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Fibre-optic micro-ring-resonator with 2 mm diameter

: Caspar, C.; Bachus, E.-J.

Electronics Letters 25 (1989), Nr.22, S.1506-8
ISSN: 0013-5194
Fraunhofer HHI ()
fibre optics; optical filters; optical losses; optical waveguide components; resonators; fibre optic resonator; two port type; micro-ring-resonator; manufacturing; measurement; absorption resonator; biconical reduced fibre diameter; free spectral range; optical frequency response; insertion loss; power coupling coefficient; 2 mm; 1.55 micron; 30 GHz; 1.2 db

The authors report on the manufacturing and measurement of a fibre micro-ring absorption resonator for lambda =1.55 mu m with a biconical reduced fibre diameter down to 8.5 mu m. The small ring diameter of 2 mm exhibits a large free spectral range (FSR) of 30 GHz. From the optical frequency response, a finesse of 4.7 and an insertion loss of 1.2 dB were measured and the power coupling coefficient was calculated to be 0.28. To the authors' knowledge this is the smallest optical ring resonator reported so far.