Title :
A rigorous comparison of the performance of directional couplers with multimode interference devices
Author :
Rajarajan, M. ; Rahman, B.M.A. ; Grattan, K.T.V.
Author_Institution :
Dept. of Electr. Electron. & Inf. Eng., City Univ., London, UK
fDate :
2/1/1999 12:00:00 AM
Abstract :
The authors report, for the first time, a direct comparison between a directional coupler and a multimode interference-based device, in relation to their performance characteristics such as crosstalk, polarization dependence and the effect of fabrication tolerances. The coupling efficiency for a nonidentical coupler, produced inadvertently due to problems with fabrication tolerances, is also demonstrated. The vector finite element (FE) and the least squares boundary residual (LSBR) methods are employed as the numerical tools used in this simulation study
Keywords :
integrated optoelectronics; least squares approximations; light polarisation; optical crosstalk; optical directional couplers; optical fabrication; optical waveguide theory; coupling efficiency; fabrication tolerances; least squares boundary residual methods; multimode interference devices; multimode interference-based device; nonidentical coupler; numerical tools; optical crosstalk; optical directional couplers; performance characteristics; polarization dependence; rigorous comparison; simulation study; vector finite element; Crosstalk; Directional couplers; Fabrication; Finite element methods; Interference; Least squares methods; Optical coupling; Optical signal processing; Photonic integrated circuits; Propagation constant;
Journal_Title :
Lightwave Technology, Journal of
