Abstract

Recently nonlinear waveguide junctions have been investigated intensively for their interesting switching behaviors^1,2. The waves propagating in a nonlinear converging waveguide Y junction in which the two branches and the stem are single mode waveguides are less reported. For a linear case, the field injected into the thinner branch at a distance from the junction will not evolve into the fundamental mode of the stem, and the field injected into the thicker branch will propagate without loss³. Here we simulate the waves propagating in the Y junction with a nonlinear cladding by using beam propagation method⁴, and we find that the field injected into the thinner branch is possible to transmit to the stem with a high efficiency.

© 1991 Optical Society of America