We report the experimental generation of two-soliton molecules in an all-polarization-maintaining ytterbium-doped fiber laser operating in the normal dispersion regime. These molecules exhibit an independently evolving phase and are characterized by a regular spectral modulation pattern with a modulation depth of 80% measured as an averaged value. Moreover, the numerical modeling confirms that the limited modulation depth of the spectrum is caused by the evolution of the phase difference between the pulses.
© 2010 Optical Society of America
Original Manuscript: February 12, 2010
Revised Manuscript: April 1, 2010
Manuscript Accepted: April 6, 2010
Published: May 5, 2010
Bülend Ortaç, Alexandr Zaviyalov, Carsten K. Nielsen, Oleg Egorov, Rumen Iliew, Jens Limpert, Falk Lederer, and Andreas Tünnermann, "Observation of soliton molecules with independently evolving phase in a mode-locked fiber laser," Opt. Lett. 35, 1578-1580 (2010)