单项选择题

What is an advantage of an externally modulated laser over a directly modulated laser？（）

A. lower cost
B. higher chirp
C. easier to manufacture
D. higher dispersion tolerance
E. higher optical signal-to-noise ratio

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单项选择题

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

单项选择题

A. amplifier
B. attenuator
C. regenerator
D. light emitter
E. optical switch
F. optical receiver
G. fiber-optic cable

单项选择题

A. OSNR
B. dispersion
C. attenuation
D. power budget
E. amplifier spacing
F. four wave mixing

What is an advantage of an externally modulated laser over a directly modulated laser？ （）