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Add-drop-filter,
2D simulation of a configuration with the following specification: background refractive index nb = 1.0, refractive index of the guiding regions ng = 3.2, resonator dimensions L = W = 1.54 µm, waveguide width w = 0.2 µm, gap width g = 0.29 µm, resonator separation d = 0.72 µm. |
The parameters resemble the values of
C. Manolatou, M.J. Khan, S. Fan, P.R. Villeneuve, H.A. Haus,
and J.D. Joannopoulos,
Coupling of modes analysis of resonant channel add-drop filters,
IEEE Journal of Quantum Electronics, 35(9):1322--1331, 1999.
All calculations are meant for TE polarization, i.e. Ey
is the single nonvanishing component of the electrical field.
Spectral response of the filter element:
The device is excited in port A
by the guided mode of the lower waveguide with the specified vacuum
wavelength λ.
PB - PD and PA
are the relative power transmissions to ports B, C, and D, and the relative
power reflected into port A.
Note that the curves related to
PA, PC, and PD
are almost superimposed.
The links at the positions indicated by the the blue tick
marks lead to illustrations of the time dependent electric field.
The pronounced resonance at 1.532 µm:
Note that the colour levels of the images linked to this figures are
adjusted to the individual field / energy range; colour levels in plots
belonging to different wavelengths are not comparable.
Caution: The simulations assume vanishing electromagnetic fields at
x = +/-5 µm; the presence of these artificial boundaries may
influence the results.