A fiber optic array is miniaturized in a configuration that includes an
input collimator, a first birefringence crystal, a waveplate, a Faraday
rotator, a second birefringence crystal and a second collimator. The
elements are aligned along a common optical axis. A light beam along the
optical axis that is passed through the first collimator emerges off of
the optical axis and through the remaining elements. It re-emerges from
the fiber optic array on axis. The configuration provides substantial
attenuation in a backward direction.