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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 17 — Aug. 20, 2007
  • pp: 10553–10561

Modeling and measurement of losses in silicon-on-insulator resonators and bends

Shijun Xiao, Maroof H. Khan, Hao Shen, and Minghao Qi  »View Author Affiliations

Optics Express, Vol. 15, Issue 17, pp. 10553-10561 (2007)

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We present an analytical model to quantify losses in resonators and bends without uncertain contributions from fiber coupling in/out or waveguide cleavage facets. With resonators in add-drop configuration, intrinsic losses are calculated from the free spectral range, through-port extinction and drop-port bandwidth. We fabricated and characterized silicon-on-insulator resonator for loss analysis. At 1.55 µm, racetrack resonators with a bending radius of 4.5 µm show intrinsic losses as small as 0.14±0.014 dB/round-trip. Meanwhile, intrinsic losses increase up to 1.23 dB/round-trip in the racetrack resonator that has a bending radius of 2.25 µm. Losses in a 180o bend are estimated as a half of the intrinsic losses in these racetrack resonators, i.e., 0.07±0.007 dB/turn for a bending radius of 4.5 µm and 0.62 dB/turn for a bending radius of 2.25 µm. Loss in a 90° bend with a radius of 4.5 µm is determined to be 0.06±0.006 dB/turn at 1.55 µm. The losses in 180° or 90° bends are found to be mainly due to the transition loss between waveguide bends and straight waveguides.

© 2007 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(220.4000) Optical design and fabrication : Microstructure fabrication
(230.5750) Optical devices : Resonators
(250.5300) Optoelectronics : Photonic integrated circuits

ToC Category:
Integrated Optics

Original Manuscript: May 18, 2007
Revised Manuscript: August 1, 2007
Manuscript Accepted: August 2, 2007
Published: August 6, 2007

Shijun Xiao, Maroof H. Khan, Hao Shen, and Minghao Qi, "Modeling and measurement of losses in silicon-on-insulator resonators and bends," Opt. Express 15, 10553-10561 (2007)

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  1. K. K. Lee, D. R. Lim, H.C. Luan, A. Agarwal, J. Foresi, and L. C. Kimerling, "Effect of size and roughness on light transmission in a Si/SiO2 waveguide: experiments and model," Appl. Phys. Lett. 77, 1617 (2000). [CrossRef]
  2. K. K. Lee, D. R. Lim, and L. C. Kimerling, "Fabrication of ultralow-loss Si/SiO2 waveguides by roughness reduction," Opt. Lett. 26, 1888-1890, (2001). [CrossRef]
  3. Y. Vlasov and S. McNab, "Losses in single-mode silicon-on-insulator strip waveguides and bends," Opt. Express 12, 1622-1631 (2004). [CrossRef] [PubMed]
  4. J. Niehusmann, A. Vörckel, P. H. Bolivar, T. Wahlbrink, W. Henschel and H. Kurz, "Ultrahigh-quality-factor silicon-on-insulator microring resonator," Opt. Lett. 29, 2861-2863 (2004). [CrossRef]
  5. Q. Xu, B. Schmidt, S. Pradhan, and M. Lipson, "Micrometer-scale silicon electro-optic modulator," Nature 435, 325-327 (2005). [CrossRef] [PubMed]
  6. Q. Xu, B. Schmidt, J. Shakya, and M. Lipson, "Cascaded silicon micro-ring modulators for WDM optical interconnection," Opt. Express 14, 9431-9435 (2006). [CrossRef] [PubMed]
  7. B. E. Little, J. S. Foresi, G. Steinmeyer, E. R. Thoen, S. T. Chu, H. A. Haus, E. P. Ippen, L. C. Kimerling, and W. Greene, "Ultra-compact Si-SiO2 microring resonator optical channel dropping filters," IEEE Photon. Technol. Lett. 10, 549-551 (1998). [CrossRef]
  8. M. A. Popovíc, T. Barwicz, M. R. Watts, P. T. Rakich, L. Socci, E. P. Ippen, F. X. Kärtner, and H. I. Smith, "Multistage high-order microring-resonator add-drop filters," Opt. Lett. 31, 2571-2573 (2006). [CrossRef] [PubMed]
  9. S. Xiao, M. H. Khan, S. Shen and M. Qi, "Silicon-on-insulator microring add-drop filters with free spectral ranges over 30 nm," submitted, IEEE J. Lightwave Technol.
  10. A. Vörckel, M. Mönster, W. Henschel, P. H. Bolivar, and H. Kurz, "Asymmetrically coupled silicon-on-insulator microring resonators for compact add-drop mutiplexers," IEEE Photon. Technol. Lett. 15, 921-923 (2003). [CrossRef]
  11. P. Dumon, W. Bogaerts, V. Wiaux, J. Wouters, S. Beckx, J. V. Campenhout, D. Taillaert, B. Luyssaert, P. Bienstman, D. V. Thourhout, and R. Baets, "Low loss SOI photonic wires and ring resonators fabricated with deep UV lithography," IEEE Photon. Technol. Lett. 16, 1328-1330 (2004). [CrossRef]
  12. V. Van, P. P. Absil, J. V. Hryniewicz and P. -T. Ho, "Propagation loss in single-mode GaAs-AlGaAs microring resonators: measurement and model," IEEE J. Lightwave Technol. 19, 1734-1739, (2001). [CrossRef]
  13. R. Grover, V. Van, T. A. Ibrahim, P. P. Absil, L. C. Calhoun, F. G. Johnson, J. V. Hryniewicz, and P. -T. Ho, "Parallel-cascaded semiconductor microring resonators for high-order and wide-FSR filters," IEEE J. Lightwave Technol. 20, 900-905, (2002). [CrossRef]
  14. D. Rafizadeh, J. P. Zhang, R. C. Tiberio, and S. T. Ho, "Propagation loss measurements in semiconductor microcavity ring and disk resonators," IEEE J. Lightwave Technol. 16, 1308-1314, (1998). [CrossRef]
  15. S. Zhen, H. Chen, and A. W. Poon, "Microring-resonator cross-connect filters in silicon nitride: rib waveguide dimension dependence," IEEE J. Sel. Top. Quantum Electron. 12, 1380-1387, (2006). [CrossRef]
  16. B. E. Little,  et al, "Microring resonator channel dropping filters," IEEE J. Lightwave Technol. 15, 998-1005 (1997). [CrossRef]

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