Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Hybrid-integrated Tunable Laser Using Polymer-ring Resonator-based Add/Drop Filter Reflector and Reflective Semiconductor Optical Amplifier

폴리머 링 공진기 기반의 가감필터 반사기와 반사형 반도체 광 증폭기가 하이브리드 집적된 파장 가변 레이저

  • Lee, Ho (Department of Electronics and Communications Engineering, Kwangwoon University) ;
  • Kim, Gun-Woo (Department of Electronics and Communications Engineering, Kwangwoon University) ;
  • Chung, Young-Chul (Department of Electronics and Communications Engineering, Kwangwoon University) ;
  • Kim, Su-Hyun (Korea Institute of Science and Technonlogy)
  • 이호 (광운대학교 전자통신공학과) ;
  • 김건우 (광운대학교 전자통신공학과) ;
  • 정영철 (광운대학교 전자통신공학과) ;
  • 김수현 (한국과학기술연구원)
  • Published : 2009.08.25
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Abstract

In this paper, a low-cost hybrid-integrated tunable laser is realized using a polymer-ring resonator-based add/drop filter reflector and a reflective semiconductor optical amplifier. The add/drop filter reflector, composed of a double-ring resonator with different radii, can have characteristics of selective wavelength reflection and wide wavelength tuning with an aid of vernier effect derived from the radii difference. By hybrid-integrating the reflective semiconductor optical amplifier with the add/drop filter reflector, a tunable laser can be realized through an active alignment method. The hybrid laser exhibited a single mode lasing with side mode suppression ratio of 26 dB and full width half maximum of 0.03 nm. In addition, applying a low current as small as 25 mA onto electrodes over add/drop filter reflector, a wavelength tuning range of 17 nm could be obtained.

본 논문에서는 고굴절률차 폴리머 도파로를 이용하여 이중 링 공진기 가감필터(Add/Drop Filter) 반사기를 설계하고 제작하였다. 이 가감필터 반사기를 반사형 반도체 광 증폭기와 하이브리드 집적함으로써 저가형 파장가변 레이저를 제작하고 그 측정결과를 분석하였다. 이중 링 공진기 반사기는 서로 다른 반경을 가진 두 개의 링 공진기로 인하여 선택적인 반사 특성을 가지게 되며, 버니어 효과로 인하여 넓은 파장가변 특성을 가질 수 있다. 반사형 반도체 광 증폭기와 능동 정렬을 통하여 제작된 하이브리드 집적 파장가변 레이저는 26 dB의 부 모드 억제율과 0.03 nm의 선폭을 가지며 단일 모드로 발진하였다. 또한 25 mA의 전류를 이중 링 공진기 가감필터 반사기 상부에 형성된 전극에 인가하여 총 17 nm의 파장가변을 측정하였으며, 파장가변 과정에서 부 모드 억제율은 일정하게 유지됨을 확인하였다.

Keywords

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