February 20, 2017

20-Gb/s polarization division multiplexed WDM PON transmitter based on self seeded RSOAs

  • Brenot R.
  • Brunero M.
  • Martinelli M.
  • Parolari P.

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 self-seeding in two RSOAs co-located at the network end (e.g. at the optical network unit (ONU)). The architecture takes advantage of a single cavity which sustains two mode families with orthogonal polarizations, thanks to the exploitation of the Faraday rotator mirror (FRM)-based retracing optical circuit. The multilevel transmission allows a capacity doubling, overcoming the RSOA bandwidth limitations. We analyse the build up and the modulation response of the proposed transmitter when exploiting two O-band RSOAs, showing spectra and output eye diagrams. The polarization division multiplexed transmitter performance from 5 Gb/s to 20 Gb/s are presented with propagation over up to 50-km standard single mode fibre, demonstrating BER below the FEC limit.

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The decoding performance of polar codes strongly depends on the decoding algorithm used, while also the decoder throughput and its latency mainly depend on the decoding algorithm. In this work, we implement the powerful successive cancellation list (SCL) decoder on a GPU and identify the bottlenecks of this algorithm with ...

June 04, 2017

A New PRACH Transmission Scheme in Unlicensed Spectrum

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  • Meng Y.
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For the unlicensed spectrum, the occupied bandwidth requirement is demanded by some regulations. The legacy scheme of Physical Random Access Channel (PRACH) for Long Term Evolution (LTE) cannot satisfy it. In this paper, we propose a novel PRACH transmission scheme to satisfy the requirement of unlicensed spectrum based on preamble ...

June 01, 2017

Mutual service processes in Euclidean spaces: existence and ergodicity

  • Baccelli F.
  • Mathieu F.
  • Norros I.

Consider a set of objects, abstracted to points of a spatially stationary point process in R-d, that deliver to each other a service at a rate depending on their distance. Assume that the points arrive as a Poisson process and leave when their service requirements have been fulfilled. We show ...