A fiber sensor (130) package is disclosed. The fiber sensor package includes an interconnection (138) between a first optical fiber (132) and a second optical fiber (136) within a tubing (140) such that the first and second optical fibers are at least partially disposed within that tubing. A bonding material (142) is disposed across an edge of the interconnection around at least a part of the circumferential surfaces of the first and second fibers, holds rigid the interconnection of the first and second optical fibers. The first optical fiber may be a sapphire fiber. The sensor may be used for high temperature measurements in coal gasifiers.