Which of the following is incorrect regarding to the optical fiber Raman amplifier?

A、Ramanamplifiercanbeusedasabroadbandamplifiertoamplifymultipledifferentwavelengthssimultaneously;
B、Ramanamplifiercanbedirectlyusedtoincreasethecapacityoftheoriginalfiber,andthuscanreduceinvestment;
C、SpontaneousradiationnoiseoffiberRamanamplifierisbetterthanthatoferbium-dopedfiberamplifier;
D、FiberRamanamplifiercanonlyamplifysignalsataspecificwavelength