Tunable semiconductor laser
    5.
    发明授权
    Tunable semiconductor laser 失效
    可调谐半导体激光器

    公开(公告)号:US5319667A

    公开(公告)日:1994-06-07

    申请号:US35918

    申请日:1993-03-22

    摘要: An interferometric semiconductor laser includes a cavity in the form of a Y and at east three individually actuatable active segments. A central segment couples together the individually actuatable active segments. The central segment is an active or passive segment that acts as a beam divider. The arrangement of the segments forms two resonator paths which contain at least one common active segment. At least one resonator path includes an active segment that does not belong to the other resonator path. In the absence of, or with the same actuation of the active segments, the optical path length of one resonator path differs from the optical path length of the other resonator path.

    摘要翻译: 干涉式半导体激光器包括Y形式的空腔和东部三个可单独致动的活动段。 中央段将可单独致动的活动段连接在一起。 中心段是作为分束器的有源或无源段。 段的排列形成两个共振器路径,其包含至少一个共同的有效段。 至少一个谐振器路径包括不属于另一谐振器路径的有源段。 在不存在或者以相同的激活有源段的情况下,一个谐振器路径的光路长度与另一谐振器路径的光路长度不同。

    Doppler compensation control for radio transmission
    9.
    发明申请
    Doppler compensation control for radio transmission 有权
    无线电传输多普勒补偿控制

    公开(公告)号:US20070197165A1

    公开(公告)日:2007-08-23

    申请号:US11636984

    申请日:2006-12-12

    IPC分类号: H04B1/00

    CPC分类号: H04B7/01 H04W56/0035

    摘要: A Doppler compensation method is used for radio transmission between a mobile body possibly but not exclusively a train and some base station, both mobile body and base station comprise respectively a transceiver connected to an antenna for the radio transmission. The method comprises the step of determining the direction of motion of the mobile body with respect to the active base station i.e. the base station to which a radio transmission link is just built. The method is then followed by the step to apply a constant Doppler compensation corresponding to the cancellation of the Doppler effect for a mobile body moving in the same direction at predefined limiting speed of motion (vlimit) at which a quality threshold is reached with the used radio transmission technology in the case without a Doppler compensation.

    摘要翻译: 多普勒补偿方法用于移动体之间的无线电传输,可能但不排除列车和一些基站,移动体和基站分别包括连接到无线电传输天线的收发机。 该方法包括以下步骤:确定移动体相对于有源基站(即正在构建无线电传输链路的基站)的运动方向。 该方法之后是步骤,以预定的极限运动速度(v>极限)在相同方向上移动对应于多普勒效应消除的常数多普勒补偿(v> 在没有多普勒补偿的情况下,使用无线电传输技术达到了质量阈值。