Demonstration of Free-Space 300-Gbit/s QPSK Communications Using Both Wavelength- and Mode-Division-Multiplexing in the Mid-IR

Zou, Kaiheng; Pang, Kai; Song, Hao; Fan, Jintao; Zhao, Zhe; Zhang, Runzhou; Zhou, Huibin; Minoofar, Amir; Liu, Cong; Su, Xinzhou; Hu, Nanzhe; McClung, Andrew; Torfeh, Mahsa; Arbabi, Amir; Tur, Moshe

doi:10.1364/ofc.2021.w7e.5

Cited by 8 publications

(6 citation statements)

References 8 publications

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“…Based on such a nonlinear process, up to 10 Gbps single-channel transmissions are demonstrated with in-phase and quadrature (IQ) modulated signals [8], [9]. Very recently, by extending this approach with multidimensional multiplexing techniques, MIR FSO transmissions with an aggregated data rate of up to 300 Gbps are demonstrated [10]. However, its inherent hardware complexity and high power consumption can hinder its practical development, compared with the highly integrable semiconductor transceiver technologies developed for fiber-optic and wireless communication systems.…”

Section: Introductionmentioning

confidence: 99%

Direct Modulation and Free-Space Transmissions of up to 6 Gbps Multilevel Signals With a 4.65-$\mu$m Quantum Cascade Laser at Room Temperature

Pang

Schatz

Joharifar

et al. 2022

J. Lightwave Technol.

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A roadmap for future wireless communications is expected to exploit all transmission-suitable spectrum bands, from the microwave to the optical frequencies, to support orders of magnitude faster data transfer with much lower latency than the deployed solutions nowadays. The currently under-exploited mid-infrared (mid-IR) spectrum is an essential building block for such an envisioned all-spectra wireless communication paradigm. Free-space optical (FSO) communications in the mid-IR region have recently attracted great interest due to their intrinsic merits of low propagation loss and high tolerance of atmospheric perturbations. Future development of viable mid-IR FSO transceivers requires a semiconductor source to fulfill the high bandwidth, low energy consumption, and small footprint requirements. In this context, quantum cascade laser (QCL) appears as a promising technological choice. In this work, we present an experimental demonstration of a mid-IR FSO link enabled by a 4.65-µm directly

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Section: Introductionmentioning

confidence: 99%

Direct Modulation and Free-Space Transmissions of up to 6 Gbps Multilevel Signals With a 4.65-$\mu$m Quantum Cascade Laser at Room Temperature

Pang

Schatz

Joharifar

et al. 2022

J. Lightwave Technol.

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“…The main advantage of our method is that it can address any midinfrared wavelength and is not restricted by wavelength up-and downconversion, which remains a promising technique for communication below 4 μm. 39 In fact, these techniques benefit from the maturity of the devices at 1.5 μm in terms of bandwidth, power, and spectral purity to generate a transmitted midinfrared signal. However, the efficiency is still very low (order of mW) and bulky while power-consuming near-infrared pumps (order of multi-W) are needed.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, conventional signal pre- and post-processing is implemented in order to achieve a record transmission at a gross rate of 30 Gbit s−1 with 7% forward-error correction (FEC) overhead using OOK and 40 Gbit s−1 with 27% FEC using OOK and PAM-4 modulation schemes over 31 m, paving the way toward large-scale adoption in telecom applications. The main advantage of our method is that it can address any midinfrared wavelength and is not restricted by wavelength up- and downconversion, which remains a promising technique for communication below 4 μm 39 . In fact, these techniques benefit from the maturity of the devices at 1.5 μm in terms of bandwidth, power, and spectral purity to generate a transmitted midinfrared signal.…”

