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http://dx.doi.org/10.3807/KJOP.2003.14.5.545

Traveling-wave Ti:LiNbO3 optical modulator capable of complete switching  

곽재곤 (서울시립대학교 전자전기컴퓨터공학부)
김경암 (서울시립대학교 전자전기컴퓨터공학부)
김영문 (서울시립대학교 전자전기컴퓨터공학부)
정은주 (서울시립대학교 전자전기컴퓨터공학부)
피중호 (서울시립대학교 전자전기컴퓨터공학부)
박권동 (서울시립대학교 전자전기컴퓨터공학부)
김창민 (서울시립대학교 전자전기컴퓨터공학부)
Publication Information
Korean Journal of Optics and Photonics / v.14, no.5, 2003 , pp. 545-554 More about this Journal
Abstract
Design of the optical modulator composed of a three-waveguide coupler and CPW traveling-wave electrodes was carried out. Switching phenomena of three-waveguide couplers were analyzed by using the coupled mode theory, and the coupling-lengths of the devices were calculated by means of the FDM. CPW traveling-wave electrodes were analysed by the CMM and SOR simulation technique in order to find the conditions of phase-velocity and impedance matching. Traveling-wave modulators were fabricated on z-cut LiNbO$_3$ substrate. Ti was in-diffused in LiNbO$_3$ to make waveguides and Au electrodes were built on the waveguides by the electrolyte technique. The fabricated modulator chip was end-polished, pig-tailed and packaged in a brass mount with K-connector. The insertion loss and the switching voltage of the optical modulator were about 4㏈ and 19V, respectively. Network analyzer was used to obtain the S parameter and the corresponding RF response. From the measurement, parameters of the traveling-wave electrodes were extracted to be Z$_{c}$= 45 Ω, N$_{eff}$=2.20, and $\alpha$$_{0}$=0.055/cm√GHZ. The measured optical response R($\omega$) was compared with the theoretically estimated one, showing both responses agree well. The measurement results revealed that 3㏈ bandwidth turned out to be about 13 GHz.
Keywords
optical modulator; directional coupler;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
연도 인용수 순위
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