System and method for providing an eye safe laser communication system

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	System and method for providing an eye safe laser communication system
其他题名	System and method for providing an eye safe laser communication system
	BLOOM, SCOTT H.; DUNN, JAMES E.; ACAMPORA, ANTHONY
	2003-07-15
专利权人	XYLON LLC
公开日期	2003-07-15
授权国家	美国
专利类型	授权发明
摘要	A system and method for producing an eye safe laser communication system. The system and method detects an interfering object in the optical path and cuts off or reduces the power in the communication beam to safe levels. In one embodiment, a second laser diode transmitter and receiver is installed in each network node. The laser transmitter is pointed at a corresponding network node and the pulses travel in parallel with the communication beam. The pulses are reflected back to the transmitting node where they are detected. Their flight time is measured. When an interfering object is present, in one scenario, the pulses bounce of the interfering object and return to the receiver in the transmitting node, resulting in a reduced flight time. This reduced flight time is interpreted as an interfering object and the beam is shut down or reduced to a safe level. In a second scenario, the interfering object absorbs the detection beam. In another embodiment, a CCD camera is used to capture a reflection from an object in the path of the communication link. In this embodiment the CCD has an overlapping field of view with the communication transceiver's transmit laser. The laser's transmission beam forms a baseline pattern on the CCD. Any pixel to pixel variation from the baseline pattern indicates an interference, thus triggering the system to shut down or reduce the power of the communication link. Another embodiment uses retroreflection of the human eye to detect interference by the human eye and an optical magnification device. In this embodiment, a CCD is used to detect signals bent back by retroreflection of the human eye. When such a signal is detected, the link is immediately shut down. Another embodiment utilizes the communication link itself and a detector in the receiver to detect instantaneous power drops caused by an interfering object. When an interfering object is detected, the system shuts down or reduces the power of the communication beam to an eye safe level.
其他摘要	一种用于产生人眼安全激光通信系统的系统和方法。该系统和方法检测光路中的干扰对象，并切断或减少通信波束中的功率到安全水平。在一个实施例中，第二激光二极管发射器和接收器安装在每个网络节点中。激光发射器指向相应的网络节点，并且脉冲与通信波束并行传播。脉冲被反射回发射节点，在那里检测到它们。他们的飞行时间是衡量的。当存在干扰对象时，在一种情况下，脉冲反弹干扰物体并返回到发射节点中的接收器，导致飞行时间减少。这种减少的飞行时间被解释为干扰物体，并且光束被关闭或降低到安全水平。在第二种情况下，干扰物体吸收检测光束。在另一个实施例中，CCD相机用于捕获反射来自通信链路路径中的对象。在该实施例中，CCD具有与通信收发器的发射激光器重叠的视场。激光的透射光束在CCD上形成基线图案。与基线模式的任何像素到像素的变化都表示干扰，从而触发系统关闭或降低通信链路的功率。另一个实施例使用人眼的逆向反射来检测人眼和光学放大装置的干扰。在该实施例中，CCD用于检测通过人眼的逆向反射而向后弯曲的信号。当检测到这样的信号时，立即关闭链路。另一个实施例利用通信链路本身和接收器中的检测器来检测由干扰对象引起的瞬时功率下降。当检测到干扰对象时，系统将通信波束的功率关闭或降低到眼睛安全水平。
申请日期	1999-12-28
专利号	US6594043
专利状态	授权
申请号	US09/473076
公开（公告）号	US6594043
IPC 分类号	H04B10/10 \| H04B10/08 \| H04B10/00 \| H04K3/00 \| G01J1/32 \| G06M7/00
专利代理人	-
代理机构	KNOBBE,MARTENS,OLSON & BEAR,LLP
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/34469
专题	半导体激光器专利数据库
作者单位	XYLON LLC
推荐引用方式 GB/T 7714	BLOOM, SCOTT H.,DUNN, JAMES E.,ACAMPORA, ANTHONY. System and method for providing an eye safe laser communication system. US6594043[P]. 2003-07-15.

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