Huntoon Nathan R, Christensen Marc P, MacFarlane Duncan L, Evans Gary A, Yeh C S
Department of Electrical Engineering, Southern Methodist University, P.O. Box 750338 Dallas, Texas 75275-0338, USA.
Appl Opt. 2008 Oct 20;47(30):5682-90. doi: 10.1364/ao.47.005682.
An optical coupler for integrated photonic circuits is presented and analyzed. The coupler is based on frustrated total internal reflection (FTIR) and offers high efficiency in a compact footprint. Analytic expressions for the transmission and reflection coefficients of the coupler are obtained using a plane-wave theory and experimentally verified. Finite-difference time-domain modeling of FTIR is discussed and modeling results of the coupler are presented. A parametric discussion of the FTIR coupler provides design tools for making 3 dB couplers.
