서지주요정보
광섬유 테이퍼를 이용한 광섬유 소자 연구 = Fiber optic devices using fiber tapers
서명 / 저자 광섬유 테이퍼를 이용한 광섬유 소자 연구 = Fiber optic devices using fiber tapers / 송광용.
저자명 송광용 ; Song, Kwang-Yong
발행사항 [대전 : 한국과학기술원, 1998].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8008458

소장위치/청구기호

학술문화관(문화관) 보존서고

MPH 98016

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Fiber tapers have been essential elements in many fiber optic devices such as beam expanders, higher-order mode strippers, fused-type directional couplers. In this work, we demonstrate a novel application of fiber taper technique to realize mode selective polished type couplers. We constructed a fiber tapering system using a traveling burner and optimized the fabrication conditions such as gas flow rate and tapering speed to minimize the insertion loss of tapers. The insertion loss was less than 0.5% when a matched-cladding, single-mode fiber was tapered from 120㎛ down to 20㎛ in its diameter. As the first application of fiber taper, we made fused couplers by fusing and tapering a pair of identical single mode fibers at 1.55㎛. Any coupling ratio could be achieved by controlling the pulling length. The insertion loss was less than 2%. We also observed a number of interesting phenomena with highly-tapered couplers, such as the exponential decay of the coupling period as a function of the pulling length, polarization dependent coupling strength and cutoff of the antisymmetric supermode. As the second application, we demonstrated mode selective polished type couplers which couple the second order mode of a two mode fiber (TMF) and the fundamental mode of a single mode fiber (SMF). The matched SMF was easily prepared by tapering a given TMF and thereby changing its optical mode property. With this novel method, we could avoid the difficulty of getting a proper SMF. The optimum diameter of the tapered SMF was predicted by the optical waveguide theory and the coupled-mode theory. A mode selective coupler was made from a given TMF at 1.55㎛ with a 100㎛ diameter and its taper with 52㎛ diameter. The coupling ratio and mode extinction were 50% and -13dB, respectively. We are going to extend the novel method to realize fused type mode selective couplers in near future.

서지기타정보

서지기타정보
청구기호 {MPH 98016
형태사항 62 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Kwang-Yong Song
지도교수의 한글표기 : 김병윤
지도교수의 영문표기 : Byoung-Yoon Kim
학위논문 학위논문(석사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 59-62
주제 광섬유 광학
광섬유 테이퍼
광섬유 소자
용융형 방향성 결합기
모드 분할 방향성 결합기
이중 모드 광섬유
모드 결합
Fiber optics
Fiber taper
Fiber optic devices
Fused coupler
Mode selective coupler
Two mode fiber
Mode coupling
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