Title :
A Tapered Structure for Compact Multimode Interference Coupler
Author_Institution :
Tezpur Univ., Tezpur
fDate :
4/15/2008 12:00:00 AM
Abstract :
A new tapered structure based on general interference has been proposed and realized by using silica waveguides with a silicon oxinitride (SiON) core for the reduction of coupling length of the 2times2 multimode interference (MMI) coupler. The coupling characteristics of the proposed structure are compared with those of conventional MMI structures using a simple mathematical model based on sinusoidal modes. The beat length for the proposed tapered MMI coupler is reduced by 45% of that of a conventional MMI coupler. The effect of power imbalance on fabrication tolerance of the proposed tapered MMI coupler are also studied and compared with other tapered MMI couplers.
Keywords :
integrated optics; light interference; optical couplers; optical waveguides; silicon compounds; SiO2; SiON; beat length; coupling length; fabrication tolerance; multimode interference coupler; power imbalance; silica waveguides; silicon oxinitride core; tapered structure; Coupling circuits; Interference; Optical arrays; Optical device fabrication; Optical sensors; Optical waveguides; Reflection; Sensor arrays; Silicon compounds; Waveguide discontinuities; Integrated optics;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2008.918906
