10 Gbps DPSK transmission over free-space link in the mid-infrared

Su, Yulong; Wang, Wei; Hu, Xiaohong; Hu, Hui; Huang, Xinning; Wang, Yishan; Si, Jinhai; Xie, Xiaoping; Han, Biao; Feng, Huijin; Hao, Qiang; Zhu, Guoshen; Duan, Tao; Zhao, Wei

doi:10.1364/oe.26.034515

Cited by 72 publications

(27 citation statements)

References 29 publications

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“…In the mid-infrared, several strategies have emerged in order to produce high-bandwidth sources emitting in the transparency window around 4 μm. Communication up to 70 Mbits/s was demonstrated with interband cascade lasers (ICLs) 2 and transmission at several Gbits/s was achieved with wavelength down-conversion and up-conversion between 1550 nm and 3594 nm, respectively 3 . With quantum cascade lasers (QCLs), transmission at similar high speeds has been reported both at room 4 and cryogenic temperatures with a free-space television link application 5 .…”

Section: Introductionmentioning

confidence: 99%

Private communication with quantum cascade laser photonic chaos

Spitz

Herdt

et al. 2021

Nat Commun

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Mid-infrared free-space optical communication has a large potential for high speed communication due to its immunity to electromagnetic interference. However, data security against eavesdroppers is among the obstacles for private free-space communication. Here, we show that two uni-directionally coupled quantum cascade lasers operating in the chaotic regime and the synchronization between them allow for the extraction of the information that has been camouflaged in the chaotic emission. This building block represents a key tool to implement a high degree of privacy directly on the physical layer. We realize a proof-of-concept communication at a wavelength of 5.7 μm with a message encryption at a bit rate of 0.5 Mbit/s. Our demonstration of private free-space communication between a transmitter and receiver opens strategies for physical encryption and decryption of a digital message.

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Section: Introductionmentioning

confidence: 99%

Private communication with quantum cascade laser photonic chaos

Spitz

Herdt

et al. 2021

Nat Commun

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“…Several mid-IR FSOC demonstrations have been reported by using nonlinear frequency conversion between 1.55 μm and the mid-IR wavelength before and after the free-space link; in such a way the telecom band laser sources and detectors can be directly used, and high data rates are supported. [10][11][12][13][14][15] However, the high-power requirement and the large size of the nonlinear wavelength conversion modules hinder their practical applications. And in the long run, semiconductor lasers directly emitting at the desirable wavelength are favorable for compact FSOC transceivers.…”

Section: Introductionmentioning

confidence: 99%

Free‐Space Communications Enabled by Quantum Cascade Lasers

Pang

Ozoliņš

Westergren

et al. 2020

Physica Status Solidi (a)

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Future generations of wireless communication systems are expected to support orders of magnitude faster data transfer with much lower latency than the currently deployed solutions. Development of wireless transceivers of higher bandwidth, low energy consumption, and small footprint becomes challenging with radio frequency (RF) electronic technologies. Photonics-assisted technologies show many advantages in generating signals of ultrabroad bandwidth at high carrier frequencies in the millimeter-wave, terahertz, and IR bands. Among these frequency options, the mid-IR band has recently attracted great interest for future wireless communication due to its intrinsic merits of low propagation loss and high tolerance of atmospheric perturbations. A promising source for mid-IR freespace communications is the semiconductor quantum cascade laser (QCL), which can be directly modulated at a high speed and facilitates monolithic integration for compact transceivers. Herein, the research and development of QCL-based freespace communications are reviewed and a recent experimental study of multigigabit transmission with a directly modulated mid-IR QCL and a commercial off-the-shelf IR photodetector is reported on. Up to 4 Gb s À1 transmission of two advanced modulation formats, namely, four-level pulse amplitude modulation (PAM-4) and discrete multitone (DMT) modulation, is demonstrated.

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“…The strong and specific absorption of these molecules in the mid-IR range can thus be used to detect small analyte concentrations, potentially up to parts per billion (ppb), having a high impact in sensing and monitoring applications in fields like environmental monitoring [3], hazard detection [4], industrial process control [5], astronomy [6] or non-invasive medical diagnostics [7]. Moreover, the use of mid-IR PICs has also been proposed as a powerful solution to overcome several major existing drawbacks in other important areas such as thermal imaging [8] or optical communications [9,10]. Among the different materials investigated to develop mid-IR photonic circuits [11][12][13][14][15][16], germanium (Ge) based circuits benefit from both the compatibility with large scale and highperformance fabrication tools and a wide transparency window, extending up to 15 µm wavelength.…”

Section: Introductionmentioning

confidence: 99%

Ge-rich graded SiGe waveguides and interferometers from 5 to 11 µm wavelength range

Montesinos‐Ballester¹,

Vakarin²,

Liu³

et al. 2020

Opt. Express

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The mid-infrared (mid-IR) wavelength range hosts unique vibrational and rotational resonances of a broad variety of substances that can be used to unambiguously detect the molecular composition in a non-intrusive way. Mid-IR photonic-integrated circuits (PICs) are thus expected to have a major impact in many applications. Still, new challenges are posed by the large spectral width required to simultaneously identify many substances using the same photonic circuit. Ge-rich graded SiGe waveguides have been proposed as a broadband platform approach for mid-IR PICs. In this work, ultra-broadband waveguides are experimentally demonstrated within unprecedented wavelength range, efficiently guiding light from 5 to 11 µm. Interestingly, losses from 0.5 to 1.2 dB/cm are obtained between 5.1 and 8 µm wavelength, and values below 3 dB/cm are measured from 9.5 to 11.2 µm wavelength. An increase of propagation losses is seen between 8 and 9.5 µm; however, values stay below 4.6 dB/cm in the entire wavelength range. A detailed analysis of propagation losses is reported, supported by secondary ion mass spectrometry measurement, and different contributions are analyzed: silicon substrate absorption, oxygen impurities, free carrier absorption by residual doping, sidewall roughness and multiphonon absorption. Finally, Mach-Zehnder interferometers are characterized, and wideband operation is experimentally obtained from 5.5 to 10.5 µm wavelength.

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10 Gbps DPSK transmission over free-space link in the mid-infrared

Cited by 72 publications

References 29 publications

Private communication with quantum cascade laser photonic chaos

Private communication with quantum cascade laser photonic chaos

Free‐Space Communications Enabled by Quantum Cascade Lasers

Ge-rich graded SiGe waveguides and interferometers from 5 to 11 µm wavelength range

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