Digital Resolution Enhancer Employing Clipping for High-Speed Optical Transmission

Abstract

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Kramers-Kronig Receiver With Digitally Added Carrier Combined With Digital Resolution Enhancer

“…This section provides a brief introduction to the DRE algorithm proposed by Yoffe in [8], for a more in-depth description, the reader is referred to [9], [10].…”

“…For each sample of the input signal, three soft quantization possibilities are selected, then using the dynamic quantization approach as explained in Section II, the input samples are quantized to one of the soft quantization options. Adapted from [10].…”

“…3 and 4, it can be seen that the spectrum quantization noise is shaped and the power of the quantization noise inside the signal band is reduced, increasing the quality of the transmitted signal. The DRE algorithm is set to use L = 5 taps to model the channel and the number of soft quantization levels M was 3, which gives a good trade-off between performance and complexity [10]. These settings will also be used during the experimental validation.…”

“…By reducing the power of the quantization noise inside the signal band, the effective resolution of the DAC system is artificially increased. The DRE algorithm has been previously demonstrated for transmitting high-cardinality signal constellations with low resolution DACs with a limited penalty [9], [10] and has been shown to be advantageous when using probabilistic shaping (PS) [11].…”