noise figure (nf) meaning in English
噪声系数
Examples
- As the first stage of the system , its gain , noise figure ( nf ) and linearity directly take effect on the whole circuit
由于是整个电路系统的第一级,因此其增益,噪声,线性度等直接影响整个电路系统的性能。 - 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 、成功研制了掺铒光纤放大器,首次将高频co2激光脉冲写入的长周期光纤光栅应用到掺铒光纤放大器中作为自发辐射噪声滤波器,使edfa的增益提高了7db 、噪声系数降低了0 . 5db 。 - 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 )
与张瑞英博士一起，首次利用该种有源区结构制备出偏振不灵敏半导体光放大器，并在0 - 200ma注入电流范围内获得33nm的3db带宽，在不同信号波长，不同信号功率0 - 200ma的注入电流范围内，偏振相关损耗均《 0 . 9db ，在耦合差损为7db / facet的条件下，最大fiber - to - fiher增益达10db ，无损操作电流为50 - 70ma ，消光比达50db以上，而噪声指数则低于8db ，最小可达4 . 6db 。