多项选择题

Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems? （）(Choose three.)

A. PIN photodiodes
B. zero-chirped lasers
C. Erbium-doped fiber amplifiers
D. dispersion compensating fiber
E. dispersion compensating Bragg grating

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单项选择题

What is the phenomenon called where different wavelengths of light travel at different speeds?（）

A.OSNR
B.dispersion
C.light skew
D.attenuation

单项选择题

A 2.5 Gb s (OC-48 or STM-16) optical signal with a dispersion tolerance of 1200 ps nm goes through fiber with 18ps nm*km of dispersion. How many 15216-DCU-350 equivalents are needed for enough compensation after traveling 100 km?（）

A.none
B.one
C.two
D.three
E.four

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