  We study theoretically the proximity effect in a ferromagnetic semiconductor
with Rashba spin-orbit interaction. The exchange potential generates
opposite-spin-triplet Cooper pairs which are transformed into
equal-spin-triplet pairs by the spin-orbit interaction. In the limit of strong
spin-orbit interaction, symmetry of the dominant Cooper pair depends on the
degree of disorder in a ferromagnet. In the clean limit, spin-singlet $s$-wave
Cooper pairs are the most dominant because the spin-momentum locking stabilizes
a Cooper pair consisting of a time-reversal partner. In the dirty limit, on the
other hand, equal-spin-triplet $s$-wave pairs are dominant because random
impurity potentials release the locking. We also discuss the effects of the
spin-orbit interaction on the Josephson current.
