Wavelength-division multiplexing (WDM) systems are attractive for increasing transmission capacity and network flexibility, and they require various kinds of filters. The use of silica-based planar lightwave circuit (PLC) technology  is one of the most promising ways to fabricate filters for WDM networks, because PLC devices have low insertion losses, design flexibility, high reliability, and good reproducibility.
© 1996 Optical Society of AmericaPDF Article
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