单项选择题
A. lower cost
B. higher chirp
C. easier to manufacture
D. higher dispersion tolerance
E. higher optical signal-to-noise ratio
单项选择题 What is the difference between the transmitted power and the sensitivity of the receiver?（）
多项选择题 Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems? （）(Choose three.)
单项选择题 What is the phenomenon called where different wavelengths of light travel at different speeds?（）