We propose a holes-assisted few-mode fiber (HFMF) consisting of a GeO2 doped SiO2 core, a SiO2 cladding, and three strategically positioned holes. The incorporation of these holes produces a significant contribution in separating the non-degenerated linearly polarized (LP) modes and degenerated spatial modes, thereby considerably improving the mode spacing. Numerical simulation results demonstrate that our designed HFMF can support 12 spatial modes with the min effective index difference between adjacent non-degenerated LP modes (Δneff) larger...
