Single-wavelength fiber ring lasers are demonstrated using rare earth-doped, double-peanut fiber interferometers (RD-DPFIs) as the tunable narrow-band filters. With the relatively stronger opto-thermal effect, thermal tunability of the Ytterbium-doped DPFI (YD-DPFI) is effectively enhanced, as compared to the Erbium-doped DPFI (ED-DPFI). The ED-DPFI achieves single-wavelength lasing with a side-mode suppression ratio (SMSR) of ≈50 dB, a 3 dB bandwidth of <0.02 nm, and a wavelength tuning range from 1531.92–1544.28 nm. The YD-DPFI achieves a single-wavelength lasing with a SMSR of ≈40 dB, a 3 dB bandwidth of <0.04 nm, and a wavelength tuning range from 1036.50–1027.25 nm. In addition, laser output stabilities are also investigated. The proposed lasers have high stability and cost-effectiveness which may be useful for optical communication and sensing systems.

中文翻译：

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基于掺稀土双花生光纤干涉仪的可调谐单波长光纤环形激光器

使用掺杂稀土的双花生光纤干涉仪 (RD-DPFI) 作为可调谐窄带滤波器演示了单波长光纤环形激光器。由于具有相对较强的光热效应，与掺铒DPFI（ED-DPFI）相比，掺镱DPFI（YD-DPFI）的热可调性得到有效增强。ED-DPFI 实现单波长激光发射，边模抑制比 (SMSR) ≈50 dB，3 dB 带宽<0.02 nm，波长调谐范围为 1531.92–1544.28 nm。YD-DPFI 实现了单波长激光发射，SMSR ≈40 dB，3 dB 带宽<0.04 nm，波长调谐范围为 1036.50–1027.25 nm。此外，还研究了激光输出稳定性。