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单项选择题

In the OSNR model for EDFA amplifiers， SNR OUT = 1/（1/SNR IN + FhvB/P IN ）， 
what does SNR IN represent？（）

A. the signal to noise of the current optical amplifier
B. the signal to noise of the previous amplifier or source
C. the signal to noise introduced by the optical multiplexer
D. the accumulated noise to signal ratio of the optical channel

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热门试题

单项选择题The dispersion of a non-zero dispersion shifted fiber is 6 ps nm*km at 1550 nm and 10 ps nm*km at 1610 nm.  What is the minimum dispersion compensation required if an L-Band DWDM signal travels through 200 km of fiber and has a dispersion tolerance of 1800 ps nm？（）

A. none
B. -600 ps/nm
C. -200 ps/nm
D. +200 ps/nm
E. +600 ps/nm

单项选择题Forlaserswithtightlycontrolledwavelengths，approximatelyhowfarapartarethecentersofadjacentwavelengthswhen100GHzspacingisusedinaDWDMsystem？（）

A. 0.4 nanometers
B. 0.6 nanometers
C. 0.8 nanometers
D. 1.2 nanometers
E. 1.6 nanometers

多项选择题Click the Exhibit button. Within an ONS 15454， you are provisioning a circuit on an unprotected SNCP ring. In the exhibit，  which two must you configure？（）

A. revertive
B. circuit size
C. circuit type
D. bidirectional
E. protected drops
F. Switch on PDI-P

多项选择题WhichthreetimingmodesaresupportedontheONS15454shelf？（）

A. line timing
B. loop timing
C. internal timing
D. through timing
E. external timing

单项选择题TheML-seriesEthernetcardontheONS15454providesupto（）activeQ-in-Qinstancespercard.

A. 512
B. 255
C. 1024
D. 4096