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Articles by Guobin Ren
Metasurface-based terahertz TE10-TE01 mode converter
We designed a compact broadband mode converter based on metasurface technology, operating in the 180–210 GHz band (the effective bandwidth is approximately 22 GHz), which achieves high-efficiency conversion from the ${{\rm TE}_{10}}$ mode in a standard WR-4 rectangular waveguide to the ${{\rm TE}_{01}}$ mode in a circular waveguide.
Study on the phenomenon of double dominant modes in a ring-core structure fiber
The fiber with ring-core structure (or called vortex fiber) is mainly used for transmitting orbital angular momentum (OAM) modes. When the refractive index of the core is 10−2 lower than that of the ring, a phenomenon that we named double dominant modes will appear.
Gain equalization for a few-mode erbium-doped fiber amplifier supporting eight spatial modes
A trench-assisted ring few-mode erbium-doped fiber amplifier (FM-EDFA) supporting eight spatial modes is designed and proposed in this work. The gain equalization for the FM-EDFA is achieved by selecting the appropriate doping radius and concentration using a particle swarm optimization (PSO) algorithm when only the pump in the fundamental mode (${{\rm LP}_{01}})$ is applied.
Brillouin scattering induced by shear acoustic mode in a step-index fiber
Abstract We present the mechanism of backward Brillouin scattering induced by shear acoustic mode (SAM) in a step-index fiber. Unlike a longitudinal acoustic mode with negligible transverse displacement, a SAM has both considerable transverse and longitudinal displacements.
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