Abstract

Fiber nonlinearity limits the use of coherent optical orthogonal frequency division multiplexing (CO-OFDM) to upgrade wavelength-division multiplexing (WDM) systems using legacy non-return-to-zero-on-off-keying (NRZ-OOK) channels. This letter proposes to compensate for the fiber nonlinearity of CO-OFDM with NRZ-OOK neighbors by combining digital signal processing (DSP)-based self-phase modulation (SPM) post-compensation with pilot-tone-based cross-phase modulation (XPM) compensation. The simulation results demonstrate that the optimum low-pass filter bandwidth for pilot-tone-based XPM compensation depends on the pilot-to-signal ratio value and launch optical power. Our method allows a 4-dB increase in the launch power for a 40-Gb/s single polarization CO-OFDM channel placed in the middle of six 10.7-Gb/s NRZ channels in a 50-GHz space and 1 200-km WDM system.

© 2012 Chinese Optics Letters

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2012 (1)

2011 (2)

2010 (1)

2008 (2)

2007 (3)

Armstrong, J.

Du, L. B.

Hao, Y.

Huang, W.

Jansen, S. L.

Ji, Y.

Kumar, S.

Li, L.

Li, Y.

Lowery, A. J.

Ma, Y.

Morita, I.

Qiao, Y.

Schenk, T. C. W.

Shieh, W.

W. Shieh, X. Yi, Y. Ma, and Y. Tang, Opt. Express 15, 9936 (2007).

W. Shieh, IEEE Photon. Technol. Lett. 19, 134 (2007).

Takeda, N.

Tanaka, H.

Tang, Y.

Wang, R.

Yi, X.

Zhu, X.

Chin. Opt. Lett. (2)

IEEE Photon. Technol. Lett. (1)

W. Shieh, IEEE Photon. Technol. Lett. 19, 134 (2007).

J. Lightwave Technol. (2)

Opt. Express (3)

Opt. Lett. (1)

Other (6)

K. Forozesh, S. L. Jansen, S. Randel, I. Morita, and H. Tanaka, in Proceedings of IEEE/LEOS Summer Topical Meetings 2008 135 (2008).

H. Chen, L. B. Du, and J. Armstrong, in Proceedings of OECC/ACOFT 2008 1 (2008).

L. B. Du and A. J. Lowery, in Proceedings of OFC 2010 OTuE7 (2010).

X. Chen, X. Liu, S. Chandrasekhar, B. Zhu, and R. W. Tkach, in Proceedings of OFC 2012 OTh3C.1 (2012).

B. Inan, S. Randel, S. L. Jansen, A. Lobato, S. Adhikari, and N. Hanik, in Proceedings of ECOC2010 Tu.4.A.6 (2010).

L. B. Du and A. J. Lowery, in Proceedings of ECOC 2011 Th.11.B.4 (2011).

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