Abstract

We report the performance of coherently-detected nine-channel WDM transmission over high dispersion fibers, using polarization multiplexed m-ary quadrature amplitude modulation (m = 4, 16, 64, 256) at 112 Gbit/s. Compensation of fiber nonlinearities via digital back-propagation enables up to 10 dB improvement in maximum transmittable power and ~8 dB Qeff improvement which translates to a nine-fold enhancement in transmission reach for PM-256QAM, where the largest improvements are associated with higher-order modulation formats. We further demonstrate that even under strong nonlinear distortion the transmission reach only reduces by a factor of ~2.5 for a 2 unit increase in capacity (log2m) when full band DBP is employed, in proportion to the required back-to-back OSNR.

©2011 Optical Society of America

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References

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  1. A. D. Ellis, J. Zhao, and D. Cotter, “Approaching the Non-Linear Shannon Limit,” J. Lightwave Technol. 28(4), 423–433 (2010).
    [Crossref]
  2. R.-J. Essiambre, G. Kramer, P. J. Winzer, G. J. Foschini, and B. Goebel, “Capacity Limits of Optical Fiber Networks,” J. Lightwave Technol. 28(4), 662–701 (2010).
    [Crossref]
  3. S. Makovejsm, D. S. Millar, V. Mikhailov, G. Gavioli, R. I. Killey, S. J. Savory, and P. Bayvel, “Experimental Investigation of PDMQAM16 Transmission at 112 Gbit/s over 2400 km,” Optical Fiber Communication Conference, OFC 2010, OMJ6, (2010).
  4. J. Yu, X. Zhou, Y. Huang, S. Gupta, M. Huang, T. Wang, and P. Magill, “112.8-Gb/s PM-RZ 64QAM Optical Signal Generation and Transmission on a 12.5GHz WDM Grid,” Optical Fiber Communication Conference, OFC 2010, OThM1, (2010).
  5. M. Nakazawa, S. Okamoto, T. Omiya, K. Kasai, and M. Yoshida, “256 QAM (64 Gbit/s) Coherent Optical Transmission over 160 km with an Optical Bandwidth of 5.4 GHz,” Optical Fiber Communication Conference, OFC 2010, OThD5, (2010).
  6. S. J. Savory, “Compensation of fiber impairments in digital coherent systems,” Optical Communication, 2008. ECOC 2008. 34th European Conference on, Mo.3.D.1, (2008).
  7. E. Ip, “Nonlinear Compensation Using Backpropagation for Polarization-Multiplexed Transmission,” J. Lightwave Technol. 28(6), 939–951 (2010).
    [Crossref]
  8. E. Mateo, L. Zhu, and G. Li, “Impact of XPM and FWM on the digital implementation of impairment compensation for WDM transmission using backward propagation,” Opt. Express 16(20), 16124–16137 (2008).
    [Crossref] [PubMed]
  9. D. Rafique, J. Zhao, and A.D. Ellis, “Impact of Dispersion Map Management on the Performance of Back-Propagation for Nonlinear WDM Transmissions,” OECC, 00107, (2010).
  10. S. Oda, T. Tanimura, T. Hoshida, C. Ohshima, H. Nakashima, Z. Tao, and J. C. Rasmussen, “112 Gb/s DP-QPSK transmission using a novel nonlinear compensator in digital coherent receiver,” Optical Fiber Communication Conference, OFC 2009, OThR6, (2009).
  11. D. Rafique and A. D. Ellis, “Impact of signal-ASE four-wave mixing on the effectiveness of digital back-propagation in 112 Gb/s PM-QPSK systems,” Opt. Express (accepted for publication).
    [PubMed]
  12. L. B. Du and A. J. Lowery, “Improved single channel backpropagation for intra-channel fiber nonlinearity compensation in long-haul optical communication systems,” Opt. Express 18(16), 17075–17088 (2010).
    [Crossref] [PubMed]
  13. D. Rafique, J. Zhao, and A. D. Ellis, “Performance Improvement by Fiber Nonlinearity Compensation in 112 Gb/s PM M-ary QAM,” OFC (accepted for publication).

2010 (4)

2008 (1)

Cotter, D.

Du, L. B.

Ellis, A. D.

A. D. Ellis, J. Zhao, and D. Cotter, “Approaching the Non-Linear Shannon Limit,” J. Lightwave Technol. 28(4), 423–433 (2010).
[Crossref]

D. Rafique and A. D. Ellis, “Impact of signal-ASE four-wave mixing on the effectiveness of digital back-propagation in 112 Gb/s PM-QPSK systems,” Opt. Express (accepted for publication).
[PubMed]

Essiambre, R.-J.

