Abstract

Ring resonators are promising building blocks for developing compact optical filters with arbitrary functions; however, a major challenge for planar waveguide filter implementations is to overcome the limited free spectral range (FSR) for a given core-to-cladding refractive-index difference Δ while maintaining low loss and a large range of coupling ratios. The loss and coupling of rings operating in the whispering-gallery-mode regime were investigated by use of Ge-doped silica waveguides with a low refractive-index difference Δ=0.75%. A FSR of 12  GHz with a loss of 0.36 dB/cm was demonstrated with coupling ratios of 30% (41% optimum).

© 1998 Optical Society of America

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