خوش آمدید

جستجو

تبلیغات





Self-Phase Modulation and Spectral Broadening of Optical Pulses in Semiconductor Laser Amplifiers

    lEEE JOURNAL OF QUANTUM ELECTRONICS. VOL 25. MI. 1 1 . NOVkMRFR IYX9

    --------------------------------------

    Abstract-Amplification of ultrashort optical pulses in semiconductor
    laser amplifiers is shown to result in considerable spectral broadening
    and distortion as a result of the nonlinear phenomenon of self-phase
    modulation (SPM). The physical mechanism behind SPM is gain saturation
    which leads to intensity-dependent changes in the refractive
    index in response to variations in the carrier density. The effect of the
    shape and the initial frequency chirp of input pulses on the shape and
    the spectrum of amplified pulses is discussed in detail. Particular attention
    is paid to the case in which the input pulsewidth is comparable
    to the carrier lifetime so that the saturated gain has time to recover
    partially before the trailing edge of the pulse arrives. The experimental
    results, performed by using picosecond input pulses from a 1.52 pm
    mode-locked semiconductor laser, are in agreement with the theory.
    When the amplified pulse is passed through a fiber, it is initially compressed
    because of the frequency chirp imposed on it by the amplifier.
    This feature can be used to compensate for fiber dispersion in optical
    communication systems.


    این مطلب تا کنون 17 بار بازدید شده است.
    منبع
    برچسب ها : pulses ,input ,input pulses ,frequency chirp ,
    Self-Phase Modulation and Spectral Broadening of Optical Pulses in Semiconductor Laser Amplifiers

تبلیغات


    محل نمایش تبلیغات شما

پربازدیدترین مطالب

آمار

تبلیغات

محل نمایش تبلیغات شما

تبلیغات

محل نمایش تبلیغات شما

آخرین کلمات جستجو شده