서지주요정보
미세 구부림을 이용한 장주기 광섬유 격자의 필터 특성 및 응용에 관한 연구 = Characterization and application of long period fiber grating based on microbends
서명 / 저자 미세 구부림을 이용한 장주기 광섬유 격자의 필터 특성 및 응용에 관한 연구 = Characterization and application of long period fiber grating based on microbends / 이상훈.
저자명 이상훈 ; Lee, Sang-Hoon
발행사항 [대전 : 한국과학기술원, 2000].
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등록번호

8010671

소장위치/청구기호

학술문화관(문화관) 보존서고

MPH 00021

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초록정보

This dissertation describes the fabrication, characterizations, and applications of long period fiber grating based on periodic microbends. A long period grating couples two different modes co-propagating in a fiber. In a single mode fiber, a long period grating couples fundamental mode to cladding modes that are absorbed by the jacket, resulting in a wavelength notch filter. Periodic microbends are induced on a fiber by electric arc. The process using electric arc has an advantage that it is simple and applicable to any type of fiber. The fabrication process was automated using a computer interface. The center wavelength, the depth, and the bandwidth of a grating were determined by controlling grating periods, arc strength, and the number of microbends, respectively. Bandwidth of 10~30nm and maximum rejection ratio of 25dB are typically achieved. The fabricated grating had polarization dependence originated from anti-symmetric microbends, and the maximum polarization dependent loss was 2.5dB. In order to achieve an arbitrary filter shape, the method of writing several periods on single grating was tested. As an application of long period grating, gain-flattening of erbium doped fiber(EDF) amplifier was demonstrated. The filter was composed of three long period gratings. The central wavelength and the depth of each grating were computed and designed to flatten output spectrum. When the filter was applied to EDF amplified spontaneous emission(ASE) source, the spectral ripple was reduced to 0.7dB from 5dB over 40nm wavelength range.

서지기타정보

서지기타정보
청구기호 {MPH 00021
형태사항 65 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Sang-Hoon Lee
지도교수의 한글표기 : 김병윤
지도교수의 영문표기 : Byoung-Yoon Kim
학위논문 학위논문(석사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 62-65
주제 장주기 격자
장주기 광섬유 격자
미세구부림
이득 평탄화
파장필터
Grating
Long period grating
Microbend
Gain flattening
Wavelength filter
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