Multicarrier Group Detection in Receiver-Side Duobinary-Shaped WDM Superchannel Systems

Wang, Hui; Li, Jianqiang; Kong, Deming; Li, Yan; Li, Wei; Wu, Jian; Xu, Kun; Lin, Jintong

doi:10.1109/lpt.2012.2200473

Cited by 5 publications

(9 citation statements)

References 8 publications

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“…Offline digital signal processing (DSP) is firstly started with chromatic dispersion (CD) compensation by using a frequency-domain equalization approach. Then, carrier separation is conducted by 4-point Discrete-Fourier-Transform (DFT) at baseband [7]. Three identical DSP flows are next performed in parallel for the three carriers under investigation.…”

Section: As Shown Inmentioning

confidence: 99%

“…Therefore, given fixed Tx implementation, the detection of more than one carrier is strongly expected for the purpose of efficient utilization of the commercially available analog-to-digital converter (ADC) and decrease of the coherent receiver count. The above ideal of multi-carrier group detection has been investigated in both OFDM and N-WDM superchannel [6,7]. It is desired to extend the ideal of multi-carrier group detection to offset-QAM based CoWDM superchannel.…”

Section: Introductionmentioning

confidence: 99%

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Offset-16QAM-based coherent WDM with multi-carrier group detection

Xiang

Tang

et al. 2015

SPIE Proceedings

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Recently, offset-QAM based coherent WDM (CoWDM) has been proposed to build up spectrally-efficient multi-carrier superchannels. Compared with Nyquist wavelength division multiplexing (N-WDM) and orthogonal frequency division multiplexing (OFDM), offset-QAM based CoWDM can relax the stringent transmitter-side requirements for spectrum shaping and achieve significant transmission performance improvement. In order to efficiently utilize the sampling rate of commercially available analog-to-digital converter (ADC) and decrease the receiver-side implementation complexity, multi-carrier group detection scheme is investigated in offset-QAM based CoWDM where multiple carriers are simultaneously detected within single coherent receiver, followed by carrier separation in the digital domain through the 4-point discrete Fourier transform (DFT) method at the baseband. Here, we demonstrate a transmission of five-carrier 100 Gb/s polarization-multiplexed offset-16QAM signal with 12.5 GHz channel spacing. Through 3-carrier group detection, the sampling rate per-carrier is reduced to 1.33 times symbol rate in terms of 50 GS/s ADC and there is only 0.35 dB required OSNR penalty at BER=10 -3 compared with conventional single channel coherent detection. Meanwhile, good tolerance of coherent receiver analog bandwidth is secured and receiver bandwidth is reduced to 8 GHz. Moreover, 0.5 dB required OSNR penalty at BER=10 -3 is obtained given 18 GHz ADC bandwidth. Besides, we find that side carriers suffer from severer performance degradation than the central carrier with limited ADC resolution and only 0.08 dB and 0.2 dB required OSNR penalty at BER=10 -3 are secured with 6 bits ADC resolution for central carrier and side carriers, respectively.

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Section: As Shown Inmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Offset-16QAM-based coherent WDM with multi-carrier group detection

Xiang

Tang

et al. 2015

SPIE Proceedings

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“…In the prior investigations using DP-QPSK format [10][11][12][13][14][15][16], the symbol rate can be pushed above the carrier/channel spacing to enable the so-called faster-than-Nyquist or sub-Nyquist operation. For example, the symbol rate can go up to 32 Gbaud given a carrier/channel spacing of 25 GHz [13].…”

Section: Optimization Of the Intermediate Response For Dp-16qammentioning

confidence: 99%

“…Like OFDM and Nyquist-WDM, the proposed technique has also been proposed to build up multi-carrier superchannels beyond 100G [15]. In addition, multicarrier group detection was experimentally demonstrated to show the potential of sampling efficiency enhancement and cost reduction [16].…”

Section: Introductionmentioning

confidence: 99%

“…In the most of the previous demonstrations [10,[12][13][14][15][16], the modulation format of dualpolarization quadrature phase-shift keying (DP-QPSK) was exclusively applied. In [11], we attempted to extend the proposed receiver-side spectral shaping technique for dualpolarization 16-ary quadrature amplitude modulation (DP-16QAM), where duobinary was remained as the intermediate response without any optimization.…”

Section: Introductionmentioning

confidence: 99%

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Transmission of 1936 Tb/s (11 × 176 Gb/s) DP-16QAM superchannel signals over 640 km SSMF with EDFA only and 300 GHz WSS channel

Li¹,

Karlsson²,

Andrekson³

et al. 2012

Opt. Express

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With an improved receiver-side spectral shaping technique by introducing and optimizing one tap coefficient in the intermediate response, we successfully transmitted 1.936 Tb/s (11 × 176 Gb/s) DP-16QAM superchannel signal over 8 × 80 km SSMF with EDFA-only and two 280 GHz wavelength selective switches (WSSs) in support of future 1.6 Tb/s Ethernet with up to 20% forward error correction overhead. The 280 GHz 3-dB bandwidth of the WSS passband permits a sufficient guardband if the 1.936 Tb/s superchannel signals are placed in a 300 GHz WSS channel.

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Novel design of phase demodulation scheme for fiber optic interferometric sensors in the advanced undergraduate laboratory

Zhang¹,

Ge²,

Wang³

et al. 2022

Eur. J. Phys.

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Phase modulation depth (PMD) is crucial for phase demodulation scheme of fiber optic interferometric sensors. Novel design of phase generated carrier differential-cross-multiplying (PGC-DCM) demodulation scheme allows undergraduates to understand the operation principle of the sensors and explore the connection between the PMD and the system performance. The system mainly consists of a laser, a fiber Michelson interferometer (FMI), a data acquisition card and a host computer. The simulation signal is firstly applied on the sensing arm of the FMI by a piezoelectric transducer and induces the phase difference shift between the two arms. Then the signal-to-noise ratios (SNRs) of the demodulated signals from PGC-DCM algorithm under different PMD values are tested and an optimum PMD value is found. Thus, a proportion integral differential (PID) module is designed and integrated with the demodulation algorithm to calibrate the PMD to the optimum value. An ellipse fitting algorithm (EFA) is used to estimate the real-time PMD of the system that is then fed into the PID module. The amplitude of laser modulation signal is controlled by the PID module, which is proportional to the PMD. Moreover, the response linearity, dynamic range, total harmonic distortion and phase resolution of the system are investigated.

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Multicarrier Group Detection in Receiver-Side Duobinary-Shaped WDM Superchannel Systems

Cited by 5 publications

References 8 publications

Offset-16QAM-based coherent WDM with multi-carrier group detection

Offset-16QAM-based coherent WDM with multi-carrier group detection

Transmission of 1936 Tb/s (11 × 176 Gb/s) DP-16QAM superchannel signals over 640 km SSMF with EDFA only and 300 GHz WSS channel

Novel design of phase demodulation scheme for fiber optic interferometric sensors in the advanced undergraduate laboratory

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