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25 October 2006 Nonlinearity enhanced fiber ring laser
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In this paper, we propose and demonstrate a novel room temperature multiwavelength erbium-doped fiber laser (EDFL) scheme with the wavelength spacing less than homogeneous broadening linewidth based on the inter-channel four-wave mixing (FWM). A stable CW MW-EDFL is firstly implemented based on a length of high nonlinear photonic crystal fiber (HNL-PCF) and sampled-fiber Bragg grating (SFBG). We further extend the idea of FWM induced self-stable operation of MW-EDFL to the multiwavelength mode-locking fiber ring laser to generate ultra-short, ultra-fast, multiwavelength and synchronized pulse sources. 2 and 4 wavelengths anchored on ITU-T standards with 100 GHz channel spacing are successfully mode-locked at 10-GHz simultaneously, without gain competition.
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Ping Shum, Xingyong Dong, Ming Tang, Yandong Gong, Songnian Fu, Hui Dong, and Xiufeng Yang "Nonlinearity enhanced fiber ring laser", Proc. SPIE 6379, Photonic Applications for Aerospace, Transportation, and Harsh Environments, 637901 (25 October 2006);

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