrical linewidth is less than 2.0 kHz. This electrical linewidth is about four orders of magnitude narrower than the optical linewidth (around 16 MHz) of the free-running laser, which suggests that the optical sidebands induced by the P1 oscillations are highly coherent with the main optical mode. In addition, the modulation depth of the optical signal is found to be in the range of 1% to 3.5%. In addition, it is verified in the simulations that the P1 oscillations induce not only amplitude modulation but also frequency modulation due to the phase-amplitude coupling effect. Full article
(This article belongs to the Special Issue Quantum Dot Lasers and Laser Dynamics)
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18 pages, 5870 KiB  
Article
Experimentally Viable Techniques for Accessing Coexisting Attractors Correlated with Lyapunov Exponents
by Joshua Ray Hall, Erikk Kenneth Tilus Burton, Dylan Michael Chapman and Donna Kay Bandy
Appl. Sci. 2021, 11(21), 9905; https://doi.org/10.3390/app11219905 - 23 Oct 2021
Cited by 2 | Viewed by 1499
Abstract
Universal, predictive attractor patterns configured by Lyapunov exponents (LEs) as a function of the control parameter are shown to characterize periodic windows in chaos just as in attractors, using a coherent model of the laser with injected signal. One such predictive pattern, the [...] Read more.
Universal, predictive attractor patterns configured by Lyapunov exponents (LEs) as a function of the control parameter are shown to characterize periodic windows in chaos just as in attractors, using a coherent model of the laser with injected signal. One such predictive pattern, the symmetric-like bubble, foretells of an imminent bifurcation. With a slight decrease in the gain parameter, we find the symmetric-like bubble changes to a curved trajectory of two equal LEs in one attractor, while an increase in the gain reverses this process in another attractor. We generalize the power-shift method for accessing coexisting attractors or periodic windows by augmenting the technique with an interim parameter shift that optimizes attractor retrieval. We choose the gain as our parameter to interim shift. When interim gain-shift results are compared with LE patterns for a specific gain, we find critical points on the LE spectra where the attractor is unlikely to survive the gain shift. Noise and lag effects obscure the power shift minimally for large domain attractors. Small domain attractors are less accessible. The power-shift method in conjunction with the interim parameter shift is attractive because it can be experimentally applied without significant or long-lasting modifications to the experimental system. Full article
(This article belongs to the Special Issue Quantum Dot Lasers and Laser Dynamics)
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Review

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14 pages, 3757 KiB  
Review
Multimode Physics in the Mode Locking of Semiconductor Quantum Dot Lasers
by Frédéric Grillot, Weng W. Chow, Bozhang Dong, Shihao Ding, Heming Huang and John Bowers
Appl. Sci. 2022, 12(7), 3504; https://doi.org/10.3390/app12073504 - 30 Mar 2022
Cited by 8 | Viewed by 2770
Abstract
Quantum dot lasers are an attractive option for light sources in silicon photonic integrated circuits. Thanks to the three-dimensional charge carrier confinement in quantum dots, high material gain, low noise and large temperature stability can be achieved. This paper discusses, both theoretically and [...] Read more.
Quantum dot lasers are an attractive option for light sources in silicon photonic integrated circuits. Thanks to the three-dimensional charge carrier confinement in quantum dots, high material gain, low noise and large temperature stability can be achieved. This paper discusses, both theoretically and experimentally, the advantages of silicon-based quantum dot lasers for passive mode-locking applications. Using a frequency domain approach, i.e., with the laser electric field described in terms of a superposition of passive cavity eigenmodes, a precise quantitative description of the conditions for frequency comb and pulse train formation is supported, along with a concise explanation of the progression to mode locking via Adler’s equation. The path to transform-limited performance is discussed and compared to the experimental beat-note spectrum and mode-locked pulse generation. A theory/experiment comparison is also used to extract the experimental group velocity dispersion, which is a key obstacle to transform-limited performance. Finally, the linewidth enhancement contribution to the group velocity dispersion is investigated. For passively mode-locked quantum dot lasers directly grown on silicon, our experimental and theoretical investigations provide a self-consistent accounting of the multimode interactions giving rise to the locking mechanism, gain saturation, mode competition and carrier-induced refractive index. Full article
(This article belongs to the Special Issue Quantum Dot Lasers and Laser Dynamics)
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