Abstract
In this paper, a stable and wavelength-tunable C-band erbium-doped fiber (EDF) ring laser is experimentally demonstrated. Here, utilizing an unpumped ytterbium-doped fiber with a length of 0.6 m inside the ring cavity serving as a spatial multi-mode interference is proposed to suppress the multi-longitudinal-mode for single-longitudinal-mode output. Therefore, the output powers and optical signal-to-noise ratios of the proposed EDF ring laser are between −11.74 and −4.65 dBm and 34.3 and 26.9 dB, respectively. Moreover, the output performance of stability is also analyzed and discussed.
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