DocumentCode :
982402
Title :
Radiation loss of grating-assisted directional couplers using the Floquet-Bloch theory
Author :
Sun, Nai-Hsiang ; Chou, Chih-Cheng ; Chang, Hung-Wen ; Butler, Jerome K. ; Evans, Gary A.
Author_Institution :
Dept. of Electr. Eng., I-Shou Univ., Kaohsiung, Taiwan
Volume :
24
Issue :
6
fYear :
2006
fDate :
6/1/2006 12:00:00 AM
Firstpage :
2409
Lastpage :
2415
Abstract :
The Floquet-Bloch theory (FBT) is used to determine the radiation loss of a grating-assisted directional coupler. Improper waves obtained by FBT represent leakage and produce radiation loss along the transverse direction. By summing the fields of all leaky harmonics, the power flow radiated into the superstrate and substrate can be calculated from Poynting´s theorem. However, the locations at which these summations occur impact the accuracy. An analytic formula for radiation loss is also derived. Results from both the FBT and the analytic formula are compared with results obtained using the coupled-mode theory.
Keywords :
coupled mode analysis; diffraction gratings; integrated optics; optical directional couplers; optical losses; Floquet-Bloch theory; Poynting theorem; coupled-mode theory; grating-assisted directional coupler; radiation loss; Councils; Directional couplers; Flyback transformers; Gratings; Load flow; Optical losses; Optical waveguides; Power system harmonics; Resonance; Sun; Floquet–Bloch theory (FBT); gratings; optical directional couplers;
fLanguage :
English
Journal_Title :
Lightwave Technology, Journal of
Publisher :
ieee
ISSN :
0733-8724
Type :
jour
DOI :
10.1109/JLT.2006.874574
Filename :
1643800
Link To Document :
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