  We investigate the optimization of the photon polarization to increase the
yield of the Breit-Wheeler pair production in arbitrarily polarized plane wave
backgrounds. We show that the optimized photon polarization can improve the
positron yield by more than $20\%$ compared to the unpolarized case, in the
intensity regime of current laser-particle experiments. The seed photon's
optimal polarization is resulting from the polarization coupling with the
polarization of the laser pulse. The compact expressions of the coupling
coefficients in both the perturbative and nonperturbative regime are given.
Because of the evident difference in the coupling coefficients for the linear
and circular polarization components, the seed photon's optimal polarization
state in an elliptically polarized laser background, deviates considerably from
the orthogonal state of the laser polarization.
