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In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ), what does SNR IN represent?（）
- A、the signal to noise of the current optical amplifier
- B、the signal to noise of the previous amplifier or source
- C、the signal to noise introduced by the optical multiplexer
- D、the accumulated noise to signal ratio of the optical channel
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更多 “In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ), what does SNR IN represent?（）A、the signal to noise of the current optical amplifierB、the signal to noise of the previous amplifier or sourceC、the signal to noise introduced by the optical multiplexerD、the accumulated noise to signal ratio of the optical channel” 相关考题
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单选题Which signal and noise values will result in the best phone communication with an access point?（）A
signal strength 46dBm, noise level 95dBmB
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单选题In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ), what does SNR IN represent?（）A
the signal to noise of the current optical amplifierB
the signal to noise of the previous amplifier or sourceC
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the accumulated noise to signal ratio of the optical channel
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单选题As an experienced technician， you are responsible for Technical Support. A customer calls to askthe best signal level and noise level for cell phone. How to respond？（）A
-40dBm signal and -90dBm noiseB
-50dBm signal and -90dBm noiseC
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单选题信噪比（signal to noise ratio,SNR）是MRI最基本的质量参数，其正确的概念表述应为（）A
图像的亮度与暗度之比B
两个像素的信号强度之比C
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单选题In the OSNR model for EDFA amplifiers， SNR OUT = 1/（1/SNR IN + FhvB/P IN ）， what does SNR IN represent？（）A
the signal to noise of the current optical amplifierB
the signal to noise of the previous amplifier or sourceC
the signal to noise introduced by the optical multiplexerD
the accumulated noise to signal ratio of the optical channel
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单选题What is an advantage of an externally modulated laser over a directly modulated laser?（）A
lower costB
higher chirpC
easier to manufactureD
higher dispersion toleranceE
higher optical signal-to-noise ratio
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