Traditional free-space optical (FSO) communications use a single transmitting antenna (laser/VCSEL/LED) and a receiving antenna (a photo-detector) for single channel communication between two nodes. In this paper we study two transmitting antenna one receiving antenna M-FSO (mobile FSO) communication system. In the process of single transmitting antenna moving, the optical beam broadens to make receive power smaller with the divergence angle larger and the power is difficult to be detected when long-distance communication. When short-distance communication, the divergence angle is so small that it makes a narrow beam which is hard to be aimed at receive aperture, even more serious when the beam is out of target caused by vibration. We take advantage of space diversity technology to reduce BER caused by atmospheric turbulence and mobile vibration. Through the multi-transmitter, the best choice of multi-divergence angle reduces BER, thus the receiver accurately recovers information.

Date Published: 4 January 2008
PDF: 6 pages
Proc. SPIE 6837, Information Optics and Photonics Technologies II, 68370M (4 January 2008); doi: 10.1117/12.756055

Published in SPIE Proceedings Vol. 6837:
Information Optics and Photonics Technologies II
Guoguang Mu; Feijun Song; Francis T. S. Yu; Suganda Jutamulia, Editor(s)