Modulation instability induced by cross-phase modulation in a dual-wavelength dispersion-managed soliton fiber ring laser |
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Authors: | Z-C Luo A-P Luo W-C Xu J-R Liu H-S Yin |
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Institution: | 1. Key Laboratory of Photonic Information Technology of Guangdong Higher Education Institutes, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou, Guangdong, 510006, P.R. China
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Abstract: | We report on the observation of the modulation instability induced by cross-phase modulation in a dual-wavelength operation
dispersion-managed soliton fiber ring laser with net negative cavity dispersion. The passively mode-locked operation is achieved
by using a nonlinear polarization rotation technique. A new type of dual-wavelength operation, where one is femtosecond pulse
and the other is picosecond pulse operation, is obtained by properly rotating the polarization controllers. When the dual-wavelength
pulses are simultaneously circulating in the laser ring cavity, a series of stable modulation sidebands appears in the picosecond
pulse spectrum at longer wavelength with lower peak power due to modulation instability induced by cross-phase modulation
between the two lasing wavelengths. Moreover, the intensities and wavelength shifts of the modulation sidebands can be tuned
by varying the power of the femtosecond pulse or the lasing central wavelengths of the dual-wavelength pulses. The theoretical
analysis of the modulation instability induced by cross-phase modulation in our fiber laser is also presented. |
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