title: Optimization of an analog intersatellite microwave photonics link with an optical preamplifier.
abstract: An exact analytical expression of the signal-to-noise ratio (SNR) for an intersatellite microwave photonics link with an optical preamplifier is derived considering the signal fade caused by the pointing errors of the transceiver, and an optimized model for laser output power and direct current (DC) bias phase shift of the Mach-Zehnder modulator is established. It is shown that, given the desired SNR and the root mean square (rms) random pointing jitter, an optimal DC bias phase shift exists that minimizes laser output power. The effects of the optical preamplifier parameters on the minimum laser output power and optimal DC bias phase shift are also examined. Numerical results show that the preamplifier noise figure determines the minimum laser output power needed to achieve the desired SNR but affects the optimal DC bias phase shift little. For a SNR of 20 dB, doubling the preamplifier noise figure results in a 6.36 dB increase in minimum laser output power for rms pointing jitter of 0.4 μrad.
authors: College of Information and Navigation, Xi’an 710077, China. zhuzihang6@126.com
authors: Zihang
authors: Z
authors: Zhu
authors: Shanghong
authors: S
authors: Zhao
authors: Yongjun
authors: Y
authors: Li
authors: Xingchun
authors: X
authors: Chu
authors: Rui
authors: R
authors: Hou
authors: Xiang
authors: X
authors: Wang
authors: Guhao
authors: G
authors: Zhao