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The newly proposed digital-signal-processing (DSP)-enabled reconfigurable optical add/drop multiplexer (ROADM) without incorporating optical-electrical-optical conversions, referred to as a soft-ROADM, performs dynamic, flexible, and transparent add/drop operations at wavelength, sub-wavelength, and spectrally overlapped orthogonal sub-band levels. The cost-effective soft-ROADMs offer vital software-defined-networking-based...
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