Pilot-added carrier-phase recovery scheme for Nyquist M-ary quadrature amplitude modulation optical fiber communication system

Wenbo Zhang; Dongwei Pan; Xiaofei Su; Xiaoguang Zhang; Lixia Xi; Xianfeng Tang

doi:10.3788/COL201614.020601

Journals >Chinese Optics Letters >Volume 14 >Issue 2 >Page 020601 > Article

Chinese Optics Letters
Vol. 14, Issue 2, 020601 (2016)

Pilot-added carrier-phase recovery scheme for Nyquist M-ary quadrature amplitude modulation optical fiber communication system

Wenbo Zhang^1、*, Dongwei Pan², Xiaofei Su², Xiaoguang Zhang^2、**, Lixia Xi², and Xianfeng Tang²

Author Affiliations

¹School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China

²State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China

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DOI: 10.3788/COL201614.020601 Cite this Article Set citation alerts

Wenbo Zhang, Dongwei Pan, Xiaofei Su, Xiaoguang Zhang, Lixia Xi, Xianfeng Tang. Pilot-added carrier-phase recovery scheme for Nyquist M-ary quadrature amplitude modulation optical fiber communication system[J]. Chinese Optics Letters, 2016, 14(2): 020601 Copy Citation Text

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Fig. 1. (a) Proposed PA dual-carriers Nyquist transmission system. (b) Electrical Nyquist signal generation.

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DSP implementation of the multi-stage carrier-phase estimation scheme. The evolutions of the 32-QAM and 128-QAM constellations are shown in two stages.

Fig. 2. DSP implementation of the multi-stage carrier-phase estimation scheme. The evolutions of the 32-QAM and 128-QAM constellations are shown in two stages.

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Fig. 3. Transformation procedures of 128-QAM and 32-QAM into the crossed-signal constellation.

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Fig. 4. BER surface versus PSR and the bandwidth of the pilot LPF at two different laser linewidths for 32-QAM.

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Fig. 5. Actual and estimated PN fluctuations by PA: (a) 32-QAM, and (b) 128-QAM.

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Fig. 6. (a) OSNR penalty versus linewidth symbol rate at BER=3.8×10−3 for 32-QAM. (b) OSNR penalty versus linewidth symbol rate at BER=3.8×10−3 for 128-QAM.

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	32-QAM		128-QAM
CPR scheme	${(Δ f \cdot T_{s})}_{\max}$	$Δ f_{max}$ at 28 Gbaud (MHz)	${(Δ f \cdot T_{s})}_{\max}$	$Δ f_{max}$ at 28 Gbaud (kHz)
PA	$0.5 \times 10^{- 4}$	1.4	$1.4 \times 10^{- 5}$	380
PA + ML	$0.9 \times 10^{- 4}$	2.5	$2.6 \times 10^{- 5}$	740
PA + CCT	$0.9 \times 10^{- 4}$	2.5	$2.9 \times 10^{- 5}$	800
BPS	$0.6 \times 10^{- 4}$	1.7	$1.8 \times 10^{- 5}$	500