We present all-fiber tunable lasers using single-mode–multimode–single-mode (SMS) structures involving a liquid cladding in the multimode section. We make use of large thermooptic coefficients of the refractive-index liquids to tune the laser oscillation wavelength. The oscillation wavelength is changed over a range of 100 nm from 1858 nm to 1958 nm by controlling the temperature of the SMS structures in the Tm/Ho-codoped fiber ring resonators.
We present broadband tuning in Tm/Ho-codoped fiber lasers based on multimode interference effects. The oscillation wavelength is controlled over 100 nm by making use of large thermooptic coefficients of liquid cladding in a multimode section.
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