BPM is a quick and easy method of solving for fields in integrated optical devices. It is typically used only in solving for intensity and modes within shaped (bent, tapered, terminated) waveguide structures, as opposed to scattering problems.
BPM serves as an expedient method for calculating field values in integrated optical components. Its application is primarily confined to scenarios involving the determination of intensity and modes within shaped (bent, tapered, terminated) waveguide configurations, excluding scattering problems.