Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
권호 표지
DOI QR코드

DOI QR Code

Wavelength-division multiplexing channel isolation filter using a side-polished fiber coupler

측면 연마 광섬유 결합기를 이용한 파장분할 다중화 채널분리 필터

  • 손경락 (구미 기능대학 정보통신시스템학과) ;
  • 김광택 (호남대학교 광전자공학과) ;
  • 송재원 (경북대학교 전자전기컴퓨터학부)
  • Published : 2002.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

Fiber-optic comb filters using a side-polished fiber coupler are proposed as multi-channel isolation filters on wavelength division multiplexing systems. We have demonstrated that the coupling efficiency between two waveguides is improved by the intermediate coupling layer in spite of the decrease of the optical power transfer between two waveguides due to the high-order modes of the overlay waveguide coupled with the side-polished single-mode fiber. When LiNbO$_3$with a 200-${\mu}{\textrm}{m}$-thickness was applied as a planar-overlay-waveguide, the comb filtering characteristics with a 4 nm-channel-spacing were achieved and the maximum power coupling occurred at the 1-${\mu}{\textrm}{m}$-thickness and the refractive index in range 1.52 to 1.53 of an intermediate coupling layer. If the intermediate coupling layer is optimized, an extinction ratio with more than 20 dB can be obtained. These experimental results are in good agreement with the BPM simulation.

파장분할 다중화 시스템의 다중 채널분리 필터가 측면연마 광섬유 결합기를 이용한 빗살필터로 구현됨을 제안하였다 단일 모드 광섬유의 기본모드와 결합하는 상부 평면 도파로의 모드가 고차일수록 광 전력전달 효율은 낮아지는데, 두 도파로 사이 에 중간 결합층을 삽입함으로서 개선시킬 수 있고 최적화 조건에서 20dB 이상의 채널간 소멸비를 얻을 수 있음을 보였다. 200fm두께의 리튬나오베이트를 상부 평면 도파로로 적용한 경우 4m의 채널간격을 가지는 빗살필터 특성을 얻었으며, 중간 결합층의 두께가 1 Um일 때 굴절률이 1.52-1.53 범위에서 최대 광 전력전달이 일어남을 관측하였고 빔 전파 방법을 이용하여 계산한 결과와 거의 일치함을 보였다.

Keywords

References

  1. Proc. of the IEEE v.85 no.8 Optical components for WDM lightwave networks M. S. Borella;J. P. Jue;D. Banerjee;B. Ramamurthy;B. Mukherjee https://doi.org/10.1109/5.622506
  2. European Conf. on Opt. Commun. v.2 Multiple-passband in-fiber moire resonators fabricated using nearfield holography with a chirped phase mask L. A. Everall;K. Sugden;J. A. R. Williams;X. Liu;J. S. Aitchison;I. Bennion;R. M. De La Rue
  3. Opt. Lett. v.23 no.7 Wavelength-division multiplexing isolation fiber filter and light source using cascaded long-period fiber gratings X. J. Gu https://doi.org/10.1364/OL.23.000509
  4. Opt. Commun. v.169 Multi-wavelength operation of an erbium-doped fiber ring laser using a dual-pass Mach-Zehnder comb filter H. L. An;X. Z. Lin;E. Y. B. Pun;H. D. Liu https://doi.org/10.1016/S0030-4018(99)00422-8
  5. Opt. Lett v.19 no.8 Tunable in-line fiber-optic bandpass filter K. McCallion;W. Johnstone;G. Fawcett https://doi.org/10.1364/OL.19.000542
  6. 한국광학회지 v.10 no.5 광섬유 평면도파로 광 결합기를 이용한 광필터 제작과 특성 측정 김광택;이소영;손경락;이종훈;송재원;이상재;김시홍;강신원
  7. IEEE Photon. Technol. Lett. v.8 no.3 Continuous-fiber modulator with high-bandwidth coplanar strip electrodes S. Creaney;W. Johnstone;K. McCallion https://doi.org/10.1109/68.481115
  8. Jpn. J. Appl. Phys. v.37 Low-voltage optical fiber switch S. M. Tseng;C. L. Chen https://doi.org/10.1143/JJAP.37.L42
  9. 한국광학회지 v.13 no.2 금속 클래드 평면 도파로와 결합된 측면 연마 광섬유의 파장 및 편광 선택성 황중호;이준옥;김철호;황보승;김광택;마재평;손경락;송재원 https://doi.org/10.3807/KJOP.2002.13.2.134
  10. Appl. Opt. v.29 no.21 Optical Amplification of a multimode evanescently active planar optical waveguide W. Y. Liu;O. M. Stafsudd https://doi.org/10.1364/AO.29.003114
  11. Opt. Commun. v.203 Tunable fiber optic comb filter using a side-polished single mode fiber coupler with LiNbO₃overlay and intermediate coupling layer K. R. Sohn;J. W. Song https://doi.org/10.1016/S0030-4018(02)01178-1
  12. Opt. Commun. v.180 Polarizing properties of optical coupler composed of single mode side-polished fiber and multimode metal-clad planar waveguide K. T. Kim;H. W. Kwon;J. W. Song;S. Lee;W. G. Jung;S.W. Kang https://doi.org/10.1016/S0030-4018(00)00646-5
  13. J. Opt. Soc. Am. B v.11 Distributed coupling between a single-mode fiber and a planar waveguide K. P. Panajotov;A. T. Andreev https://doi.org/10.1364/JOSAB.11.000826