Mode scrambler

About: Mode scrambler is a research topic. Over the lifetime, 896 publications have been published within this topic receiving 13595 citations.

PMD measurements of two-mode fibers using mode coupler based on fixed analyzer technique

Abstract: We propose PMD measurements of the LP 11 mode in two-mode fibers using mode coupler based on the fixed analyzer technique. For the first time, we have successfully measured the PMD values of the LP 11 mode.

Design of rectangular waveguides for integrated optics with mode matching techniques

Abstract: Rectangular core waveguides for integrated optics have been designed by the mode matching (transverse resonance) method. To achieve good coupling between the waveguides and an optical fiber, the core cross section of the waveguide at the fiber/waveguide interface has been optimized with regard to minimum coupling loss. In calculating the overlap integral between the fundamental mode of the waveguide and the fiber a very accurate fiber model has been used. Calculations of the effective index and the field distribution of the fundamental fiber mode with this model have been compared with analytic results for circular step-index-fibers. The convergence behavior and accuracy of overlap integral calculations with the mode matching method has been investigated. The calculations show that losses as low as 0.16 dB can be reached for waveguides with refractive index contrasts in the whole range 0.5 to 2%.

Analysis of High Power Millimeter Wave Waveguide Mode Converters with Input Mode Mixture

Abstract: Based on the coupled mode theory, this paper presents the study on the influence of input mode mixture in circular oversized waveguide mode converters. Three kinds of commonly used waveguide mode converters, including the waveguide mode converters with varying wall radius or small axis perturbations, and the waveguide mode converters with bent structures, are taken as the examples. The results show that the spurious input modes do not simply superimpose onto the output modes, and in some cases they may deteriorate the conversion efficiency for the main output mode. Methods for transforming such spurious input mode mixture simultaneously into the main output mode are also presented in this paper.

Wideband and Low-Loss Mode Scrambler for Few-Mode Fibers Based on Distributed Multiple Point-Loads

Abstract: We propose a new type of all-fiber mode scrambler for mode division multiplexed data transmission based on few mode fibers. By randomly placing multiple point-loads along the fiber length, low loss and wideband mode coupling is obtained amongst all the guided modes. The effect of mode coupling is simulated from a single point-load to multiple point-loads with a specific focus on the insertion loss and wavelength dependence. In an exemplar experimental demonstration we present a mode scrambler for step-index two mode fibers incorporating 150 randomly located point-loads. Uniform mode coupling is achieved over the C band with an insertion loss of less than 1 dB.

Saturable mode conversion via strong nonlinear dynamics in a multimode optical fiber

Abstract: We investigate, by theory and experiment, a new regime of nonlinear interaction in optical fibers where both a strong phase-matched parametric amplification and a strong nonlinear mode coupling are present. The intimate interaction between these two processes in a multimode optical fiber results in a novel saturable mode conversion, where the antiStokes appears to be in a spatial mode which is not phase-matched in the four-wave mixing process giving the illusion that the momentum conservation is violated.