High sensitivity optical pre-amplifier at 10Gbit/s employing a low noise composite EDFA with 46dB gain

We have demonstrated an optical preamplifier with a record sensitivity of -38.8dBm (102 photons/bit) at 10Gbit/s. When employed in a practical link the sensitivity is only slightly degraded to -37.6dBm (135 photons/bit) by input coupling losses and feedback due to Rayleigh backscattering.