We　report　the　first,　to　the　best　of　our　knowledge,　observation　of　second-harmonic　generation　(SHG)　in　a　high-index　doped　silica　micro-ring　resonator,　due　to　the　symmetry-breakinginduced　χ(2)　at　the　core　and　cladding　interface　of　the　waveguide.　The　generated　SH　power　is　shown　to　have　quadratic　dependence　on　the　in-cavity　power　of　the　fundamental　pump　at　around　1550　nm.　The　pumping　wavelength　sweep　method　is　adopted　to　fulfill　the　phase-matching　condition　for　maximum　conversion　efficiency　of　SHG.　This　work　offers　a　new　approach　to　generate　a　visible　source　for　the　visible-light　integrated　optical　platform　from　infrared-visible　light　conversion.　©　2022　Optica　Publishing　Group.