Fiber-Wireless-Fiber Terminals for Optical Wireless Communication over Multiple Bands

Singh, Ravinder; Schreier, Andy; Faulkner, Grahame; O’Brien, Dominic

doi:10.1109/ipc47351.2020.9252288

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…In operation, the FWF system supported WDM channels transmitting data at 1 Tbit/s transmission rates for nomadic operation [35]. Wavelengths across the O and C band can be transmitted simultaneously [40].…”

Section: Fwf Terminalsmentioning

confidence: 99%

Coexistence of Quantum and 1.6 Tbit/s Classical Data Over Fibre-Wireless-Fibre Terminals

Schreier

Alia

Wang

et al. 2023

J. Lightwave Technol.

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In this paper a fibre free-space fibre link that allows a quantum key distribution (QKD) signal and high-speed data to be transmitted in a single optical beam is presented. This setup has the potential to provide ultra-high data rate secure wireless connectivity within indoor spaces. Both quantum and classical channels were transmitted using wavelengths in the C band, over a range of 2.5 m in free space and in the presence of a 200 lx background illumination. Raman noise caused by the light propagating in the optical fibres which provide connections to the free-space segment, together with geometric loss of the free-space link are the major impairments. Results yield secret key rates of 2.343 kbit/s when the QKD signal is sent without high-speed data (and associated Raman noise), and rates of 1.305 -1.996 kbit/s when high-speed data is also transmitted (depending on spectral separation of QKD and classical information). Further, it is shown that the secret key rate can be optimised by increasing loss to attenuate the Raman noise by misalignment of the link. Improvement of the secret key rate from 1.305 kbit/s to 1.887 kbit/s was shown using this method.

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Section: Fwf Terminalsmentioning

confidence: 99%

Coexistence of Quantum and 1.6 Tbit/s Classical Data Over Fibre-Wireless-Fibre Terminals

Schreier

Alia

Wang

et al. 2023

J. Lightwave Technol.

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“…Mirror-based beamsteering approaches are wavelength transparent 11 and can minimise steering losses allowing for maximum transmission rates. 12,13 A QKD handheld showing dynamic motion compensation was demonstrated with symmetrical steering mirrors.…”

Section: Emulated Beamsteeringmentioning

confidence: 99%

Characterising a handheld quantum key distribution system with emulated beam steering

Lowndes

Schreier

O’Brien

et al. 2021

Quantum Technology: Driving Commercialisation of an Enabling Science II

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We present a miniaturised free-space quantum key distribution (QKD) system which allows key exchange between a handheld transmitter and a fixed terminal. The QKD system requires to be optically aligned emphasising the need of a beamsteering unit for later applications. To maintain within the size, weight and power restrictions, the active beamsteering hardware is exclusively located inside the receiver. Our target is consumer use so we present rigorous characterisation against a range of background light levels to show anticipated performance outside of a laboratory environment.Experimental results show a reduction in the raw count rate commensurate with the transmission of the added components (74.5%) and a small degradation of the error rate (0.5 percentage points) due to the worse signal-to-noise ratio. These combine to a 50% reduction in estimated secret key rate of the system with the additional components for beam steering.

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“…Since the precious low-attenuation radio frequency (RF) spectral resources are becoming congested, optical wireless communications (OWC) is growing in popularity, especially in form of fiber-wireless-fiber (FWF) links [1]- [5] for applications demanding multi-Gbit/s connectivity. In our previous research [6]- [8], we have conceived and implemented a pair of FWF terminals for bidirectional indoor communications. The FWF terminals feature fast steering mirrors (FSMs), infrared beacons and complementary metal-oxidesemiconductor (CMOS) cameras to perform beam-steering and tracking.…”

Section: Introductionmentioning

confidence: 99%

“…The design has been tested for terabit/s full-duplex transmission in [6], as well as for orthogonal frequency division multiplexing (OFDM) modulation and automated tracking in [7]. Moreover, the benefits of full-duplex transmission in multiple bands have been demonstrated in [8], showing enhanced spectral agility of the system.…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of Turbo-Coded 20 Gbps Fiber-Wireless-Fiber Optical Links

et al. 2021

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Fiber-wireless-Fiber links require alignment between the transmitter and receiver to a high degree of precision (typically ∼ 0.01 • for a link of a few meters), and channel coding can be used for mitigating the link margin reduction caused by the limited precision of the beam-steering and tracking system. This paper reports results from an experimental study of the misalignment tolerance attained by channel coding. Explicitly, the received power penalties imposed by misalignment are characterized, and then forward error correction techniques are adopted for mitigating the performance degradation inflicted, which is quantified experimentally. Our results characterize trade-offs between coding rate, decoding complexity and the degree of misalignment. Overall, an improvement of the tolerance to misalignment up to ∼ 50% was attained for coded links compared with the uncoded counterpart.INDEX TERMS Optical wireless communications, fiber-wireless-fiber, forward error correction, link misalignment, beam-steering, tracking, dynamic range.

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Fiber-Wireless-Fiber Terminals for Optical Wireless Communication over Multiple Bands

Cited by 4 publications

References 8 publications

Coexistence of Quantum and 1.6 Tbit/s Classical Data Over Fibre-Wireless-Fibre Terminals

Coexistence of Quantum and 1.6 Tbit/s Classical Data Over Fibre-Wireless-Fibre Terminals

Characterising a handheld quantum key distribution system with emulated beam steering

Experimental Characterization of Turbo-Coded 20 Gbps Fiber-Wireless-Fiber Optical Links

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