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1. 发明专利

JPS60220634A OPTICAL DATA WAY DEVICE 失效
公开(公告)号：JPS60220634A
公开(公告)日：1985-11-05
申请号：JP7780084
申请日：1984-04-18
申请人： MITSUBISHI ELECTRIC CORP
发明人： NANBARA TOMOHIKO , SEGAMI KOUICHI
IPC分类号： H04B10/27 , G02B6/00 , H04B10/275 , H04B10/29
摘要： PURPOSE:To double the number of data stations which can be installed, by setting the transmittance of half mirror of an optical switch to an optimum value in accordance with individual branch positions. CONSTITUTION:In an optical data way system where data is transmitted and received between data stations connected to a branch optical fiber 3 through plural optical switches provided between loop-shaped main optical fibers 1 and 2, each of optical switches SW consists of rod lenses 15-17 and a half mirror 19a whose transmittance is (m-1)/m and reflection factor is 1/m. The light from the main optical fiber 1 goes to a parallel light by the lens 15, and this light is made incident on the branch optical fiber 3 through the lens 17 by a total reflecting mirror when the optical SW is driven. When the optical SW is not driven, (m- 1)/m of the incident light is transmitted through the half mirror 19a and is made incident on the main optical fiber 2 through the lens 16, and the rest 1/m is reflected and is made incident on the optical fiber 3 and is monitored by an optical receiver. The evaporation area of reflection factor ''1'' of the mirror is changed to set the transmittance to an optimum value.

2. 发明专利

JPH03273720A OPTICAL RECEIVER 失效
公开(公告)号：JPH03273720A
公开(公告)日：1991-12-04
申请号：JP7311090
申请日：1990-03-22
申请人： MITSUBISHI ELECTRIC CORP
发明人： NANBARA TOMOHIKO
IPC分类号： H04B10/07 , H04B10/079 , H04L25/03
摘要： PURPOSE:To easily set a theshold voltage and to attain the stable working of an optical receiving device by securing an AND after comparing the level of the signal current of an avalanche photodiode with the level of the control gain voltage of a variable gain amplifier circuit, the output voltage of a high voltage generating circuit, or the output voltage of a peak value detecting circuit. CONSTITUTION:A resistance 13 is provided to detect the current flowing to an avalanche photodiode 1 together with a 2nd error amplifying circuit 14, a 3rd error amplifying circuit 15, and an AND gate 16 which uses the outputs of both circuits 14 an 15 as the inputs. The the level of the current of the photo diode 1 is monitored together with the gain control voltage of a variable gain amplifying circuit 4, level of the output voltage of a high voltage generating circuit 2, or the level of the output of a peak value detecting circuit 6 respective ly. Thus it is possible of obtain an alarm circuit which can easily detect the presence or absence of an optical input signal with the stable working.

3. 发明专利

JPS63181536A OPTICAL RECEIVING EQUIPMENT 失效
公开(公告)号：JPS63181536A
公开(公告)日：1988-07-26
申请号：JP1363887
申请日：1987-01-23
申请人： MITSUBISHI ELECTRIC CORP
发明人： NANBARA TOMOHIKO
IPC分类号： H04B10/60 , H04B10/07 , H04B10/293 , H04B10/40 , H04B10/50 , H04B10/564 , H04B10/572 , H04B10/67 , H04B10/69
摘要： PURPOSE:To obtain an optical receiving equipment having good sensitivity and wide dynamic range by constituting a negative feedback loop by means of a constant-current circuit in order that the signal current of a photoelectric converting element is not increased by the input of excessive light beam. CONSTITUTION:When the input of the excessive light beam is supplied to an avalanche photodiode 1, the output amplitude from a preamplifier circuit 3 is increased to excess to saturate. Since the output from a second peak value detection circuit 11 which detects the output amplitude becomes larger, difference between a second reference voltage 12 and the output from the circuit 11 becomes larger and the output voltage value of a second error amplification circuit 13 becomes higher. Since the current capacity i1 of the constant-current circuit 14 connected to the second error amplification circuit 13 becomes larger if the output voltage value becomes higher, the current i2 flowing in the first and second load resistances 15 and 16 of the avalanche photodiode 1 is lowered and the saturation of the output from the pre-amplifier circuit 3 can be improved, thus the negative feedback loop can be obtained. When the input of light beam is small, the current capacity of the constant-current circuit 14 is equal to zero and the output from the pre-amplifier circuit 3 is controlled so that it becomes the maximum.

