Abstract

The increased interest in dense wavelength division multiplexing for optical broadcast networks has generated a need for sub-Angstroni bandwidth optical filters that 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-Åbandwidth, 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