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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...
Reflective semiconductor optical amplifier (RSOA)-based self-seeded (SS) transmitters have proved to be compact self-tuning transceivers for wavelength division multiplexed passive optical networks (WDM PONs). The small electro-optical bandwidth of currently available RSOA devices limits the maximum bit-rate for each transmitter. We thus propose a self-tuning WDM PON multilevel transmitter based on...
We present the final results of the EU FP7 ERMES project, which focused on the development of a WDM-PON colourless self-tuning transmitter based on RSOA self-seeding. Measurements obtained with a packaged O-band RSOA in a SFP+ compatible transmitter are reported at 1.25, 2.5 and 10 Gb/s for various drop fibre lengths, up to 6.3 km and 1 km respectively. We successfully demonstrated transmission over...
WDM PONs offering point-to-point connectivity, independence of multiple access protocol to share the medium are good candidates for supporting the new fronthaul fibre network requirements. The necessity to allow inventory and maintenance cost reduction will favour WDM PON solutions based on colourless transceivers. We present the proposal of a network embedded self-tuning colourless transmitter, based...
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...
A network-embedded self-tuning cavity based on a self-seeded RSOA is analysed with particular regards to the impact of some parameters that characterize the transmitter. The cavity is defined by the SOA reflective mirror and a Faraday rotator mirror at the remote node, which allows polarization independent operation with low PDG RSOAs. The majority of the cavity is formed by the distribution fibre,...
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