Design of Dual-Core Trench Assisted Few Mode- Fiber with Flattened Differential Mode Delay for Mode Division Multiplexing

In this work, a dual-core trench-assisted few-mode fiber (DC- TA-FMF) is proposed, which can support ten linearly polarized (LP) mode groups over the C band. Modal characteristics of the proposed FMF are analyzed with the matrix method. The DC-TA-FMF is proposed with a 13.5% GeO2 doped outer-core layer, a 1% F doped inner-core layer, and fused Silica cladding with an outer trench to manage the dispersion, and optical losses. The fiber parameters and the mole percentage of dopants are precisely selected through simulation to guide 10 LP mode groups (LP01, LP11,LP21, LP02, LP31, LP12, LP 41,LP22, LP03, and LP51) with mode degeneracy. Besides this, the proposed design exhibits large effective-mode area, low differential-mode-delay (DMD), and weak mode coupling across the C-band. The proposed DC- TA-FMF is a potential candidate for new-generation optical communication employing mode-division multiplexing (MDM). The work is carried out on the platform of OptiFiber.