单选题What is an advantage of an externally modulated laser over a directly modulated laser?（）Alower costBhigher chirpCeasier to manufactureDhigher dispersion toleranceEhigher optical signal-to-noise ratio
单选题
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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