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A simple, low-cost technique for fabrication of high performance optical fiber oxygen sensor is described. The technique is based on coating the end of an optical fiber with ormosil composite xerogel film sequestered with luminophore palladium (II) meso-tetrakis(pentafluorophenyl)porphyrin (PdTFPP) prepared by a sol-gel process. The composite xerogel studied is n-propyltrimethoxysilane (n-propyl-TriMOS)/tetraethylorthosilane (TEOS)/n-octyltriethoxy silane (Octyl-triEOS). The experimental result reveals that the PdTFPP-doped n-propyl-TriMOS/TEOS/Octyl-triEOS oxygen sensor has sensitivity of 263. The experimental results confirm that the current oxygen sensor exhibits the linear Stern-Volmer plot and high-sensitive based on the oxygen indicator embedded in n-propyl-TriMOS/TEOS/ Octyl-triEOS composite xerogel. [ABSTRACT FROM AUTHOR]