Abstract

Future optical fiber communication systems employing wave length-division multiplexing will require narrow bandwidth multiplexing and demultiplexing components with good isolation and cross talk performance and minimal insertion loss. Mach-Zehnder interferometers containing UV-induced Bragg gratings have previously been demonstrated for use as a wave-length-multiplexing/demultiplexing device in both planar waveguides¹ and optical fibers.^2,3 A serious drawback of these devices has been the need to use UV trimming of the interferometer following grating exposure to correct for the imbalance caused by unidentical gratings. Bandpass filters are presented here which exhibit good performance without requiring any interferometer balancing after writing the gratings.

© 1996 Optical Society of America