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Two port s-matrix for a complex PT-symmetric potential may have uni-modulareigenvalues. If this happens for all energies, there occurs a perfect emissionof waves at both ends. We call this phenomenon transparency which is distinctlydifferent from coherent perfect absorption with or without lasing. Using theversatile PT-symmetric complex Scarf II (scattering) potential, we demonstrateanalytically that the transparency can occur regardless of whether PT-symmetryis unbroken or broken or if there are only scattering states. In these threecases, for a given value of the strength of the real part; the strength of theimaginary part $|V_2|$ of the potential lies in $(0, V_{\alpha}), (V_{\alpha},V_{\beta})$ and $(0,V_{\beta})$ respectively. Several other numerically solvedpotentials also support our findings.

Transparency of the PT-symmetric complex potentials for coherent injection