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81. 发明专利

JPH09211508A INCOHERENT LIGHT SOURCE AND LIGHT TRANSMITTER FORMED BY USING THE SAME 失效
公开(公告)号：JPH09211508A
公开(公告)日：1997-08-15
申请号：JP1533196
申请日：1996-01-31
申请人： HITACHI CABLE
发明人： KOBAYASHI MASAHIKO
IPC分类号： G02F1/35 , H01S3/06 , H01S3/067 , H01S3/0915 , H01S3/10 , H04B10/00 , H04B10/54 , H04B10/572 , H04B10/588
摘要： PROBLEM TO BE SOLVED: To make it possible to obtain incoherent light of desired spectra with the high-output powder of the output light efficiently converted from power of exciting light. SOLUTION: An optical multiplexer/demultiplexer 102 with which light output Pa from one surface is connected to a rare earth added optical fiber 103 mixed with rare earths and an exciting light source 101 is connected to the other surface of this optical multiplexer/demultiplexer 102. An optical band-pass filter 105 is connected to the rare earth added optical fiber 103. A light reflector 106 is connected to this optical band-pass filter 105. Optical amplification is executed by the rare earth added optical fiber 103 and the incoherent light having the desired wavelength and spectral width is efficiently obtd. by this constitution.

82. 发明专利

JPH09102769A OPTICAL TRANSMITTER 失效
公开(公告)号：JPH09102769A
公开(公告)日：1997-04-15
申请号：JP25798395
申请日：1995-10-04
申请人： HITACHI CABLE
发明人： SUNAGA YOSHINORI , KOBAYASHI MASAHIKO
IPC分类号： H04B10/07 , H04B10/2507 , H04B10/40 , H04B10/50 , H04B10/524 , H04B10/54 , H04B10/58 , H04B10/60 , H04B10/28 , H04B10/04 , H04B10/06 , H04B10/08 , H04B10/14 , H04B10/26
摘要： PROBLEM TO BE SOLVED: To shorten the rise/fall time of an optical output waveform for an optical transmitter containing a current switch circuit by connecting a circuit having a resistor connected in series to an inductor in parallel to a light emit ting element. SOLUTION: Receiving a transmitting signal, a controller circuit 101 actuates a current switch 102 to perform the ON/OFF control of the collector current of a transistor 102b. Based on this control, a light emitting diode 104 blinks and the light that undergone the light intensity modulation and outputted from the diode 104 is transmitted in an optical fiber. A circuit where an inductor 105 and a resistor 106 are connected together in series is connected in parallel to the diode 104. In such a constitution, a large current flows for an instant at the rise of the diode 104. Thus the rise delay of an optical output waveform is corrected. At the same time, a reverse current flows to the diode 104 for an instant due to the undershooting at the rise of the current. Then the electric charge is discharged in the diode 104, and the rise/fall time is shortened for the optical output waveform.

83. 发明专利

JPH08130509A OPTICAL BIDIRECTIONAL TRANSMITTING METHOD AND DEVICE 失效
公开(公告)号：JPH08130509A
公开(公告)日：1996-05-21
申请号：JP26851694
申请日：1994-11-01
申请人： HITACHI CABLE
发明人： SUZUKI TAKEKI , KOBAYASHI MASAHIKO
IPC分类号： H04B10/00 , H04B10/2507 , H04B10/24 , H04B10/02 , H04B10/18
摘要： PURPOSE: To make it possible to execute stable operation without increasing a noise even in the case of bidirectional transmission using a single optical fiber by allowing a part of a received optical signal to pass a specific optical fiber and transmitting it by using generated naturally radiated light. CONSTITUTION: A clown line optical signal 2 transmitted from an optical terminal equipment 13 to an optical terminal equipment 12 through an optical fiber cable 1 to be a medium is branched by an optical coupler 4 through an optical multiplexer/demultiplexer 3 and one optical signal 5a is received by a photodiode 6 for receiving the down line optical signal 2 from the equipment 12. The other branched optical signal 5b is absorbed through an optical fiber 8 to which a rare earth element such as Er is added and generally radiated light having wide spectral width is generated. The generally radiated light is modulated by an optical modulator 9 and the modulated signal is transmitted to the equipment 13 as an up line signal 11 through the cable 1 and received by a photodiode 18 connected through an optical coupler 19.

84. 发明专利

JPH06318755A LIGHT AMPLIFIER 失效
公开(公告)号：JPH06318755A
公开(公告)日：1994-11-15
申请号：JP12415193
申请日：1993-05-26
申请人： HITACHI CABLE
发明人： KOBAYASHI MASAHIKO
IPC分类号： G02B27/28 , G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/094 , H01S3/0941 , H01S3/10 , H01S3/23 , H04B10/29 , H04B10/293
摘要： PURPOSE:To prevent spontaneous emitted light, generated in the latter stage of a light amplifier from exerting an effect on the processing stage of the light amplifier and to improve the upper limit of the amplification gain of the amplifier by a method wherein the reflection type optical amplifier is separated into two stages of the preceeding stage and the latter stage by an optical circulator having forward transmission characteristics from its terminal for inputting signal light. CONSTITUTION:An optical circulator 20 has forward characteristics from a terminal B to a terminal C and functions as one type of an optical isolator between the terminals B and C. As a result, spontaneous emitted light generated in a rate earth-doped optical fiber 15 is prevented by the circulator 20 and is not propagated in the direction of a rare earth-optical fiber 23. Thereby, it is eliminated that the preceeding stage (the side of the fiber 23 and a light reflector 24) of a light amplifier is affected by the latter stage, which consists of the fiber 25 and a light reflector 26 of the light amplifier and the light amplifier can obtain a high amplification gain as a whole.

