Abstract

We experimentally generate 28-GBd 6-ary polarization-shift keying quadrature phase-shift keying (6PolSK-QPSK) signals by utilizing a high-speed 4-channel digital-to-analog converter and an integrated dual-polarization I/Q modulator. In WDM transmission experiments over up to 4800 km standard single-mode fiber, we compare the performance of 126-Gb/s 6PolSK-QPSK and 112-Gb/s polarization-division multiplexing (PDM) QPSK signals. Furthermore, we discuss the implications of applying an inner Reed-Solomon RS(511,455) forward error correction code in order to correct burst errors due to the anti-Gray mapping of 6PolSK-QPSK.

© 2012 OSA

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References

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  1. M. Sjödin, P. Johannisson, H. Wymeersch, P. A. Andrekson, and M. Karlsson, “Comparison of polarization-switched QPSK and polarization-multiplexed QPSK at 30 Gbit/s,” Opt. Express19(8), 7839–7846 (2011).
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  2. E. Agrell and M. Karlsson, “Power-efficient modulation formats in coherent transmission systems,” J. Lightwave Technol.27(22), 5115–5126 (2009).
    [CrossRef]
  3. J. K. Fischer, L. Molle, M. Nölle, D.-D. Groß, C. Schmidt-Langhorst, and C. Schubert, “Experimental investigation of 84-Gb/s and 112-Gb/s polarization-switched quadrature phase-shift keying signals,” Opt. Express19(26), B667–B672 (2011).
    [CrossRef] [PubMed]
  4. D. S. Millar, D. Lavery, S. Makovejs, C. Behrens, B. C. Thomsen, P. Bayvel, and S. J. Savory, “Generation and long-haul transmission of polarization-switched QPSK at 42.9 Gb/s,” Opt. Express19(10), 9296–9302 (2011).
    [CrossRef] [PubMed]
  5. M. Nölle, J. K. Fischer, L. Molle, C. Schmidt-Langhorst, D. Peckham, and C. Schubert, “Comparison of 8 × 112 Gb/s PS-QPSK and PDM-QPSK signals over transoceanic distances,” Opt. Express19(24), 24370–24375 (2011).
    [CrossRef] [PubMed]
  6. B. Krongold, T. Pfau, N. Kaneda, and S. C. J. Lee, “Comparison between PS-QPSK and PDM-QPSK with equal rate and bandwidth,” IEEE Photon. Technol. Lett.24(3), 203–205 (2012).
    [CrossRef]
  7. H. Bülow, “Ideal POL-QAM modulation for coherent detection schemes,” in Proc. Signal Processing in Photonic Communications (2011), paper SPTuB1.
  8. J. Renaudier, P. Serena, A. Bononi, M. Salsi, O. Bertran-Pardo, H. Mardoyan, P. Tran, E. Dutisseuil, G. Charlet, and S. Bigo, “Generation and detection of 28 Gbaud polarization switched-QPSK in WDM long-haul systems,” J. Lightwave Technol.30(9), 1312–1318 (2012).
    [CrossRef]
  9. H. Bülow, “Polarization QAM modulation (POL-QAM) for coherent detection schemes,” in Proc. Opt. Fiber Commun. Conf. (2009), paper OWG2.
  10. H. Bülow and E. Masalkina, Coded modulation in optical communications,” in Proc. Opt. Fiber Commun. Conf. (2011), paper OThO1.
  11. J. K. Fischer, S. Alreesh, R. Elschner, F. Frey, C. Meuer, L. Molle, C. Schmidt-Langhorst, T. Tanimura, and C. Schubert, “Experimental investigation of 126-Gb/s 6PolSK-QPSK signals,” Proc. Eur. Conf. Opt. Commun. (2012), paper We.1.C.4.
  12. F. Buchali and H. Bülow, “Experimental transmission with POLQAM and PS-QPSK modulation format using a 28-Gbaud 4-D transmitter,” Proc. Eur. Conf. Opt. Commun. (2012), paper We.3.A.1.
  13. F. Pittalà, F. N. Hauske, Y. Ye, N. G. Gonzalez, and I. T. Monroy, Data-aided frequency-domain 2 × 2 MIMO equalizer for 112 Gbit/s PDM-QPSK coherent transmission systems,” in Proc. Opt. Fiber Commun. Conf. (2012), paper OM2H.4.
  14. K. Shi and E. Serpedin, “Coarse frame and carrier synchronization of OFDM systems: a new metric and comparison,” IEEE Trans. Wirel. Comm.3(4), 1271–1284 (2004).
    [CrossRef]

2012

2011

2009

2004

K. Shi and E. Serpedin, “Coarse frame and carrier synchronization of OFDM systems: a new metric and comparison,” IEEE Trans. Wirel. Comm.3(4), 1271–1284 (2004).
[CrossRef]

Agrell, E.

Andrekson, P. A.

Bayvel, P.

Behrens, C.

Bertran-Pardo, O.

Bigo, S.

Bononi, A.

Charlet, G.

Dutisseuil, E.

Fischer, J. K.

Groß, D.-D.

Johannisson, P.

Kaneda, N.

