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Recently developed upgrade options for distributed ultra-dense frequency-division multiplexing toward large aggregation capacity are discussed. The concept, originally demonstrated for distributed coherent optical orthogonal frequency-division multiplexing, is based on optical frequency conversion in fiber. It enables precise frequency allocation of the successively multiplexed subcarriers within...
We extend our concept for distributed ultra-dense frequency-division multiplex of single-polarization subcarriers to multiplex of polarization-division multiplexed (PDM) subcarriers. Precise frequency allocation of PDM subcarriers within a 400-Gb/s superchannel is experimentally validated with Nyquist-shaped PDM-QPSK subcarriers.
A concept for distributed ultra-dense frequency-division multiplexing is presented which enables precise frequency allocation without the need of absolute optical frequency control at the multiplexing nodes. We review experiments with OFDM and zero-guard-band Nyquist-WDM to demonstrate the precise generation of superchannels.
We demonstrate the removal of local frequency/phase fluctuations in a distributed coherent-optical orthogonal frequency-division multiplexing (CO-OFDM) scenario. Four 12.5-GBd QPSK subcarriers at symbol rate spacing were multiplexed to 100-Gb/s CO-OFDM without OSNR penalty.
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