Title :
The digital directional coupler: improved design
Author_Institution :
Dept. of Electr. Eng., Imperial Coll., London, UK
Abstract :
Using a simple analytic model (weak-coupled mode theory), a new design is presented for digital directional couplers (i.e., directional couplers with tapered velocity mismatch and tapered coupling). These have relative immunity to variations in fabrication and operating conditions, and have a steplike switch response. The analysis shows that significantly improved performance can be obtained by simple modifications to the device shape given by R.R.A. Syms and R.G. Peall (1989).<>
Keywords :
directional couplers; integrated optics; optical communication equipment; optical couplers; analytic model; device shape; digital directional coupler; operating conditions; steplike switch response; tapered coupling; tapered velocity mismatch; weak-coupled mode theory; Acoustic measurements; Acoustic waves; Directional couplers; Electron optics; Frequency response; Optical device fabrication; Optical devices; Optical filters; Optical switches; Optical waveguides;
Journal_Title :
Photonics Technology Letters, IEEE
