고굴절률 폴리머층과 에포다이즈드 브래그 격자를 이용한 고반사 파장 필터
High-reflectivity Tunable Wavelength Filters Incorporating an Apodized Bragg Grating with a High-refractive-index Polymer Layer
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초록
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 같은문제점을 개선하기 위해서 에포다이즈드 격자 층에 고굴절률 폴리머를 삽입하면 좁은 대역폭을 유지하면서 높은 반사율을 얻을수 있다. 제작된 파장 가변 필터의 반사율은 98.5%이며, 3-dB와 20-dB 대역폭은 각각 0.51 nm, 1.05 nm 이다.
Abstract
A tunable filter incorporating an apodized grating with a high-refractive-index polymer layer is demonstrated. In the apodizedtunable 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, andthen high reflectivity is obtained while maintaining a narrow bandwidth. The apodized tunable filter exhibits a 3-dB bandwidthof 0.51 nm and a 20-dB bandwidth of 1.05 nm, with 98.5% reflection.
참고문헌 (15)
- D. Sadot, "Tunable optical filters for dense WDM networks", IEEE Commun. Mag, 36, pp.55~55 (1998)
- Y. Wang, "Cascaded Mach-Zehnder interferometers assembled by submicrometer PTT wires", IEEE Photon. Technol. Lett, 21, pp.1115~1117 (2009)
- H. Yu, "Silicon-on-insulator narrow-passband filter based on cascaded MZIs incorporating enhanced FSR for downconverting analog photonic links", Opt. Express, 21, pp.6749~6755 (2013)
- K. McCallion, "Tunable in-line fiber-optic bandpass filter", Opt. Lett, 19, pp.542~544 (1994)
- K.-R. Sohn, "Thermooptically tunable sidepolished fiber comb filter and its application", IEEE Photon. Technol. Lett, 14, pp.1575~1577 (2002)
- M. Strassner, "Widely tunable-constant bandwidth monolithic Fabry-Perot filter with a stable cavity design for WDM systems", IEEE Photon. Technol. Lett, 14, pp.1548~1550 (2002)
- B. Yu, "Thermally tunable extrinsic Fabry-Perot filter", IEEE Photon. Technol. Lett, 16, pp.2296~2298 (2004)
- J. S. Milne, "Widely tunable MEMS-based Fabry-Perot filter", J. Microelectromech. Syst, 18, pp.905~913 (2009)
- M.-C. Oh, "Polymeric wavelength filters with polymer gratings", Appl. Phys. Lett, 72, pp.1559~1561 (1998)
- L. Eldada, "Integrated multichannel OADM’s using polymer Bragg grating MZI’s", IEEE Photon. Technol. Lett, 10, pp.1416~1418 (1998)
- G. Huang, "Surface relief apodized grating tunable filters produced by using a shadow mask", Opt. Express, 23, pp.21090~21096 (2015)
- 이원준, "협대역 고반사 파장 필터 구현을 위한 폴리머 광도파로 에포다이즈드 격자", 한국광학회지, 26(4), pp.203~208 (2015), 한국광학회
- M.-C. Oh, "Tunable wavelength filters with Bragg gratings in polymer waveguides", Appl. Phys. Lett, 73, pp.2543~2545 (1998)
- 정인석, "Polymeric Waveguides with Bragg Gratings in the Middle of the Core Layer", Current Optics and Photonics, 13(2), pp.294~298 (2009), 한국광학회
- Z. Zhang, "Thermo-optic devices on polymer platform", Opt. Commun, 362, pp.101~114 (2015)