ANALYSIS OF OPTICAL RIB SELF-IMAGING MULTIMODE INTERFERENCE (MMI) WAVEGUIDE DEVICES USING THE DISCRETE SPECTRAL INDEX METHOD

摘要

We have developed a semianalytical approach to study the propagation characteristics of multimode interference (MMI) waveguide structures. The effect of transverse cross-section geometry on self-imaging length and optical power throughput are investigated. We present results confirming that the nonquadratic modal dispersion encountered in stripe-loaded waveguides impairs self-imaging performance. Results indicate that the image degradation is more predominant for asymmetrically fed MMI waveguides. References: 13