Sampling clock jitter effects in digital-to-analog converters

Kurosawa, Naoki; Kobayashi, Haruo; Kogure, Hideyuki; Komuro, Takashi; Sakayori, Hiroshi

doi:10.1016/s0263-2241(01)00028-8

Cited by 30 publications

(10 citation statements)

References 11 publications

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“…When the Rx filtering is not matched to the Tx pulse shape and the optical channel, this can result in insufficient electrical bandwidth and noise enhancement. The proposed method leverages Tx and Rx static filters compensation capability, of the channel frequency response, such that they effectively constitute a matched filter pair hence maximizing SNR at the input of the Rx adaptive filters [54,55]. With the filtering models representing real optical links and components, as well as the emulation of PDL, we showed an improvement in overall system performance.…”

Section: Discussionmentioning

confidence: 97%

Adaptive Pre/Post-Compensation of Cascade Filters in Coherent Optical Transponders

Abdo

D’Amours

2020

Future Internet

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We propose an adaptive joint pre- and post-compensation to correct the filtering effects caused by cascading reconfigurable optical add drop multiplexers (ROADMs). The improvement is achieved without using additional hardware (HW) on the link or within the signal processor in the transponders. Using Monte Carlo simulations, the gradient-descent based method shows an improvement of 0.6 dB and 1.1 dB in the required optical signal-to-noise ratio (R-OSNR) at the threshold pre-decoder bit error rate (BER) of 0.02 versus pre-compensation only in the linear and nonlinear operating region of fiber respectively. We experimentally verified the method with lab measurements in the presence of heavy filtering and optical impairments. We observed a gain up to ~0.4 dB compared to typically used pre-compensation only. Additionally, other tangible system benefits of our method are listed and discussed.

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Section: Discussionmentioning

confidence: 97%

Adaptive Pre/Post-Compensation of Cascade Filters in Coherent Optical Transponders

Abdo

D’Amours

2020

Future Internet

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“…The effects of clock modulation can be modelled by an additive term that contains a discrete sequence of short pulses typically disjoint from each other, as sketched in Figure. 2. This term can be modelled as: (6) where: (7) in which sign(.) is the signum function.…”

Section: B Clock Modulationmentioning

confidence: 99%

Spectral estimation of piece-constant waveforms generated by digital-to-analog converters

D’Arco

Liccardo

Vadursi

2009

2009 IEEE Intrumentation and Measurement Technology Conference

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DACs are frequently utilized to generate non-standard waveforms. In particular any DACs approximate the desired waveform with a piece-constant one, produced by stepping up or down the output voltage of some amount at regular time intervals. The effect of the voltage steps characterizing piececonstant waveforms have been barely investigated in the past years. The paper presents a descriptive model for DACs that takes into account the piece-constant nature of the output waveform as well as non-idealities, such as time-base instability and non-linearity errors. The model describes well the behaviour of real DACs and permits to estimate the spectral features of the generated waveform, avoiding some pitfalls the simulation can be responsible for

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“…is a major limitation on the bit resolution (effective number of bits) of these devices, (Reinhardt, 2005). In (Kurosawa, 2002) authors analyze the clock jitter effects on DACs, ( Fig. 1 therein), considering a DAC where a digital input is applied with a sampling clock CLK.…”

Section: Introductionmentioning

confidence: 99%