Abstract

We experimentally investigate 28-GBd (84-Gb/s) and 37.3-GBd (112-Gb/s) polarization-switched quadrature phase-shift keying (PS-QPSK) signals. In single-channel transmission experiments over up to 12500 km ultra large effective area fiber, we compare their performance to that of polarization-division multiplexing quadrature phase-shift keying (PDM-QPSK) signals at the same bit rates. The experimental results show that PS-QPSK not only benefits from its better sensitivity but also offers an increased tolerance to intra-channel nonlinearities.

© 2011 OSA

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References

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2011 (4)

2010 (1)

2009 (2)

2008 (1)

I. Fatadin, S. J. Savory, and D. Ives, “Compensation of quadrature imbalance in an optical QPSK coherent receiver,” IEEE Photon. Technol. Lett. 20(20), 1733–1735 (2008).
[CrossRef]

1995 (1)

M. Wrigth, “Comments on ‘Aspects of MLS measuring systems’,” J. Audio Eng. Soc. 43, 48–49 (1995).

Agrell, E.

Andrekson, P. A.

Bayvel, P.

Behrens, C.

Bosco, G.

Carena, A.

Curri, V.

Ellis, A. D.

Fatadin, I.

I. Fatadin, S. J. Savory, and D. Ives, “Compensation of quadrature imbalance in an optical QPSK coherent receiver,” IEEE Photon. Technol. Lett. 20(20), 1733–1735 (2008).
[CrossRef]

Forghieri, F.

Ives, D.

I. Fatadin, S. J. Savory, and D. Ives, “Compensation of quadrature imbalance in an optical QPSK coherent receiver,” IEEE Photon. Technol. Lett. 20(20), 1733–1735 (2008).
[CrossRef]

Johannisson, P.

Karlsson, M.

Lavery, D.

Mac Suibhne, N.

Magill, P.

Makovejs, S.

Millar, D. S.

Nelson, L. E.

Poggiolini, P.

Savory, S. J.

Sjödin, M.

Thomsen, B. C.

Wrigth, M.

M. Wrigth, “Comments on ‘Aspects of MLS measuring systems’,” J. Audio Eng. Soc. 43, 48–49 (1995).

Wymeersch, H.

Zhou, X.

IEEE Photon. Technol. Lett. (1)

I. Fatadin, S. J. Savory, and D. Ives, “Compensation of quadrature imbalance in an optical QPSK coherent receiver,” IEEE Photon. Technol. Lett. 20(20), 1733–1735 (2008).
[CrossRef]

J. Audio Eng. Soc. (1)

M. Wrigth, “Comments on ‘Aspects of MLS measuring systems’,” J. Audio Eng. Soc. 43, 48–49 (1995).

J. Lightwave Technol. (1)

Opt. Express (6)

Other (6)

M. Selmi, Y. Jaouën, and P. Ciblat, “Accurate digital frequency offset estimator for coherent PolMux QAM transmission systems,” in Proc. 35th Eur. Conf. Opt. Commun. (2009), paper P3.08.

J. Renaudier, O. Bertran-Pardo, H. Mardoyan, M. Salsi, P. Tran, E. Dutisseuil, G. Charlet, and S. Bigo, “Experimental comparison of 28Gbaud polarization switched- and polarization division multiplexed- QPSK in WDM long-haul transmission system,” in Proc. 37th Eur. Conf. Opt. Commun. (2011), paper Mo.2.B.3.

H. Bülow, “Polarization QAM modulation (POL-QAM) for coherent detection schemes,” in Proc. Opt. Fiber Commun. Conf. (2009), paper OWG2.

P. Serena, A. Vannucci, and A. Bononi, “The performance of polarization switched-QPSK (PS-QPSK) in dispersion managed WDM transmission,” in Proc. 36th Eur. Conf. Opt. Commun. (2010), paper Th.10.E.2.

C. Behrens, D. Lavery, D. Millar, S. Makovejs, B. C. Thompson, R. Killey, S. Savory, and P. Bayvel, “Ultra-long-haul transmission of 7×42.9Gbit/s PS-QPSK and PM-BPSK,” in Proc. 37th Eur. Conf. Opt. Commun. (2011), paper Mo.2.B.2.

J. K. Fischer, L. Molle, M. Nölle, D.-D. Groß, and C. Schubert, “Experimental investigation of 28-GBd polarization-switched quadrature phase-shift keying signals,” in Proc. 37th Eur. Conf. Opt. Commun. (2011), paper Mo.2.B.1.

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Figures (3)

Fig. 1
Fig. 1

(a) Experimental setup. The insets show optical eye diagrams of 112-Gb/s PS-QPSK signals before and after the 50-GHz interleaving filter. The acronyms stand for ECL: external cavity laser, BPG: bit-pattern generator, EDFA: erbium-doped fiber amplifier, ILV: interleaver, AO: acousto-optic, EQ: equalizer, VOA: variable optical attenuator, LO: local oscillator, BD: balanced detector. (b), (c), (d), (e) Constellation diagrams as well as plots of the φx / φy phase plane at maximum OSNR for back-to-back 84-Gb/s PDM-QPSK and PS-QPSK signals, respectively. (f) Back-to-back constellation diagram after the 2 × 2 MIMO equalizer adapted with a modified CMA and a decision-directed least mean square algorithm for 112-Gb/s PS-QPSK at maximum OSNR.

Fig. 2
Fig. 2

Back-to-back BER for a bit rate of (a) 84 Gb/s and (b) 112 Gb/s. Solid lines correspond to the theoretical noise-limited BER and symbols denote measured BER values.

Fig. 3
Fig. 3

(a) BER as a function of transmitted distance for a bit rate of 84 Gb/s at a launch power of −1 dBm for PDM-QPSK and + 1 dBm for PS-QPSK. (b) BER as a function of launch power for a bit rate of 112 Gb/s at different transmitted distances.

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