Power loss analysis at a step discontinuity of a multimode optical waveguide

• Published in: Journal of lightwave technology Vol. 16; no. 12; pp. 2451 - 2457
• Main Authors: Oz, M., Krchnavek, R.R.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.12.1998; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Circuit properties; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Integrated optics; Integrated optics. Optical fibers and wave guides; Magnetic analysis; Optical and optoelectronic circuits; Optical devices; Optical losses; Optical surface waves; Optical waveguide theory; Optical waveguides; Slabs; Tellurium; Waveguide discontinuities; Discontinuity; Theoretical study; Multimode waveguide; Optical waveguide; Numerical method; TM mode; Evanescent wave; Radiated power; Maxwell equation; TE mode
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/50.736637

In this paper, we analyze the radiated, reflected, and transmitted power due to an abrupt step discontinuity in a multimode optical waveguide by a numerical technique without any physical approximations other than neglecting the evanescent radiation modes. The amount of power loss depends primarily on the number of modes the portion of the waveguide on each side can support. The range of thickness mismatch for which reasonably low loss occurs depends on the wavelength. The technique can be used to analyze step discontinuities of symmetric or asymmetric, single or multimode optical slab waveguides with arbitrary cross section accurately.