Numerical study of TE waves propagating in multibranch couplers

Abstract

The evolution of TE-polarized waves propagating in the linear and nonlinear multibranch coupler is studied. The propagation of the waves in both directions is calculated by the beam-propagation method (BPM). The numerical results of simulation show that the minimum insertion loss of the nonlinear multibranch coupler is less than 0.088 dB, whereas that of the linear multibranch coupler is more than 3 dB.