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    • 6. 发明授权
    • Method and apparatus for monitoring noise figure of optical amplifier
    • 用于监测光放大器噪声系数的方法和装置
    • US5471334A
    • 1995-11-28
    • US139227
    • 1993-10-19
    • Hiroji MasudaKazuo AidaKiyoshi Nakagawa
    • Hiroji MasudaKazuo AidaKiyoshi Nakagawa
    • H04B10/073H04B10/077H04B10/079H04B10/291H04B17/00
    • H04B10/0731H04B10/077H04B10/07955H04B10/291H04B2210/003
    • A method and an apparatus for monitoring the noise figure of an optical amplifier such as used in linear repeaters in an optical transmission system formed by cascaded linear repeaters. The apparatus includes at least one optical amplifier for amplifying input signal light and a narrow bandwidth optical filter for removing amplified spontaneous emission (ASE) light generated at the optical amplifier. A gain detector is provided to detect the gain of the optical amplifier and an ASE optical power detector detects an optical power of the ASE light generated at the optical amplifier. The apparatus includes a splitter for splitting light entering into the narrow bandwidth optical filter and a local oscillator for generating local light having a wavelength displaced from a wavelength of the input signal light. The light split by the splitter is coupled with the local light generated by the local oscillator. An optical power detector makes a heterodyne detection of the optical power of the coupled light. An electrical band-pass filter extracts the optical power of the ASE light generated by the optical amplifier from the optical power obtained by the optical power detector. A noise figure calculator calculates the noise figure according to the gain detected by the gain detector and the optical power of the ASE light detected by the ASE optical power detector.
    • 一种用于监测光放大器的噪声系数的方法和装置,例如在由级联线性转发器形成的光传输系统中用于线性中继器中。 该装置包括用于放大输入信号光的至少一个光放大器和用于去除在光放大器处产生的放大的自发发射(ASE)光的窄带宽滤光器。 提供增益检测器来检测光放大器的增益,并且ASE光功率检测器检测在光放大器处产生的ASE光的光功率。 该装置包括用于分离进入窄带宽滤光器的光的分离器和用于产生具有从输入信号光的波长偏移的波长的局部光的本地振荡器。 由分路器分开的光与由本地振荡器产生的局部光耦合。 光功率检测器对耦合光的光功率进行外差检测。 电带通滤波器从由光功率检测器获得的光功率中提取由光放大器产生的ASE光的光功率。 噪声系数计算器根据由增益检测器检测的增益和由ASE光功率检测器检测到的ASE光的光功率计算噪声系数。