4 × 240 Gb/s Dense WDM and PDM Kramers-Kronig Detection with 125-km SSMF Transmission

Chen, X.; Antonelli, Cristian; Chandrasekhar, S.; Raybon, G.; Mecozzi, Antonio; Shtaif, Mark; Winzer, Peter J.

doi:10.1109/ecoc.2017.8346207

Cited by 20 publications

(19 citation statements)

References 7 publications

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“…An alternative approach is to use digital signal processing (DSP) based linearization techniques in the receiver. The Kramers-Kronig (KK) scheme, in particular, has been demonstrated to be effective in reconstructing the optical phase from the received signal's envelope provided that the local oscillator-to-signal power ratio (LOSPR) is sufficiently high to satisfy the minimum phase condition [6,7,[9][10][11][12][13][14][15][16]. A third approach, investigated in [17], is to achieve linearization of the receiver without the requirement for additional DSP through the use of a sufficiently high LO power.…”

Section: Introductionmentioning

confidence: 99%

Performance of Kramers–Kronig Receivers in the Presence of Local Oscillator Relative Intensity Noise

Erkılınç

et al. 2019

J. Lightwave Technol.

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There is increasing interest in low-complexity coherent optical transceivers for use in short-reach fiber links. Amongst the simplest configurations is the heterodyne coherent receiver, using a 3-dB coupler to combine the signal with the local oscillator (LO) laser output, and a single photodiode for detection of each polarization. In this paper, through numerical simulations, we investigate the impact of signal-signal beating interference (SSBI) and LO relative intensity noise (RIN) on the performance of such coherent transceivers. Specifically, we assess the performance of two methods to mitigate the SSBI: firstly, the use of high LO laser power and, secondly, the application of digital signal processingbased receiver linearization, specifically, the Kramers-Kronig (KK) scheme. The results indicate that, in the case of a RIN-free LO laser, a strong LO is effective in mitigating SSBI and achieves a similar performance to that of the KK algorithm. However, the required increase in LO-to-signal power ratio (LOSPR) is significant. For example, a 20 dB higher optimum LOSPR was observed in the 28 Gbaud dual polarization 16 QAM system at an optical signal-to-noise power ratio (OSNR) of 22 dB. The drawback of using such a high LOSPR is the increased penalty due to RIN-LO beating terms, which we next investigated. The lower optimum LOSPR, and consequently the lower impact of LO RIN on the performance of the KK receiver lead to a reduction in the pre-FEC BER by over an order of magnitude for LO RIN levels above-140 dBc/Hz.

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Section: Introductionmentioning

confidence: 99%

Performance of Kramers–Kronig Receivers in the Presence of Local Oscillator Relative Intensity Noise

Erkılınç

et al. 2019

J. Lightwave Technol.

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“…Here we find that a LO can be used to remove the requirement for SSBI cancellation, double capacity through polarization multiplexing and enable a simple optical front end for PM-mQAM signal detection. Moreover, as demonstrated by [20], a LO in a transceiver architecture can be re-used, even in heterodyne detection. As such, the addition of a LO to single-photodiode receivers may prove to be more beneficial in terms of added capability, than it is detrimental in terms of cost.…”

Section: Discussionmentioning

confidence: 99%

“…Note that we also forgo the recursive-least squares and maximum-likelihood sequence detection stages placed after phase correction in [21]. There is a clear caveat here that there must be sufficient power available to be used as LO and as the transmit optical carrier for our scheme to be used in the architecture proposed in [20], in order to remove the need for Kramers-Kronig receiver DSP.…”

Section: Discussionmentioning

confidence: 99%

“…While the inclusion of a virtual carrier and SSBI cancellation allows for spectrally efficient QAM modulation, the single-photodiode receivers proposed to date require a LO to allow for polarization multiplexing [16,20,21]. Recently, receivers with a simplified optical front-end using a single-photodiode per polarization were proposed [20,21], using Kramers-Kronig digital processing for SSBI cancellation after detection.…”

Section: Introductionmentioning

confidence: 99%

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Single-photodiode per polarization receiver with signal-signal beat interference suppression through heterodyne detection

2018

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We show that a simplified, single-photodiode per polarization heterodyne receiver is able to directly suppress signal-signal beat interference (SSBI), without the need for cancellation in the digital domain. We characterize performance degradation due to SSBI, and show that a strong LO in the receiver can mitigate SSBI. Transmission of 400 Gb/s-class signals is shown over single fiber spans of up to 160 km, and over field-deployed metropolitan area fiber. These results indicate that a single photodiode can be used to receive complex optical signals in high speed fiber systems without the need for SSBI cancellation in the digital domain.

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“…Clearly, in this situation the use of the KK approach provides a substantial gain in terms of complexity and compactness, and in principle, it involves no performance penalty. The polarization-multiplexed KK transceiver is also a good candidate to reduce the spatial footprint of highchannel-count coherent receivers, and its use in a dense-WDM environment has been demonstrated recently in [10].…”

Section: Introductionmentioning

confidence: 99%

Kramers–Kronig PAM Transceiver and Two-Sided Polarization-Multiplexed Kramers–Kronig Transceiver

Antonelli

Mecozzi

Shtaif

2018

J. Lightwave Technol.

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We propose two transceiver schemes based on Kramers Kronig (KK) detection. One targets low-cost highthroughput applications and uses PAM transmission in combination with direct detection and digital reconstruction of the optical phase. This scheme allows digital compensation of chromatic dispersion and provides a significant improvement in terms of spectral efficiency, compared to conventional PAM transmission. The second scheme targets high-channel-count coherent systems with the aim of simplifying the receiver complexity by reducing the optical components count. This scheme is based on the transmission of two SSB signals that share a transmission laser, each obtained by suppressing either optically or digitally one side of a real-valued signal. At the receiver, the two SSB signals are received separately, after optical de-interleaving, by KK detection, using a single local oscillator laser.

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4 × 240 Gb/s Dense WDM and PDM Kramers-Kronig Detection with 125-km SSMF Transmission

Cited by 20 publications

References 7 publications

Performance of Kramers–Kronig Receivers in the Presence of Local Oscillator Relative Intensity Noise

Performance of Kramers–Kronig Receivers in the Presence of Local Oscillator Relative Intensity Noise

Single-photodiode per polarization receiver with signal-signal beat interference suppression through heterodyne detection

Kramers–Kronig PAM Transceiver and Two-Sided Polarization-Multiplexed Kramers–Kronig Transceiver

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