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    • 1. 发明授权
    • Optical network
    • 光网络
    • US06643041B1
    • 2003-11-04
    • US09345747
    • 1999-07-01
    • Hiroki IkedaTatsuo Kanetake
    • Hiroki IkedaTatsuo Kanetake
    • H04B1020
    • H04J14/0295H04J14/0206H04J14/0212H04J14/0283H04J2203/006
    • A first object of the invention of the present application is to provide an optical network capable of flexibly performing a choice of protection optical paths upon the occurrence of a failure without depending on an installation form of an optical transmission line, e.g., an optical fiber. A second object of the invention of the present application is to allow an improvement in the efficiency of use of an optical transmission line, e.g., an optical fiber employed in an optical network. The invention of the present application provides a wavelength division multiplexing transmission optical network having at least a plurality of pieces of transmission equipment and a plurality of optical paths connecting the transmission equipment and wherein wavelengths of predetermined transmission light are assigned to the optical paths and a transmission frame having overhead information is at least used to perform digital transmission.
    • 本发明的第一个目的是提供一种光网络,其能够在发生故障时灵活地执行保护光路的选择,而不依赖于诸如光纤的光传输线的安装形式。 本发明的第二个目的是允许提高光传输线路的使用效率,例如光网络中使用的光纤。 本申请的发明提供了一种具有至少多个传输设备和连接传输设备的多个光路的波分复用传输光网络,其中预定传输光的波长被分配给光路和传输 至少使用具有开销信息的帧来执行数字传输。
    • 2. 发明授权
    • Transimpedance amplifier and PON system
    • 互阻放大器和PON系统
    • US08653433B2
    • 2014-02-18
    • US13145047
    • 2010-01-13
    • Daisuke MashimoHiroki IkedaYoshinobu Morita
    • Daisuke MashimoHiroki IkedaYoshinobu Morita
    • H03G3/20
    • H03F3/087H03F1/083H03G3/3084H04B10/272H04B10/6931
    • In a gain-switching-type transimpedance amplifier, in order to provide a technique capable of preventing unnecessary gain switching caused when noise is received, and preventing decrease in sensitivity caused when noise with a large input level is received, and then, a burst signal with a small input level is received, a transimpedance amplifier 5 includes: a pre-amplifier 200 to which the burst signal is inputted; an average detection start determination unit 300 for comparing an output of a pre-amplifier 200 with a first threshold voltage; an average detection circuit 400 for detecting and outputting an average value of the output of the pre-amplifier 200 during a certain period of time from a time point when the output of the pre-amplifier 200 exceeds the first threshold voltage; and a gain switching control unit 500 for determining whether to switch a gain of the pre-amplifier 200 based on an output of the average detection circuit 400.
    • 在增益切换式跨阻放大器中,为了提供能够防止在接收到噪声时引起的不必要的增益切换的技术,并且防止在接收到具有大输入电平的噪声时引起的灵敏度降低,然后,突发信号 在接收到小的输入电平的情况下,跨阻抗放大器5包括:输入突发信号的前置放大器200; 平均检测开始判定单元300,用于将前置放大器200的输出与第一阈值电压进行比较; 平均检测电路400,用于在从前置放大器200的输出超过第一阈值电压的时间点起,在一定时间段内检测并输出前置放大器200的输出的平均值; 以及用于基于平均检测电路400的输出来确定是否切换前置放大器200的增益的增益切换控制单元500。
    • 4. 发明授权
    • Optical access system and optical line terminal
    • 光接入系统和光线路终端
    • US08380065B2
    • 2013-02-19
    • US12582083
    • 2009-10-20
    • Michitaka OkunoKoji WakayamaKenichi SakamotoHiroki Ikeda
    • Michitaka OkunoKoji WakayamaKenichi SakamotoHiroki Ikeda
    • H04J14/00
    • H04Q11/0067H04J2203/0058H04L43/0864H04Q2011/0079H04Q2011/0088
    • Provided is an optical access system comprising: an optical line terminal connected to another network; a plurality of optical network units, each connected to a user terminal; and at least one of an optical switching unit and an optical splitter, which is installed between the optical line terminal and the plurality of optical network units. The optical line terminal allocates a length of time to a discovery phase for detecting the plurality of optical network units, and a length of time to data transmission phases for transferring data from the plurality of optical network units; and changes a ratio of the length of time of the discovery phase to the length of time of the data transmission phases so that the length of time of the discovery phase is shortened in the case where a number of the optical network units that are registered in the optical line terminal increase.
    • 提供一种光接入系统,包括:连接到另一网络的光线路终端; 多个光网络单元,各自连接到用户终端; 以及安装在光线路终端与多个光网络单元之间的光交换单元和分光器中的至少一个。 光线路终端将用于检测多个光网络单元的发现阶段的时间长度分配给从多个光网络单元传送数据的数据传输阶段的时间长度; 并且将发现阶段的时间长度与数据传输阶段的时间长度的比率进行改变,使得在注册的光网络单元的数量的情况下,发现阶段的时间长度被缩短 光线路终端增加。
    • 8. 发明授权
    • PON system method for receiving optical signal and OLT
    • PON系统接收光信号和OLT的方法
    • US08116627B2
    • 2012-02-14
    • US12222224
    • 2008-08-05
    • Hiroki IkedaToshiki SugawaraYusuke Yajima
    • Hiroki IkedaToshiki SugawaraYusuke Yajima
    • H04B10/20
    • H04B10/272H04B10/27
    • When a signal of weak optical power is received immediately after a signal of intense optical power, input of the signal of intense optical power readily causes saturation, and the influence interferes in the signal of weak optical power to deteriorate receiver sensitivity. Moreover, when a reverse-bias voltage of APD is changed, if a difference between the voltages is large, a next optical signal is received until the receiver sensitivity of the APD becomes stable, so that receiver sensitivity deteriorates. A DBA order is determined so that a difference in reverse-bias voltage is small, and reverse-bias voltage is controlled in line with reception timing from ONU.
    • 当在强光信号之后立即接收到弱光功率的信号时,强光信号信号的输入容易引起饱和,并且影响会干扰弱光功率的信号,从而降低接收机灵敏度。 此外,当APD的反向偏置电压发生变化时,如果电压差大,则接收下一个光信号,直到APD的接收灵敏度变得稳定为止,接收灵敏度变差。 确定DBA顺序,使得反向偏置电压的差小,并且根据ONU的接收定时来控制反向偏置电压。