Direct-detection 16-QAM Nyquist-shaped subcarrier modulation with SSBI mitigation

Li, Z.; Erkılınç, M. Sezer; Pachnicke, Stephan; Grießer, Helmut; Thomsen, Benn C.; Bayvel, Polina; Killey, Robert I.

doi:10.1109/icc.2015.7249150

Cited by 8 publications

(8 citation statements)

References 9 publications

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“…An iterative SSBI cancellation technique at the receiver has been proposed and successfully applied to DD virtual SSB optical OFDM (VSSB-OOFDM) systems [25], and this technique has been refined and extended to the DD SSB Nyquist-SCM technique [27,28]. The steps of the technique are described in [25][26][27][28].…”

Section: A Receiver-based Iterative Ssbi Compensation Techniquementioning

confidence: 99%

“…(3) Therefore, the compensated signal only contains the DC and the desired carrier-signal beating terms, and the nonlinear distortion caused by square-law detection is reduced. Typically, three or four iterations are required to reach the fundamental limit of the compensation performance, which results in significant DSP complexity [25][26][27][28].…”

Section: A Receiver-based Iterative Ssbi Compensation Techniquementioning

confidence: 99%

“…Recently, a number of SSBI compensation techniques have been investigated for both OFDM and Nyquist-SCM systems [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], including the use of an optical balanced receiver [19,21], iterative digital pre-distortion [22][23][24] or iterative digital post-compensation [25][26][27][28] schemes. Although the optical scheme provides superior performance, it has the drawback of the significantly increased complexity of the receiver optical hardware, requiring a balanced receiver which includes two single-ended photodiodes and a very narrow optical filter (<1 GHz) to separate the optical carrier from the transmitted signal.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simplified DSP-Based Signal–Signal Beat Interference Mitigation Technique for Direct Detection OFDM

Erkılınç

Bouziane

et al. 2016

J. Lightwave Technol.

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Short-and medium-haul links in inter-data center, access, and metro networks require cost-effective direct-detection (DD) wavelength division multiplexing (WDM) transceivers offering energy efficiency, high information spectral density (ISD) and dispersion tolerance. Single-sideband orthogonal frequency division multiplexing (SSB-OFDM) with direct detection is a potential solution; however, it suffers a penalty from signal-signal beat interference (SSBI) caused by the square-law photodetection. In this paper, a novel DSP-based SSBI mitigation technique, with lower complexity than previously proposed methods, is proposed and assessed through numerical simulations for the first time. The performance improvement is quantified by simulations of 9 × 112 Gb/s 16-QAM SSB-OFDM signal with a net optical ISD of 2.1 (b/s)/Hz. The performance is shown to be similar to that of the more complex receiver-based iterative SSBI compensation technique. Simulations predict an 8.7 dB reduction in the required OSNR at the 7% overhead HD-FEC threshold, and increases of up to 100% in maximum reach over uncompensated standard singlemode fibre (SSMF) using the proposed simplified SSBI compensation technique.

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Section: A Receiver-based Iterative Ssbi Compensation Techniquementioning

confidence: 99%

Section: A Receiver-based Iterative Ssbi Compensation Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simplified DSP-Based Signal–Signal Beat Interference Mitigation Technique for Direct Detection OFDM

Erkılınç

Bouziane

et al. 2016

J. Lightwave Technol.

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“…However, they impose an irreversible loss of phase information [7]. Single sideband (SSB) methods have been explored to obtain amplitude and phase information using direct detection [8]. However, they tend to suffer a strong penalty due to signal to signal beat interference (SSBI) [8].…”

Section: Introductionmentioning

confidence: 99%

Optical Signal Phase Retrieval With Low Complexity DC-Value Method

Patel

Alimi

Muga

et al. 2020

J. Lightwave Technol.

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We propose a novel method to reconstruct the optical signal phase information using direct detection. The method is suitable for minimum phase signals and it enables low complexity, low latency, and low tone power operation. Moreover, the proposed method offers low optical complexity solution for the short-reach links compared with the concurrent phase retrieval techniques. We apply the method to M-ary signals with the transmitted power of as low as 3 dBm, and we are able to reach 70 km for 100 Gb/s quadrature phase shift keying (QPSK) system without optical amplification. Our method is based on the single sideband (SSB) and DC-Value property of the minimum phase signal. The SSB and DC-Value properties are iteratively imposed on the amplitude signal in the frequency domain to recover the full complex field from a directly detected optical signal. The normalized mean square error (NMSE) value between the available amplitude information and reconstructed minimum phase signal amplitude decreases after each iteration, providing global minimum convergence. A constant scaling factor is exploited to improve the convergence speed. The scaling factor provides 6 dB, 4.5 dB, and 2.5 dB error vector magnitude (EVM) gains with 4, 5, and 8 iterations, respectively.

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“…Recently, a number of SSBI compensation techniques have been investigated for optical OFDM systems, including the use of an optical balanced receiver [14,15], digital predistortion [16][17][18] or digital post-compensation [19][20][21][22] schemes. A drawback of the optical scheme is the resulting increased complexity of the receiver optical hardware such as implementing a balanced receiver which includes two photodiodes.…”

Section: Introductionmentioning

confidence: 99%

Signal-signal beat interference cancellation in spectrally-efficient WDM direct-detection Nyquist-pulse-shaped 16-QAM subcarrier modulation

Erkılınç

Pachnicke

et al. 2015

Opt. Express

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An experimental demonstration of direct-detection single-sideband Nyquist-pulse-shaped 16-QAM subcarrier modulated (Nyquist-SCM) transmission implementing a receiver-based signal-signal beat interference (SSBI) cancellation technique is described. The performance improvement with SSBI mitigation, which compensates for the nonlinear distortion caused by square-law detection, was quantified by simulations and experiments for a 7 × 25 Gb/s WDM Nyquist-SCM signal with a net optical information spectral density (ISD) of 2.0 (b/s)/Hz. A reduction of 3.6 dB in the back-to-back required OSNR at the HD-FEC threshold was achieved. The resulting reductions in BER in single channel and WDM transmission over distances of up to 800 km of uncompensated standard single-mode fiber (SSMF) achieved are presented.

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Direct-detection 16-QAM Nyquist-shaped subcarrier modulation with SSBI mitigation

Cited by 8 publications

References 9 publications

Simplified DSP-Based Signal–Signal Beat Interference Mitigation Technique for Direct Detection OFDM

Simplified DSP-Based Signal–Signal Beat Interference Mitigation Technique for Direct Detection OFDM

Optical Signal Phase Retrieval With Low Complexity DC-Value Method

Signal-signal beat interference cancellation in spectrally-efficient WDM direct-detection Nyquist-pulse-shaped 16-QAM subcarrier modulation

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