Title :
Eigenmode matching and propagation theory of square meander-type couplers
Author :
Nolting, H.-P. ; Sztefka, G.
Author_Institution :
Heinrich-Hertz Inst. fuer Nachrichtentech. Berlin GmbH, Germany
Abstract :
The coupling efficiency of square meander-type or grating-assisted codirectional couplers has been calculated so far by common coupled mode theory. The theory presented calculates coupling efficiency, period length, dispersion behavior, etc. on the basis of the propagation of both eigenmodes of the asymmetrical coupler, using mode matching at the boundaries, which can be described as a rotation between the two eigenmodes of the undisturbed waveguide. This method is very fast, simple, accurate and gives a good insight into the physical behavior. Some examples verified by BPM calculations show the significance of this new theory.<>
Keywords :
diffraction gratings; directional couplers; eigenvalues and eigenfunctions; optical couplers; optical dispersion; optical waveguide theory; asymmetrical coupler; coupling efficiency; dispersion behavior; eigenmodes; grating-assisted codirectional couplers; mode matching; period length; physical behavior; propagation theory; square meander-type couplers; Couplers; Energy exchange; Equations; Gratings; Laser modes; Laser theory; Multiplexing; Tunable circuits and devices; Waveguide lasers; Waveguide theory;
Journal_Title :
Photonics Technology Letters, IEEE
