单项选择题

A.Turning the laser to a specific ITU channelB.Keeping ……

In optical transmission systems， chirped lasers are used for the purpose of：（）.

A.Turning the laser to a specific ITU channel
B.Keeping the signal wavelength "locked" to a specific technology
C.Suppressing FWM and SBS non-linear effects
D.None ofthe above

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