Sub-rate sampled, non-integer fractionally spaced Volterra nonlinear equalizer for IM/DD systems

As high-speed analog-to-digital converters (ADC) account for a significant portion of the receiver's cost in intensity-modulation (IM)/direct-detection (DD) systems, there have been substantial efforts to employ an ADC operating at a relatively low sampling rate. However, half-symbol-spaced ele...

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Veröffentlicht in:Optics express 2024-07, Vol.32 (15), p.26332
Hauptverfasser: Kim, Jaeyoon, Kim, Hoon
Format: Artikel
Sprache:eng
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Zusammenfassung:As high-speed analog-to-digital converters (ADC) account for a significant portion of the receiver's cost in intensity-modulation (IM)/direct-detection (DD) systems, there have been substantial efforts to employ an ADC operating at a relatively low sampling rate. However, half-symbol-spaced electronic nonlinear equalizers used to compensate for nonlinear waveform distortions commonly operate at 2 samples/symbols, and thus require digital upsampling before the equalization. This implies that the digital signal processing (DSP) at the receiver should also operate at 2 sample/symbol even though the ADC operates at the sub-rate (i.e., 
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.526012