Robust 9-QAM digital recovery for spectrum shaped coherent QPSK signal

Bo Huang, Junwen Zhang, Jianjun Yu, Ze Dong, Xinying Li, Haiyan Ou, Nan Chi, Wen Liu

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

We propose 9-ary quadrature amplitude modulation (9-QAM) data recovery for polarization multiplexing-quadrature phase shift keying (PM-QPSK) signal in presence of strong filtering to approach Nyquist bandwidth. The decision-directed least radius distance (DD-LRD) algorithm for blind equalization is used for 9-QAM recovery and intersymbol interference (ISI) compression. It shows the robustness under strong filtering to recover 9-QAM signal rather than QPSK. We demonstrate 112 Gb/s spectrum shaped PM-QPSK signal by wavelength selective switch (WSS) in a 25-GHz channel spacing Nyquist wavelength division multiplexing (NWDM). The final equalized signal is detected by maximum likelihood sequence decision (MLSD) for data bit-error-ratio (BER) measurement. Optical signal-to-noise ratio (OSNR) tolerance is improved by 0.5 dB at a BER of 1x10-3 compared to constant modulus algorithm (CMA) plus post-filter algorithm.
Original languageEnglish
JournalOptics Express
Volume21
Issue number6
Pages (from-to)7216-7221
ISSN1094-4087
DOIs
Publication statusPublished - 2013

Bibliographical note

This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-21-6-7216. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

Keywords

  • Algorithms
  • Blind equalization
  • Detector circuits
  • Intersymbol interference
  • Optical signal processing
  • Quadrature phase shift keying
  • Recovery
  • Quadrature amplitude modulation

Cite this

Huang, B., Zhang, J., Yu, J., Dong, Z., Li, X., Ou, H., ... Liu, W. (2013). Robust 9-QAM digital recovery for spectrum shaped coherent QPSK signal. Optics Express, 21(6), 7216-7221. https://doi.org/10.1364/OE.21.007216
Huang, Bo ; Zhang, Junwen ; Yu, Jianjun ; Dong, Ze ; Li, Xinying ; Ou, Haiyan ; Chi, Nan ; Liu, Wen. / Robust 9-QAM digital recovery for spectrum shaped coherent QPSK signal. In: Optics Express. 2013 ; Vol. 21, No. 6. pp. 7216-7221.
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abstract = "We propose 9-ary quadrature amplitude modulation (9-QAM) data recovery for polarization multiplexing-quadrature phase shift keying (PM-QPSK) signal in presence of strong filtering to approach Nyquist bandwidth. The decision-directed least radius distance (DD-LRD) algorithm for blind equalization is used for 9-QAM recovery and intersymbol interference (ISI) compression. It shows the robustness under strong filtering to recover 9-QAM signal rather than QPSK. We demonstrate 112 Gb/s spectrum shaped PM-QPSK signal by wavelength selective switch (WSS) in a 25-GHz channel spacing Nyquist wavelength division multiplexing (NWDM). The final equalized signal is detected by maximum likelihood sequence decision (MLSD) for data bit-error-ratio (BER) measurement. Optical signal-to-noise ratio (OSNR) tolerance is improved by 0.5 dB at a BER of 1x10-3 compared to constant modulus algorithm (CMA) plus post-filter algorithm.",
keywords = "Algorithms, Blind equalization, Detector circuits, Intersymbol interference, Optical signal processing, Quadrature phase shift keying, Recovery, Quadrature amplitude modulation",
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note = "This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-21-6-7216. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.",
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Huang, B, Zhang, J, Yu, J, Dong, Z, Li, X, Ou, H, Chi, N & Liu, W 2013, 'Robust 9-QAM digital recovery for spectrum shaped coherent QPSK signal', Optics Express, vol. 21, no. 6, pp. 7216-7221. https://doi.org/10.1364/OE.21.007216

Robust 9-QAM digital recovery for spectrum shaped coherent QPSK signal. / Huang, Bo; Zhang, Junwen; Yu, Jianjun; Dong, Ze; Li, Xinying; Ou, Haiyan; Chi, Nan; Liu, Wen.

In: Optics Express, Vol. 21, No. 6, 2013, p. 7216-7221.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Robust 9-QAM digital recovery for spectrum shaped coherent QPSK signal

AU - Huang, Bo

AU - Zhang, Junwen

AU - Yu, Jianjun

AU - Dong, Ze

AU - Li, Xinying

AU - Ou, Haiyan

AU - Chi, Nan

AU - Liu, Wen

N1 - This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-21-6-7216. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

PY - 2013

Y1 - 2013

N2 - We propose 9-ary quadrature amplitude modulation (9-QAM) data recovery for polarization multiplexing-quadrature phase shift keying (PM-QPSK) signal in presence of strong filtering to approach Nyquist bandwidth. The decision-directed least radius distance (DD-LRD) algorithm for blind equalization is used for 9-QAM recovery and intersymbol interference (ISI) compression. It shows the robustness under strong filtering to recover 9-QAM signal rather than QPSK. We demonstrate 112 Gb/s spectrum shaped PM-QPSK signal by wavelength selective switch (WSS) in a 25-GHz channel spacing Nyquist wavelength division multiplexing (NWDM). The final equalized signal is detected by maximum likelihood sequence decision (MLSD) for data bit-error-ratio (BER) measurement. Optical signal-to-noise ratio (OSNR) tolerance is improved by 0.5 dB at a BER of 1x10-3 compared to constant modulus algorithm (CMA) plus post-filter algorithm.

AB - We propose 9-ary quadrature amplitude modulation (9-QAM) data recovery for polarization multiplexing-quadrature phase shift keying (PM-QPSK) signal in presence of strong filtering to approach Nyquist bandwidth. The decision-directed least radius distance (DD-LRD) algorithm for blind equalization is used for 9-QAM recovery and intersymbol interference (ISI) compression. It shows the robustness under strong filtering to recover 9-QAM signal rather than QPSK. We demonstrate 112 Gb/s spectrum shaped PM-QPSK signal by wavelength selective switch (WSS) in a 25-GHz channel spacing Nyquist wavelength division multiplexing (NWDM). The final equalized signal is detected by maximum likelihood sequence decision (MLSD) for data bit-error-ratio (BER) measurement. Optical signal-to-noise ratio (OSNR) tolerance is improved by 0.5 dB at a BER of 1x10-3 compared to constant modulus algorithm (CMA) plus post-filter algorithm.

KW - Algorithms

KW - Blind equalization

KW - Detector circuits

KW - Intersymbol interference

KW - Optical signal processing

KW - Quadrature phase shift keying

KW - Recovery

KW - Quadrature amplitude modulation

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DO - 10.1364/OE.21.007216

M3 - Journal article

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SP - 7216

EP - 7221

JO - Optics Express

JF - Optics Express

SN - 1094-4087

IS - 6

ER -