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Summary: Fabrication methods of optical resonant filters
with a close-to-rectangle filtering profile
Rabi Rabady and Ivan Avrutsky
The potential applications of optical resonant filters for optical communication systems can be significant.
Three approaches to achieve a close-to-rectangle filtering profile for optical resonant filter were investi-
gated and proven experimentally. The combination of the filtering sharpness, which comes from the
resonance nature, and a flattened filtering window realized the close-to-rectangle filtering profile that can
enhance the bandwidth efficiency. © 2004 Optical Society of America
OCIS codes: 120.2440, 220.0220.
1. Introduction
Optical resonant filters can be an alternative for
Bragg gratings filters1,2 that are used for notch filter-
ing in modern optical communications. Bragg grat-
ings can be realized reliably and with acceptable
accuracy in positioning the center wavelength of the
notch-filtering window. Moreover, they can be mod-
ified to compensate for group velocity dispersion and
to reduce the sideband effects by use of apodized in-
dex profile gratings. In this paper we investigate
the potential for the use of optical resonant filters in
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