Foschini, G. J.

Goebel, B.

Ip, E.

Kramer, G.

Li, G.

Lowery, A. J.

Mateo, E.

Rafique, D.

D. Rafique and A. D. Ellis, “Impact of signal-ASE four-wave mixing on the effectiveness of digital back-propagation in 112 Gb/s PM-QPSK systems,” Opt. Express (accepted for publication).
[PubMed]

Winzer, P. J.

Zhao, J.

Zhu, L.

J. Lightwave Technol. (3)

Opt. Express (3)

Other (7)

D. Rafique, J. Zhao, and A. D. Ellis, “Performance Improvement by Fiber Nonlinearity Compensation in 112 Gb/s PM M-ary QAM,” OFC (accepted for publication).

S. Makovejsm, D. S. Millar, V. Mikhailov, G. Gavioli, R. I. Killey, S. J. Savory, and P. Bayvel, “Experimental Investigation of PDMQAM16 Transmission at 112 Gbit/s over 2400 km,” Optical Fiber Communication Conference, OFC 2010, OMJ6, (2010).

J. Yu, X. Zhou, Y. Huang, S. Gupta, M. Huang, T. Wang, and P. Magill, “112.8-Gb/s PM-RZ 64QAM Optical Signal Generation and Transmission on a 12.5GHz WDM Grid,” Optical Fiber Communication Conference, OFC 2010, OThM1, (2010).

M. Nakazawa, S. Okamoto, T. Omiya, K. Kasai, and M. Yoshida, “256 QAM (64 Gbit/s) Coherent Optical Transmission over 160 km with an Optical Bandwidth of 5.4 GHz,” Optical Fiber Communication Conference, OFC 2010, OThD5, (2010).

S. J. Savory, “Compensation of fiber impairments in digital coherent systems,” Optical Communication, 2008. ECOC 2008. 34th European Conference on, Mo.3.D.1, (2008).

D. Rafique, J. Zhao, and A.D. Ellis, “Impact of Dispersion Map Management on the Performance of Back-Propagation for Nonlinear WDM Transmissions,” OECC, 00107, (2010).

S. Oda, T. Tanimura, T. Hoshida, C. Ohshima, H. Nakashima, Z. Tao, and J. C. Rasmussen, “112 Gb/s DP-QPSK transmission using a novel nonlinear compensator in digital coherent receiver,” Optical Fiber Communication Conference, OFC 2009, OThR6, (2009).

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Figures (6)

Fig. 1
Fig. 1 Simulation setup for 112 Gbit/s PM-mQAM (m = 4, 16, 64, 256) WDM transmission system with N transmitters and M spans. PBS: Polarization beam splitter, ADC: Analogue to digital converter.

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Fig. 2
Fig. 2 Qeff as a function of launch power per channel per span for112 Gbit/s PM-256QAM after 960 km. EDC only (stars), SC DBP (triangles), full band DBP (squares).

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Fig. 3
Fig. 3 Constellation maps after full band DBP (top) and EDC (bottom) for nine-channel WDM 112 Gbit/s PM-mQAM (m = 4, 16, 64, 256), NLT at BER of 10−3 after full band DBP in all the cases. a) PM-4QAM after 17,200 km, b) a) PM-16QAM after 6,640 km, C) a) PM-64QAM after 2,640 km, d) a) PM-256QAM after 960 km.

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Fig. 4
Fig. 4 Qeff as a function of transmission distance for 112 Gbit/s PM-mQAM for single channel (triangles) and nine channel WDM (squares) transmission. m = 4(red), 16(green), 64(blue), and 256(purple). EDC (open), SC DBP (half filled), and full band DBP (solid).

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Fig. 5
Fig. 5 a) Required OSNR at the NLT for maximum transmission reach achieving a BER of 10−3, linear theory (pink line), data after full band DBP (red triangles: WDM, blue circles: single-channel), b) Maximum transmission distance at the NLT achieving a BER of 10−3 for a WDM system. EDC (triangle), SC DBP (circle), full band DBP (square)

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Fig. 6
Fig. 6 Qeff (a) and NLT (b), for EDC (circles), SC DBP (squares), and full band DBP (triangles) for PM-mQAM at transmission distances giving 9.79 dB Qeff after full band DBP. (960 km (256QAM), 2,640 km (64QAM), 6,640 km (16QAM), and 17,200 km (4QAM)).

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Tables (1)

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Table 1 Simulation parameters

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