Modulation controlling circuit
    2.
    发明授权

    公开(公告)号:US06658213B2

    公开(公告)日:2003-12-02

    申请号:US09768696

    申请日:2001-01-24

    IPC分类号: H04B1004

    CPC分类号: G02F1/0123 G02F2201/58

    摘要: The invention relates to a modulation controlling circuit for supplying a modulating signal to an external modulator that outputs a modulated optical signal, while setting a proper operating point in the external modulator. The external modulator that operates in cooperation with the modulation controlling circuit of the invention enables high-quality modulation at a wide bit rate range. Therefore, in an optical transmission system or a measuring instrument to which the invention is applied, the characteristics and the performance are improved and the operation is made stable without loss of advantages of the external modulator.