The phase jumps in a linear coupler and a nonlinear coherent coupler are demonstrated analytically. The theoretical results show that slight changes in the ratio of input powers or a mismatch in the linear coupler slight changes in the input power in the nonlinear coupler can lead to a phase shift of π. This characteristic of the coupler may lead to electro-optical switching with an ultralow switching voltage or to all-optical switching with low switching power.
© 2001 Optical Society of America
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(190.4360) Nonlinear optics : Nonlinear optics, devices
(230.4320) Optical devices : Nonlinear optical devices
Youfa Wang, Ching-Kwang Lee, and Jinlu Kuang, "Phase jump in an optical directional coupler," J. Opt. Soc. Am. B 18, 1554-1562 (2001)