An athermal package for fiber photonic devices includes three portions of
at least three materials, each having a coefficient of thermal expansion
that is different from the other two. In contrast, a conventional
athermal packages typically has only two materials. In a typical
application, an optical fiber containing a photonic device is attached to
the athermal package. The three materials of the athermal package are
selected and the three portions as sized to optimize a thermal response
of the package to that of the optical fiber.