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Probabilistic shaping and intrachannel nonlinear compensation are advanced techniques with good potential to increase the reach of future optical transmission systems. While nonlinear compensation has attracted considerable attention from the research community, especially the digital backpropagation algorithm, probabilistic shaping for optical communications remains only partially explored. Both...
In this paper, a novel multidimensional optical OFDM system is investigated for programmable transceivers, saving DSP resources and facilitating scalability at the increase of the number of dimensions. Numerical evaluations show successful 100 Gb/s transmission for different link configurations.
In this paper, we propose a MIMO-OFDM indoor VLC system with orthogonal circulant matrix transform (OCT) precoding and angular receivers to significantly improve the achievable aggregate capacity of equivalent parallel channels. Compared with the conventional MIMO-OFDM based VLC systems, the data streams of LED transmitters in our proposed system are linearly pre-processed with the OCT precoding scheme...
Optical performance monitoring (OPM) is desired for future smart optical networks. 2-D phase portrait contains fruitful waveform information, which can be a valuable tool for OPM. In this paper, we review the generation of 2-D phase portrait by our cost-effective single-channel sampling technique, and its applications for OSNR and dispersion monitoring in different systems.
We propose unequal sideband intensity based modulation scheme called vestigial sideband scheme (VSB) for the radio over fiber system (RoF) using concatenated Mach-Zehnder modulator (MZM) and phase modulator (PM). This scheme can be generated with proper adjustment of the modulation indexes of the modulators. MZM-PM configuration can also be used for generating single sideband (SSB) and carrier suppressed...
We show here that combination of “low-cost” transport solutions based on 100 Gbps DCO-CFP interface and G.657.A2 fibre is able to address long-haul (∼2000 km) WDM transmission applications. A performance comparison is carried out with “premium” solutions based on 100 Gbps coherent OIF-MSA transceivers and legacy G.652.D fibre.
We analyse transparent wavelength routed optical networks using three different fiber types: NZDSF, SMF PSCF, and verify the effectiveness of Hybrid Raman/EDFA Fiber Amplification (HFA) with different pumping levels, up to the moderate 60% pumping regime. Nodes operate on the basis of flexible-grid elastic NyWDM transponders able to adapt the modulation format to the quality-of-transmission of the...
Low-Coherence Interferometry (LCI) is a highly relevant optical measurement technique used in a wide variety of applications from sensing to medical imaging among others due to its non-invasive performance with high axial precision. In this work, a novel structure is proposed with the application of Microwave Photonics (MWP) as key enabling technology for real-time LCI applications. The proposed MWP-LCI...
In this paper, a new bidirectional pumping scheme with dual order forward pumps is proposed. Performance is compared numerically with conventional bidirectional and backward only pumping schemes for a 70 nm bandwidth, 61.5 km distributed Raman amplifier. We demonstrate that it is possible to design a flat gain spectrum with improved noise figure and OSNR, as well as a low gain ripple (< 1 dB).
In this paper, average bit error rate (BER) and outage probability are analysed in the free-space optical (FSO) system employing subcarrier intensity modulation (SIM) with differential phase shift keying (DPSK). The FSO channel is described by the lognormal atmospheric turbulence and the pointing error effects. Closed-form analytical expressions for the average BER and outage probability are proposed...
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 future of visible light communication (VLC) systems relies on achieving moderate to high data rates and the ability to design a low complexity system, as these will play a major role in the next generation communication networks. In this paper, we propose, design, and evaluate the use of an adaptive receiver to mitigate the inter-symbol interference (ISI) and improve the overall VLC system performance...
Complementary metal-oxide semiconductor (CMOS) provides an infrastructure for the implementation of a range of integrated photonic devices and circuits that have the potential to replace the state-of-the-art commercial optical devices in telecommunications, providing system-level gains at a lower cost. In this work, we study the potential of CMOS photonics for long-haul communication systems. We compare...
The adoption of a flexible dense wavelength division multiplexed (DWDM) grid in optical transport networks will materialize the envisioned opportunity to capitalize from a more efficient spectrum allocation. Particularly, routing media channels comprising multiple adjacent carriers enables to pack them closer together and use a single pair of guard bands of adaptive size to accommodate filtering impairments...
Visible light communication (VLC) systems have typically operated at data rates below 20 Gbps and operation at this data rate was shown to be feasible by using laser diodes (LDs), beam steering, imaging receivers and delay adaptation techniques. However, an increase in the computational cost is incurred. In this paper, we introduce fast computer generated holograms (FCGHs) to speed up the adaptation...
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