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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 29, Iss. 8 — Apr. 15, 2011
  • pp: 1098–1104

Spectrally Efficient Quadrature Duobinary Coherent Systems With Symbol-Rate Digital Signal Processing

Jianqiang Li, Zhenning Tao, Huijian Zhang, Weizhen Yan, Takeshi Hoshida, and Jens C. Rasmussen

Journal of Lightwave Technology, Vol. 29, Issue 8, pp. 1098-1104 (2011)

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An enhanced digital coherent receiver including a novel blind equalization approach and maximum-likelihood sequence detection (MLSD) is proposed for dual-polarization quadrature duobinary (DP-QDB) systems. In virtue of the compact spectrum of DP-QDB signals approaching Nyquist limit, the equalization is implemented at symbol rate, which relaxes the demand on the sampling speed of analog-to-digital converters (ADCs). The proposed symbol-rate receiver is verified by 43Gb/s experiments in the presence of chromatic dispersion and polarization-mode dispersion. This paper also investigates the tolerances to narrowband optical filtering, ADC sampling phase, duobinary-generating filter bandwidth, laser linewidth, and carrier frequency offset. Detailed modulation format comparisons are made among DP-QDB, DP-quadrature-phase-shift keying (QPSK), DP-8 quadrature amplitude modulation (QAM), and DP-16QAM. It is shown that DP-QDB with MLSD well trades off major requirements on advanced modulation formats.

© 2011 IEEE

Jianqiang Li, Zhenning Tao, Huijian Zhang, Weizhen Yan, Takeshi Hoshida, and Jens C. Rasmussen, "Spectrally Efficient Quadrature Duobinary Coherent Systems With Symbol-Rate Digital Signal Processing," J. Lightwave Technol. 29, 1098-1104 (2011)

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