The use of optical fiber Raman University khuêch:a. low impurity concentration b. do not mix rare earth impuritiesc. Have higher impurity concentrations d. mixed rare earthThe great khuêch EDFA using fiber optics: a. low impurity concentration b. There is rare earth impurity phasec. Have higher impurity concentrations d. non-rare earth phaseIn optical transmission system does not use SOA make optical amplifiers because:a. large crosstalk b. Hard built, high pricec. capacity to draw high d. Only the amplifier are in the C band
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