서지주요정보
정현파 전류로 변조된 단일모드 반도체 레이저의 비선형 특성 = Nonlinear characteristics of a single-mode semiconductor laser modulated by the sinusoidal current
서명 / 저자 정현파 전류로 변조된 단일모드 반도체 레이저의 비선형 특성 = Nonlinear characteristics of a single-mode semiconductor laser modulated by the sinusoidal current / 조성대.
저자명 조성대 ; Cho, Seong-Dae
발행사항 [대전 : 한국과학기술원, 1999].
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등록번호

8010278

소장위치/청구기호

학술문화관(문화관) 보존서고

DEE 99080

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초록정보

The nonlinear characteristics of a single-mode semiconductor laser have been studied to investigate the limit of optical pulse width in a sinusoidally modulated semiconductor laser and the parametric amplification of a small signal current in a semiconductor laser. The minimum obtainable optical pulse width and its limiting mechanism in a directly modulated semiconductor laser are important to select a proper laser diode and to provide information for the development of short optical pulse laser diodes. Though there have been many efforts to investigate the minimum obtainable optical pulse width in gain-switched semiconductor laser, there still remains some controversy over the minimum obtainable optical pulse width. The minimum obtainable optical pulse width is determined by either the period doubling or the saturation of modulation efficiency. The shift of the resonance frequency to the lower frequency side with increase of the modulation current brings about these phenomena. It is predicted theoretically that the minimum obtainable pulse width is about 0.2 times the period of the small signal resonance. The minimum pulse width after compression with a dispersion compensating fiber is about 0.04 times the period of the small signal resonance when the linewidth enhancement factor is 7. Experimental measurements are in good agreement with the theory. When the shifted resonance frequency is about one half of the pump modulation current frequency, we can amplify a signal whose frequency is near the shifted resonance frequency by using the parametric process. The parametric gain and its saturation characteristics are both experimentally and theoretically investigated as a function of the pump modulation current, the signal modulation current, and the modulation frequency. The experimental results agree well with the numerical calculations based on the rate equations. Also, the parametric amplification is investigated analytically by applying the multiple scale method to the rate equations. We may obtain the parametric gain of 10 dB. The parametric gain depends on the phase difference between the signal and the pump modulation current. The phase difference between them for 3 dB-gain reduction is about 120 degree.

서지기타정보

서지기타정보
청구기호 {DEE 99080
형태사항 iv, 106 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Seong-Dae Cho
지도교수의 한글표기 : 신상영
공동교수의 한글표기 : 이창희
지도교수의 영문표기 : Sang-Yung Shin
공동교수의 영문표기 : Chang-Hee Lee
학위논문 학위논문(박사) - 한국과학기술원 : 전기및전자공학과,
서지주기 참고문헌 수록
주제 반도체 레이저
이득 스위칭
광 펄스폭
매개 이득
비선형 특성
Semiconductor laser
Gain-switching
Optical pulsewidth
Parametric gain
Nonlinear characteristics
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