NOISELESS INDEPENDENT SIGNAL AND POWER AMPLIFICATION

We present a noiseless optical amplifier comprising a signal-amplifyin g feed-forward loop and a power-amplifying injection-locked laser. We demonstrate that the signal amplifier can attain a signal-transfer coe fficient limited solely by the quantum efficiency of our in-loop photo detector and that we can independently amplify the optical power while leaving the normalized intensity-noise spectral density of the input field unchanged. (C) 1998 Optical Society of America.