Linearly polarized vector modes: enabling MIMO-free mode-division multiplexing

Author(s):

Lixian Wang, Reza Mirzaei Nejad, Alessandro Corsi, Jiachuan Lin, Younès Messaddeq, Leslie Rusch, and Sophie LaRochelle

Abstract:

“We experimentally investigate mode-division multiplexing in an elliptical ring core fiber (ERCF) that supports linearly polarized vector modes (LPV). Characterization show that the ERCF exhibits good polarization maintaining properties over eight LPV modes with effective index difference larger than 1 × 10−4. The ERCF further displays stable mode power and polarization extinction ratio when subjected to external perturbations. Crosstalk between the LPV modes, after propagating through 0.9 km ERCF, is below −14 dB. By using six LPV modes as independent data channels, we achieved the transmission of 32 Gbaud QPSK over 0.9 km ERCF without any multiple-input-multiple-output (MIMO) or polarization-division multiplexing (PDM) signal processing.”

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Publication:Optics Express

Issue/Year/DOI: Optics Express Vol. 25, Issue 10, pp. 11736-11749 (2017)

DOI: 10.1364/OE.25.011736

 

New microscopy technique based on position localization of scattering particles

Author(s):

Stefano Luigi Oscurato and Fabio Borbone and Robert Charles Devlin and Federico Capasso and Pasqualino Maddalena and Antonio Ambrosio

Abstract:

“We introduce the Holographic – Single Scatterer Localization Microscopy in which we combine dynamical laser speckle illumination with centroid localization of backscattered light spots in order to localize isolated scattering particles. The reconstructed centroid images show very accurate particle localization, with precision much better than the width of diffraction-limited image of the particles recorded by the CCD. Furthermore, the method provides an improved resolution in distinguishing two very close scattering objects compared to the standard laser scanning techniques and can be assimilated to a confocal technique in the ability of light background rejection in three-dimensional disposition of scattering objects. The illumination is controlled via a digital holography setup based on the use of a spatial light modulator. This allows not only a high level of versatility in the illumination patterns, but also the remarkable characteristics of absence of moving mechanical parts, typical of the laser scanning techniques, and the possibility of strongly miniaturizing the setup.”

Link to Publications Page

Publication: Optics Express

Issue/Year/DOI: Optics Express Vol. 25, Issue 10, pp. 11530-11549 (2017)

DOI: 10.1364/OE.25.011530

 

High power, ultrashort pulse control through a multi-core fiber for ablation

Author(s):

Donald B. Conkey and Eirini Kakkava and Thomas Lanvin and Damien Loterie and Nicolino Stasio and Edgar Morales-Delgado and Christophe Moser and Demetri Psaltis

Abstract:

“Ultrashort pulse ablation has become a useful tool for micromachining and biomedical surgical applications. Implementation of ultrashort pulse ablation in confined spaces has been limited by endoscopic delivery and focusing of a high peak power pulse. Here we demonstrate ultrashort pulse ablation through a thin multi-core fiber (MCF) using wavefront shaping, which allows for focusing and scanning the pulse without requiring distal end optics and enables a smaller ablation tool. The intensity necessary for ablation is significantly higher than for multiphoton imaging. We show that the ultimate limitations of the MCF based ablation are the nonlinear effects induced by the pulse in the MCFs cores. We characterize and compare the performance of two devices utilizing a different number of cores and demonstrate ultrashort pulse ablation on a thin film of gold.”

Link to Publications Page

Publication: Optics Express

Issue/Year/DOI: Optics Express Vol. 25, Issue 10, pp. 11491-11502 (2017)

DOI: 10.1364/OE.25.011491