Stable and wavelength-tunable erbium-doped fiber double-ring laser in S-band window operation

A stable and tunable S-band erbium-doped fiber (EDF) double-ring laser has been proposed and experimentally demonstrated. Based on the double-ring configuration, the EDF ring laser exhibits more stable output wavelengths and powers than those of the single-ring. Wide tunable range of 1484-1518 nm, the side-mode suppression ratio (SMSR) of larger than 44.7 dB/0.05 nm and the output power of larger than −2.2 dB m over the operation range of 1484-1510 nm have been retrieved.