Optical fibers of $12\mathrm{\mu m}$ diameter were coated with a sputter-deposited layer ( $4\mathrm{\mu m}$ thick) of titanium ( $1\text{at.}\%$ )-doped amorphous aluminum nitride. When optically pumped by an Nd:YAG green laser at $532\mathrm{nm}$ , laser action was observed in whispering gallery modes around the fiber (in a ring shape) at $780.5\mathrm{nm}$ with a quality factor $Q>1500$ . Other modes were also observed between 775 and $800\mathrm{nm}$ . The primary and secondary modes give a mode separation of $4.6\mathrm{nm}$ . No waveguide modes were observed in the cavity.