Method and apparatus for controlling signal power level in free space communication
    1.
    发明授权
    Method and apparatus for controlling signal power level in free space communication 有权
    用于控制自由空间通信中的信号功率电平的方法和装置

    公开(公告)号:US06643466B1

    公开(公告)日:2003-11-04

    申请号:US09675003

    申请日:2000-09-29

    IPC分类号: H04B1000

    摘要: In the method and apparatus for controlling the power level of a laser signal in free space communication, a communication terminal transmits an output laser beam into free space and also receives information, through a channel that is not free space laser based, about the power of the output laser beam measured at a distance and at different times. The terminal determines whether a drop in the power of the output laser beam measured at the distance is due to atmospheric effects based on the received information. The terminal increases the power level of the output laser beam to a desired level if the power drop is determined to be due to atmospheric effects. On the other hand, the terminal lowers the power of the output laser beam to a predetermined level if the power drop is determined to be due to blockage thus avoiding harm to accidental observers that might intrude into the path of the laser beams.

    摘要翻译: 在用于控制自由空间通信中的激光信号的功率电平的方法和装置中,通信终端将输出激光束发射到自由空间中,并且通过不是以自由空间激光为基础的信道来接收信息, 在一段距离和不同时间测量输出激光束。 终端确定在距离处测量的输出激光束的功率的下降是否是由于基于所接收的信息的大气影响。 如果确定功率降是由于大气效应,则端子将输出激光束的功率电平增加到期望的水平。 另一方面,如果断电被确定为由于阻塞而导致输出激光束的功率降低到预定水平,从而避免对可能侵入到激光束路径中的意外观测器的危害。

    Receiving system for free-space optical communications
    4.
    发明授权
    Receiving system for free-space optical communications 有权
    自由空间光通信接收系统

    公开(公告)号:US06348684B1

    公开(公告)日:2002-02-19

    申请号:US09276168

    申请日:1999-03-25

    IPC分类号: H04B1006

    CPC分类号: H04B10/1121

    摘要: An optical receiving system includes a Fresnel lens optically coupled to a detector via a tapered concentrator. The Fresnel lens is adapted to receive an electromagnetic signal and has a Fresnel focal point. The tapered concentrator has a first end surface area larger than a second end surface area. The detector has a sensing surface area oriented to receive the electromagnetic signal emerging from the tapered concentrator.

    摘要翻译: 光接收系统包括通过锥形聚光器光耦合到检测器的菲涅尔透镜。 菲涅尔透镜适于接收电磁信号并具有菲涅耳焦点。 锥形集中器具有大于第二端面区域的第一端面面积。 检测器具有被定向为接收从锥形集中器出现的电磁信号的感测表面区域。