Sub-Angstrom Planar Channel-Dropping Filters

Abstract

The increased interest in dense wavelength division multiplexing for optical broadcast networks has generated a need for sub-Angstrom bandwidth optical filters which can be used to extract a single wavelength signal from a multiple wavelength optical bus. Recently, a novel design for narrow-band channel-dropping filters (CDF) has been proposed by H.A. Haus.1 These filters use waveguide couplers combined with quarter-wave shifted DFB resonators, and are capable of selecting channels significantly narrower than 1 Å bandwidth, by appropriate choice of the coupling parameters in the device. In this paper we demonstrate the fabrication and operation of such a device for the first time © 1993 Optical Society of America