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ABSTRACT: We demonstrate the first optical wireless link operating in non-direct line-of-sight configuration over typical room distances, with data-rate up to 200 Mbit/s at acceptable bit-error-ratios, under the ambient light noise of usual indoor illumination.
Optical Fiber Communications Conference and Exhibition/National Fiber Optic Engineers Conference (OFC/NFOEC) 2013; 01/2013
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ABSTRACT: In this paper, we experimentally realized a gigabit-class indoor visible light communication system using commercially available RGB White LED and exploiting an optimized DMT modulation. We achieved data rate of 1.5 Gbit/s with single channel and 3.4 Gbit/s by implementing WDM transmission at standard illumination levels. In both experiments, the resulting bit error ratios were below the FEC limit. To the best of our knowledge, these values are the highest ever achieved in VLC systems.
Optics Express 12/2012; 20(26):B501-6. · 3.59 Impact Factor
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ABSTRACT: We report enhanced 10 Gb/s operation of directly modulated bandwidth-limited reflective semiconductor optical amplifiers. By using a single suitable arrayed waveguide grating we achieve simultaneously WDM demultiplexing and optical equalization. Compared to previous approaches, the proposed system results significantly more tolerant to seeding wavelength drifts. This removes the need for wavelength lockers, additional electronic equalization or complex digital signal processing. Uniform C-band operations are obtained experimentally with < 2 dB power penalty within a wavelength drift of 10 GHz (which doubles the ITU-T standard recommendations).
Optics Express 12/2012; 20(26):B507-12. · 3.59 Impact Factor
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ABSTRACT: We present the proof of concept of a wide-band signals distribution network combining plastic optical fiber (POF) and LED-based visible light communication (VLC). The proposed architecture exploits Frequency Division Multiplexing (FDM) of multiple signals, each of which selected at a specific VLC hot-spot. The multiplexed signals are first distributed via a POF; at the hot-spot a given frequency-band is down-converted to baseband and then transmitted through the optical wireless link. We demonstrated a distribution scenario over 50 m POF/2.5 m VLC link of two hot-spots, each having 200 Mbit/s capacity. We employed optimized discrete multi-tone modulation technique with optimal bit/power loading algorithm, maintaining the bit error ratio within the FEC limit.
IEEE International Workshop on Optical Wireless Communications (IWOW) 2012; 10/2012
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ABSTRACT: A visible light communication system is experimentally demonstrated by employing RGB LEDs directly modulated with DMT signal. Data rate of 780 Mbit/s is achieved for the first time at 2.5 m, common indoor ceiling-desk distance.
Asia Communications and Photonics Conference (ACP) 2012; 01/2012
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IEEE Photonics Switching 2012; 01/2012
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ABSTRACT: We demonstrate gigabit-class indoor visible optical wireless transmission using commercial components and DMT modulation of a common visible RGB LED. We obtained 1 Gbit/s single channel and 2.1 Gbit/s WDM transmission at usual illumination levels.
IEEE European Conference and Exhibition on Optical Communication (ECOC) 2012; 01/2012
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ABSTRACT: Vehicular Communication Systems are an emerging type of networks in which vehicles and roadside units are the communicating nodes, providing each other with information, such as safety warnings and traffic information. Vehicle-to-vehicle message exchange is considered the preferred pattern for safety-critical communication (e.g. in anti-collision active systems). Recently, LED-based optical wireless communication has been also proposed for car to car message delivery. This option turns to be particularly effective in short range direct communications to exploit its line-of-sight feature and overcome the issues related to the isotropic nature of radio waves. In this paper we experimentally address this case study making use of two low cost On-Board Unit prototypes, equipped with a common Light Emitting Diode (LED) component at the transmitter and a common PIN photodiode at the receiver
IEEE International Wireless Communications and Mobile Computing Conference 2012; 01/2012
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ABSTRACT: Light Emitting Diodes (LED), which will be increasingly used in lighting technology, will also allow for distribution of broadband optical wireless signals. Visible light communication using white LEDs offers several advantages over the RF-based wireless systems, i.e. license free spectrum, low power consumption, higher privacy. Mostly, optical wireless can provide much higher data rates. In this work, we demonstrate a visible light communication system based on a white LED for indoor broadband wireless access. After investigating the non-linear effects of the LED and the power amplifier, data rate of 1 Gbit/s has been achieved at the standard illuminance level, by using an optimized discrete multi-tone modulation technique and an adaptive bit and power loading algorithm. The bit-error ratio of the received data was 1.5·10-3, which is within the limit of common forward error correction (FEC) coding. These results twice the highest capacity that had been previously obtained.
