Mitigating PMD in Fiber Optical Parametric Amplifiers With Alternating Fiber Twists

We show by means of analytical calculations and numerical simulations that the impact of polarization-mode dispersion (PMD) on the gain spectrum of fiber optical parametric amplifiers (OPAs) can be reduced by imposing twists along the fiber axis. Alternating twists are used in order to cancel the induced circular birefringence.