Title :
Effect of the first-order mode in access waveguides on the performance of unbalanced MMI couplers
Author :
Patent, E.A. ; van der Tol, J.J.G.M. ; Karouta, F. ; Binsma, J.J.M. ; Smit, M.K.
Author_Institution :
Opto-Electron. Devices Group, Eindhoven Univ. of Technol., Netherlands
Abstract :
Unbalanced multimode interference (MMI) couplers are optical integrated components widely used in photonic integrated circuits. Couplers with two fixed coupling ratios: 85/15 and 15/85 are studied in this paper. Low-loss MMI couplers are designed and fabricated. Excitation of the first-order mode in access waveguides of MMI couplers can influence the excess losses and the coupling ratio of these components. The effect of the first-order mode excitation was simulated and confirmed by the experimental results, which are presented in this paper.
Keywords :
integrated optics; optical couplers; optical fabrication; optical losses; optical waveguides; access waveguides; coupling ratio; excess losses; first-order mode; low-loss MMI couplers; optical integrated components; photonic integrated circuits; unbalanced MMI couplers; unbalanced multimode interference couplers; Circuit simulation; Couplers; Coupling circuits; Integrated optics; Interference; Optical devices; Optical interferometry; Optical sensors; Optical waveguide components; Optical waveguides;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.831061