85. 发明专利

JPH06265747A LIGHT DEMULTIPLEXING TRANSMISSION LINE 失效
公开(公告)号：JPH06265747A
公开(公告)日：1994-09-22
申请号：JP5667293
申请日：1993-03-17
申请人： HITACHI CABLE
发明人： FUKAHORI TOSHIO , MORINAGA HITOSHI , KOBAYASHI MASAHIKO
IPC分类号： G02B6/04 , G02B6/28 , G02B6/42 , H01L31/0232 , H01L33/58 , H01L33/00
摘要： PURPOSE:To form a light demultiplexing transmission line by an optical fiber used in an optical data bus as the one with low loss, low cost, and high reliability. CONSTITUTION:A lens 13 provided with a large degree of aperture and a lens 14 with a small degree of aperture are provided between a light emitting element 7 and a bundle part 15 which bundles the optical fibers closely. A light receiving element 12 is coupled with each emitting terminal of the optical fibers 11 arranged separately via a lens 16. Light emitted from the light emitting element 7 is fully converged on the lens 13, and furthermore, it is changed to parallel beams by the lens 14, and they are entered into the optical fibers 11 of the bundle part 15 with sufficient light power and without generating dispersion. Entered light is emitted from each emitting terminal passing each optical fiber 11, and is received by the light receiving element 12.

86. 发明专利

JPH0514331A TIMING RECOVERY CIRCUIT 失效
公开(公告)号：JPH0514331A
公开(公告)日：1993-01-22
申请号：JP16571991
申请日：1991-07-05
申请人： HITACHI CABLE
发明人： KOBAYASHI MASAHIKO
IPC分类号： H04L7/02 , H04L7/027
摘要： PURPOSE:To obtain the novel timing recovery circuit in which no identification error is caused by making a relation of a phase between an input data and a clock in an identification circuit stable. CONSTITUTION:An input data is divided into two after through an input buffer 1. The one is inputted for the purpose of clock recovery via a prescribed width pulse generating circuit 4, a narrow band pass filter 5, a delay line 6 and a limit amplifier circuit 8 to a flip-flop 7 of an identification circuit. The other data of the divided input data is inputted to the flip-flop 7 of the identification circuit via an AND gate 4 employed for the prescribed width pulse generating circuit and a similar gate to that of the limit amplifier 8 having an inverter in series thereto.

87. 发明专利

JPH0452634B2 失效
公开(公告)号：JPH0452634B2
公开(公告)日：1992-08-24
申请号：JP10112785
申请日：1985-05-13
申请人： HITACHI CABLE
发明人： KOBAYASHI MASAHIKO , NAITO SEIGO
IPC分类号： H01S5/042 , H01S5/068 , H01S5/0683

88. 发明专利

JPH04196849A PARALLEL LIGHT TRANSMISSION SYSTEM 失效
公开(公告)号：JPH04196849A
公开(公告)日：1992-07-16
申请号：JP32308490
申请日：1990-11-28
申请人： HITACHI CABLE
发明人： KOBAYASHI MASAHIKO
IPC分类号： H04B10/03 , H04B10/077 , H04B10/2507 , H04L25/03 , H04L29/00
摘要： PURPOSE:To resist the fluctuation of a light receiving level without deteriorating a transmitting efficiency by photo-electrically converting a clock signal by a light receiving circuit as well as a light receiving element and a preamplifier, detecting the average value of the voltage output, and using the average value as the reference input of a comparator. CONSTITUTION:The average value of the clock signal converted into a voltage signal by a preamplifier 5c, is detected by a low pass filter constituted of a resistance R and a capacitor C, at a reception side. The average value of the clock signal is matched with the just intermediate value between the high level and the low level of a data signal output from a preamplifier 5[subscript 1-(n)]. Therefore, the average value of the clock signal is used as the reference value of a comparator 6[subscript 1-(n), and (c)] which discriminates 1.0 of the data and the clock, so that a threshold can always be held to be an optimal value without being affected by the fluctuation of a light inputting level. Thus, the threshold for discriminating the received data can be adjusted according to the fluctuation of the light inputting level, so that always stable output data can be obtained.

89. 发明专利

JPS63156374A LIGHT-EMITTING-ELEMENT DRIVING CIRCUIT 失效
公开(公告)号：JPS63156374A
公开(公告)日：1988-06-29
申请号：JP30505586
申请日：1986-12-19
申请人： HITACHI CABLE
发明人： KOBAYASHI MASAHIKO , NAITO SEIGO
IPC分类号： H01L33/00
摘要： PURPOSE:To obtain a light-emitting-element driving circuit, which makes the fall characteristic of the element steep without decreasing light emitting efficiency, by providing a circuit in which the light emitting element and a diode are connected in reverse parallel, connecting said circuit to a transistor circuit which is formed in a complementary pattern, and alternately supply current to the light emitting element and the diode. CONSTITUTION:When a pulse voltage Ei shows a state of Ei=0, a transistor 5 is turned OFF, but a transistor 6 is turned ON by a bias voltage Eb2. A voltage E2 causes a current ID to flow through a diode 7 and the transistor 6. At this time the transistor 5 is in an OFF state, but a current IL does not become zero quickly but tends to flow continuously. Since the current ID also flows through the diode 7, a forward voltage drop is generated in the diode 7. The forward current causes a charging current to flow through a light emitting element 1 in the reverse direction by way of a parasitic capacitor. Therefore the current IL cannot continue to flow but reaches zero rapidly.

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