If the power is 0 dBm， what is the power in mW？（）

单项选择题Whatisanadvantageofanexternallymodulatedlaseroveradirectlymodulatedlaser？（）

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Whatisthephenomenoncalledwheredifferentwavelengthsoflighttravelatdifferentspeeds？（）

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

单项选择题WhichdevicecreatesanOEOconversion？（）

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

单项选择题Whatisthedifferencebetweenthetransmittedpowerandthesensitivityofthereceiver？（）

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

多项选择题Whichthreetechnologiesareusedtoreducechromaticdispersionaccumulationinfiber-optictransmissionsystems？（）

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