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A five-mode multiplexer/demultiplexer based on a partially elongated five-core fiber is presented. Multiplexing operation is experimentally verified. Mode selectivity higher than 95% at 1550 nm, for both the LP11 and the LP21 mode, is achieved.
Few-mode multicore fibre (FM-MCF) is a candidate for next-generation fibre which can drastically improve transmission capacity. Design requirements for FM-MCF and characteristics of a three-mode 12-core fibre that we fabricated are reviewed.
Fiber-length dependence of cutoff-wavelength of trench-assisted multi-core fiber is investigated. It is clarified theoretically and experimentally that the different cutoff-wavelength behavior between cores is associated with confinement losses of higher-order modes.
A novel technique to suppress a higher-order mode in bent large-mode-area multi-cladding fibers is presented. 2-dB suppression of LP02 mode is observed on a fabricated double-cladding fiber with 140-mm diameter bend.
A novel technique to suppress the higher-order mode in a bent large-mode-area triple-cladding fiber is experimentally presented. 3-dB suppression of LP02 mode is observed on a fabricated triple-cladding fiber with 130-mm diameter bend.
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