Polarization-independent operation is a vitally important feature for optical components in communication systems. Fiber optical parametric amplifiers (OPAs) have many attractive features, but unfortunately they are not polarization-independent in their simplest forms; thus they need to be modified to become polarization-independent. Recently we demonstrated polarization-independent operation of a CW fiber OPA using a single pump and polarization diversity.1 The approach used two counter-propagating paths in a Sagnac loop, which may introduce undesirable crosstalk via XPM between these paths; also the use of a single pump implies that the idler is broadened by the pump dithering required for SBS suppression.2 Another disadvantage of the conventional one-pump OPA is the shape of the gain spectrum, which can vary by as much as 10 dB.3

© 2002 Optical Society of America

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