Continuous wave (CW) stimulated Brillouin scattering (SBS) phase conjugation in
step-index optical fibers was studied experimentally and modeled as a function
of fiber length. A phase conjugate fidelity over 80% was measured from SBS in a
40 m fiber using a pinhole technique. Fidelity decreases with fiber length, and
a fiber with a numerical aperture (NA) of 0.06 was found to generate good phase
conjugation fidelity over longer lengths than a fiber with 0.13 NA. Modeling and
experiment support previous work showing the maximum interaction length which
yields a high fidelity phase conjugate beam is inversely proportional to the
fiber NA2, but find that fidelity remains high over much longer fiber
lengths than previous models calculated. Conditions for SBS beam cleanup in
step-index fibers are discussed.
©2008 Optical Society of America
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