Showing papers on "Mode scrambler published in 2020"
TL;DR: A general design rule of scrambling-type mode (de)multiplexers (mode scramblers) based on silica planar lightwave circuit (PLC) with small mode-dependent-loss (MDL) is presented for a mode-division multiplexing (MDM) system.
Abstract: A general design rule of scrambling-type mode (de)multiplexers (mode scramblers) based on silica planar lightwave circuit (PLC) with small mode-dependent-loss (MDL) is presented for a mode-division multiplexing (MDM) system. First, we consider four- and eight-mode scramblers and demonstrate that if the number of modes is 2N, it is possible to construct small-MDL mode scramblers by using Y-branch waveguides and mode rotators. Next, a 6-mode scrambler, which can be used for four linearly polarized (LP) mode transmission in MDM system, is considered, and the MDL is large if Y-branch waveguides are cascaded simply, originating from the radiation loss of unwanted modes at the Y-branch. We propose a 2 + 4-type mode scrambler by combining 2- and 4-mode scramblers and demonstrate that it is possible to design a small MDL 6-mode scrambler.
5 citations
02 Mar 2020
TL;DR: In this article, the authors presented a novel design of a fiber-based mode scrambler, which consists of two multimode fibers with half-ball microlens finish, being at some distance and connected via liquid of a certain refractive index.
Abstract: We present a novel design of wholly fiber-based mode scrambler. The device consists of two multimode fibers with halfball microlens finish, being at some distance and connected via liquid of a certain refractive index. The prototype was made using standard components. The laser output profile was proved to be stable and almost entirely independent of input conditions, i.e. varying positions and angles of input laser beam. Moreover, the mode scrambler of the new design shows a very good power throughput, reaching as much as 90% of the light power compared to a single multimode fiber.