A Comparative Study of Higher Order Bragg Gratings: Coupled-Mode Theory Versus Mode Expansion Modeling
H. Wenzela , R. Güthera, A.M. Shams-Zadeh-Amirib, and P. Bienstmanc
Published in:
IEEE J. Quant. Electron., vol. 42, no. 1, pp. 64-70 (2006).
Abstract:
The modal reflectivity and loss of lamellar diffraction gratings to be used in distributed-feedback and distributed-Bragg reflector lasers were computed in dependence of wavelength, duty cycle and Bragg order. Different methods based on the approximate coupled-mode theory and and the exact bidirectional mode expansion modeling were compared and a good mutual agreement was found. The slab Green’s function needed to compute the coupling coefficients can be approximated by that of a homogeneous unbounded medium with sufficient accuracy.
a Ferdinand-Braun-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, D-12489 Berlin, Germany
b Photonami Corporation Richmond Hill, ON L4B 1E4, Canada
c Department of Information Technology, Ghent University, Ghent 9000, Belgium.
Index Terms:
Bragg grating, mode matching, radiation losses.
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