Abstract

Wavelength-division multiplexing (WDM) communication systems require demultiplexing devices that efficiently separate the various channels upon reception. In recent years, many types of devices have been investigated,^1-2 which show great potential but their production costs can be significant. In order to obtain a simple low-cost solution for potential large-scale production, a passive hybrid demultiplexer, based on the Rowland configuration,³ was designed. It is composed of a polymer slab waveguide and concave diffraction grating cemented together to form an integrated assembly. The concave grating was obtained by bending a planar silicon substrate on which a grating was etched.² The use of a concave grating simplifies the device because no lenses are required, the concave grating acting as both a dispersive and a focusing element.³

© 1996 Optical Society of America