An optical fiber assembly having a hermetic seal portion includes a optical fiber
assembly and a metal pipe. The optical fiber assembly includes a metallized portion
where a portion exposed by peeling off a resin coating of the optical fiber assembly
is coated with metal. The metal pipe includes a feedthrough hole, an uncovered
portion, a brazed portion and an adhesive-fixed portion. The feedthrough hole has
a length necessary to cover a part of the metallized portion and a part of the
coated portion leading to one end of the metallized portion. The uncovered portion
has a housing groove leading to the feedthrough hole and contains a remainder of
the metallized portion and a part of the coated portion leading to the other end
of the metallized portion. The brazed portion hermetically seals the optical fiber
assembly to the metal pipe by brazing the metallized portion and the inner surface
of the feedthrough hole near a slanted upward opening of the feedthrough hole on
the housing groove side. The adhesive-fixed portion allows the optical fiber assembly
to be disposed on the uncovered portion adhere to the metal pipe and fixed thereto.
