Two coherent microwave power sources of same frequency f, each generating P Watts of average power ,are combined using a four port network in the following manner

If the S-parameter of the 4-port network are $$\begin{bmatrix}0 & \frac{j}{\sqrt{2}}& \frac{-1}{\sqrt{2}}&0 \\\frac{j}{\sqrt{2}} & 0 & 0 &\frac{-1}{\sqrt{2}}\\\frac{-1}{\sqrt{2}} & 0& 0& \frac{j}{\sqrt{2}}\\0& \frac{-1}{\sqrt{2}}& \frac{j}{\sqrt{2}}&0\end{bmatrix}$$ what should be the phase difference between the inputs to maximize the output at port 2 and what is maximum the power?