Showing papers by "Antonio Mecozzi published in 2020"
TL;DR: It is shown that random polarization-mode coupling plays a critical role, just like other polarization-independent effects such as fiber bending and twist, in explaining the observed incoherent crosstalk in weakly-coupled multi-core fibers.
Abstract: We develop a theory of crosstalk in weakly-coupled multi-core fibers that accounts for the effect of intra-core polarization-mode coupling. We show that random polarization-mode coupling plays a critical role, just like other polarization-independent effects such as fiber bending and twist, in explaining the observed incoherent crosstalk in weakly-coupled multi-core fibers.
22 citations
01 Jan 2020
TL;DR: The chapter reviews some of the most relevant categories of new DD systems, which include various types of self-coherent systems, novel Stokes receivers, and the recently proposed Kramers–Kronig receiver.
Abstract: This chapter focuses on various high-capacity direct-detection (DD) systems, which include conventional intensity-modulation and direct-detection (IM-DD) systems that have been widely deployed and new DD systems that are under research. The chapter reviews some of the most relevant categories of new DD systems, which include various types of self-coherent systems, novel Stokes receivers, and the recently proposed Kramers–Kronig receiver. It ends with the authors’ view on the future of short-reach systems.
21 citations
TL;DR: An analysis of signal propagation in Space-Division Multiplexed systems in the linear regime where the inclusion of MDL is accounted for by introducing a complex MD vector, which represents SDM systems operating in the regime of strong coupling between modes.
Abstract: Signal propagation in Space-Division Multiplexed (SDM) systems in the linear regime is dominated by the effects of modal dispersion (MD) and mode-dependent loss (MDL). While multiple models have been proposed for characterizing these phenomena separately or to study the effect of MD on MDL, the effect of MDL on the system MD has never been analyzed. In this article, we report such an analysis, where the inclusion of MDL is accounted for by introducing a complex MD vector $\vec{\tau }$ . We show that the signal delay spread, quantified by the duration of the intensity impulse response function, is not affected by the presence of MDL, and its functional dependence on $\vec{\tau }$ remains the same as in the absence of MDL (in which case $\vec{\tau }$ is a real-valued vector). The model, which represents SDM systems operating in the regime of strong coupling between modes, is validated by comparison with experimental data.
18 citations
01 Dec 2020
TL;DR: In this paper, combined SDM/WDM transmission over a deployed and cabled 4-core coupled-core fibers over distances up to 4014 km for QPSK and 2768 km for 16QAM signals is presented.
Abstract: We show combined SDM/WDM transmission over a deployed and cabled 4-core coupled-core fibers over distances up to 4014 km for QPSK and 2768 km for 16QAM signals. The results confirm the technical viability of coupled-core fibers in the field.
15 citations
01 Dec 2020
TL;DR: In this article, the impulse response of cabled coupled-and uncoupled multi-core fibers over 100 nm in the C-and L-band was measured and the results provided insights to the properties of deployed SDM fibers for usage in transmission and distributed sensing.
Abstract: We measure the impulse response of cabled coupled- and uncoupled multi-core fibers over 100 nm in the C- and L-band. Our results provide insights to the properties of deployed SDM fibers for usage in applications such as transmission and distributed sensing.
7 citations
10 May 2020
TL;DR: In this article, the authors measured inter-core skew in a deployed 4-core fiber, observing maximum variation of < 1.5 ps on a 25.2 km link over a 48-hour period and static skew of 1.12 ns for 6.3 km span.
Abstract: We measure inter-core skew in a deployed 4-core fiber, observing maximum variation of < 1.5 ps on a 25.2 km link over a 48-hour period and static skew of 1.12 ns for 6.3 km span, both similar to measurements in spooled fibers.
5 citations
01 Dec 2020
TL;DR: In this paper, the authors show that random polarization-mode coupling can explain observed inter-core crosstalk values in uncoupled multi-core fibers, and good agreement between theory and experiments is obtained.
Abstract: Existing models for inter-core crosstalk in uncoupled multi-core fibers neglect intra-core random polarization-mode coupling, and conjecture other mechanisms to justify experimental findings. In this work we show that random polarization-mode coupling can explain observed crosstalk values. Good agreement between theory and experiments is obtained.
5 citations
08 Mar 2020
TL;DR: Observations show a reduction of propagation delay fluctuations over deployed fibers but similar inter-core skew behavior on spooled and field-deployed multicore fibers.
Abstract: We compare fluctuations of propagation delay and inter-core skew on spooled and field-deployed multicore fibers. Our observations show a reduction of propagation delay fluctuations over deployed fibers but similar inter-core skew behavior.
5 citations
TL;DR: With this procedure, the continuous-wave tone that accompanies the received signal is reduced by 5 dB to 6 dB compared to the requirement of a KK receiver alone.
Abstract: We report a scheme for reconstructing the complex envelope of an optical signal from two decorrelated measurements of its intensity. The decorrelation is achieved by splitting the received optical signal into two copies, and by dispersing one of the copies prior to photo detection. The reconstructed complex-valued signal is obtained by means of an iterative algorithm that requires only a few tens of iterations. The starting point of the search procedure is produced by Kramers–Kronig (KK) reconstruction. With this procedure, the continuous-wave tone that accompanies the received signal is reduced by 5 dB to 6 dB compared to the requirement of a KK receiver alone.
5 citations
TL;DR: This joint issue of Optics Express and Optical Materials Express features 18 state-of-the art articles that witness actual developments in nonlinear optics, including those by authors who participated in the international conference Nonlinear Optics held in Waikoloa, Hawaii from July 15 to 19, 2019.
Abstract: This joint issue of Optics Express and Optical Materials Express features 18 state-of-the art articles that witness actual developments in nonlinear optics, including those by authors who participated in the international conference Nonlinear Optics held in Waikoloa, Hawaii from July 15 to 19, 2019. As an introduction, the editors provide a summary of these articles that cover all aspects of nonlinear optics, from basic nonlinear effects and novel frequency windows to innovative nonlinear materials and devices, thereby paving the way for new nonlinear optical concepts and forthcoming applications.
TL;DR: In this paper, a joint issue of Optics Express and Optical Materials Express features 18 state-of-the-art articles that witness actual developments in nonlinear optics, including those by authors who participated in the international conference Nonlinear Optics held in Waikoloa, Hawaii from July 15 to 19, 2019.
Abstract: This joint issue of Optics Express and Optical Materials Express features 18 state-of-the art articles that witness actual developments in nonlinear optics, including those by authors who participated in the international conference Nonlinear Optics held in Waikoloa, Hawaii from July 15 to 19, 2019. As an introduction, the editors provide a summary of these articles that cover all aspects of nonlinear optics, from basic nonlinear effects and novel frequency windows to innovative nonlinear materials and devices, thereby paving the way for new nonlinear optical concepts and forthcoming applications.