Abstract

All-optical wavelength conversion (AOWC) plays an important role in the future transparent optical networks, in order to enhance the re-configurability and non-blocking capacity. On the other hand, high-order quadrature amplitude modulations (QAMs) have been extensively studied for achieving the high-speed and high-spectral-efficiency optical transmission. Since high-order QAMs are more sensitive to phase and amplitude noise, to implement an AOWC sub-system suitable for high-order QAM signals with minimized power penalty, it is important to optimize the operation conditions in order to avoid extra nonlinear distortions co-existed in the AOWC process. Our experimental results show that, constellation monitoring provides a more intuitive and accurate approach to monitor the converted high-order QAM signals, especially in presence of nonlinear phase noise such as self-phase modulation (SPM). We experimentally demonstrate an AOWC of 64QAM signal through four-wave mixing (FWM) in highly-nonlinear (HNLF). The performance of the AOWC is optimized through the constellation monitoring of the converted signal, achieving a negligible power penalty (<0.3dB at BER of 10−3) for 60-Gbps 64QAM after conversion.

© 2013 Optical Society of America

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  1. W. Peng, H. Takahashi, T. Tsuritani, and I. Morita, “DAC-free generation and 320-km transmission of 11.2-GBd PDM-64QAM using a single I/Q modulator,” in European Conference and Exhibition on Optical Communication, OSA Technical Digest (online) (Optical Society of America, 2012), paper We.1.C.3.
    [CrossRef]
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2013 (2)

2012 (1)

2010 (1)

2008 (1)

Alic, N.

Barros, D. J. F.

Chi, N.

Dong, Z.

Filion, B.

Ip, E.

Kahn, J. M.

Kawanishi, T.

Larochelle, S.

Lau, A. P. T.

Li, X.

Lu, G.-W.

Moro, S.

Ng, W. C.

Nguyen, A. T.

Peric, A.

Radic, S.

Rusch, L. A.

Sakamoto, T.

Stossel, B.

Yu, J.

Opt. Express (5)

Other (8)

R. Elschner and L. Petermann, “Impact of pump-induced nonlinear phase noise on parametric amplification and wavelength conversion of phase-modulated signals,” in European Conference in Optical Communications (2009), paper 3.3.4.

M. Sköld, M. Karlsson, S. Oda, H. Sunnerud, and P. A. Andrekson, “Constellation measurements of induced phase noise in a regenerating parametric amplifier,” in Optical Fiber Communication Conference/National Fiber Optic Engineers Conference, OSA Technical Digest (CD) (Optical Society of America, 2008), paper OML4.
[CrossRef]

A. H. Gnauck, E. Myslivets, M. Dinu, B. P. P. Kuo, P. Winzer, R. Jopson, N. Alic, A. Konczykowska, F. Jorge, J. Dupuy, and S. Radic, “All-optical tunable wavelength shifting of a 128-Gbit/s 64-QAM signal,” in European Conference and Exhibition on Optical Communication, OSA Technical Digest (online) (Optical Society of America, 2012), paper Th.2.F.2.
[CrossRef]

B. Filion, S. Amiralizadeh, A. T. Nguyen, L. A. Rusch, and S. LaRochelle, “Wideband wavelength conversion of 16 Gbaud 16-QAM signals in a semiconductor optical amplifier,” in Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2013, OSA Technical Digest (online) (Optical Society of America, 2013), paper OTh1C.5.
[CrossRef]

G. Contestabile, Y. Yoshida, A. Maruta, and K. Kitayama, “100 nm-bandwidth positive-efficiency wavelength conversion for m-PSK and m-QAM signals in QD-SOA,” in Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2013, OSA Technical Digest (online) (Optical Society of America, 2013), paper OTh1C.6.
[CrossRef]

S. R. Nuccio, Z. Bakhtiari, O. F. Yilmaz, and A. Willner, “λ-conversion of 160-Gbit/s PDM 16-QAM using a single periodically-poled lithium niobate waveguide,” in Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2011, OSA Technical Digest (CD) (Optical Society of America, 2011), paper OWG5.

W. Peng, H. Takahashi, T. Tsuritani, and I. Morita, “DAC-free generation and 320-km transmission of 11.2-GBd PDM-64QAM using a single I/Q modulator,” in European Conference and Exhibition on Optical Communication, OSA Technical Digest (online) (Optical Society of America, 2012), paper We.1.C.3.
[CrossRef]

A. Sano, T. Kobayashi, A. Matsuura, S. Yamamoto, S. Yamanaka, E. Yoshida, Y. Miyamoto, M. Matsui, M. Mizoguchi, and T. Mizuno, “100x120-Gb/s PDM 64-QAM transmission over 160 km using linewidth-tolerant pilotless digital coherent detection,” in European Conference in Optical Communications (2010), paper PD2_4.

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Figures (7)

Fig. 1
Fig. 1

Experimental setup.

Fig. 2
Fig. 2

(a) Measured BERs and EVMs at the received OSNR of around 25 dB and (b) corresponding conversion efficiencies when tuning the probe power from 7 to 15 dBm and fixing the pump power at 20 dBm.

Fig. 3
Fig. 3

Measured corresponding constellations of the converted signals with different launched probe power: (a) 7 dBm, (b) 9.2 dBm, (c) 12.4 dBm, and (d) 14.8 dBm.

Fig. 4
Fig. 4

(a) Measured EVMs (triangles) and BERs (squares) and (b) corresponding conversion efficiencies with different launched pump power.

Fig. 5
Fig. 5

Measured constellations with pump power of (a) 21.6dBm and (b) 22dBm and (c) 22.3dBm.

Fig. 6
Fig. 6

Measured optical spectrum after HNLF.

Fig. 7
Fig. 7

Measured BER results of input (blue squares) and converted (red triangles) 64QAM signals as a function of OSNR (at 0.1nm) with the theoretical BER curve of 64QAM provided as reference (solid line). Insets: the constellations of input (left) and converted (right) signals 64QAMs.

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