Topic
Mode scrambler
About: Mode scrambler is a research topic. Over the lifetime, 896 publications have been published within this topic receiving 13595 citations.
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24 Nov 2014
TL;DR: In this article, a spatial multiplexer based on a succession of transverse phases that limits modal crosstalk and injection loss is proposed to limit modal injection loss.
Abstract: We present a new spatial multiplexer based on a succession of transverse phases that limits modal crosstalk and injection loss. We demonstrate a three mode transmission experiment in 20km-long fiber using optical and digital mode separation.
7 citations
TL;DR: Numerically the optical field in the region immediately behind the input facets of dielectric step-index single-mode slab and fiber waveguides is investigated, and visualization of the intensity distributions gives insight into the formation of the fundamental mode and of radiation modes.
Abstract: We investigate numerically the optical field in the region immediately behind the input facets of dielectric step-index single-mode slab and fiber waveguides. Visualization of the intensity distributions gives insight into the formation of the fundamental mode and of radiation modes. For a more quantitative characterization we determine the amount of optical power and mode purity of the field in core vicinity as a function of propagation distance. The investigation assists in designing and optimizing waveguides being employed as modal filters, e.g. for astronomical interferometers.
7 citations
TL;DR: In this article, the influence of mode coupling on mode group diversity multiplexing (MGDM) in multimode fibers is investigated, and it is found experimentally that in step index fibers mode coupling is very strong among the lowest mode groups.
Abstract: In this paper, the influence of mode coupling on mode group diversity multiplexing (MGDM) in multimode fibers is investigated. It is found experimentally, that in step index fibers mode coupling is very strong among the lowest mode groups. It is confirmed that mode coupling in graded index fibers is negligible. Theoretical and numerical investigation of the system performance in strong mode coupling conditions, indicates need for greater separation of the lowest MGDM channels.
7 citations
TL;DR: In this paper, the parametric interaction in few mode fibers is theoretically and numerically studied in the particular case in which the signal and the idler waves are frequency degenerate but mode nondegenerate.
Abstract: The parametric interaction in few mode fibers is theoretically and numerically studied in the particular case in which the signal and the idler waves are frequency degenerate but mode nondegenerate. Under simplifying hypotheses, we derive analytical formulas for the phase-insensitive and phase-sensitive amplification gain and conversion efficiency. The analytical formulas are in very good agreement with the numerical solutions of a full vectorial model that takes into account losses, mode coupling, and all possible four-wave mixing interactions. In the phase-sensitive regime, we predict that for small input pump powers, a large and tunable phase-sensitive extinction ratio can be achieved on one mode, whereas the other mode power remains essentially unaffected. Finally, in the high-gain regime, the self-equalization of the output power on different modes can be also achieved.
7 citations
TL;DR: In this article, the authors used the numerically efficient finite element method (FEM) to design a tapered photonic crystal fiber with a large mode area that could be efficiently coupled to an optical fiber.
Abstract: A rigorous modal solution approach based on the numerically efficient finite element method (FEM) has been used to design a tapered photonic crystal fiber with a large mode area that could be efficiently coupled to an optical fiber. Here, for the first time, we report that the expanded mode area can be stabilized against possible fabrication tolerances by introducing a secondary surrounding waveguide with larger air holes in the outer ring. A full-vectorial -field approach is employed to obtain mode field areas along the tapered section, and the Least Squares Boundary Residual (LSBR) method is used to obtain the coupling coefficients to a butt-coupled fiber.
7 citations