Spectrally Efficient 168 Gb/s/λ WDM 64-QAM Single-Sideband Nyquist-Subcarrier Modulation With Kramers–Kronig Direct-Detection Receivers

Li, Zhe; Erkılınç, M. Sezer; Shi, Kai; Sillekens, Eric; Galdino, Lídia; Xu, Tianhua; Thomsen, Benn C.; Bayvel, Polina; Killey, Robert I.

doi:10.1109/jlt.2017.2785858

Cited by 36 publications

(5 citation statements)

References 35 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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“…Recently, the optical SSB Nyquist-subcarriers modulation (SCM) has attracted much attention because of the strong CD resistance, high spectral efficiency and lower PAPR compared to DMT [19], [20]. Although the optical SSB signal is robust against CD-caused power fading, half of the power is lost due to one sideband suppression and extra devices are required for the optical SSB signal generation compared to the optical DSB signal.…”

Section: Introductionmentioning

confidence: 99%

Multi-Rate Nyquist-SCM for C-Band 100Gbit/s Signal over 50km Dispersion-Uncompensated Link

Wang,

Zhou,

Wei

et al. 2021

Preprint

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In this paper, to the best of our knowledge, we propose the first multi-rate Nyquist-subcarriers modulation (SCM) for C-band 100Gbit/s signal transmission over 50km dispersionuncompensated link. Chromatic dispersion (CD) introduces severe spectral nulls on optical double-sideband signal, which greatly degrades the performance of intensity-modulation and direct-detection systems. In the previous works, high-complexity digital signal processing (DSP) is required to resist the CD-caused spectral nulls. Based on the characteristics of dispersive channel, Nyquist-SCM with multi-rate subcarriers is proposed to keep away from the CD-caused spectral nulls flexibly. Signal on each subcarrier can be individually recovered by a DSP with an acceptable complexity, including the feed-forward equalizer with no more than 31 taps, a two-tap post filter, and maximum likelihood sequence estimation with one memory length. Combining with entropy loading based on probabilistic constellation shaping to maximize the capacity-reach, the C-band 100Gbit/s multi-rate Nyquist-SCM signal over 50km dispersion-uncompensated link can achieve 7% hard-decision forward error correction limit and average normalized generalized mutual information of 0.967. In conclusion, the multi-rate Nyquist-SCM shows great potentials in solving the CD-caused spectral distortions.

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“…Recently, a significant effort with advanced modulation formats in optical transmission system has been made to enhance the spectral efficiency, such as filter bank multi carrier (FBMC) modulation [9,10], discrete multi-tone (DMT) [11][12][13] [14], and carrier-less amplitude phase (CAP) [15]. Usually, these advanced modulation formats require high-resolution DAC and ADC, as well as complex digital signal processing (DSP).…”

Section: Introductionmentioning

confidence: 99%

224-Gbps single-photodiode PAM-4 transmission with extended transmitter bandwidth based on optical time-and-polarization interleaving

Fu¹,

Kong²,

Li³

et al. 2020

Opt. Express

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Spectrally Efficient 168 Gb/s/λ WDM 64-QAM Single-Sideband Nyquist-Subcarrier Modulation With Kramers–Kronig Direct-Detection Receivers

Cited by 36 publications

References 35 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

Multi-Rate Nyquist-SCM for C-Band 100Gbit/s Signal over 50km Dispersion-Uncompensated Link

224-Gbps single-photodiode PAM-4 transmission with extended transmitter bandwidth based on optical time-and-polarization interleaving

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