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Based on a three-surface prism, a free space design of the three-spot mode coupler, supporting and modes, is introduced in this letter. We demonstrate 7.68 Tbit/s transmission of three mode division multiplexing (MDM) 8 wavelength division multiplexing (WDM) 320-Gb/s dual-polarization (DP)-32QAM over a 120 km differential-group-delay (DGD)-compensated few-mode...
We verify three mode-division multiplexed×8 wavelength-division multiplexing×320-Gb/s DP-32QAM transmission over a 120km differential-group-delay compensated few-mode fiber using low-loss 3-spot mode couplers based on a single 3-surface prism.
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