Flexible converged photonic and radio systems: a pathway toward next generation Wireless connectivity

The development of ultra-dense mobile networks is contingent on effective co-design of optical and wireless systems. This work proposes the convergence of emerging photonic/radio technologies to form a platform for future wireless communications

Orthogonal chirp-division multiplexing for performance enhanced optical/millimeter-wave 5G/6G communications

Orthogonal chirp-division multiplexing is deployed as a novel waveform in an optical/millimeter-wave system. Enhanced channel estimation gives a 5-dB receiver sensitivity improvement over a conventional OFDM implementation, and compatibility with 256-QAM at 60-GHz is experimentally demonstrated

Flexible V-band mmWave analog-RoF transmission of 5G and WiGig signals using a InP-SiN integrated laser module

In this paper, we have demonstrated analog radio-over-fiber (A-RoF) transmission of 5G (256/512-QAM) and WiGig (64-QAM) signals in the millimeter-wave (mm-Wave) frequency range from 55 GHz - 65 GHz in a system with 10 km fiber and 1 m wireless channels. The system employs a hybrid integrated InP-Si3N4 dual laser module for flexible heterodyne operation in the V-band and a simplified system setup, with respect to our prior demonstrations. The experimental results show excellent performance with bit error ratio (BER) values as low as of 8.46×10-6 and 1.11×10-4, and lowest error vector magnitudes (EVMs) of 2.4 % and 6.1%, achieved for the 5G and WiGig signals, respectively

Flexible optical and millimeter-wave analog-RoF transmission with a silicon-based integrated dual laser module

A hybrid integrated InP-Si3N4 dual tunable laser module is deployed as a highly flexible source for converged optical/mm-wave fronthaul. Experimental results show the wavelength flexible delivery of 5G signals over analog radio-over-fiber, incorporating wireless transmission at 60 GHz, with received EVMs as low as 5%

28 GBd PAM-8 transmission over a 100 nm range using an InP-Si3N4 based integrated dual tunable laser module

This paper describes the detailed characterization of a novel InP-Si3N4 dual laser module with results revealing relative intensity noise (RIN) as low as -165 dB/Hz and wide wavelength tunability (100 nm). The hybrid coupled laser is deployed in an unamplified 28 GBd 8 level pulse amplitude modulation (PAM) short-reach data center (DC) transmission system. System performance, which is experimentally evaluated in terms of received signal bit error ratio (BER), demonstrates the ability of the proposed laser module to support PAM-8 transmission across a 100 nm tuning range with less than 1 dB variance in receiver sensitivity over the operating wavelength range. Comparative performance studies not only indicate that the proposed source can outperform a commercial external cavity laser (ECL) in an intensity modulation/direct detection (IM/DD) link but also highlight the critical impact of RIN in the design of advanced modulation short-reach systems.Science Foundation Ireland (12/RC/2276_P2, 13/RC/2077_P2, 16/RI/3698, 18/EPSRC/3591, 18/SIRG/5579)

Next generation hybrid optical & wireless systems for converged access networking

The rise in the number of internet connections, be it humans or machines, has led to demand for higher capacity and datarates on an individual level. This is further enhanced by the introduction of data-hungry applications that include augmented reality (AR), virtual reality (VR), artificial intelligence (AI), the Internet of Things (IoT), telemedicine and many more. With the ongoing increase in capacity demands from fixed-line and wireless networks, there is a drive to converge the vast bandwidth provided by optical access networks with the mobility provided by the wireless access networks to enable a range of multi-gigabit services to the end-users. Particular focus is paid to communication technologies, such as optical heterodyning and analog-radio-over fiber (ARoF), that support optical-wireless integration in a spectrally efficient and cost effective manner. Moreover, components and technologies in support of converged networks are deployed to enable high-capacity advanced modulation schemes and the use of very high frequency radio-frequency (RF) carriers. The photonic integrated circuits (PIC) will play a key role in the development of economic links as many transmitters and modulators can be integrated on a single chip. In this work I present a novel, integrable, ultra-flexible and low noise optical source that can be employed to provide millimeter wave (mmWave) frequency transmission systems for high throughput applications in combination with advanced detection techniques. The wavelength flexibility feature of this optical source permits the best use of available fiber in a reconfigurable network environment while the ability to vary the RF carrier frequencies can allow different RF standards to be used, enabling future network upgrades to higher carrier frequencies in the THz range. This work also demonstrates a true optical-wireless multi-service convergence by pairing the ultra flexible silicon photonics (SiP) based sources with an optical switch fabric; enabling the dynamic provisioning of broadband, RoF and mmWave signals solely in the optical domain. Finally, for datacenter interconnects, the utilization of low noise optical transmitters to handle multi-level signaling, like PAM-N formats, is vital. The low noise optical source is deployed to provide high bandwidth intra-datacenter interconnect capability. Through these system demonstrations, this work highlights a platform to facilitate the flexible transmission of various service types throughout a fully converged optical network

The value of open-source clinical science in pandemic response: lessons from ISARIC

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