Abstract

We propose a strongly coupled ring core fiber for mode-division multiplexed (MDM) transmission with multiple-input multiple-output (MIMO) digital signal processing (DSP) supporting two linearly polarized (LP) modes over the C-band. We show numerically that the mode coupling efficiency of ring-core fiber can be increased by optimizing the structural parameters of the fiber based on an S-bend model. Accordingly, the coupling coefficient is successfully controlled using ring-core fiber fabricated with an effective index difference between the modes Δn_eff of 0.3 × 10⁻³ and an effective area A_eff of 290 μm² for the LP₀₁ and LP₁₁ modes. Finally, we experimentally demonstrate the applicability of our fiber to MDM transmission with MIMO DSP, and successfully reduce the signal quality difference by employing mode coupling in a fabricated 15.4-km fiber.

© 2017 IEEE

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