Theory shows that near-complete pump depletion can be obtained in uniform f
iber-optic parametric amplifiers (OPA's) for a particular phase-matching co
ndition. We have demonstrated 92% pump depletion in a cw fiber OPA with a 2
00-mW pump at 1560 nm in an 11-km-long dispersion-shifted fiber. (C) 2001 O
ptical Society of America.