  We first calculate the mean photon number and quadrature variance of
superposed coherent and squeezed light, following a procedure of analysis based
on combining the Hamiltonians and using the usual definition for the quadrature
variance of superposed light beams. This procedure of analysis leads to
physically unjustifiable mean photon number of the coherent light and
quadrature variance of the superposed light. We then determine both of these
properties employing a procedure of analysis based on superposing the Q
functions and applying a slightly modified definition for the quadrature
variance of a pair of superposed light beams. We find the expected mean photon
number of the coherent light and the quadrature variance of the superposed
light. Moreover, the quadrature squeezing of the superposed output light turns
out to be equal to that of the superposed cavity light.
