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Optics Letters

Optics Letters


  • 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)

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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

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)

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