Impact of optical preamplifier beat noise on inter-satellite coherent optical communication system

The performance of Inter-Satellite coherent optical communication systems is partly limited by the beat noise between the amplified spontaneous emission (ASE) noises and local oscillator. In order to improve the optical detection sensitivity in inter-satellite optical communication links, a model of inter-satellite coherent optical communication is established. And the origin of noise in this system with optical pre-amplifier is investigated. The impact of optical pre-amplifier key parameters on performance of inter-satellite coherent optical communication systems is discussed. Besides, bit error rate (BER) versus signal power, noise figure and gain are numerically calculated. The results illustrated that it is effective to improve the optical detection sensitivity and degrade the bit error rate using an optical pre-amplifier with low noise figure.