Title :
Compact microring notch filters
Author :
Absil, P.P. ; Hryniewicz, J.V. ; Little, B.E. ; Wilson, R.A. ; Joneckis, L.G. ; Ho, P.-T.
Author_Institution :
Lab. for Phys. Sci., College Park, MD, USA
fDate :
4/1/2000 12:00:00 AM
Abstract :
Microresonator filters reported so far have been all-pole-type filters. We report two experimental realizations of zero-type (notch) filters using GaAs-AlGaAs microring resonators. The first is a ring coupled to one side of a Mach-Zehnder interferometer, the Y-branch of which has an effective splitting angle of 50/spl deg/ with 0.5-dB loss. The second is a ring whose loss exactly matches the coupling to the input/output waveguide with an extinction greater than 20 dB.
Keywords :
III-V semiconductors; Mach-Zehnder interferometers; aluminium compounds; gallium arsenide; integrated optics; micro-optics; notch filters; optical losses; optical resonators; optical waveguide filters; semiconductor heterojunctions; GaAs-AlGaAs; GaAs-AlGaAs microring resonators; Mach-Zehnder interferometer; Y-branch; all-pole-type filters; compact microring notch filters; coupling; effective splitting angle; extinction; input/output waveguide; loss; microresonator filters; notch filters; zero-type filters; Chebyshev approximation; Matched filters; Optical filters; Optical interferometry; Optical losses; Optical resonators; Optical ring resonators; Optical waveguides; Resonator filters; Throughput;
Journal_Title :
Photonics Technology Letters, IEEE
