DOI QR코드

DOI QR Code

소멸비가 가변되는 폴리머 링 레조네이터

Polymeric Ring Resonator with Variable Extinction Ratio

  • Song, Ju-Han (Department of Electronic Engineering, Kwangwoon University) ;
  • Kim, Do-Hwan (Department of Electronic Engineering, Kwangwoon University) ;
  • Lee, Sang-Shin (Department of Electronic Engineering, Kwangwoon University)
  • 발행 : 2006.04.01

초록

공진 파장 대역에서의 소멸비가 전기적으로 조절되는 폴리머 링 레조네이터를 제안하고 구현하였다. 이 소자는 버스 도파로에 결합된 링 도파로와 링의 바깥 쪽 클래딩 영역에 형성된 전극으로 이루어져 있다. 전극에 전력이 인가되면 열광학 효과에 의하여 폴리머의 굴절률이 감소하여 링 도파모드의 구속이 강해지며, 이 모드가 느끼는 등가 유효굴절률이 감소하게 된다. 결과적으로 링의 전파손실이 감소하게 됨에 따라 레조네이터의 소멸비가 변하게 된다. 측정된 소자의 특성을 살펴보면, 전력을 12mW까지 인가함에 따라 소멸비는 약 9dB 정도 증가하였는데, 이것은 링 도파로의 전파손실이 약 80dB/cm 감소한 것에 해당된다.

A polymeric ring resonator with electrically variable extinction ratio at resonant wavelengths has been proposed and demonstrated. It consists of a ring waveguide coupled to a straight bus waveguide and a modulating electrode, which is formed in the outer cladding region outside of the ring. When electrical power is applied to the electrode, the refractive index of the polymers underneath the electrode is lowered to strengthen the confinement of the guided mode of the ring and thus the equivalent effective refractive index felt by the mode is decreased. Therefore, the propagation loss of the guided mode is reduced with the applied electrical power Consequently the extinction ratio at resonant wavelengths is varied by the electrical power. For the achieved results, the extinction ratio was changed by about 9 dB for the electrical power of 12 mW, when the propagation loss of the ring was reduced by 80 dB/cm.

키워드

참고문헌

  1. B. E. Little, 'Toward very large-scale integrated photonics,' Optics & Photonics News, pp. 24-29, Nov. 2000
  2. P. Rabiei, W. H. Steier, C. Zhang, and L. R. Dalton, 'Polymer micro-ring filters and modulators,' J. Lightwave Technol., vol. 20, no. 11, pp. 1968-1975, 2002 https://doi.org/10.1109/JLT.2002.803058
  3. Q. Xu, B. Schmidt, S. Pradhan, and M. Lipson, 'Micrometre-scale silicon electro-optic modulator,' Nature, vol. 435, pp. 325-327, May 2005 https://doi.org/10.1038/nature03569
  4. Do-Hwan Kim, Jung-Gyu Im, Seh-Won Ahn, Ki-Dong Lee, and Sang-Shin Lee, 'Polymeric microring resonator using nanoimprint technique based on a stamp incorporating a smoothing buffer Layer,' IEEE Photon. Technol. Lett., vol. 17, no. 11, pp. 2352-2354, 2005 https://doi.org/10.1109/LPT.2005.857606
  5. A. Yariv, 'Universal relations for coupling of optical power between microresonators and dielectric waveguides,' Electron. Lett., vol. 36, no. 4, pp. 321-322, 2000 https://doi.org/10.1049/el:20000340
  6. A. Yariv, 'Critical coupling and its control in optical waveguide-ring resonator systems,' IEEE Photon. Technol. Lett., vol. 14, no. 4, pp. 483-485, 2002 https://doi.org/10.1109/68.992585
  7. T. Kominato, Y. Hibino, and K. Onose, 'Silica-based finesse-variable ring resonator,' IEEE Photon. Technol. Lett, vol. 5, no. 5, pp. 560-562, 1993 https://doi.org/10.1109/68.215281
  8. G. N. Nielson, D. Seneviratne, F. Lopex-Royo, T. T. Rakich, Y. Avrahami, M. R. Watts, H. A. Haus, H. L. Tuller, and G. Barbastathis, 'Integrated wavelengthselective optical MEMS switching using ring resonator filters,' IEEE Photon. Technol. Lett., vol. 17, no. 6, pp. 1190-1192, 2005 https://doi.org/10.1109/LPT.2005.846951
  9. Ming-Chang M. Lee and Ming C. Wu, 'MEMSactuated microdisk resonators with variable power coupling ratios,' IEEE Photon. Technol. Lett, vol. 17, no. 5, pp. 1034-1036, 2005 https://doi.org/10.1109/LPT.2005.845772
  10. C. K. Madsen and J. H. Zhao, Optical Filter Design and Analysis: A Signal Procesing Approach. New York: Wiley, 1999
  11. T. Ito and Y. Kokubun, 'Nondestructive measurement of propagation loss and coupling efficiency in microring resonator filters using filter response,' Jap. J. Appl. Phys., vol. 43, no. 3, pp. 1002-1005, 2004 https://doi.org/10.1143/JJAP.43.1002