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In this research, we present and study an erbium fiber laser with triple-fiberring (TFR) scheme for continuous-wave (CW) wavelength-selection. The designed TFR not only can achieve single-longitudinal-mode (SLM) oscillation, but also can spread the tuning range from 1519.0 to 1583.0 nm covering C-and part of L-bands. Moreover, 0 dB power fluctuation can be obtained from 1523.0 nm to 1559.0 nm for flattened operation based on the compound-ring configuration. The Lorentzian laser linewidths of 22doi:10.1109/jphot.2020.3039988 fatcat:asvyh5nsh5e3peapx4ue7dg3hy