Wavefront correction inside unbalanced nulling interferometer

In an unbalanced nulling interferometer (UNI) of our coronagraph system, the incidence light is divided into two, and they interfere by a reverse phase with different amplitude. Thereby, phase errors are magnified and we can correct a wavefront with higher precision. But phase errors of the incident wave will be magnified together with the wavefront errors inside UNI. Now, I am developing a control algorithm of the adaptive optics which removes the wavefront errors inside the interferometer by operating the phase of the light to a suitable value before dividing. In a simulation, wavefront accuracy improved by about 3 times with this technique, and also a comparable effect was acquired experimentally.