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A high-performance S-band single-longitudinal-mode (SLM) erbium-doped fiber(EDF) ring cavity laser based on a depressed cladding EDF is investigated andexperimentally demonstrated. We combine a double-ring passive resonator (DR-PR)and a length of unpumped polarization maintaining (PM) EDF in the laser cavityto achieve the SLM lasing without mode hopping. The DR-PR, composed of twoefficient dual-coupler fiber rings, is utilized to expand the free spectralrange of the EDF ring cavity laser and to eliminate the dense longitudinalmodes greatly. The PM EDF, insusceptible to random change induced byenvironmental perturbations, is used as a saturable absorber filter toguarantee and to stabilize the SLM operation of the EDF ring cavity laser. Atthe pump power of 400 mW, we obtain an SLM EDF ring laser with a linewidth asnarrow as 568 Hz, an optical signal-to-noise ratio as high as 77 dB, and arelative intensity noise as low as 140 dB/Hz at the frequency over 5 MHz.Meanwhile, the stability performance of both the wavelength lasing and theoutput power, the dependence of the OSNR and the output power on pump power forthe S-band fiber laser are also investigated in detail.

S-band single-longitudinal-mode erbium-doped fiber ring laser with ultra-narrow linewidth, ultra-high OSNR, high stability and low RIN