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Optics Letters

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  • Vol. 23, Iss. 3 — Feb. 1, 1998
  • pp: 186–188

Increasing the free spectral range of silica waveguide rings for filter applications

Christi K. Madsen* and Jian H. Zhao  »View Author Affiliations


Optics Letters, Vol. 23, Issue 3, pp. 186-188 (1998)
http://dx.doi.org/10.1364/OL.23.000186


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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

OCIS Codes
(120.2440) Instrumentation, measurement, and metrology : Filters
(160.6030) Materials : Silica
(230.7390) Optical devices : Waveguides, planar

Citation
Christi K. Madsen* and Jian H. Zhao, "Increasing the free spectral range of silica waveguide rings for filter applications," Opt. Lett. 23, 186-188 (1998)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-23-3-186


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References

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