B. Krongold, T. Pfau, N. Kaneda, and S. C. J. Lee, “Comparison between PS-QPSK and PDM-QPSK with equal rate and bandwidth,” IEEE Photon. Technol. Lett.24(3), 203–205 (2012).
[CrossRef]

Karlsson, M.

Krongold, B.

B. Krongold, T. Pfau, N. Kaneda, and S. C. J. Lee, “Comparison between PS-QPSK and PDM-QPSK with equal rate and bandwidth,” IEEE Photon. Technol. Lett.24(3), 203–205 (2012).
[CrossRef]

Lavery, D.

Lee, S. C. J.

B. Krongold, T. Pfau, N. Kaneda, and S. C. J. Lee, “Comparison between PS-QPSK and PDM-QPSK with equal rate and bandwidth,” IEEE Photon. Technol. Lett.24(3), 203–205 (2012).
[CrossRef]

Makovejs, S.

Mardoyan, H.

Millar, D. S.

Molle, L.

Nölle, M.

Peckham, D.

Pfau, T.

B. Krongold, T. Pfau, N. Kaneda, and S. C. J. Lee, “Comparison between PS-QPSK and PDM-QPSK with equal rate and bandwidth,” IEEE Photon. Technol. Lett.24(3), 203–205 (2012).
[CrossRef]

Renaudier, J.

Salsi, M.

Savory, S. J.

Schmidt-Langhorst, C.

Schubert, C.

Serena, P.

Serpedin, E.

K. Shi and E. Serpedin, “Coarse frame and carrier synchronization of OFDM systems: a new metric and comparison,” IEEE Trans. Wirel. Comm.3(4), 1271–1284 (2004).
[CrossRef]

Shi, K.

K. Shi and E. Serpedin, “Coarse frame and carrier synchronization of OFDM systems: a new metric and comparison,” IEEE Trans. Wirel. Comm.3(4), 1271–1284 (2004).
[CrossRef]

Sjödin, M.

Thomsen, B. C.

Tran, P.

Wymeersch, H.

IEEE Photon. Technol. Lett.

B. Krongold, T. Pfau, N. Kaneda, and S. C. J. Lee, “Comparison between PS-QPSK and PDM-QPSK with equal rate and bandwidth,” IEEE Photon. Technol. Lett.24(3), 203–205 (2012).
[CrossRef]

IEEE Trans. Wirel. Comm.

K. Shi and E. Serpedin, “Coarse frame and carrier synchronization of OFDM systems: a new metric and comparison,” IEEE Trans. Wirel. Comm.3(4), 1271–1284 (2004).
[CrossRef]

J. Lightwave Technol.

Opt. Express

Other

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

H. Bülow and E. Masalkina, Coded modulation in optical communications,” in Proc. Opt. Fiber Commun. Conf. (2011), paper OThO1.

J. K. Fischer, S. Alreesh, R. Elschner, F. Frey, C. Meuer, L. Molle, C. Schmidt-Langhorst, T. Tanimura, and C. Schubert, “Experimental investigation of 126-Gb/s 6PolSK-QPSK signals,” Proc. Eur. Conf. Opt. Commun. (2012), paper We.1.C.4.

F. Buchali and H. Bülow, “Experimental transmission with POLQAM and PS-QPSK modulation format using a 28-Gbaud 4-D transmitter,” Proc. Eur. Conf. Opt. Commun. (2012), paper We.3.A.1.

F. Pittalà, F. N. Hauske, Y. Ye, N. G. Gonzalez, and I. T. Monroy, Data-aided frequency-domain 2 × 2 MIMO equalizer for 112 Gbit/s PDM-QPSK coherent transmission systems,” in Proc. Opt. Fiber Commun. Conf. (2012), paper OM2H.4.

H. Bülow, “Ideal POL-QAM modulation for coherent detection schemes,” in Proc. Signal Processing in Photonic Communications (2011), paper SPTuB1.

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Figures (5)

Fig. 1
Fig. 1

Experimental setup for the generation of 20 × 112-Gb/s PDM-QPSK and 20 × 126-Gb/s 6PolSK-QPSK signals. (a) Optical envelope before ILV (top) and electrical drive signal (bottom) for 126-Gb/s 6PolSK-QPSK, (b) optical envelope before ILV (top) and electrical drive signal (bottom) for 112-Gb/s PDM-QPSK and (c) spectrum of the 20 × 126 Gb/s 6PolSK-QPSK WDM signal.

Fig. 2
Fig. 2

(a) Back-to-back time-resolved SOP (~105 symbols) and (b) corresponding constellation diagram of 126-Gb/s 6PolSK-QPSK at maximum OSNR (~5 × 106 symbols).

Fig. 3
Fig. 3

Measured back-to-back Q-factor for 112-Gb/s PDM-QPSK (squares), 126-Gb/s 6PolSK-QPSK (circles) and 112-Gb/s 6PolSK-QPSK with inner RS (511,455) (triangles). The solid lines show the theoretical Q-factor for an AWGN channel [2].

Fig. 4
Fig. 4

Q-factor versus (a) transmitted distance for −2 dBm launch power per channel and (b) launch power per channel after 2400 km.

Fig. 5
Fig. 5

The block diagram of 6PolSK-QPSK encoder with two levels of coding [9].

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