Polishuk Anna, Arnon Shlomi
Satellite and Wireless Communication Laboratory, Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, P.O. Box 653, IL-84105, Beer-Sheva, Israel.
J Opt Soc Am A Opt Image Sci Vis. 2004 Jul;21(7):1307-15. doi: 10.1364/josaa.21.001307.
We derive a model that optimizes the performance of a laser satellite communication link with an optical preamplifier in the presence of random jitter in the transmitter-receiver line of sight. The system utilizes a transceiver containing a single telescope with a circulator. The telescope is used for both transmitting and receiving and thus reduces communication terminal dimensions and weight. The optimization model was derived under the assumption that the dominant noise source was amplifier spontaneous-emission noise. It is shown that, given the required bit-error rate (BER) and the rms random pointing jitter, an optimal transceiver gain exists that minimizes transmitted power. We investigate the effect of the amplifier spontaneous-emission noise on the optimal transmitted power and gain by performing an optimization procedure for various combinations of amplifier gain and noise figure. We demonstrate that the amplifier noise figure determines the optimal transmitted power needed to achieve the desired BER but does not affect the optimal transceiver telescope gain. Our numerical example shows that for a BER of 10(-9), doubling the amplifier noise figure results in an 80% increase in minimal transmitted power for a rms pointing jitter of 0.44 microrad.
我们推导了一个模型，该模型在发射机 - 接收机视距存在随机抖动的情况下，优化带有光前置放大器的激光卫星通信链路的性能。该系统使用一个包含带环行器的单望远镜的收发信机。该望远镜用于发射和接收，从而减小了通信终端的尺寸和重量。优化模型是在主导噪声源为放大器自发辐射噪声的假设下推导出来的。结果表明，在给定所需误码率（BER）和均方根随机指向抖动的情况下，存在一个使发射功率最小化的最优收发信机增益。我们通过对放大器增益和噪声系数的各种组合执行优化程序，研究了放大器自发辐射噪声对最优发射功率和增益的影响。我们证明，放大器噪声系数决定了实现所需误码率所需的最优发射功率，但不影响最优收发信机望远镜增益。我们的数值示例表明，对于误码率为10^(-9)的情况，当均方根指向抖动为0.44微弧度时，将放大器噪声系数加倍会导致最小发射功率增加80%。
