It is expected that the power deposition can be well localized in the plasma central region. These are small enough compared with the plasma minor radius (15 cm). The launching system effectively focuses the Gaussian beam in the free space to a 2-cm (poloidal) 3-cm (toroidal) e-folding power spot size. This indicates that the oversized corrugated waveguides act as a mode filter. From measurement of radiation patterns, it was confirmed that the WGM was effectively converted into the Gaussian-like beam, and the emergent radiation profile from the tubular oversized corrugated waveguide was close to a circular Gaussian one even when the beam coupled to the HE mode had the side lobes before the transmission. The system consists of a pulse gyrotron with TE whispering gallery mode (WGM) output, conversion system of the WGM into the Gaussian-like beam, transmission line for HE mode, and. This system is designed to operate at 106-GHz frequency with a half-megawatt output power. In addition, the impact of the linear and nonlinear inter-core crosstalk in the error vector magnitude (EVM) is evaluated with the optical transmission of fully-standard LTE-Advanced signals using MIMO and SISO configurations operating in both linear and nonlinear power regimes.Ī new high-power electron cyclotron heating system has been installed for the Heliotron-E helical device. This theoretical analysis is validated experimentally in this work using a homogeneous 4-core optical fiber in radio-over-fiber transmission for LTE fronthaul applications. The nonlinear coupled-mode and coupled-power theories are revisited to demonstrate theoretically that the underlying Kerr effect mismatches the phase constant of the core modes reducing the mean and variance of the crosstalk when nonlinear regime is employed. In this paper, the crosstalk characteristics of multi-core fiber operating in non-linear regime are identified, indicating advantageous performance in optical fronthaul radio-over-fiber transmission. Optical fronthaul networks are expected to employ relatively high optical intensity levels when a large number of cores are connected to a large number of antennas. Optical transmission in multi-core optical media has the potential of great capacity and scalability for current and future optical networks.
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