OptiTools has a utility for converting data from one software to the other. The Zemax Converter Utility in OptiTools can be used to convert the output file from Zemax to another format that OptiBPM can read as input to the beginning of a waveguide. OptiBPM can analyze the subsequent waveguide part of the system, and estimate the coupling loss on input. If the light needs to leave the waveguide and reenter a lens system, the Zemax converter can convert the output near-field-pattern to a form that Zemax can accept as input to a ray tracing problem. The data file in Optiwave has extension *.f3d and the data file for ZEMAX has extension *.zbf.