A new concept for optical filters for pulse compression in optical communication systems is presented. The
effect of filtering is not based on resonances as used in Bragg gratings, but it is achieved by interferences
of parts of the optical wave. The filter consists of three strip loaded dielectric waveguides. Besides two
amplification regions, there are two herringbone like grating structures. The first grating pair delivers the
dispersion behavior of the filter. The second grating pair is a bandpass which should improve the amplitude
response of the filter. The gratings can be built up as a single or multi channel filter. Besides a theoretical
analysis of the filter, the performance of the structure will be presented. It will be shown that not only high
dispersion values can be reached, but additionally a signal amplification is possible.
A novel architecture of an optical filter for pulse compression in dense wavelength-division multiplexing
(DWDM) systems is presented. We propose a comb filter for dispersion compensation within a transmission
channel. A pair of chirped gratings with slanted grating lines is used. The effect of filtering is not based on
resonances as used in Bragg gratings, but it is achieved by interferences of parts of the optical wave. Furthermore,
the filter concept enables an amplification to compensate transmission losses. The filter parameters
are adjusted by different phase shiftings of the grating lines. Their geometrical dimensions are equal for all
grating lines. It will be shown, how different grating lengths and phase shiftings between the grating lines
contribute to the transmission characteristic of the filter. We will give design rules for the chirp to develop
appropriate filter functions for positive or negative dispersion values up to 1500 ps/nm while the linearity of
the group delay is restricted to 6.5%. The performance of the structure will be presented by a filter designed
for a DWDM-system with a channel distance of 0.4 nm.
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