Abstract

We performed long-haul WDM transmission experiments to compare 10 Gbit/s MSK and QPSK modulation with a channel grid of 12.5 GHz. A standard link setup with inline dispersion compensation was applied in combination with coherent detection and following offline signal processing. Both modulation formats showed nearly equal performance bridging about 4000 km at a BER of 10−3.

© 2012 OSA

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References

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  1. M. Rohde, R. Freund, C. Caspar, A. Hachmeister, and M. Gruner, “Long haul transmission of optical minimum shift keying format,“ in Proc. Eur. Conf. of Optical Comm, Sept. 2008, paper Mo.4.E.4.
  2. A. Hachmeister, M. Rohde, and R. Freund, “Long haul transmission of optical minimum shift keying format with narrow channel spacing,” in Proc. Asia Comm. and Phot. Conf., Nov. 2009, paper ThT6.
  3. M. Seimetz, “Digital phase estimation,” in High-Order Modulation for Optical Fiber Transmission (Springer, 2009), 99–111.
  4. F. Xiong, Digital Modulation Techniques (Artech House, 2006).
  5. K.-P. Ho and J. M. Kahn, “Electronic compensation technique to mitigate nonlinear phase noise,” J. Lightwave Technol. 22(3), 779–783 (2004).
    [CrossRef]
  6. R. A. Griffin and A. C. Carter, “Optical differential quadrature phase shift key (oDQPSK) for high capacity optical transmission,” in Proc. Optical Fiber Comm. Conf., Mar. 2002, paper WX6.
  7. T. Sakamoto, G. W. Lu, A. Chiba, T. Kawanishi, and T. Miyazaki, “Coherent demodulation of 10-Gb/s optical minimum shift keying,” in Proc. Opticl. Fiber Comm. Conf., Mar. 2010, paper JThA2.
  8. G. W. Lu, T. Sakamoto, A. Chiba, T. Kawanishi, T. Miyazaki, K. Higuma, and J. Ichikawa, “80-Gb/s optical MSK generation using a monolithically integrated quad Mach-Zehnder IQ modulator,” in Proc. Optical Fiber Comm. Conf., Mar. 2010, paper OWN5.

2004 (1)

J. Lightwave Technol. (1)

Other (7)

R. A. Griffin and A. C. Carter, “Optical differential quadrature phase shift key (oDQPSK) for high capacity optical transmission,” in Proc. Optical Fiber Comm. Conf., Mar. 2002, paper WX6.

T. Sakamoto, G. W. Lu, A. Chiba, T. Kawanishi, and T. Miyazaki, “Coherent demodulation of 10-Gb/s optical minimum shift keying,” in Proc. Opticl. Fiber Comm. Conf., Mar. 2010, paper JThA2.

G. W. Lu, T. Sakamoto, A. Chiba, T. Kawanishi, T. Miyazaki, K. Higuma, and J. Ichikawa, “80-Gb/s optical MSK generation using a monolithically integrated quad Mach-Zehnder IQ modulator,” in Proc. Optical Fiber Comm. Conf., Mar. 2010, paper OWN5.

M. Rohde, R. Freund, C. Caspar, A. Hachmeister, and M. Gruner, “Long haul transmission of optical minimum shift keying format,“ in Proc. Eur. Conf. of Optical Comm, Sept. 2008, paper Mo.4.E.4.

A. Hachmeister, M. Rohde, and R. Freund, “Long haul transmission of optical minimum shift keying format with narrow channel spacing,” in Proc. Asia Comm. and Phot. Conf., Nov. 2009, paper ThT6.

M. Seimetz, “Digital phase estimation,” in High-Order Modulation for Optical Fiber Transmission (Springer, 2009), 99–111.

F. Xiong, Digital Modulation Techniques (Artech House, 2006).

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Figures (6)

Fig. 1
Fig. 1

5 GBaud MSK and QPSK in the frequency domain. The dotted rectangle represents the 12.5 GHz channel.

Fig. 2
Fig. 2

Experimental setup of 5 GBaud MSK resp. QPSK six channel WDM transmission.

Fig. 3
Fig. 3

left: Power transfer function of the 12.5 GHz interleaver, right: Electrical inphase and quadrature driving signals (X: 50ps/div; Y: 2.5V/div) (upper diagrams) and optical WDM spectrum with 12.5 GHz channel spacing (X: 0.1nm/div; Y: 10 dB/div) (bottom diagrams) for MSK and QPSK.

Fig. 4
Fig. 4

left: Back-to-back results for experiment (QPSK represents single + WDM) and simulation (dashed lines; for WDM only), right: Constellation plots for MSK and QPSK, OSNR ~4 dB in case of WDM, red circles represent error symbols.

Fig. 5
Fig. 5

left: BER vs. transmission distance for 6 channel 12.5 GHz spaced WDM QPSK, and MSK (solid lines without, dashed lines with compensation of nonlinearities), right: Constellation plots for MSK and QPSK for a distance of 4000 km (OSNR ~6.5 dB for both modulation formats) without the compensation of nonlinearities, red circles represent error symbols.

Fig. 6
Fig. 6

Measured error performance vs. SSMF launch power per channel at a DCF launch power of −13 dBm per channel for QPSK with 6 channel WDM at 12.5 GHz channel spacing

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