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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 that digital pre-emphasis is of limited value in directly modulated discrete multi-tone transmitters and that the use of larger bandwidth discrete multi-tone is ineffective when the transmission capacity is limited by dispersion.
We investigate coherent-optical subcarrier processing by fiber frequency conversion using an optical comb based beat signal to implement a broadband coherent add/drop architecture. Erasure and replacement of subcarriers over 400-GHz processing bandwidth is successfully demonstrated.
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