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

    MI.
    When the amplified pulse is passed through a fiber, it is initially compressed
    because of the frequency chirp imposed on it by the amplifier.

    lEEE JOURNAL OF QUANTUM ELECTRONICS. 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).52 pm
    mode-locked semiconductor laser, are in agreement with the theory.

    . 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. VOL 25.
    This feature can be used to compensate for fiber dispersion in optical
    communication systems. The experimental
    results, performed by using picosecond input pulses from a 1. 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
    این مطلب تا کنون 74 بار بازدید شده است.
    ارسال شده در تاریخ شنبه 30 مرداد 1395 [ گزارش پست ]
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آمار امروز پنجشنبه 2 آذر 1396

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