ATTO: Wireless Networking at Fiber Speed

Torfs, Guy; Li, Haolin; Agneessens, Sam; Bauwelinck, Johan; Breyne, Laurens; Caytan, Olivier; Joseph, Wout; Rogier, Hendrik; Thielens, Arno; Ginste, Dries Vande; Kerrebrouck, Joris Van; Vermeeren, Günter; Yin, Xin; Demeester, Piet

doi:10.1109/jlt.2017.2783038

Cited by 26 publications

(30 citation statements)

References 11 publications

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“…The DL-RAU consists of two tightly integrated subsystems, being the optoelectronic conversion circuit and the antenna. The key component in the optoelectronic conversion circuit is the PIN photodetector, 3 whose active region is illuminated by the optical fiber. As a result, the DL-RAU's photodetector generates a photocurrent that is proportional to the received optical power with responsivity R expressed in units of A W −1 [5], and consists of a direct current (DC), which originates from the average optical power, and a time-varying current, which originates from the intensity modulation and reconstructs the RF signal.…”

Section: Passive Downlink Remote Antenna Unit Designmentioning

confidence: 99%

“…Therefore, to avoid significant nonlinear distortion degrading the link performance, the DL-RAU must be operated at low transmit power, limiting its useful communication range. However, when deploying the DL-RAU in attocells as small as 15 cm × 15 cm, propagation distances are extremely short, and the limited transmit power can be tolerated [3].…”

Section: Passive Downlink Remote Antenna Unit Designmentioning

confidence: 99%

“…This enables centralization of the most expensive equipment, such as the RF transceivers, at a central office (CO), leading to a very flexible system with low complexity. As such, RFoF is a key technology for novel, highly specialized, ultra-high density wireless communication systems as proposed in [3], [4]. These systems target futuristic application scenarios different from the ones conventionally considered in 5G, such as factoryof-the-future environments that are densely populated by numerous autonomous robots.…”

Section: Introductionmentioning

confidence: 99%

“…It describes the design and validation of a novel, fully passive downlink RAU (DL-RAU) intended for an ultra-high density wireless communication system as proposed in [3]. Full passivity implies photodetectors operating at zero bias voltage (0 V), as well as omitting other active components such as transimpedance amplifiers (TIAs).…”

Section: Introductionmentioning

confidence: 99%

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Passive Opto-Antenna as Downlink Remote Antenna Unit for Radio Frequency Over Fiber

Caytan

Bogaert

et al. 2018

J. Lightwave Technol.

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Abstract-A novel remote antenna unit, intended for application in the downlink of an analog radio frequency over fiber system, is proposed, whose radiated power originates entirely from the optical signal supplied by a single multi-mode fiber. By operating the photodetector of the optical receiver at zero bias voltage, while omitting typical active components, such as transimpedance amplifiers, a fully passive unit, requiring no external power supply, is obtained. Instead, a careful co-design is performed to maximize the power transfer from photodetector to antenna within the frequency range of interest using an impedance matching network. A wideband cavity-backed slot antenna is implemented in air-filled substrate-integrated-waveguide technology. The antenna feed plane serves as integration platform for the optical receiver. The resulting downlink remote antenna unit is compact, cost-effective, energy-efficient and extremely reliable. Therefore, it is an ideal building block for novel, highly specialized, ultra-high density wireless communication systems, which require massive amounts of remote antenna units, deployed in attocells as small as 15 cm ×15 cm. A prototype operating in a wide frequency bandwidth ranging from 3.30 GHz to 3.70 GHz is constructed and validated. In free-space conditions, a broadside gain of −0.2 dBi, a front-to-back ratio of 8.8 dB and linear polarization with a cross-polarization level of −28.8 dB are measured at 3.50 GHz. Furthermore, a −3 dB gain bandwidth of 500 MHz is observed. Finally, the prototype is deployed in a unidirectional data link, achieving a symbol rate of 80 MBd over a distance of 20 cm.

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Section: Passive Downlink Remote Antenna Unit Designmentioning

confidence: 99%

Section: Passive Downlink Remote Antenna Unit Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Passive Opto-Antenna as Downlink Remote Antenna Unit for Radio Frequency Over Fiber

Caytan

Bogaert

et al. 2018

J. Lightwave Technol.

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“…In the end, these antenna systems can even be distributed in its environment [4]. Beyond-5G approaches such as proposed in [5] even go further and target thousands of antennas interconnected by fiber infrastructure.…”

Section: Introductionmentioning

confidence: 99%

Real-time all-digital radio-over-fiber LTE transmission

Kerrebrouck

Breyne

et al. 2017

2017 Advances in Wireless and Optical Communications (RTUWO)

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Abstract-Radio-over-fiber is a key-enabling-technology for next generation wireless networks. To support an increasing number of antennas, a CloudRAN approach that maximally aggregates base station functionality of the different antenna sites is the most economically feasible. To support light weight antenna units, analog radio-over-fiber is most promising. To mitigate linearity constraints of optical modulators, an all-digital transmitter can be used. In this paper, LTE transmission is demonstrated over 200 m OM4 multimode fiber using a VCSEL and a resonant transimpedance amplifier. The VCSEL is directly modulated with a high-speed 2-level signal generated in real-time on an FPGA. After reception of this signal, the adjacent channel power ratio was measured to be -45.6 dB. This is within the LTE specifications, proving this is a cost and power effective solution for next generation wireless networks.

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