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    • 4. 发明申请
    • Signal transmission apparatus
    • 信号传输装置
    • US20070197258A1
    • 2007-08-23
    • US10592329
    • 2005-06-02
    • Katsuya OdaHitomaro TohgohYoshiyasu SatoHiroaki Asano
    • Katsuya OdaHitomaro TohgohYoshiyasu SatoHiroaki Asano
    • H04Q7/20H04M1/00H04B1/38
    • H04J14/02H04B10/25758H04J14/0221
    • Up and down signal levels in a wireless base station and a forward base station can be automatically adjusted into predetermined levels respectively with a simple configuration. In an interface portion 12, a pilot signal P of a predetermined level is generated by a pilot signal generator 120, and multiplexed with a down transmission signal 111 from a wireless base station 11 by a multiplexer 121. The multiplexed signal is amplified with a constant gain by a down signal amplifier 122, then converted into a down optical signal by an electro-optic converter 123, wavelength-multiplexed by an optical multi/demultiplexer 124, sent out to an optical fiber 15, and transmitted to a forward base station 13. In the forward base station 13, the down optical signal wavelength-demultiplexed by an optical multi/demultiplexer 124 is converted into a down electric signal by an opto-electric converter 125, and the pilot signal P is demultiplexed by a demultiplexer 133. A gain control unit 130 detects an absolute level of the pilot signal P, and outputs a gain control signal G1 to set the level value at a predetermined rated value. A down signal gain variable amplifier 134 and an up signal gain variable amplifier 136 amplify the down transmission signal and the up reception signal respectively with a gain controlled by the gain control signal G1.
    • 无线基站和前向基站中的上下信号电平可以分别以简单的配置自动调整到预定的电平。 在接口部分12中,由导频信号发生器120产生预定电平的导频信号P,并通过多路复用器121与来自无线基站11的下行发送信号111进行多路复用。 多路复用信号由下行信号放大器122以恒定增益放大,然后由电光转换器123转换成降低的光信号,由光多路复用器124波分复用,发送到光纤15, 并发送到前向基站13。 在正向基站13中,由光多路复用器124波分复用的下行光信号通过光电转换器125转换成降电信号,并且导频信号P被解复用器133解复用。 增益控制单元130检测导频信号P的绝对电平,并输出增益控制信号G 1,将电平值设定在预定的额定值。 下降信号增益可变放大器134和上升信号增益可变放大器136分别利用增益控制信号G 1所控制的增益放大下行传输信号和上行接收信号。
    • 9. 发明申请
    • Optical module and optical transceiver
    • 光模块和光收发器
    • US20060147158A1
    • 2006-07-06
    • US10547811
    • 2004-03-08
    • Yoshiyasu SatoHitomaro Tougou
    • Yoshiyasu SatoHitomaro Tougou
    • G02B6/36
    • G02B6/4204G02B6/3822G02B6/3837G02B6/3861
    • A technique to prevent return light by an inexpensive construction in an optical module is disclosed. According to this technique, at the end face of a cylindrical metal part made of SUS 303, a hole to expose the end of an optical fiber wire 2 is formed, and then a hole to let through an optical fiber 1 is made to fabricate a cylindrical metal ferrule 3. Further, in a cylindrical metal part made of SUS 304, a hole to let through the optical fiber and the metal ferrule 3 is formed to fabricate a metal ferrule 4. The metal ferrule 3 is inserted and jointed into a cavity section of the metal ferrule 4 by press fitting or the like. Further, the optical fiber is inserted in the holes of the metal ferrules 3 and 4 so that the optical fiber wire is exposed from an end face of the metal ferrule 3. The gap between the optical fiber and the metal ferrules 3, 4 is jointed by an adhesive 17.
    • 公开了一种通过光学模块中廉价的结构来防止返回光的技术。 根据该技术,在由SUS303制成的圆筒状金属部件的端面形成有露出光纤线2的端部的孔,然后形成通过光纤1的孔,以制造 圆柱形金属套管3。 此外,在由SUS304制成的圆筒形金属部件中,形成通过光纤和金属套圈3的孔,以制造金属套圈4。 通过压配合等将金属套圈3插入并连接到金属套圈4的空腔部分中。 此外,将光纤插入金属套圈3和4的孔中,使得光纤线从金属套圈3的端面露出。 光纤和金属套圈3,4之间的间隙通过粘合剂17接合。