Lossless tapers, Gaussian beams, and free-space modes: standing waves versus through-flowing waves

Antonio D. Capobianco; Michele Midrio; Carlo Gian Someda; Stefano Curtarolo

doi:10.1117/12.347921

28 April 1999 Lossless tapers, Gaussian beams, and free-space modes: standing waves versus through-flowing waves

Antonio D. Capobianco, Michele Midrio, Carlo Gian Someda, Stefano Curtarolo

Proceedings Volume 3666, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98; (1999) https://doi.org/10.1117/12.347921
Event: International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, 1998, New Delhi, India

Abstract

It was noticed in the past that, to avoid physical inconsistencies, in Marcatili's lossless tapers through- flowing waves must be drastically different from standing waves. First, we reconfirm this by means of numerical results based on an extended BPM algorithm. Next, we show that this apparently surprising behavior is a straightforward fallout of Maxwell's equations. Very similar remarks apply to Gaussian beams in a homogeneous medium. As a consequence, Gaussian beams are shown to carry reactive powers, and their active power distributions depart slightly from their standard pictures. Similar conclusions hold for free-space modes expressed in terms of Bessel functions.

Citation Download Citation

Antonio D. Capobianco, Michele Midrio, Carlo Gian Someda, and Stefano Curtarolo "Lossless tapers, Gaussian beams, and free-space modes: standing waves versus through-flowing waves", Proc. SPIE 3666, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, (28 April 1999); https://doi.org/10.1117/12.347921

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