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1. 发明专利

JPH05291836A 失效
公开(公告)号：JPH05291836A
公开(公告)日：1993-11-05
申请号：JP8743692
申请日：1992-04-09
申请人： FUJITSU LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： HAKOMORI KATSUHIKO , MANO FUMIO
IPC分类号： H03F3/08 , H04B10/07 , H04B10/293 , H04B10/40 , H04B10/43 , H04B10/50 , H04B10/516 , H04B10/564 , H04B10/572 , H04B10/60 , H04B10/69 , H04B10/80 , H04B10/04
摘要： PURPOSE:To prevent the deterioration in the reception sensitivity even when a laser diode is used for a light receiving element by controlling a DC voltage at other terminal of a light receiving means so that a detected error voltage is zero. CONSTITUTION:The receiver is provided with a light receiving means 21 supplied with a current with a level in response to a level of a reception signal given as an optical signal, a reception signal extract means 22 connecting to one terminal of the light receiving means 21 and extracting the reception signal based on a current flowing to the light receiving means 21, an error voltage detection means 23 detecting an error voltage indicating a difference between a DC voltage at one terminal of the light receiving means 21 and a DC voltage at the other terminal, and a voltage control means 24 controlling the voltage at the other terminal of the light receiving means 21 so as to make the error voltage zero based on the error voltage detected by the error voltage detection means 23. Then, the error voltage detection means 23 detects a difference between DC voltages across the light receiving means 21 and the voltage at the other terminal of the light receiving means 21 is controlled so as to make the error voltage zero based on the detected output.

2. 发明专利

JP2009159293A Optical transmission apparatus and optical transmission method 有权
标题翻译：光传输装置和光传输方法
公开(公告)号：JP2009159293A
公开(公告)日：2009-07-16
申请号：JP2007334972
申请日：2007-12-26
申请人： Fujitsu Ltd , 富士通株式会社
发明人： HAKOMORI KATSUHIKO
IPC分类号： H04B10/07 , H04B10/071 , H04B10/077 , H04B10/2537 , H04B10/29 , H04B10/293
CPC分类号： H04B10/071 , H04B10/0771
摘要： PROBLEM TO BE SOLVED: To identify whether reflected light detected in a system is caused by disconnection of an optical connector or SBS and then control the system according to the result of identification.
SOLUTION: An optical transmission apparatus obtains frequency components obtained by removing basic low-frequency waves from return superimposed light which returns from the optical connector on the output side. When the frequency components indicating a low frequency level are obtained at each frequency band, the apparatus identifies the return light which returns from the optical connector on the output side as Fresnel light caused by disconnection of the optical connector. Also, when the frequency components indicating a high frequency level are obtained at frequency bands smaller than the basic low-frequency waves, the frequency components are integrated and the amplitude of frequency component is detected. When the amplitude exceeds the threshold value, the apparatus identifies the return light which returns from the optical connector on the output side as Stokes light caused by stimulated Brillouin scattering.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：识别系统中检测到的反射光是由光连接器或SBS的断开引起的，然后根据识别结果控制系统。解决方案：光传输装置获得通过从输出侧的光连接器返回的返回叠加光中去除基本低频波而获得的频率分量。当在每个频带获得指示低频电平的频率分量时，装置识别从输出侧的光连接器返回的返回光为由光连接器断线引起的菲涅尔光。此外，当在小于基本低频波的频带获得指示高频电平的频率分量时，频率分量被积分，并且检测频率分量的振幅。当振幅超过阈值时，装置识别从输出侧的光连接器返回的返回光作为由受激布里渊散射引起的斯托克斯光。版权所有（C）2009，JPO＆INPIT

3. 发明专利

JP2008167312A Optical signal receiving device 审中-公开
标题翻译：光信号接收装置
公开(公告)号：JP2008167312A
公开(公告)日：2008-07-17
申请号：JP2006356379
申请日：2006-12-28
申请人： Fujitsu Ltd , 富士通株式会社
发明人： HAKOMORI KATSUHIKO
IPC分类号： H04B10/40 , H04B10/07 , H04B10/50 , H04B10/524 , H04B10/60 , H04B10/67 , H04B10/69
CPC分类号： H04B10/6911
摘要： PROBLEM TO BE SOLVED: To provide an optical signal receiving device which can detect a bit rate of a reception signal inexpensively and can change a reception bandwidth into an adequate reception bandwidth corresponding to a reception bit rate.
SOLUTION: An optical signal receiving device has a bit rate detection circuit detecting a bit rate from a consumption current which flows through a CMOS inverter (CMOS-INV) connected to an output of a PIN photodiode (109) converting an input optical signal into an electric signal, and a control circuit controlling a reverse bias voltage applied to variable capacitance diodes (133, 69, 714, 816, and 817) provided to a PIN photo diode or any position of a receiving device based on the detected bit rate.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：解决的问题：提供一种光信号接收装置，其能够廉价地检测接收信号的比特率，并且可以将接收带宽改变成与接收比特率对应的适当的接收带宽。解决方案：光信号接收装置具有比特率检测电路，该比特率检测电路从流过通过连接到PIN光电二极管（109）的输出的CMOS反相器（CMOS-INV）的消耗电流检测比特率，转换输入光信号转换为电信号，以及控制电路，其控制提供给PIN光电二极管或基于检测到的位的接收装置的任何位置的可变电容二极管（133,69,714,816和817）施加的反偏压率。版权所有（C）2008，JPO＆INPIT

