多项选择题
What are three relevant design considerations when using the 15216 EDFA？（）
A. dispersion
B. Optical SNR
C. span attenuation
D. four wave mixing
E. receiver sensitivity
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A. 0 mW
B. 1 mW
C. 10 mW
D. 1.5 mW -
单项选择题
Whatisanadvantageofanexternallymodulatedlaseroveradirectlymodulatedlaser？（）
A. lower cost
B. higher chirp
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单项选择题
Whatisthephenomenoncalledwheredifferentwavelengthsoflighttravelatdifferentspeeds？（）
A. OSNR
B. dispersion
C. light skew
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