Abstract
An important element in optical transmission networks based on Wavelength Division Multiplexing (WDM) is the Optical Add-Drop Multiplexer (OADM). It allows the selective dropping of one or several wavelength channels (fixed or selectable) and the addition of new signals at the same wavelengths. To reduce cost, an integrated optics solution would be preferable to discrete components. Several technologies can be used, including acousto-optic devices in LiNbO3 [1], planar diffraction gratings in InGaAsP/InP [2] or SiO2/Si [3], and arrayed-waveguides, also in InGaAsP/InP [4] or SiO2/Si. One of the most advanced examples to date is a 16 channels device in SiO2/Si [5] Using three arrayed-waveguide grating demultiplexers on the same chip (80 by 65 mm).
© 1996 Optical Society of America
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