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Recently it has been demonstrated that pulse width modulation (PWM) can represent a viable solution for the analog optical fronthaul alternative to standard radio over fibre, which still avoids the bandwidth expansion of the digital fronthaul. The PWM encodes the analog samples at the transmitter onto the duration of the on/off keyed optical signal, splitting the sampling and quantization of the radio...
The EU FP7 ERMES project focused on the development of a wavelength division multiplexed passive optical network (WDM PON) colourless self-tuning transmitter based on reflective semiconductor optical amplifiers (RSOAs) self-seeding. These transmitters represent low cost solutions to achieve self-organized wavelength access networks. The EU ERMES project developed self-tuning transmitters both in the...
We propose an upstream FDM PON architecture exploiting RSOA at the ONU, maintaining NG-PON2 standard layout with flexible bandwidth allocation. 2-Gb/s upstream transmission per user is experimentally demonstrated, targeting 128-Gb/s overall capacity.
Pulse width modulation (PWM) has recently been proposed for analog optical fronthauling in centralized radio access networks (CRANs) to avoid the bandwidth expansion of digital fronthauling (e.g., common public radio interface protocol, CPRI). At the transmitter, the radio-signal is mapped onto the duration of an on/off keyed optical signal, while at the fiber receiving-end each PW optical modulated...
Abstract-- Future (5G) mobile networks aim to pervasivity (cell size < 1 km) and high data-rate (>20-50 Mb/s), centralized radio access network (CRAN) is the most promising paradigm that aggregates the baseband processing to comply with dense antennas deployment. Even if optical networks are the most promising solution for CRAN front-hauling, there is the need to investigate alternative and/or...
We present an experimental analysis on externally seeded colourless transmitters for WDM PON. We take advantage of direct modulation of a high performance MQW RSOA. Chirp is analysed as main limiting factor to SSMF propagation at 10 Gb/s. We demonstrate that off-set filtering performed by the OLT demultiplexer allows to cope with chromatic dispersion impairments and to bridge 24-km SSMF at 10 Gb/s...
The analysis of the impact of mechanical perturbations on the system performance is an important issue to assure robustness in board-to-board and data server interconnections, as required by ETSI recommendations [1]. This robustness has to be guaranteed also in case of optical solutions [2], normally based on multi-mode fiber (MMF) communications, demonstrating easy handling and flexibility. In this...
10-Gb/s operation of a network-embedded self-tuning transmitter exploiting a high-PDG RSOA in a polarization preserving configuration based on two-Faraday rotators, is demonstrated bridging up to 52 km of NZD- fibre. The dispersive load tolerance is finally analysed.
Optical interconnections and datacom applications will lead up to an increase of the bit rate to 12.5Gb/s in uncooled condition to maintain the low cost requirement. Nowadays, significant progress has been accomplished in the long-wavelength VCSEL technology, leading them to work at 10 Gb/s. We experimentally evaluated the capability of 1.3 mum VCSEL to operate up to 12.5 Gb/s. In particular, error...
We experimentally demonstrate 1.33-mum vertical-cavity surface-emitting laser characterization (linewidth and chirp measurements) and very good propagation performances at multi-Gb/s in single-mode-fiber transmission. Error-free measurements are presented both for 10.3 Gb/s over 40 km and for 12.5 Gb/s over 20 km at different operating temperatures.
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