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Mode division multiplexing has become an interesting area of research in the search for further increasing fiber capacity. We review current research directions and report successful MIMO-OFDM transmission over two-mode fiber.
We report successful reception of dual-LP11-mode CO-OFDM signals traversing few-mode compatible optical add/drop multiplexer (OADM). The power penalties for add, drop and through ports are 2.6, 2.4, 0.7 dB, respectively for 3×318 Gb/s OFDM signals.
A first practical 4-stage compensator with ∼1-ms response time is demonstrated for mitigating first- and second-order PMD on 40-Gbit/s RZ-D(Q)PSK. BER and DOP degradations are significantly improved and a power penalty of <0.5-dB is achieved at 10−9 BER under 25-ps DGD and 400-ps2 SOPMD.
We demonstrate the generation of a 1.12-Tb/s superchannel with a net intrachannel-spectral-efficiency (ISE) of 8.6 b/s/Hz, and its transmission over a 76.8-km seven-core-fiber using space-division-multiplexing, achieving a record aggregate ISE of 60 b/s/Hz per fiber.
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