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    • 6. 发明授权
    • Multi-component glass optical fiber for optical communication
    • 用于光通信的多组件玻璃光纤
    • US4418985A
    • 1983-12-06
    • US382286
    • 1982-05-26
    • Mituo KasoriTakeshi TakanoHironori MakiNaohiko Ogino
    • Mituo KasoriTakeshi TakanoHironori MakiNaohiko Ogino
    • C03C3/00C03C3/064C03C3/091C03C13/04G02B6/00C03C3/08C03C13/00G02B5/14
    • C03C13/046Y10S501/903
    • There is provided a multi-component system glass fiber for optical communication which comprises a multi-component system glass for core having a composition comprising SiO.sub.2, BaO, Al.sub.2 O.sub.3, B.sub.2 O.sub.3, at least one alkali metal oxide selected from Na.sub.2 O, K.sub.2 O and Li.sub.2 O, MgO and CaO in amounts as specified in the specification and claims, and a multi-component system glass for clad layer having a composition comprising SiO.sub.2, Al.sub.2 O.sub.3, B.sub.2 O.sub.3, Na.sub.2 O, K.sub.2 O, Li.sub.2 O, at least one alkaline earth metal selected from MgO and CaO in amounts as specified in the specification and claims. The core in the glass fiber for optical communication according to the present invention shows lower optical loss and the clad layer shows high weathering resistance, and the glass fiber according to the present invention suffers from no devitrification during fiber drawing and is excellent in dimensional stability.
    • 提供了一种用于光通信的多组分系统玻璃纤维,其包括具有包含SiO 2,BaO,Al 2 O 3,B 2 O 3,至少一种选自Na 2 O,K 2 O和Li 2 O的碱金属氧化物,MgO, 和CaO,以及包含SiO 2,Al 2 O 3,B 2 O 3,Na 2 O,K 2 O,Li 2 O,至少一种选自MgO和CaO中的碱土金属的组成的包层的多组分体系玻璃 在说明书和权利要求书中指定的量。 根据本发明的用于光通信的玻璃纤维的芯体显示出较低的光损耗,并且包覆层具有高的耐候性,并且根据本发明的玻璃纤维在纤维拉伸期间不会失透,并且尺寸稳定性优异。
    • 9. 发明授权
    • Power amplifier with distortion compensation circuit
    • 具有失真补偿电路的功率放大器
    • US07663436B2
    • 2010-02-16
    • US12000616
    • 2007-12-14
    • Takeshi TakanoYasuyuki OishiToru Maniwa
    • Takeshi TakanoYasuyuki OishiToru Maniwa
    • H03F1/26
    • H03F1/3247H03F1/30H03F1/3282H03F2201/3209H03F2201/3212H03F2201/3224H03F2201/3233
    • A power amplifier negates a memory effect and is applied a linearizer using a digital predistortion system even in an inexpensive device. The power amplifier compares an input signal power against a sampled component of an output power, and provides predistortion to the input signal power so as to minimize a difference as a result of the comparison. The power amplifier comprises a gain lookup table storing a gain coefficient value corresponding to a temperature address determined for an input power; a phase lookup table storing a phase coefficient value corresponding to the temperature address determined for the input power; a transversal filter, which is input with the input power, and which outputs the temperature address; and a coefficient multiplier modulating the input signal using a gain coefficient value and a phase coefficient value, which correspond to the temperature address and which are read out from the gain coefficient lookup table and the phase lookup table.
    • 功率放大器消除了记忆效应,并且即使在廉价的设备中也使用数字预失真系统应用线性化。 功率放大器将输入信号功率与输出功率的采样分量进行比较,并且为输入信号功率提供预失真,以便作为比较的结果使差异最小化。 功率放大器包括:增益查找表,其存储对应于为输入功率确定的温度地址的增益系数值; 相位查找表,存储与为输入功率确定的温度地址对应的相位系数值; 横向滤波器,其输入有输入功率,并输出温度地址; 以及系数乘法器,其使用与所述温度地址对应并且从所述增益系数查找表和所述相位查找表读出的增益系数值和相位系数值来调制所述输入信号。