Journal of the Korean Institute of Illuminating and Electrical Installation Engineers (조명전기설비학회논문지)

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
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Lyot-Type High-Order Fiber Comb Filter Based on Polarization-Diversity Loop Structure

편광 상이 루프 구조 기반 Lyot형 고차 광섬유 빗살 필터

  • 조송현 (부경대학교 전기공학과) ;
  • 김영호 (한국전기 연구원 나노융합기술 연구센터) ;
  • 이용욱 (부경대학교 전기공학과)
  • Received : 2013.05.31
  • Accepted : 2013.10.01
  • Published : 2013.12.31
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Abstract

In this paper, we propose a Lyot-type optical fiber comb filter based on a polarization-diversity loop structure (PDLS), which has flat-top pass bands and multiwavelength switching capability. Generally, the PDLS can remove the dependency of the filter on input polarization. The proposed filter is composed of a polarization beam splitter, two half-wave plates (HWPs), and two polarization-maintaining fiber loops concatenated with a $60^{\circ}$ offset between their principal axes. By controlling two HWPs, it can operate in a flat-top band mode or a lossy flat-top band mode with an inherent insertion loss of ~3.49dB. In particular, flat-top bands can be interleaved in both modes, which cannot be realized in a Lyot-Sagnac comb filter based on a fiber coupler. Compared with Solc-type high-order comb filters with the same order, the proposed filter shows sharper transition between pass and stop bands.

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References

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