Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
권호 표지
DOI QR코드

DOI QR Code

High-reflectivity Tunable Wavelength Filters Incorporating an Apodized Bragg Grating with a High-refractive-index Polymer Layer

고굴절률 폴리머층과 에포다이즈드 브래그 격자를 이용한 고반사 파장 필터

  • Kim, Eon-Tae (Department of Electronics Engineering, Pusan National University) ;
  • Park, Tae-Hyun (Department of Electronics Engineering, Pusan National University) ;
  • Huang, Guanghao (Department of Electronics Engineering, Pusan National University) ;
  • Oh, Min-Cheol (Department of Electronics Engineering, Pusan National University)
  • 김언태 (부산대학교 전자공학과 나노바이오광소자연구실) ;
  • 박태현 (부산대학교 전자공학과 나노바이오광소자연구실) ;
  • 황광호 (부산대학교 전자공학과 나노바이오광소자연구실) ;
  • 오민철 (부산대학교 전자공학과 나노바이오광소자연구실)
  • Received : 2017.07.27
  • Accepted : 2017.11.16
  • Published : 2017.12.25
Download PDF
⟨ Previous Next ⟩

Abstract

A tunable filter incorporating an apodized grating with a high-refractive-index polymer layer is demonstrated. In the apodized tunable filter, the reflectivity is decreased compared to that of a uniform grating, because of the gradually decreased grating depth. To increase the reflectivity of the apodized grating, a polymer of high refractive index is adopted for the apodized grating, and then high reflectivity is obtained while maintaining a narrow bandwidth. The apodized tunable filter exhibits a 3-dB bandwidth of 0.51 nm and a 20-dB bandwidth of 1.05 nm, with 98.5% reflection.

본 논문에서는 고굴절률 폴리머와 에포다이즈드 격자를 이용한 파장가변필터를 구현하였다. 기존의 에포다이즈드 브래그 격자는 격자의 깊이가 감소하는 부분이 있기 때문에 균일 분포 브래그 격자와 비교하였을 때 반사율이 낮아지게 된다. 이와 같은 문제점을 개선하기 위해서 에포다이즈드 격자 층에 고굴절률 폴리머를 삽입하면 좁은 대역폭을 유지하면서 높은 반사율을 얻을 수 있다. 제작된 파장 가변 필터의 반사율은 98.5%이며, 3-dB와 20-dB 대역폭은 각각 0.51 nm, 1.05 nm 이다.

Keywords

References

  1. D. Sadot and E. Boimovich, "Tunable optical filters for dense WDM networks," IEEE Commun. Mag. 36, 55-55 (1998).
  2. Y. Wang, H. Zhu, and B. Li, "Cascaded Mach-Zehnder interferometers assembled by submicrometer PTT wires," IEEE Photon. Technol. Lett. 21, 1115-1117 (2009). https://doi.org/10.1109/LPT.2009.2023675
  3. H. Yu, M. Chen, P. Li, S. Yang, H. Chen, and S. Xie, "Silicon-on-insulator narrow-passband filter based on cascaded MZIs incorporating enhanced FSR for downconverting analog photonic links," Opt. Express 21, 6749-6755 (2013). https://doi.org/10.1364/OE.21.006749
  4. K. McCallion, W. Johnstone, and G. Fawcett, "Tunable in-line fiber-optic bandpass filter," Opt. Lett. 19, 542-544 (1994). https://doi.org/10.1364/OL.19.000542
  5. K.-R. Sohn and J.-W. Song, "Thermooptically tunable sidepolished fiber comb filter and its application," IEEE Photon. Technol. Lett. 14, 1575-1577 (2002). https://doi.org/10.1109/LPT.2002.803875
  6. M. Strassner, C. Luber, A. Tarraf, and N. Chitica, "Widely tunable-constant bandwidth monolithic Fabry-Perot filter with a stable cavity design for WDM systems," IEEE Photon. Technol. Lett. 14, 1548-1550 (2002). https://doi.org/10.1109/LPT.2002.803876
  7. B. Yu, G. Pickrell, and A. Wang, "Thermally tunable extrinsic Fabry-Perot filter," IEEE Photon. Technol. Lett. 16, 2296-2298 (2004). https://doi.org/10.1109/LPT.2004.833890
  8. J. S. Milne, J. M. Dell, A. J. Keating, and L. Faraone, "Widely tunable MEMS-based Fabry-Perot filter," J. Microelectromech. Syst. 18, 905-913 (2009). https://doi.org/10.1109/JMEMS.2009.2024793
  9. M.-C. Oh, M.-H. Lee, J.-H. Ahn, H.-J. Lee, and S. G. Han, "Polymeric wavelength filters with polymer gratings," Appl. Phys. Lett. 72, 1559-1561 (1998). https://doi.org/10.1063/1.121114
  10. L. Eldada, S. Yin, C. Poga, C. Glass, R. Blomquist, and R. A. Norwood, "Integrated multichannel OADM's using polymer Bragg grating MZI's," IEEE Photon. Technol. Lett. 10, 1416-1418 (1998). https://doi.org/10.1109/68.720279
  11. G. Huang, J.-S. Shin, W.-J. Lee, T.-H. Park, W.-S. Chu, and M.-C. Oh, "Surface relief apodized grating tunable filters produced by using a shadow mask," Opt. Express 23, 21090-21096 (2015). https://doi.org/10.1364/OE.23.021090
  12. W.-J. Lee, G. Huang, J.-S. Shin, and M.-C. Oh, "Polymer waveguide apodized grating for narrow-bandwidth highreflectivity wavelength filters," Korean J. Opt. Photon. 26, 203-208 (2015). https://doi.org/10.3807/KJOP.2015.26.4.203
  13. M.-C. Oh, H.-J. Lee, M.-H. Lee, J.-H. Ahn, S.-G. Han, and H.-G. Kim, "Tunable wavelength filters with Bragg gratings in polymer waveguides," Appl. Phys. Lett. 73, 2543-2545 (1998). https://doi.org/10.1063/1.122527
  14. I.-S. In, H.-R. Park, S.-W. Lee, and M.-H. Lee, "Polymeric waveguides with bragg gratings in the middle of the core layer," J. Opt. Soc. Korea 13, 294-298 (2009). https://doi.org/10.3807/JOSK.2009.13.2.294
  15. Z. Zhang and N. keil, "Thermo-optic devices on polymer platform," Opt. Commun. 362, 101-114 (2015).