公开(公告)号：US4650289A

公开(公告)日：1987-03-17

申请号：US123080

申请日：1980-02-20

Applicant: Hideo Kuwahara

Inventor： Hideo Kuwahara

IPC: H04B10/40 ,  G02B27/28 ,  G02F1/09 ,  H04B10/00 ,  H04B10/50 ,  H04B10/60 ,  G02F1/29

CPC classification number: G02F1/093 ,  G02B27/283 ,  G02F2203/06

Abstract: An optical circulator comprising a first optical path and a second optical path formed between a first polarizer prism and a second polarizer prism, Faraday rotators interposed in the first and second optical paths, the polarizing direction of the Faraday rotators being rotated by an angle of 45.degree. by a magnetic field and the direction of polarizing rotation being reversed with respect to the propagation direction of light which passes therethrough, and polarizing direction rotators interposed in the first and second optical paths, the polarizing direction of the polarizing direction rotators being rotated by an angle of 45.degree. and the direction of polarizing rotation not being reversed with respect to the propagation direction of light which passes therethrough.

Abstract translation: 一种光循环器，包括形成在第一偏光棱镜和第二偏光棱镜之间的第一光路和第二光路，插入在第一和第二光路中的法拉第旋转器，法拉第旋转器的偏振方向旋转角度为45° DEG，偏振旋转方向相对于通过其的光的传播方向反转，偏振方向旋转体插入第一和第二光路中，偏振方向旋转体的偏振方向旋转一 角度为45°，偏振旋转方向相对于通过其的光的传播方向不反转。

公开(公告)号：US4965858A

公开(公告)日：1990-10-23

申请号：US310628

申请日：1989-02-14

Applicant: Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Tetsuya Kiyonaga ,  Yoshihito Onoda ,  Hideo Kuwahara ,  Hiroshi Onaka ,  Hideyuki Miyata

Inventor： Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Tetsuya Kiyonaga ,  Yoshihito Onoda ,  Hideo Kuwahara ,  Hiroshi Onaka ,  Hideyuki Miyata

IPC: G02F2/00 ,  H04B10/25 ,  H04B10/516 ,  H04B10/564 ,  H04B10/61

CPC classification number: H04B10/61 ,  H04B10/614 ,  H04B10/64

Abstract: A polarized wave diversity optical receiver for coherent optical communication including: an optical local oscillating circuit (7) for oscillating local oscillating light; a mixing circuit (8) for mixing signal light and the local oscillating light to obtain two polarized components; a detecting circuit (9) for detecting the polarized component to output intermediate frequency signals (e.sub.S and e.sub.P); and a frequency control circuit (11) for controlling, in accordance with the intermediate frequency signals (e.sub.S and e.sub.P), the oscillating frequency of the optical local oscillating circuit (7). To ensure that the intermediate frequency does not disappear, the frequency control circuit (11) outputs a combined signal of a sum and a difference of the intermediate frequency signals (e.sub.S and e.sub.P).

公开(公告)号：US4694224A

公开(公告)日：1987-09-15

申请号：US662944

申请日：1984-10-19

Applicant: Hisato Nakagawa ,  Hideo Kuwahara ,  Atsuo Koyama ,  Mitsuo Akatsuka

Inventor： Hisato Nakagawa ,  Hideo Kuwahara ,  Atsuo Koyama ,  Mitsuo Akatsuka

IPC: H05B41/24 ,  H05B41/298 ,  H05B37/02

CPC classification number: H05B41/2981 ,  Y10S315/07

Abstract: A lighting apparatus for an electric discharge lamp includes a lighting ballast capacitor connected in series to an electric dicharge lamp for stabilizing a lighting current to the lamp; a preheating ballast capacitor connected in parallel to the lamp for supplying a preheating electric power to the lamp; electric power supply including an output transformer for supplying an electric power to the lighting ballast capacitor; a control electric power supply circuit for obtaining a control electric power through the lighting ballast capacitor and discharge lamp or the preheating ballast capacitor without adding a stepdown transformer or a resistive element for voltage drop; and an oscillator which receives the control electric power from the control power supply circuit and controls the electric power supply. With this lighting apparatus, the electric power loss is made small and the miniaturization of the apparatus can be realized.

