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 Δneff of 0.3 × 10−3 and an effective area Aeff 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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