4. Insertion/extraction filter
One of the generic applications of integrated optics concerns optical multiplexing and demultiplexing. The insertion/extraction filter is one of the basic building blocks for these new systems. Conventional approaches tend to be unable to meet the required performance in terms of selectivity and/or directivity. Although photonic crystal-based structures suffer from modest performance in terms of guidance, are they capable of offering compact and original solutions? In the following, we will attempt to provide some initial answers.
4.1 Some topologies
Several types of insertion/extraction filters are described in the literature. The principle generally consists of extracting or adding a wavelength from a wave train traveling in a waveguide and transferring it...
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Insertion/extraction filter
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