IEEE Photonics Journal 01/2012; 4(5). · 2.32 Impact Factor
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ABSTRACT: Visible light communication (VLC) using white LEDs is emerging as a key technology for ubiquitous communication systems and has some advantages over the radio frequency counterpart, such as high bandwidth density, licence-free spectrum, security, cost-effectiveness, low energy consumption and dual use (i.e. they simultaneously allow for both data communication and illumination). In this reported work, the integration of radio-over-fibre and VLC technologies, into a hybrid system for indoor communication, is experimentally demonstrated. The system, realised according to the IEEE 802.11g standard, works effectively at typical office luminance level.
Electronics Letters 09/2011; 47(20):1136-1137. · 0.96 Impact Factor
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IEEE European Conference and Exhibition on Optical Communication (ECOC) 2011; 01/2011
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Fotonica Italian National Conference of Photonic Technologies 2011; 01/2011
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ABSTRACT: We report about a Line of Sight Optical Wireless Communication (LoS OWC) system aided by a simplified Visible Light localization algorithm for tracking purposes. We show experimentally that by combining the LoS OWC system with the localization algorithm it is possible to provide a gross datarate exceeding 300 Mb/s over a 90° illumination angle by using a RGB visible-light LED at 90 cm distance.
IEEE GLOBECOM 2011; 01/2011
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ABSTRACT: We experimentally demonstrate unmatched resilience to carrier and signal backscattering in central light seeded PONs. By using RZ modulated R-SOA as uplink transmitter, we obtained error-free uplink communications at 10 dB signal-to-crosstalk level.
Optical Communication (ECOC), 2010 36th European Conference and Exhibition on; 10/2010
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ABSTRACT: In a central light seeded PON, it is shown that the resilience to the Rayleigh backscattering can be strongly different for NRZ or RZ-direct modulated R-SOAs at the OLT. It is experimentally demonstrated that the RZ modulated signal has an increased tolerance to the in-band crosstalk compared to NRZ format, thanks to the spurious chirp. Error-free uplink communications down to 10 dB signal-to-crosstalk level are obtained.
Electronics Letters 08/2010; · 0.96 Impact Factor
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ABSTRACT: We experimentally investigate the all-optical regeneration of constant envelope alternative modulation format signals at 40 Gb/s. The regeneration scheme is based on hard-limiting amplification in a saturated semiconductor optical amplifier (SOA) that can remove the signal intensity noise. Indeed a significant improvement of the signal quality is reported for either polarization shift keying (PolSK) and frequency shift keying (FSK) signal formats, both detected using simple schemes based on direct detection. The regeneration solution, however, is found to be quite limited for non-return-to-zero (NRZ) differential phase shift keying (DPSK) (demodulated using a 1-bit delay interferometer). Indeed, SOA saturation generates a detrimental nonlinear phase noise that can override the reduction of intensity noise.
IEEE Journal of Quantum Electronics 04/2010; · 1.88 Impact Factor
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ABSTRACT: We demonstrate a technique that ameliorates the performance of bidirectional systems impaired by in-band Rayleigh crosstalk, which is common in passive optical access networks based on centralized remote wavelength feeding. The technique is based on the combined use of a suitable line coding and ad hoc postdetection electrical filtering. Therefore, it can be seamless implemented in optical access systems and it is easily scalable with the data rate. We experimentally assess the technique by using a 8B10B coded 1.25-Gb/s signal. We report an increased tolerance to the signal-to-crosstalk ratio by about 5 dB.
IEEE Photonics Technology Letters 02/2010; · 2.19 Impact Factor
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ABSTRACT: A 10 Gbit/s symmetrical WDM-PON exploiting a cross-seeding scheme to enable wavelength reuse and avoid reflection-induced penalties is presented. The use of DPSK modulation format for downstream transmission removes the constraints on the extinction-ratio of the downstream signal. Error-free operation over 25 km of singlemode fibre is demonstrated.
Electronics Letters 01/2010; · 0.96 Impact Factor
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Conference on Laser and Electro-Optics (CLEO) Conference 2010; 01/2010
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Optical Fiber Communication Conference; 01/2010