4. 发明专利

JP2007005904A Optical communication apparatus 审中-公开
标题翻译：光通讯设备
公开(公告)号：JP2007005904A
公开(公告)日：2007-01-11
申请号：JP2005180808
申请日：2005-06-21
申请人： Fujitsu Ltd , 富士通株式会社
发明人： HAKOMORI KATSUHIKO
IPC分类号： H04B10/40 , H04B10/07 , H04B10/272 , H04B10/50 , H04B10/60 , H04B10/67
CPC分类号： H01S5/0683 , H01S5/06804
摘要： PROBLEM TO BE SOLVED: To provide a technology capable of detecting ambient temperature of an LD with high accuracy in spite of a simple configuration.
SOLUTION: The optical communication apparatus is configured with: a laser diode 11a for simulating a transmission signal light and outputting the light; a photodiode 11b located near the laser diode 11a; a forward bias supply section 22a for supplying a forward bias voltage to the photodiode 11b when the laser diode 11a stimulates no transmission signal light; and an ambient temperature detection section 23 for detecting ambient temperature of the laser diode 11a on the basis of a terminal voltage of the photodiode 11b to which the forward bias voltage is supplied from the forward bias supply section 22a.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供能够以简单的配置高精度地检测LD的环境温度的技术。光通信装置配置有：激光二极管11a，用于模拟发送信号光并输出光; 位于激光二极管11a附近的光电二极管11b; 当激光二极管11a不刺激透射信号光时，正向偏压供应部分22a用于向光电二极管11b提供正偏压; 以及环境温度检测部23，用于根据从正向偏压供给部22a供给正向偏置电压的光电二极管11b的端子电压来检测激光二极管11a的环境温度。版权所有（C）2007，JPO＆INPIT

5. 发明专利

JP2004153012A Light source control circuit, light source unit, and optical amplifier 审中-公开
公开(公告)号：JP2004153012A
公开(公告)日：2004-05-27
申请号：JP2002316568
申请日：2002-10-30
申请人： Fujitsu Ltd , 富士通株式会社
发明人： NAGAMINE SADAAKI , HAKOMORI KATSUHIKO
IPC分类号： H01L31/10 , H01S3/10 , H01S3/131
摘要： PROBLEM TO BE SOLVED: To provide a light source control circuit reduced in control error yet capable of high-speed operation, and to provide a light source unit and an optical amplifier. SOLUTION: The system for controlling a light source comprises a photodiode 11, a voltage source that applies a voltage to the photodiode 11 so that a current flows according to the power of the light incident on the photodiode 11, a current/voltage conversion circuit 2 that converts the current in the photodiode 11 into a voltage and supplies the voltage to the light source at a high speed, and an integrating circuit 3 for suppressing the offset voltage that occurs in the current/voltage conversion circuit 2. A configuration designed as such provides a system for controlling the light source which is less prone to make control errors, because the integrating circuit 3 cancels the offset voltage in the current/voltage conversion circuit 2. COPYRIGHT: (C)2004,JPO

6. 发明专利

JP2001069180A TRANSMISSION RATE DETECTING CIRCUIT AND DIGITAL TRANSMITTER RECEIVER 失效
公开(公告)号：JP2001069180A
公开(公告)日：2001-03-16
申请号：JP2000011018
申请日：2000-01-19
申请人： FUJITSU LTD
发明人： HAKOMORI KATSUHIKO
IPC分类号： H04L25/40 , H04L7/027 , H04L25/02 , H04L29/08
摘要： PROBLEM TO BE SOLVED: To specify a digital transmission rate through simple constitution by providing a circuit which generates a detected voltage corresponding to a transmission rate and a comparing circuit which compares the detected voltage with a reference voltage and outputs a switching signal for a clock. SOLUTION: The integrated voltages of two capacitors 6-4a and 6-4b are larger and larger as the transmission rate of a digital signal inputted to an inverter is higher and higher, so when the integrated voltages are supplied to an operational amplifying circuit 605 to generate the difference voltage between both integrated voltages, the detected voltage becomes lower and lower as the transmission rate is higher and higher. For the purpose, a comparing circuit 6-6 compares the detected voltage with the reference voltage and then outputs a signal of logical level '1' when the transmission rate is low and a signal of logical level '0' when high. Through this operation, whether the transmission is high or lower can be specified from digital signals of the two transmission rates.

