Optical receiver
    1.
    发明授权

    公开(公告)号:US06658217B2

    公开(公告)日:2003-12-02

    申请号:US09946450

    申请日:2001-09-06

    IPC分类号: H04B1006

    摘要: An optical receiver generates a voltage signal having a predetermined swing from a current signal, and feeds the voltage signal to a decision circuit. An optical receiving element receives the input optical signal, converts the optical signal to a current signal, and provides the current signal to a preamplifier, which converts the input current signal into a voltage signal. The voltage signal is input to an amplifier having a limiting function, which linearly amplifies the voltage signal when the swing of the voltage signal is smaller than a predetermined value, and limitedly amplifies the voltage signal when the voltage signal is greater than the predetermined value. An automatic-gain-control amplifier receives the output from the amplifier with the limiting function, and amplifies the input voltage signal to a voltage signal having a constant swing. The decision circuit receives the output of the automatic-gain-control amplifier and decides the binary nature of the voltage, and thus of the input optical signal.

    Optical receiver
    2.
    发明授权
    Optical receiver 失效
    光接收机

    公开(公告)号:US06304357B1

    公开(公告)日:2001-10-16

    申请号:US09041973

    申请日:1998-03-13

    IPC分类号: H04B1006

    摘要: An optical receiver generates a voltage signal having a predetermined swing from a current signal, and feeds the voltage signal to a decision circuit. An optical receiving element receives the input optical signal, converts the optical signal to a current signal, and provides the current signal to a preamplifier, which converts the input current signal into a voltage signal. The voltage signal is input to an amplifier having a limiting function, which linearly amplifies the voltage signal when the swing of the voltage signal is smaller than a predetermined value, and limitedly amplifies the voltage signal when the voltage signal is greater than the predetermined value. An automatic-gain-control amplifier receives the output from the amplifier with the limiting function, and amplifies the input voltage signal to a voltage signal having a constant swing. The decision circuit receives the output of the automatic-gain-control amplifier and decides the binary nature of the voltage, and thus of the input optical signal.

    摘要翻译: 光接收器从电流信号产生具有预定摆幅的电压信号,并将电压信号馈送到判定电路。 光接收元件接收输入光信号,将光信号转换为电流信号,并将电流信号提供给前置放大器,将前置放大器转换成电压信号。 电压信号被输入到具有限制功能的放大器,当电压信号的摆动小于预定值时线性放大电压信号,并且当电压信号大于预定值时有限地放大电压信号。 自动增益控制放大器以限制功能接收来自放大器的输出,并将输入电压信号放大到具有恒定摆幅的电压信号。 决定电路接收自动增益控制放大器的输出,并确定电压的二进制特性,从而确定输入光信号的二进制特性。

    Optical transmitter
    4.
    发明授权

    公开(公告)号:US07099596B2

    公开(公告)日:2006-08-29

    申请号:US10319514

    申请日:2002-12-16

    IPC分类号: H04B10/04

    CPC分类号: H04B10/504 H04B10/505

    摘要: A high-speed optical transmitter having an optical modulator and a driver circuit while maintaining optical modulator performance. The high-speed optical transmitter comprises the optical modulator which modulates and outputs an input light in accordance with an applied voltage, and a driver circuit which outputs the applied voltage into the optical modulator and has an emitter follower circuit at an output stage thereof.

    Optical single sideband transmitter
    5.
    发明授权
    Optical single sideband transmitter 失效
    光学单边带发射机

    公开(公告)号:US06850713B2

    公开(公告)日:2005-02-01

    申请号:US10320527

    申请日:2002-12-17

    摘要: With the normal modulation method, it is difficult to construct a Hilbert transform device because it is complicated. To solve the problem, a single sideband modulated optical pulse train is generated by driving a Mach-Zehnder optical modulator for optical pulse generation with a laser source's sine wave clock signals that have been rendered 90 degrees out of phase from each other. The generated pulse train is applied to an optical modulator, modulated with an NRZ (nonreturn-to-zero) data signal, and filtered by a narrow-band optical filter to obtain one of two sidebands.

    摘要翻译: 利用正常的调制方法,由于复杂而难以构造希尔伯特变换装置。 为了解决这个问题,通过用激光源的正弦波时钟信号驱动用于光脉冲生成的马赫 - 曾德尔光学调制器来产生单个边带调制的光脉冲串,这些信号彼此相差90度。 所产生的脉冲串被施加到用NRZ(非归零)数据信号调制的光调制器,并由窄带滤光器滤波以获得两个边带之一。

    Feedback type pre-amplifier
    10.
    发明授权
    Feedback type pre-amplifier 失效
    反馈型前置放大器

    公开(公告)号:US5844445A

    公开(公告)日:1998-12-01

    申请号:US736209

    申请日:1996-10-25

    申请人: Ryoji Takeyari

    发明人: Ryoji Takeyari

    CPC分类号: H03G1/007 H03F1/34 H03F3/343

    摘要: A pre-amplifier disclosed in which low noise at the time of small input and linear amplification at the time of large input are compatible. In a pre-amplifier, such compatibility can be realized by constituting a current mirror circuit, with respect to a current of a first stage transistor in a transimpedance portion, by a by-passing transistor which is provided at an input side of the pre-amplifier. In such a configuration, by making a by-pass current flow proportionally to an input instantaneous current at the time of a large input, the transimpedance can be made small equivalently to thereby widen the dynamic range.

    摘要翻译: 公开了一种前置放大器,其中在大输入时小输入和线性放大时的低噪声是兼容的。 在前置放大器中,这种兼容性可以通过构成相对于跨阻抗部分中的第一级晶体管的电流的电流镜电路来实现,该旁路晶体管设置在预放大器的输入侧, 放大器 在这种结构中,通过在大输入时与输入瞬时电流成比例地使旁路电流流动,可以将跨阻抗等同地变小,从而扩大动态范围。