Journal of the Institute of Electronics Engineers of Korea SD (대한전자공학회논문지SD)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Rectangular ring resonator with optimum multimode inteference

최적의 다중모드 간섭기로 결합된 직사각형 링 공진기

  • Kim, Doo-Gun (School of Electronics and Electrical Eng., Chung-Ang University) ;
  • Choi, Woon-Kyung (School of Electronics and Electrical Eng., Chung-Ang University) ;
  • Choi, Young-Wan (School of Electronics and Electrical Eng., Chung-Ang University) ;
  • Yi, Jong-Chang (School of Electronics and Electrical Eng., Hong Ik University)
  • 김두근 (중앙대학교 전자전기공학부) ;
  • 최운경 (중앙대학교 전자전기공학부) ;
  • 최영완 (중앙대학교 전자전기공학부) ;
  • 이종창 (홍익대학교 전자전기공학부)
  • Published : 2007.11.25
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Abstract

We characterized the properties of the fabricated filter with the total internal reflection mirror (TIR) in the rectangular ring resonator and very small multimode interference (MMI) couplers on an InP material platform for photonic integrated circuits. Coupling power in and out of a resonator is increased by using an optimum MMI length of 110 ${\mu}m$ and a width of 9 ${\mu}m$, respectively. The semiconductor optical amplifier with the length of 120 ${\mu}m$ is integrated in the resonator to compensate the loss of the internal waveguide and the TIR mirror. A free spectral range of approximately 2 nm (244 GHz) is observed with an on-off ratio of 13 dB. The curve fitting also yields the power coupled per pass as 42%. To reach critical coupling at this coupling level would require a round trip loss of about 2.4 dB.

본 연구에서는 광집적회로를 구성하기 위해서 InP 기판위에 아주 작은 다중모드 간섭기를 결합기로 사용하고, 직사각형 링 공진기 내부는 전반사 거울로 구성된 필터를 제작하여 그 특성을 측정 분석하였다. 최적의 다중모드 간섭기의 길이와 폭은 110 ${\mu}m$와 9 ${\mu}m$로 하여 빛이 광 도파로를 따라 진행할 때 링으로 결합되는 파워를 높였다. 링 공진기 내부의 광도파로와 전반사 거울에서의 손실을 보상하기 위해서 링 공진기 내부에 길이가 120 ${\mu}m$인 반도체 광 증폭기를 집적하였다. 측정된 공진기의 FSR는 대략 2 nm (244 GHz)이고 소광비는 13 dB이다. 또한 곡선 피팅에 의해서 파워 결합력은 대략 42%를 얻을 수 있었다. 이러한 조건에서 임계 결합을 얻기 위해서는 2.4 dB의 공진기 내부 손실이 요구된다.

Keywords

References

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