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21. 发明授权

US4720162A Device for switching from one light source to another 失效
标题翻译：用于从一个光源切换到另一个光源的设备
公开(公告)号：US4720162A
公开(公告)日：1988-01-19
申请号：US850453
申请日：1986-04-11
申请人： Kiyofumi Mochizuki , Hiroharu Wakabayashi , Yoshihori Namihira , Hideharu Tokiwa
发明人： Kiyofumi Mochizuki , Hiroharu Wakabayashi , Yoshihori Namihira , Hideharu Tokiwa
IPC分类号： G02B6/293 , G02B6/34 , G02B27/28 , G02B6/26
CPC分类号： G02B6/4215 , G02B6/2713 , G02B6/274 , G02B6/2773
摘要： An optical coupler is formed of at least one polarization maintaining single mode fiber, a polarizing beam splitter connected to the polarization maintaining single mode fiber, and a main optical fiber which is connected with the polarizing beam splitter at one end thereof. This optical coupler is useful as a changeover switch for a light source.
摘要翻译：光耦合器由至少一个偏振保持单模光纤，连接到偏振保持单模光纤的偏振分束器和与其偏振分束器的一端连接的主光纤形成。该光耦合器可用作光源的转换开关。

22. 发明授权

US4320968A Fault location system in an optical fiber transmission system 失效
标题翻译：光纤传输系统故障定位系统
公开(公告)号：US4320968A
公开(公告)日：1982-03-23
申请号：US131396
申请日：1980-03-18
申请人： Hiroharu Wakabayashi , Hideharu Tokiwa
发明人： Hiroharu Wakabayashi , Hideharu Tokiwa
IPC分类号： G01M11/00 , G01N21/88
CPC分类号： G01M11/3172
摘要： A fault location system for locating the fault point of an optical fiber transmission system has been found. The present system comprises a laser for generating an optical beam, a sweep oscillator for modulating said laser beam, a half mirror mounted between the outlet of the laser and the inlet of the optical fiber to be tested, an optical receiver for converting the optical beam reflected by the fault point to an electrical signal through said half mirror, a modulator for providing the frequency difference between the instantaneous output frequency of said sweep oscillator and the output frequency of said optical receiver, a low pass filter connected to the output of said modulator, and a spectrum analyzer connected to the output of the low pass filter. The present system has the advantage that the S/N of the system is excellent, and plural fault points can be located at the same time.
摘要翻译：已经发现了用于定位光纤传输系统的故障点的故障定位系统。本系统包括用于产生光束的激光器，用于调制所述激光束的扫描振荡器，安装在激光器的出口与被测光纤的入口之间的半反射镜，用于将光束由故障点反射到通过所述半反射镜的电信号，用于提供所述扫频振荡器的瞬时输出频率与所述光接收机的输出频率之间的频率差的调制器，连接到所述调制器的输出端的低通滤波器，以及连接到低通滤波器的输出的频谱分析仪。本系统的优点是系统的S / N优异，同时可以同时定位多个故障点。

23. 发明授权

US4270029A Selection system for digital signal repeaters 失效
标题翻译：数字信号中继器选择系统
公开(公告)号：US4270029A
公开(公告)日：1981-05-26
申请号：US20873
申请日：1979-03-15
申请人： Masanori Sato , Hiroharu Wakabayashi , Yoshihiro Ejiri , Hitoshi Yamamoto
发明人： Masanori Sato , Hiroharu Wakabayashi , Yoshihiro Ejiri , Hitoshi Yamamoto
IPC分类号： H04B17/40 , H04B1/60
CPC分类号： H04B17/406
摘要： A digital signal repeater selecting system for a digital signal transmission system equipped with a plurality of digital signal repeaters disposed on a transmission line at desired intervals, in which there are provided in each of the repeaters a delay circuit having a particular delay time corresponding to an integral multiple of the unit code length of a digital signal and assigned to the repeater and having its input terminal connected to the transmission line, and a code comparator for comparing the input signal to and the output signal from the delay circuit with each other to produce a predetermined output signal when the both signals are decided to be substantially identical with each other, and in which when a repeater selecting code train repeating in synchronism with the delay time is applied to the transmission line, the repeater to which the delay time is assigned produces the predetermined output signal from the code comparator to allow an operation of selecting the repeater. The above principle can be applied to monitor the condition of the transmission line.
摘要翻译：一种用于数字信号传输系统的数字信号中继器选择系统，该数字信号传输系统配备有以所需间隔设置在传输线上的多个数字信号中继器，其中在每个中继器中设置延迟电路，该延迟电路具有对应于数字信号的单位码长度的整数倍，分配给中继器并将其输入端连接到传输线;以及代码比较器，用于将输入信号与来自延迟电路的输出信号相互比较，以产生当两个信号被确定为彼此基本相同时，预定的输出信号，并且当将与延迟时间同步的中继器选择代码序列应用于传输线时，分配了延迟时间的中继器从代码比较器产生预定的输出信号，以允许选择重复的操作呃上述原理可用于监测传输线的状况。

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