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Resonant couplers acting as add-drop filters made with silica-on-silicon waveguide technology

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4 Author(s)
Yaffe, H.H. ; AT&T Bell Labs., Norcross, GA, USA ; Henry, C.H. ; Serbin, M.R. ; Cohen, L.G.

Add-drop filters are demonstrated using silica-on-silicon optical waveguide technology. This device consists of a full directional coupler subdivided by Mach-Zehnder sections. Tapering of the coupling coefficients is experimentally shown to dramatically reduce the filters' sidelobes. Only one photolithographic step is required using the silica planar waveguide technology, yielding accurate wavelength control of the filters. Excellent agreement between measurement and design was achieved

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Lightwave Technology, Journal of  (Volume:12 ,  Issue: 6 )