Abstract translation: 一种用于放电灯的照明装置，包括与用于稳定向灯的点亮电流的电动二极管灯串联连接的照明镇流电容器; 与灯并联连接的预热镇流电容器，用于向灯提供预热电力; 电源，包括用于向照明镇流电容器供电的输出变压器; 用于通过照明镇流电容器和放电灯或预热镇流器电容器获得控制电力的控制电源电路，而不增加降压变压器或电压降电阻元件; 以及振荡器，其接收来自控制电源电路的控制电力并控制电力供应。 利用该照明装置，电力损失小，能够实现装置的小型化。

公开(公告)号：US5003626A

公开(公告)日：1991-03-26

申请号：US433431

申请日：1989-11-08

Applicant: Hideo Kuwahara ,  Terumi Chikama ,  Tetsuya Kiyonaga ,  Chiaki Ohsawa

Inventor： Hideo Kuwahara ,  Terumi Chikama ,  Tetsuya Kiyonaga ,  Chiaki Ohsawa

IPC: H04B10/61 ,  H04B10/63 ,  H04B10/64

CPC classification number: H04B10/61 ,  H04B10/614 ,  H04B10/63 ,  H04B10/64

Abstract: An optical signal receiver comprising an optical mixing/polarization splitting unit for producing IF optical signals having two orthogonally polarized components, an optical signal receiving unit for producing four corresponding IF electric signals, and a combining circuit for combining two IF electric signals having one polarization with the other two IF electric signals having the other polarization, suppressing fluctuation of the polarization and the intensity noise of the related local optical signal. The intensity noise suppression is also effective for IF electric signals having a higher frequency range.

Abstract translation: 一种光信号接收机，包括用于产生具有两个正交极化分量的IF光信号的光混合/偏振分离单元，用于产生四个对应的IF电信号的光信号接收单元，以及组合电路，用于将具有一个极化的两个IF电信号 另外两个具有另一极化的IF电信号抑制偏振波动和相关局部光信号的强度噪声。 强度噪声抑制对于具有较高频率范围的IF电信号也是有效的。

公开(公告)号：US5228043A

公开(公告)日：1993-07-13

申请号：US730265

申请日：1991-07-15

Applicant: Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Hideo Kuwahara

Inventor： Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Hideo Kuwahara

IPC: H04B10/516 ,  H04B10/07 ,  H04B10/2507 ,  H04B10/556 ,  H04B10/572 ,  H04B10/58 ,  H04B10/61 ,  H04L27/20 ,  H04L27/22 ,  H04L27/227

CPC classification number: H04L27/223 ,  H04B10/50 ,  H04B10/504 ,  H04B10/5561 ,  H04B10/60 ,  H04B10/64 ,  H04L27/2096

Abstract: A direct modulation phase shift keying transmission system (DM-PSK transmission system) is disclosed for coherent optical fiber transmission in which an injection current supplied to a semiconductor laser is adapted to be directly modulated. This system presents useful features in automatic frequency control, demodulation, and phase noise suppression.

公开(公告)号：US5115332A

公开(公告)日：1992-05-19

申请号：US553744

申请日：1990-07-18

Applicant: Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Tetsuya Kiyonaga ,  Yoshihito Onoda ,  Hideo Kuwahara

Inventor： Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Tetsuya Kiyonaga ,  Yoshihito Onoda ,  Hideo Kuwahara

IPC: H04B10/2513 ,  H04B10/61 ,  H04B10/63 ,  H04B10/64

CPC classification number: H04B10/61 ,  H04B10/2513 ,  H04B10/613 ,  H04B10/63 ,  H04B10/64

Abstract: A receiver for coherent optical communication in a phase diversity system. An optical hybrid circuit receives a signal beam and receives a local-oscillator beam which has a predetermined phase shift. The optical hybrid circuit branches each beam into pairs, each pair having one signal beam and one local-oscillator beam. These beam pairs are output to first and second photodetectors which each apply a photoelectric conversion, thus producing first and second output signals. The output signals are output to an electrical 90.degree. hybrid circuit which shifts the first signal by 90.degree. and adds it to the second signal to produce a first output signal, and shifts the second signal by 90.degree. and adds it to the first signal to produce a second output signal. The first and second output signals are applied to first and second demodulators, respectively, which delay the signals by a delay corresponding to their frequency. The demodulators output the delayed signals to an adder which adds the two signals to produce an output signal. As a result, the receiver is capable of compensating the wavelength dispension is an optical fiber to secure an enhanced receiving sensitivity.