单项选择题
What is the difference between the transmitted power and the sensitivity of the receiver？ （）
A. OSNR B. dispersion C. attenuation D. power budget E. amplifier spacing F. four wave mixing
多项选择题 Whichthreetechnologiesareusedtoreducechromaticdispersionaccumulationinfiber-optictransmissionsystems？（）
单项选择题 Whyarethe1300nmand1550nmregionsofthefiberspectrumprimarilyusedforopticalcommunications？（）
多项选择题 Whatthreeincombinationarefactorsthatcancausefour-wavemixinginfiber-opticcables？（）
