noise figure (nf) 中文意思是什麼

noise figure (nf) 解釋
噪聲系數
  • noise : n 1 聲音，聲響。2 叫喊；嘈雜聲，噪音；喧鬧聲；吵鬧，騷動，騷擾。3 〈古語〉謠言，風聲。4 〈美國〉...
  • figure : n 1 外形，形狀，外觀；姿態。2 畫像，塑像。3 圖形，圖案；插圖；圖表。4 人影，人形；人物。5 風度，...
  1. In order to measure the characteristics of such semiconductor optical amplifier, we adopted a set of measurement system. this measurement system can be used to measure the characteristics of all kinds of active or inactive optical passive components. such device presents good polarization insensitivity ( < 0. 9db ), wide 3db bandwidth ( > 33nm ) at 0 - 200ma and different input signal light wavelength and power, the maximum fiber - to - fiber gain of 10db, lossless operation current of 50 - 75ma for different input signal light wavelength and power, large extinction ratio ( > 50db ) and lower noise figure ( nf ) ( < 8db )

    與張瑞英博士一起，首次利用該種有源區結構制備出偏振不靈敏半導體光放大器，並在0 - 200ma注入電流范圍內獲得33nm的3db帶寬，在不同信號波長，不同信號功率0 - 200ma的注入電流范圍內，偏振相關損耗均《 0 . 9db ，在耦合差損為7db / facet的條件下，最大fiber - to - fiher增益達10db ，無損操作電流為50 - 70ma ，消光比達50db以上，而噪聲指數則低於8db ，最小可達4 . 6db 。
  2. 4. the lpfgs are used in single wavelength er - doped fiber amplifiers ( edfas ) as a spontaneous emission noise ( ase ) filter, and the gain of the edfa is increased by 7db and the noise figure ( nf ) is decreased by 0. 5db, for the first time

    4 、成功研製了摻鉺光纖放大器，首次將高頻co2激光脈沖寫入的長周期光纖光柵應用到摻鉺光纖放大器中作為自發輻射噪聲濾波器，使edfa的增益提高了7db 、噪聲系數降低了0 . 5db 。
  3. As the first stage of the system, its gain, noise figure ( nf ) and linearity directly take effect on the whole circuit

    由於是整個電路系統的第一級，因此其增益，噪聲，線性度等直接影響整個電路系統的性能。
  4. Based on the above background and under the support of tianjin natural science foundation project : intelligent fiber amplifiers and light sources, tianjin natural science foundation project : ( c + l ) broadband fiber amplifier and nankai - delta ( tianjin ) project : development of gain flattened erbium - doped fiber amplifiers, this dissertation is mainly focused on the study of novel gc - edfa, gain and nf ( noise figure ) improvement of edfa, light sources, multi - wavelength fiber laser and voa ( variable optical attenuator )

    基於以上背景，在天津市重點基金項目? ?智能型光纖放大器和光源的研究、天津市重點基金項目? ? （ c + l ）超寬帶摻雜光纖放大器和南開-達爾泰（天津）項目? ?開發增益平坦的摻鉺光纖放大器的支持下，本論文主要圍繞新型gc - edfa 、 edfa性能的優化、增益控制用光源、多波長光纖激光器以及可調光衰減器等課題進行了理論和實驗研究。
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