A narrow-bandpass filter with a 15-dB signal-to-noise level is demonst
rated using Bragg-grating assisted mode conversion within a tapered wa
veguide. The potential effects of such filters in wavelength-division
multiplexing systems are discussed. (C) 1998 Optical Society of Americ
a. OCIS codes: 120.2440, 260.2030, 230.7370.