7. 发明专利

JPH0955705A OPTICAL COMMUNICATION MODULE 失效
公开(公告)号：JPH0955705A
公开(公告)日：1997-02-25
申请号：JP20425295
申请日：1995-08-10
申请人： FUJITSU LTD
发明人： ISHIKAWA TOMOHISA , HAKOMORI KATSUHIKO , NISHIMURA TATSUYA
IPC分类号： H04B10/40 , H01S5/068 , H04B10/079 , H04B10/272 , H04B10/50 , H04B10/564 , H04B10/60 , H04B10/67 , H04B10/69 , H04B10/28 , H01S3/133 , H04B10/02
摘要： PROBLEM TO BE SOLVED: To provide an optical communication module which simplifies a TCM communication device. SOLUTION: A driving part 12A is constituted having a laser diode driving circuit 30A which drives a laser diode 18 and outputs a transmission state display signal indicating a transmission state, an automatic output control circuit 31 which controls the driving current of the laser diode driving circuit 30A so that the output power of the light signal outputted by the laser diode becomes constant, an automatic gain control circuit 34 which holds the level of a received signal constant, a switching circuit 36A which performs time-division switching between transmission and reception so that the control of the automatic output control circuit 31 is performed and the control of the automatic gain control circuit 34 is stopped at the time of the transmission while the control of the automatic output control circuit 31 is stopped and the control of the automatic gain control circuit 34 is performed at the time of the reception, and a switching signal generating circuit 50 which is supplied with the transmission state display signal to generate a switching signal and supplies the switching signal to the switching circuit 36A.

8. 发明专利

JPH0694948A OPTICAL MODULE 失效
公开(公告)号：JPH0694948A
公开(公告)日：1994-04-08
申请号：JP24166192
申请日：1992-09-10
申请人： FUJITSU LTD
发明人： HAKOMORI KATSUHIKO
IPC分类号： G02B6/36 , G02B6/42
摘要： PURPOSE:To provide the optical module which is constituted by packaging an optical device and an optical connector to a printed circuit board and is suitable for high-density housing to a shelf. CONSTITUTION:This optical module is constituted of the printed circuit board 2, the optical device 28 packed on the printed circuit board 2, the optical connector 22 fixed to the printed circuit board 2 so as to exist within the notch formed at the edge of the printed circuit board 2 and an optical fiber 12 connecting this optical connector 22 to an input/output port 30 of the optical device 28.

9. 发明专利

JPS60117914A DELAY CIRCUIT 失效
公开(公告)号：JPS60117914A
公开(公告)日：1985-06-25
申请号：JP22609083
申请日：1983-11-30
申请人： FUJITSU LTD
发明人： HAKOMORI KATSUHIKO
IPC分类号： H03K5/13
摘要： PURPOSE:To vary both rise and fall delay times of an input pulse with a small- scale circuit by supplying an integrated output pulse to a comparator which can give the hysteresis variation to the fall and rise threshold levels. CONSTITUTION:An inverted input pulse is supplied to an integration circuit, and an integrated output pulse is supplied to a comparator 6 which can give the hysteresis variation to the fall and rise threshold levels. Then the output pulse of the comparator 6 is delivered. The input pulse is inverted by an inverting circuit 5 into a pulse of B. This pulse is integrated by an integration circuit consisting of a resistance R3 and a capacitor C3, and the output has a slow fall in a fall mode and then a sudden rise in a rise mode as shown by C. The rise time tau4 and the fall time tau5 can be varied by changing the R3 and the C3 of the integration circuit to have a change of both fall and rise of C and also changing the resistance value of resistances R4-R5 respectively to change the threshold level.

10. 发明专利

JP2009290623A Optical receiver 审中-公开
标题翻译：光接收机
公开(公告)号：JP2009290623A
公开(公告)日：2009-12-10
申请号：JP2008141839
申请日：2008-05-30
申请人： Fujitsu Ltd , 富士通株式会社
发明人： HAKOMORI KATSUHIKO
IPC分类号： H04B10/07 , H04B10/40 , H04B10/50 , H04B10/60 , H04B10/67
摘要： PROBLEM TO BE SOLVED: To suppress a malfunction in power supply voltage initiation by cutting off transfer of a signal which is output during unstable operation of a preamplifier when a specified voltage is not reached.
SOLUTION: A photoreceptor 11 converts a received optical signal into a current signal. A preamplifier 12 converts the current signal into a voltage signal and amplifies it. A voltage monitoring section 13 monitors whether or not a power supply voltage of an apparatus reaches a specified voltage, at which the preamplifier 12 starts normal operation, and outputs a control signal that is a monitored result. When a control signal is received which indicates that the power supply voltage does not exceed the specified voltage, a switch section 14 cuts off the output signal of the preamplifier 12; and when a control signal is received which indicates that the power supply voltage exceeds the specified voltage, the switch section 14 passes the output signal of the preamplifier 12 to a post-stage.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：当没有达到指定电压时，通过切断在前置放大器的不稳定操作期间输出的信号的传送来抑制电源电压启动的故障。感光体11将接收到的光信号转换为电流信号。前置放大器12将电流信号转换为电压信号并对其进行放大。电压监视部13监视装置的电源电压是否达到规定的电压，前置放大器12开始正常动作，并输出作为监视结果的控制信号。当接收到指示电源电压不超过指定电压的控制信号时，开关部分14切断前置放大器12的输出信号; 并且当接收到指示电源电压超过指定电压的控制信号时，开关部分14将前置放大器12的输出信号传递到后级。版权所有（C）2010，JPO＆INPIT

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