公开(公告)号：US20080253765A1

公开(公告)日：2008-10-16

申请号：US12028603

申请日：2008-02-08

申请人： Kouichi Sugimura ,  Kiyoshi Yamauchi ,  Chizuru Yuyama ,  Tomoya Nakamura ,  Kenji Sasaki

发明人： Kouichi Sugimura ,  Kiyoshi Yamauchi ,  Chizuru Yuyama ,  Tomoya Nakamura ,  Kenji Sasaki

IPC分类号： H04B10/08 ,  H04B10/06

CPC分类号： H04B10/07955 ,  H04B10/6911

摘要： An optical power measuring apparatus for measuring a power level of an optical signal comprised of a light intensity modulated signal, received by a light receiving element is provided. In the apparatus, a first signal path including a first voltage detection circuit and a first amplifier circuit supplies a processor with a first signal having a voltage proportional to a current flowing through a light receiving element (PD), and a second path including a TIA, a DC detection circuit and a second amplifier circuit supply the processor with a second signal. The second signal corresponding to an envelope of a voltage from the TIA. The processor compares the level of the first signal with a predetermined set value to select an optical power value retrieved based on the first signal when the level of the first signal is equal to or higher than the set value, and to select an optical power value retrieved based on the second signal when lower than the set value, and outputs the selected optical power value as a measured optical power value Pout. An output signal of the TIA can be supplied to an external device, so that the optical power measuring apparatus can measure an optical power level while serving as an optical signal receiving apparatus.

摘要翻译： 提供了一种用于测量由光接收元件接收的由光强调制信号组成的光信号的功率电平的光功率测量装置。 在该装置中，包括第一电压检测电路和第一放大器电路的第一信号路径向处理器提供具有与流过光接收元件（PD）的电流成比例的电压的第一信号，以及包括TIA的第二路径 DC检测电路和第二放大器电路为处理器提供第二信号。 第二信号对应于来自TIA的电压的包络。 处理器将第一信号的电平与预定设定值进行比较，以选择当第一信号的电平等于或高于设定值时基于第一信号检索的光功率值，并选择光功率值 当低于设定值时，基于第二信号检索，并将所选择的光功率值作为测量光功率值Pout输出。 TIA的输出信号可以被提供给外部设备，使得光功率测量设备可以在用作光信号接收设备的同时测量光功率电平。