Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems? （）(Choose three.)

单项选择题What is the phenomenon called where different wavelengths of light travel at different speeds?（）

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

单项选择题A 2.5 Gb s (OC-48 or STM-16) optical signal with a dispersion tolerance of 1200 ps nm goes through fiber with 18ps nm*km of dispersion. How many 15216-DCU-350 equivalents are needed for enough compensation after traveling 100 km?（）

A.none
B.one
C.two
D.three
E.four

单项选择题Click the Exhibit button. What is the maximum allowable loss budget between the ONS 15216 Mux (left side) composite output and the ONS 15216 Demux (right side) composite input, with the optical values given in the exhibit? （）(Assume the worst case loss of 4.5 dB for 15216 200 GHz Mux Demux and ignore power penalties or extra margin.)

A.15dB
B.17dB
C.21dB
D.26dB
E.27dB

多项选择题What are two important considerations when using 2- or 4-channel 15216 OADMs?（） (Choose two.)

A. All "Add" channels require uniform power levels.
B. The flexibility of wavelengths per OADM is limited.
C. It is easier to balance "Pass-Through" and "Add" channels.
D. There is lower pass-through loss using multi-channel OADMs.
E. You can extract a single channel without dropping other channels.

单项选择题Click the Exhibit button. Given the following parameters: transmitter output (min): -2 dBm receiver input (min): -28 dBm 15216 Mux and Demux loss: 4.5 dB 16 channels maximum In which sites shown in the exhibit could the 15216 EDFAs be placed to minimize the number of EDFAs needed?（）

A. Locations B, C only
B. Locations A, B, C only
C. Locations A, B, D only
D. Locations B, C, D only
E. Locations A, B, C, D