Cladding-Rods-Assisted Depressed-Core 9-LP-Mode Fiber with Improved Modal Spacing

We report the design of a cladding-rods-assisted depressed-core 9-LP-mode fiber featuring more equally spaced modal effective indices, suitable for high-spatial-density uncoupled mode-division-multiplexing systems. It exhibits improved modal spacing (≥1.0×10<sup>−3</sup>) and large modal effective areas (≥127 μm<sup>2</sup>).

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