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
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
举一反三
- 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 noise B: -50dBm signal and -90dBm noise C: -30dBm signal and -90dBm noise D: -20dBm signal and -90dBm noise
- Which of the following cell signaling molecules does the neurotransmitter belong to? ( ) A: Chemical signal B: Gas molecules C: Optical signal D: Electric signal
- 光纤光栅的主要应用有哪些？ A: 光信号滤波器Optical signal filter B: 光信号分插复用器OADM C: 色散补偿器Dispersion compensator D: 光信号路由器Optical signal router E: 光纤光栅激光器Fiber grating laser
- Generally speaking, digital transmission can get higher signal quality than analog transmission, because? A: The repeater can regenerate digital pulses to remove signal distortion, and the amplifier amplifies the analog signal as well as the analog signal distorted B: Digital signals are smaller than analog signals and are not prone to distortion C: Analog signals are continuous and are not prone to distortion D: Digital signal is easier to sample than analog signal
- Noise includes: ____________ noise, ____________ noise, ____________noise and ____________noise.