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A fiber feedthrough assembly having a rigidizing member in the form of a quartz tube surrounding an axial length of a glass fiber defined between a shoulder formed by the jacket of the fiber and the axially inner end of a hermetic seal. The coefficients of thermal expansion of the tube and the fiber

A fiber feedthrough assembly having a rigidizing member in the form of a quartz tube surrounding an axial length of a glass fiber defined between a shoulder formed by the jacket of the fiber and the axially inner end of a hermetic seal. The coefficients of thermal expansion of the tube and the fiber are substantially equal.

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In an optical fiber feedthrough assembly of the type having a sleeve, an optical fiber in the sleeve and a seal between the fiber and the sleeve, the fiber having a jacket thereon, the jacket being fixed to the sleeve with a portion of the jacket being removed to define a shoulder such that a predet

In an optical fiber feedthrough assembly of the type having a sleeve, an optical fiber in the sleeve and a seal between the fiber and the sleeve, the fiber having a jacket thereon, the jacket being fixed to the sleeve with a portion of the jacket being removed to define a shoulder such that a predetermined axial length of the fiber is exposed between the shoulder and the seal, the jacket having the tendency to grow out in response to thermal cycling whereby the fiber may fracture and become discontinuous, wherein the improvement comprises: a rigidizing member in the form of a tube surrounding the predetermined axial length of the fiber, the tube being in abutting contact with the shoulder and in abutting contact with the seal, the combination of the tube and the fiber having a rigidity associated therewith such that the fiber is able to withstand the effects of grow out without fracturing.