Abstract
Using the coupling between a standard single-mode fiber and single higher-order modes in a high-index overlay waveguide, we demonstrate a wavelength-filtering device with a channel-dropping response. Two types of filter are described. One uses a thin overlay waveguide, giving a single tunable dropped band response in the 1.2–1.6-μm wavelength region with rejection greater than 20 dB and an insertion loss of about 0.5 dB. The other uses a thick overlay waveguide and gives a comb-filter response with a dropped channel spacing of 13 nm with 20-dB rejection and an insertion loss of between 1 and 4 dB.
© 1987 Optical Society of America
Full Article | PDF ArticleMore Like This
K. McCallion, W. Johnstone, and G. Fawcett
Opt. Lett. 19(8) 542-544 (1994)
L. Bradley and C. A. Millar
Opt. Lett. 12(5) 358-360 (1987)
I. S. Mauchline and G. Stewart
Opt. Lett. 18(7) 500-502 (1993)