Mode-Multiplexed 620-GBd QPSK Transmission over 1200-km DGD-Compensated Few-Mode Fiber

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Mode-Multiplexed 620-GBd QPSK Transmission over 1200-km DGD-Compensated Few-Mode Fiber

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Low differential group delay

Low differential group delay (DGD) between the modes of a graded-index few-mode fiber is obtained by combining segments with DGD of opposite sign. Transmission of mode-multiplexed 620-GBd QPSK over a record distance of 1200 km is demonstrated.

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