서지주요정보
4분기 광도파로를 이용한 1x4 광파워분할기와 열광학스위치 = Optical power divider and thermo-optic switch based on a 4-branch waveguide
서명 / 저자 4분기 광도파로를 이용한 1x4 광파워분할기와 열광학스위치 = Optical power divider and thermo-optic switch based on a 4-branch waveguide / 송현채.
저자명 송현채 ; Song, Hyun-Chae
발행사항 [대전 : 한국과학기술원, 2000].
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등록번호

8010632

소장위치/청구기호

학술문화관(문화관) 보존서고

DEE 00027

SMS전송

도서상태

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초록정보

A multi-branch waveguide may be a solution to reduce the dimensions of optical power dividers and optical space switches. In this thesis an optical power divider and an optical switch based on a four-branch waveguide structure are proposed and fabricated for the first time. The proposed four-branch optical power divider has one beam separator and two beam expanders in the branching region of a four-branch waveguide. The uniform output power distribution can be obtained by adjusting the sizes of the beam separator and the beam expander. To demonstrate the proposed power divider, the four-branch waveguide with a beam separator and two beam expanders is fabricated. Benzocyclobutene (BCB) and UV-curable epoxy are used as core and cladding layers, respectively. The measured powers of four output ports are uniform for both TE and TM modes within the difference of 0.3 dB. A 1x4 thermo-optic switch based on the four-branch waveguide is proposed and fabricated. The proposed switch consists of a four-branch waveguide and four electrodes on the top of branches. The operation of this device is based on the adiabatic mode evolution in branch waveguides with a small angle of separation. If three among four electrodes are heated, the effective refractive indices of waveguides are decreased in the heated branches. Thus the input light is eventually coupled into the unheated branch that has an effective refractive index relatively higher than the other branches. The proposed four-branch thermo-optic switch is fabricated by using the standard photolithography and reactive ion etching. Polyimides with the refractive index difference of 1.2 % are used as materials of core and cladding layers. The fabricated device has the crosstalk of -14 dB or less, and its switching power is about 1200 mW. However, this four-branch thermo-optic switch has a problem that driving powers in the switching states are different from each other; the power consumption for the inner output port is more than twice as large as that for the outer output port. To solve this problem unequal width heaters and the waveguide structure with a thin overcladding layer are proposed in a four- branch thermo-optic switch. This structure is fabricated with the polymer materials with high index difference, BCB and PFCB. Polarization-independent and wavelength-insensitive operation is demonstrated at the wavelength of 1.3 ㎛ and 1.5 ㎛. And the measured characteristics exhibit the smaller difference in the power consumption between the switching states and the driving power less than the previous four-branch thermo-optic switch with equal width heaters. As for the device performance, the crosstalk is better than -15 dB at about 170~190 mW, the insertion loss is 7.2 ~ 7.8 dB, and the switching time is less than 0.76 ms.

서지기타정보

서지기타정보
청구기호 {DEE 00027
형태사항 v, 122 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Hyun-Chae Song
지도교수의 한글표기 : 신상영
지도교수의 영문표기 : Sang-Yung Shin
수록잡지명 : "Four-branch single-mode waveguide power divider". Photonics technology letters, vol. 10, no. 12, pp. 1760-1762 (1998)
학위논문 학위논문(박사) - 한국과학기술원 : 전기및전자공학전공,
서지주기 Reference : p. 118-122
주제 집적광학
폴리머
광분배기
열광학스위치
Integrated optics
Polymer
Power divider
Thermo-optic switch
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