Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Design and fabrication of temperature-independent AWG-WDM devices using polymer overcladding

폴리머 상부클래드를 이용한 온도무의존 AWG 파장분할 다중화 소자의 설계 및 제작

  • 한영탁 (한국전자통신연구원 집적광모듈팀) ;
  • 김덕준 (한국전자통신연구원 집적광모듈팀) ;
  • 신장욱 (한국전자통신연구원 집적광모듈팀) ;
  • 박상호 (한국전자통신연구원 집적광모듈팀) ;
  • 박윤정 (한국전자통신연구원 집적광모듈팀) ;
  • 성희경 (한국전자통신연구원 집적광모듈팀)
  • Published : 2003.04.01
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Abstract

In arrayed waveguide grating (AWG) devices whose waveguides were composed of polymer with negative thermo-optic coefficient as overcladding, and silica with positive thermo-optic coefficient as both core and undercladding, we investigated the temperature dependence of the central wavelength using two-dimensional SFDM. From these results, it was confirmed that the temperature dependence can be nearly eliminated by adjusting the refractive index of the cladding and the thickness of the silica thin film upper-loaded on the core. Based on the numerical calculations, the AWG device with polymer overcladding was fabricated. and its optical characteristics were compared with those of the orginal silica AWG device. The introduction of polymer overcladding decreased the temperature dependence of the central wavelength from 0.0130 nm/$^{\circ}C$ to 0.0028 nm/$^{\circ}C$ without deteriorating the insertion loss and crosstalk characteristics.

양의 열광학 계수를 갖는 실리카를 하부클래드 및 코아에 그리고 음의 열광학 계수를 갖는 폴리머를 상부클래드에 적용한 AWG(Arrayed Waveguide Grating) 파장분할 다중화 소자에 대하여 이차원 스칼라 유한차분법(Scalar Finite Difference Method; SFDM)으로 온도의존 특성을 분석한 결과, 클래드의 굴절률을 변화시키거나 실리카 코어 상부에 실리카 박막이 존재하는 구조에서 박막의 두께를 변화시켜 온도의존 특성을 조절할 수 있음을 확인하였다. 이러한 해석결과에 근거하여 폴리머 상부클래드가 적용된 AWG 소자를 제작하였으며 기존의 실리카 AWG 소자와 특성을 비교분석하였다. 폴리머 상부클래드의 도입에 의해 삽입손실 및 크로스톡은 큰 변화가 없었으나 중심파장의 온도의존성은 0.0130 nm/$^{\circ}C$에서 0.0028 nm/$^{\circ}C$ 수준으로 감소하였다.

Keywords

References

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