Wireless communication demonstration at 4.1 THz using quantum cascade laser and quantum well photodetector

Chen, Z.; Tan, Zhongxin; Han, Yanling; Zhang, R.; Guo, Xu; Li, Hao; Cao, Juncheng; Liu, H. C.

doi:10.1049/el.2011.1407

Cited by 40 publications

(22 citation statements)

References 8 publications

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“…Terahertz quantum cascade lasers (THz QCLs) are compact, electrically driven sources of radiation in the ∼ 1-5 THz band [1] that hold enormous potential for sensing [2,3] and communication applications [4][5][6][7]. Laser feedback interferometry (LFI) with THz QCLs is a recently-developed coherent sensing technique [8][9][10], ideally-suited to the development of compact sensing systems, in which radiation is reflected back into the internal laser cavity from an external target of interest.…”

Section: Introductionmentioning

confidence: 99%

Model for a pulsed terahertz quantum cascade laser under optical feedback

Agnew¹,

Grier²,

Taimre³

et al. 2016

Opt. Express

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Abstract:Optical feedback effects in lasers may be useful or problematic, depending on the type of application. When semiconductor lasers are operated using pulsed-mode excitation, their behavior under optical feedback depends on the electronic and thermal characteristics of the laser, as well as the nature of the external cavity. Predicting the behavior of a laser under both optical feedback and pulsed operation therefore requires a detailed model that includes laser-specific thermal and electronic characteristics. In this paper we introduce such a model for an exemplar bound-to-continuum terahertz frequency quantum cascade laser (QCL), illustrating its use in a selection of pulsed operation scenarios. Our results demonstrate significant interplay between electro-optical, thermal, and feedback phenomena, and that this interplay is key to understanding QCL behavior in pulsed applications. Further, our results suggest that for many types of QCL in interferometric applications, thermal modulation via low duty cycle pulsed operation would be an alternative to commonly used adiabatic modulation.Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. 4, 631-633 (2014). 11. G. Giuliani, M. Norgia, S. Donati, and T. Bosch, "Laser diode self-mixing technique for sensing applications," J. Opt.A 1937-1942 (2016

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Section: Introductionmentioning

confidence: 99%

Model for a pulsed terahertz quantum cascade laser under optical feedback

Agnew¹,

Grier²,

Taimre³

et al. 2016

Opt. Express

View full text Add to dashboard Cite

show abstract

“…Due to the absence of relaxation oscillations, the high speed dynamic performance of THz QCLs may be superior to that of diode lasers, potentially making them attractive for high bandwidth communications. 5,6 The modulation bandwidth of mid-infrared (mid-IR) QCLs varies significantly with respect to the bias current, 7 but this effect has not been fully investigated in THz QCLs.…”

mentioning

confidence: 99%

Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations

Agnew

Grier

Taimre

et al. 2015

Applied Physics Letters

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Terahertz-frequency quantum cascade lasers (THz QCLs) based on bound-to-continuum active regions are difficult to model owing to their large number of quantum states. We present a computationally efficient reduced rate equation (RE) model that reproduces the experimentally observed variation of THz power with respect to drive current and heat-sink temperature. We also present dynamic (time-domain) simulations under a range of drive currents and predict an increase in modulation bandwidth as the current approaches the peak of the light–current curve, as observed experimentally in mid-infrared QCLs. We account for temperature and bias dependence of the carrier lifetimes, gain, and injection efficiency, calculated from a full rate equation model. The temperature dependence of the simulated threshold current, emitted power, and cut-off current are thus all reproduced accurately with only one fitting parameter, the interface roughness, in the full REs. We propose that the model could therefore be used for rapid dynamical simulation of QCL designs.

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“…Knowing the temporal and spectral dynamics of THz QCL enables us to understand the complex behavior of THz QCL and optimize the structure design. Furthermore, analysis of the temporal and spectral output of THz QCL is significantly important for promoting its applications in spectroscopy [8], security detection [9]and THz communication [10].…”

mentioning

confidence: 99%

Quantum Transmission Line Modeling and Experimental Investigation of the Output Characteristics of a Terahertz Quantum Cascade Laser

Xia

Rubino

et al. 2020

IEEE Trans. THz Sci. Technol.

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We describe a new approach to modelling the optoelectronic properties of a terahertz-frequency quantum cascade laser (THz QCL) based on a quantum transmission line modelling (Q-TLM) method. Parallel quantum cascade transmission line modelling units are employed to describe the dynamic optical processes in a nine-well THz QCL in both the time and frequency domains. The model is used to simulate the current-power characteristics of a QCL device and good agreement is found with experimental measurements, including an accurate prediction of the threshold current and emitted power. It is also confirmed that the Q-TLM model can accurately predict the Stark-induced blue shift of the emission spectrum of the THz QCL with increasing injection current. Furthermore, we establish the new Q-TLM model to describe the properties of a THz QCL device incorporating a photonic lattice patterned on the laser ridge, by linking the transmission line structure to each scattering module. The predicted effects of the lattice structure on the steadystate emission spectra of the THz QCL, including the side-mode suppression, are found to be in good agreement with experimental results. Our Q-TLM modelling approach is a promising tool for the future design of THz QCLs and analysis of their temporal and spectral behaviors.

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Wireless communication demonstration at 4.1 THz using quantum cascade laser and quantum well photodetector

Cited by 40 publications

References 8 publications

Model for a pulsed terahertz quantum cascade laser under optical feedback

Model for a pulsed terahertz quantum cascade laser under optical feedback

Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations

Quantum Transmission Line Modeling and Experimental Investigation of the Output Characteristics of a Terahertz Quantum Cascade Laser

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