A 1-tap feed-forward equalizer based on InP DHBT cascode amplifier cells for more than 100-GBd optical communication applications

Mettetal, Ronan; Ouslimani, A.; Dupuy, Jean-Yves; Riet, M.

doi:10.1109/ecticon.2016.7561279

Cited by 2 publications

(2 citation statements)

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“…1(a), implemented on-chip [21], or an adaptive analog pre-emphasis circuit would be more efficient as these would provide both equalization and gain [13]- [19]. However, these implementations require sophisticated RF integrated circuit processes to achieve similar bandwidth performance, which will significantly increase both cost and design complexity [15], [16] and may also increase power consumption due to the multiple taps required for equalization [13], [14].…”

Section: Analog Pre-emphasis Filter Designmentioning

confidence: 99%

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Impact of Analog and Digital Pre-Emphasis on the Signal-to-Noise Ratio of Bandwidth-Limited Optical Transceivers

et al. 2020

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The ever-growing machine-to-machine traffic in data centers has stimulated the increase of transceiver data rate from 25 Gb/s/λ to 100 Gb/s/λ and beyond. It is believed that advanced modulation formats and digital-to-analog converters (DACs) will be employed in next generation short-reach transceivers. Digital pre-emphasis techniques are widely employed in DAC-based transceivers to compensate for the high frequency roll-off due to the RF and optoelectronics components in optical transceivers. However, digital pre-emphasis essentially reduces the magnitude of the signal low frequency components for a flat frequency response, which unavoidably increases quantization error, reducing the overall signal-to-noise ratio. This trade-off between SNR and bandwidth conflicts with the high SNR requirement of advanced modulation formats such as the Nyquist-shaped pulse amplitude modulation (PAM). To mitigate the quantization error induced SNR degradation, we show that analog pre-emphasis filters can be used in conjunction with digital pre-emphasis for improved system performance. To understand the impact of the analog pre-emphasis filter on system performance, we analyze the relationship between the flatness of the system frequency response and the SNR degradation due to digital pre-emphasis, and demonstrate 1.1-dB increase of receiver sensitivities, for both 64-Gb/s and 128-Gb/s intensity-modulation direct detection (IM-DD) PAM4 signals, respectively employing a directly modulated laser (DML) and an electroabsorption modulator (EAM).

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Section: Analog Pre-emphasis Filter Designmentioning

confidence: 99%

“…The PAM4 symbols were generated from a pseudo-random binary sequence (PRBS) of length of 2 16 . A root-raised-cosine (RRC) filter with a roll-off factor of 1% was used to generate Nyquistshaped PAM4 digital samples.…”

Section: Experimental Set-upmentioning

confidence: 99%