We report on the first experimental observation of dual wavelength domain wall type of dark solitons in a fiber laser made of all normal group velocity dispersion fibers. It was shown that this solitary wave is formed due to the cross coupling between two different wavelength laser beams and consists of localized dip structures separating the two different wavelength laser emissions.

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1. P. Emplit, J. P. Hamaide, F. Reynaud, and A. Barthelemy, “Picosecond steps and dark pulses through nonlinear single mode fibers,” Opt. Commun. 62(6), 374–379 (1987). [CrossRef]
2. A. M. Weiner, J. P. Heritage, R. J. Hawkins, R. N. Thurston, E. M. Kirschner, D. E. Leaird, and W. J. Tomlinson, “Experimental observation of the fundamental dark soliton in optical fibers,” Phys. Rev. Lett. 61(21), 2445–2448 (1988). [CrossRef] [PubMed]
3. Y. S. Kivshar and S. K. Turitsyn, “Vector dark solitons,” Opt. Lett. 18(5), 337–339 (1993). [CrossRef] [PubMed]
4. I. N. Iii, “All-fiber ring soliton laser mode locked with a nonlinear mirror,” Opt. Lett. 16(8), 539–541 (1991). [CrossRef] [PubMed]
5. T. Sylvestre, S. Coen, P. Emplit, and M. Haelterman, “Self-induced modulational instability laser revisited: normal dispersion and dark-pulse train generation,” Opt. Lett. 27(7), 482–484 (2002). [CrossRef]
6. H. Zhang, D. Y. Tang, L. M. Zhao, and X. Wu, “Dark pulse emission of a fiber laser,” Phys. Rev. A 80(4), 045803 (2009). [CrossRef]
7. H. Zhang, D. Y. Tang, L. M. Zhao, and R. J. Knize, “Vector dark domain wall solitons in a fiber ring laser,” Opt. Express 18(5), 4428–4433 (2010). [CrossRef] [PubMed]
8. M. Haelterman and A. P. Sheppard, “Polarization domain walls in diffractive or dispersive Kerr media,” Opt. Lett. 19(2), 96–98 (1994). [CrossRef] [PubMed]
9. B. A. Malomed, “Optical domain walls,” Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics 50(2), 1565–1571 (1994). [CrossRef] [PubMed]
10. S. Pitois, G. Millot, and S. Wabnitz, “Polarization domain wall solitons with counter propagating laser beams,” Phys. Rev. Lett. 81(7), 1409–1412 (1998). [CrossRef]
11. M. Haelterman and M. Badolo, “Dual-frequency wall solitary waves for nonreturn-to-zero signal transmission in W-type single-mode fibers,” Opt. Lett. 20(22), 2285–2287 (1995). [CrossRef] [PubMed]
12. P. L. Boudec, C. Jaouen, P. L. François, J.-F. Bayon, F. Sanchez, P. Besnard, and G. Stéphan, “Antiphase dynamics and chaos in self-pulsing erbium-doped fiber lasers,” Opt. Lett. 18(22), 1890–1892 (1993). [CrossRef] [PubMed]
13. S. Coen and T. Sylvestre, “Comment on ‘Dark pulse emission of a fiber laser’,” Phys. Rev. A 82(4), 047801 (2010). [CrossRef]
14. D. Y. Tang, H. Zhang, L. M. Zhao, and X. Wu, “Observation of high-order polarization-locked vector solitons in a fiber laser,” Phys. Rev. Lett. 101(15), 153904 (2008). [CrossRef] [PubMed]
15. C. Milián, D. V. Skryabin, and A. Ferrando, “Continuum generation by dark solitons,” Opt. Lett. 34(14), 2096–2098 (2009). [CrossRef] [PubMed]

Opt. Commun.

• P. Emplit, J. P. Hamaide, F. Reynaud, and A. Barthelemy, “Picosecond steps and dark pulses through nonlinear single mode fibers,” Opt. Commun. 62(6), 374–379 (1987). [CrossRef]

Opt. Express

• H. Zhang, D. Y. Tang, L. M. Zhao, and R. J. Knize, “Vector dark domain wall solitons in a fiber ring laser,” Opt. Express 18(5), 4428–4433 (2010). [CrossRef] [PubMed]

Opt. Lett.

• M. Haelterman and A. P. Sheppard, “Polarization domain walls in diffractive or dispersive Kerr media,” Opt. Lett. 19(2), 96–98 (1994). [CrossRef] [PubMed]
• Y. S. Kivshar and S. K. Turitsyn, “Vector dark solitons,” Opt. Lett. 18(5), 337–339 (1993). [CrossRef] [PubMed]
• I. N. Iii, “All-fiber ring soliton laser mode locked with a nonlinear mirror,” Opt. Lett. 16(8), 539–541 (1991). [CrossRef] [PubMed]
• T. Sylvestre, S. Coen, P. Emplit, and M. Haelterman, “Self-induced modulational instability laser revisited: normal dispersion and dark-pulse train generation,” Opt. Lett. 27(7), 482–484 (2002). [CrossRef]
• C. Milián, D. V. Skryabin, and A. Ferrando, “Continuum generation by dark solitons,” Opt. Lett. 34(14), 2096–2098 (2009). [CrossRef] [PubMed]
• M. Haelterman and M. Badolo, “Dual-frequency wall solitary waves for nonreturn-to-zero signal transmission in W-type single-mode fibers,” Opt. Lett. 20(22), 2285–2287 (1995). [CrossRef] [PubMed]
• P. L. Boudec, C. Jaouen, P. L. François, J.-F. Bayon, F. Sanchez, P. Besnard, and G. Stéphan, “Antiphase dynamics and chaos in self-pulsing erbium-doped fiber lasers,” Opt. Lett. 18(22), 1890–1892 (1993). [CrossRef] [PubMed]

Phys. Rev. A

• S. Coen and T. Sylvestre, “Comment on ‘Dark pulse emission of a fiber laser’,” Phys. Rev. A 82(4), 047801 (2010). [CrossRef]
• H. Zhang, D. Y. Tang, L. M. Zhao, and X. Wu, “Dark pulse emission of a fiber laser,” Phys. Rev. A 80(4), 045803 (2009). [CrossRef]

Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics

• B. A. Malomed, “Optical domain walls,” Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics 50(2), 1565–1571 (1994). [CrossRef] [PubMed]

Phys. Rev. Lett.

• S. Pitois, G. Millot, and S. Wabnitz, “Polarization domain wall solitons with counter propagating laser beams,” Phys. Rev. Lett. 81(7), 1409–1412 (1998). [CrossRef]
• D. Y. Tang, H. Zhang, L. M. Zhao, and X. Wu, “Observation of high-order polarization-locked vector solitons in a fiber laser,” Phys. Rev. Lett. 101(15), 153904 (2008). [CrossRef] [PubMed]
• A. M. Weiner, J. P. Heritage, R. J. Hawkins, R. N. Thurston, E. M. Kirschner, D. E. Leaird, and W. J. Tomlinson, “Experimental observation of the fundamental dark soliton in optical fibers,” Phys. Rev. Lett. 61(21), 2445–2448 (1988). [CrossRef] [PubMed]

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