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Optical Interleaving filters are attractive components in Wavelength Division Multi/Demultiplexing (WDM) systems especially narrower than 100GHz channel spacing system. Several types of interleaving filters have been proposed and realized. An interleaving filter is required to have the Box-like characteristics such as the periodic response, flat-passband, low insertion loss and low crosstalk. In addition, low chromatic dispersion (CD) is indispensable for Dense WDM (DWDM) systems. We focus on planar lightwave circuit (PLC) interleaving filters. In this paper, we present interleaving filters with a tandem configuration of Fourier transform-based Mach-Zehnder Interferometers (MZIs). The circuit using PLC technique is fabricated with high index contrast waveguides of ? 1.5%. We also have demonstrated integrated 1x4 (25-100GHz,50-200GHz) interleaving filters and arrayed waveguide gratings (AWGs) with 200GHz-channel spacing suitable for interleaving WDM system.

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A 128-channe1, IOOGHz spacing arrayed waveguide grating (AWG) module with a pitch conversion waveguide has been realized, which could be usefir1 for practical applications.