Section: Introductionmentioning

confidence: 99%

High-capacity free-space optical link in the midinfrared thermal atmospheric windows using unipolar quantum devices

et al. 2022

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. Free-space optical communication is a very promising alternative to fiber communication systems, in terms of ease of deployment and costs. Midinfrared light has several features of utter relevance for free-space applications: low absorption when propagating in the atmosphere even under adverse conditions, robustness of the wavefront during long-distance propagation, and absence of regulations and restrictions for this range of wavelengths. A proof-of-concept of high-speed transmission taking advantage of intersubband devices has recently been demonstrated, but this effort was limited by the short-distance optical path (up to 1 m). In this work, we study the possibility of building a long-range link using unipolar quantum optoelectronics. Two different detectors are used: an uncooled quantum cascade detector and a nitrogen-cooled quantum well-infrared photodetector. We evaluate the maximum data rate of our link in a back-to-back configuration before adding a Herriott cell to increase the length of the light path up to 31 m. By using pulse shaping, pre- and post-processing, we reach a record bitrate of 30 Gbit s − 1 for both two-level (OOK) and four-level (PAM-4) modulation schemes for a 31-m propagation link and a bit error rate compatible with error-correction codes.

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“…An often-adopted approach to carrying out mid-IR FSO system demonstrations is using wavelength conversions [7][8][9][10][11][12]. This approach utilizes the well-developed telecom transceivers and converts the signal wavelength between 1.5 µm and mid-IR based on difference frequency generation (DFG) before and after the FSO link.…”

mentioning

confidence: 99%

“…For example, single-channel transmissions of 10 Gb/s in-phase and quadrature (IQ) modulated signals have been demonstrated [10,11]. Moreover, with wavelength-and mode-division multiplexing techniques, MIR FSO transmissions with a total data rate of 300 Gb/s have been achieved at 3.4 µm [12]. However, the high-power consumption associated with the nonlinear wavelength conversion in such methods leads to energy deficiency and hardware complexity, obstructing practical development.…”

mentioning

confidence: 99%

High-Speed 9.6-μm Long-Wave Infrared Free-Space Transmission With a Directly-Modulated QCL and a Fully-Passive QCD

Joharifar

Dely²,

Pang

et al. 2023

J. Lightwave Technol.

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Free-space optics (FSO) in the mid-infrared (mid-IR) contains rich spectral resources for future ultrahigh-speed wireless communications yet is currently under-exploited. Two atmospheric transmission windows at the mid-IR, namely, the mid-wave IR (MWIR, 3-5 µm) and the long-wave IR (LWIR, 8-12 µm), show great potential in supporting free-space communications for both terrestrial and space application scenarios. Particularly, the LWIR signal with a longer wavelength has high intrinsic robustness against aerosols' scattering and turbulence-induced scintillation and beam broadening effects, which are the main concerns hindering the wide deployment of practical FSO systems. In this context, high-bandwidth semiconductor-based mid-IR FSO transceivers will be desirable to meet the requirements of low energy consumption and small footprints for large-volume development and deployment. Quantum cascade devices, including quantum cascade lasers (QCLs) and quantum cascade detectors (QCDs), appear promising candidates to fulfill this role. In this work, we report a high-speed LWIR FSO transmission demonstration with a 9.6-µm directly-modulated (DM)-QCL and a fully passive QCD without any active cooling or bias voltage. Up to 8 Gb/s, 10 Gb/s, and 11 Gb/s signal transmissions are achieved when operating the DM-QCL at 10°C, 5°C, and 0°C, respectively. These results indicate a significant step towards an envisioned fully-connected mid-IR FSO solution empowered by the quantum cascade semiconductor devices.

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Demonstration of Free-Space 300-Gbit/s QPSK Communications Using Both Wavelength- and Mode-Division-Multiplexing in the Mid-IR

Abstract: We demonstrate free-space wavelength- and mode-division-multiplexed communications in the mid-infrared wavelength region. A total capacity of 300 Gbit/s is achieved using three wavelengths and two orbital angular momentum modes each carrying a 50-Gbit/s QPSK signal.

Cited by 8 publications

References 8 publications

Direct Modulation and Free-Space Transmissions of up to 6 Gbps Multilevel Signals With a 4.65-$\mu$m Quantum Cascade Laser at Room Temperature

Direct Modulation and Free-Space Transmissions of up to 6 Gbps Multilevel Signals With a 4.65-$\mu$m Quantum Cascade Laser at Room Temperature

High-capacity free-space optical link in the midinfrared thermal atmospheric windows using unipolar quantum devices

High-Speed 9.6-μm Long-Wave Infrared Free-Space Transmission With a Directly-Modulated QCL and a Fully-Passive QCD

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