This paper analyzes the amplification of optical single-sideband signals, highlighting the significance of the optical signal bandwidth in determining signal-amplified spontaneous emission (ASE) beat noise. It predicts that an electrical noise figure of one may be realized for single-sideband signals using appropriate optical filtering. It verifies noise figure reduction experimentally, demonstrating an electrical noise figure of 1.1/spl times/ the spontaneous emission factor of the amplifier, which is 2.6 dB below the limit for conventional intensity modulated signals.
Griffin, R. A., Lane, PM., & O’Reilly, JJ. (1999). Optical amplifier noise figure reduction for optical single-sideband signals. Journal of Lightwave Technology, 17(10), 1793-1796. https://doi.org/10.1109/50.793752