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Tunable, Single-Wavelength Fiber Ring Lasers Based on Rare Earth-Doped, Double-Peanut Fiber Interferometers
Single-wavelength fiber ring lasers are demonstrated using rare earth-doped, double-peanut fiber interferometers (RDDPFIs) 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
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