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当前,最后1km宽带接入解决方案是光纤和无线电波技术。但光纤实施缓慢且花费高;无线电波技术虽能快速安装和比光纤价格低,但带宽却非常有限,并且传输不安全和需要申请频率执照。而无线光波传输技术的出现弥补了两者的缺陷。由于无线接入非常快,且无线传输中之光波传输有不需申请频率执照与性能价格比高等优点,因而获得光通信与安防监控领域的极大关注。本文介绍无线光波传输系统的组成、原理、特点、应解决的难点、发展、LED与LD传输系统的比较及传输路径的选择。
Currently, the last 1km broadband access solutions are fiber optic and radio wave technologies. However, fiber implementation is slow and costly; while radio wave technology can be installed quickly and at a fraction of the cost of fiber, it has very limited bandwidth and is insecure to transport and requires a frequency license. The emergence of wireless optical transmission technology to make up for the shortcomings of both. Because wireless access is very fast, and wireless transmission of light waves without the need to apply for a license and high performance-cost ratio advantages, which received great attention in the field of optical communications and security monitoring. This article introduces the composition, principle, characteristics, difficulties and development of wireless lightwave transmission system, the comparison of LED and LD transmission system and the choice of transmission path.