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Optical filters and in particular optical add/drop multiplexers (OADMs) for single-wavelength bands, are key components of WDM systems. Typically OADMs are designed using Mach-Zehnder Interferometers (MZIs) or optical circulators, using Bragg gratings to provide frequency selection. These device designs are expensive and require sophisticated fabrication/assembly procedures. The OADM proposed here...
This paper presents results from the theoretical and experimental analysis of add/drop filters based on the grating-frustrated coupler (GFC). GFC filtering heavily relies on synchronous operation, which is difficult to achieve without adhoc postfabrication processing. The double-GFC (DGFC) is analyzed here in detail as an add/drop filter to reliably achieve synchronism. The DGFC is composed of two...
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