서지주요정보
음향광학 파장 가변 대역투과 필터에 관한 연구 = Acousto-optic tunable bandpass filter
서명 / 저자 음향광학 파장 가변 대역투과 필터에 관한 연구 = Acousto-optic tunable bandpass filter / 이명수.
저자명 이명수 ; Lee, Myoung-Soo
발행사항 [대전 : 한국과학기술원, 2003].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8014630

소장위치/청구기호

학술문화관(문화관) 보존서고

DPH 03021

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

This dissertation describes a novel all-fiber acousto-optic tunable bandpass filter(AOTBF) based on the spatial mode coupling in an optical fiber. When compared to former bandpass filters based on Fabry-Perot etalon or fiber Bragg grating, this AOTBF has advantages of broad operating bandwidth and fast tuning by means of rf signal. The AOTBF has an acoustic transducer composed of PZT and a horn, and a core mode blocker in the middle of acousto-optic interaction region. A fundamental core mode at resonance wavelength is coupled to a cladding mode by a flexural acoustic wave generated by the acoustic transducer. The cladding mode passes through the core mode blocker with small transmission loss and is coupled back to the core mode. On the other hand, the uncoupled core mode at the wavelengths where the phase-matching condition is not satisfied is effectively removed by the core mode blocker. The core mode blocker, which selectively attenuates the core mode except cladding modes, is fabricated by fusion splicing two fibers whose end facets were etched with HF solution to construct an air bubble within the core of the fiber. When a conventional single mode fiber is used, the insertion loss and the extinction ratio of the AOTBF are about 1 dB and 12.5 dB respectively at the wavelength range of over 60 nm. The 3 dB bandwidth is about 3 nm for an interaction length of 20 cm. The insertion loss mainly comes from the cladding mode loss caused by the deformation of the fiber at the splicing point. The extinction ratio has a periodicity in the spectrum domain, which can be attributed to the interference coming from the air bubble of the core mode blocker. The on-off transition time is about 83 μs for an 18 cm-long AOTBF, which corresponds to the traveling time of the acoustic wave in the fiber. The return loss is about 47 dB. This AOTBF will be useful for the WDM channel monitoring, all-fiber optical spectrum analyzer, and a wavelength tunable fiber laser

서지기타정보

서지기타정보
청구기호 {DPH 03021
형태사항 iii, 76 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : 양방향 파장 선택적 광 Isolator (Bidirectional wavelength-selective optical lsolator
저자명의 영문표기 : Myoung-Soo Lee
지도교수의 한글표기 : 김병윤
지도교수의 영문표기 : Byoung-Yoon Kim
수록잡지명 : "Bidirectional wavelength-selective optical isolator". Electronics letters, v.37 no.14, pp.910-912(2001)
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 70-76
주제 음향광학
대역투과
필터
코어 모드 감쇠기
Acousto-Optic
Bandpass
Filter
core mode blocker
isolator
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