4. 发明专利

JPS61198805A AUTOMATIC GAIN CONTROLLING AMPLIFIER DEVICE 失效
公开(公告)号：JPS61198805A
公开(公告)日：1986-09-03
申请号：JP3817985
申请日：1985-02-27
申请人： MITSUBISHI ELECTRIC CORP
发明人： NANBARA TOMOHIKO , KITAYAMA TADAYOSHI
IPC分类号： H03G3/30
摘要： PURPOSE:To relieve the load of operation of an AGC feedback system by constituting the titled amplifier with a resistor dividing a gain setting reference voltage depending on fluctuation of a power voltage and a level shift circuit so as to suppress the gain fluctuation of an automatic gain control amplifier due to fluctuation of the power voltage. CONSTITUTION:Voltage dividing resistor 15, 16 are two voltage dividing resistors R3, R4 arranged between a gain setting reference voltage source and a power supply and the element value is selected so as to make it equal to a resistance ratio of the input bias resistance. The gain fluctuation of an automatic gain control amplifier is suppressed to zero due to power voltage fluctuation by matching the input DC bias fluctuation of a variable gain amplifier 6 and the gain fluctuation of the automatic gain control amplifier due to power voltage fluctuation and the condition is expressed in equation. In satisfying the condition, the gain fluctuation due to the power voltage fluctuation of the automatic gain control amplifier is suppressed by applying the voltage of a connecting point between the two voltage dividing resistors R315 and R416 to the gain setting reference voltage supply terminal.

5. 发明专利

JPH06216855A OPTICAL TRANSMITTER DEVICE 失效
公开(公告)号：JPH06216855A
公开(公告)日：1994-08-05
申请号：JP414193
申请日：1993-01-13
申请人： MITSUBISHI ELECTRIC CORP
发明人： NANBARA TOMOHIKO
IPC分类号： H03K17/78 , H01S5/068 , H04B10/079 , H04B10/40 , H04B10/50 , H04B10/564 , H04B10/58 , H04B10/60 , H04B10/04 , H01S3/133 , H04B10/06
摘要： PURPOSE:To provide an optical transmitter device which can easily set the threshold value of an alarm showing the deterioration of a laser diode and also can improve the setting accuracy of the threshold value. CONSTITUTION:A light-electricity negative feedback circuit consists of a 2nd laser diode 14 consisting of the adjacent chips of the same wafer. Then the bias current flowing to the diode 14 is converted into a voltage signal by a 2nd resistance 19. The voltage signal is amplified by a 2nd error amplifier circuit and supplied as the threshold value of a comparator 12. The temperature characteristic of the bias current is easily regenerated so that the setting accuracy is improved for the threshold value of an alarm showing the deterioration of the diode 14 and the adjusting time is shortened.

6. 发明专利

JPS6148765A Voltage peak detector 失效
标题翻译：电压峰值检测器
公开(公告)号：JPS6148765A
公开(公告)日：1986-03-10
申请号：JP17058184
申请日：1984-08-16
申请人： Mitsubishi Electric Corp
发明人： NANBARA TOMOHIKO , KITAYAMA TADAYOSHI
IPC分类号： G01R19/04
摘要： PURPOSE: To decrease the ON resistance of a transistor (TR) and to obtain a voltage peak detector which has a short rising time by connecting plural TRs for switching in parallel or increasing emitter diffusion area.
CONSTITUTION: Plural switching TRs 2 are connected to an input signal terminal 11 in parallel and a charging capacitor 3 and a discharging resistance 4 are connected to their emitters in parallel. When a pulse signal is applied to the terminal 1, the TRs 2 turn on to charge the capacitor 3, and the high level potential of the pulse is held, so that a voltage peak is detected. The TRs 2 are connected in parallel, so the ON resistance of the TRs 2 decreases and the rising time is shortened.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：降低晶体管（TR）的导通电阻，并通过连接多个TR并联或增加发射极扩散面积获得具有短上升时间的电压峰值检测器。构成：多路开关TR2并联连接到输入信号端子11，并且充电电容器3和放电电阻4并联连接到它们的发射极。当脉冲信号施加到端子1时，TR2导通以对电容器3充电，并且保持脉冲的高电平电位，从而检测电压峰值。 TR2并联，因此TR2的导通电阻减小，上升时间缩短。

7. 发明专利

JPH07226714A OPTICAL TRANSMITTER 失效
公开(公告)号：JPH07226714A
公开(公告)日：1995-08-22
申请号：JP1535794
申请日：1994-02-09
申请人： MITSUBISHI ELECTRIC CORP
发明人： NANBARA TOMOHIKO
IPC分类号： H04B10/293 , H04B10/07 , H04B10/40 , H04B10/50 , H04B10/516 , H04B10/564 , H04B10/572 , H04B10/60 , H04B10/14 , H04B10/04 , H04B10/06 , H04B10/26 , H04B10/28
摘要： PURPOSE:To always obtain an excellent quenching ratio by monitoring a low frequency signal superimposed on a modulation current or a bias current of a laser diode and controlling a level of the signal to a specified level. CONSTITUTION:A clock signal is converted into a low speed rectangular wave by using a frequency divider circuit 13, a low frequency sine wave with a desired amplitude is generated by using a waveform equalization circuit 14 and an attenuator 15 and an optical output waveform having a prescribed envelope is obtained by superimposing the sine wave onto the bias current. The output waveform is reproduced as an electric signal waveform by a current voltage conversion amplifier circuit 16, and a clip circuit 17 eliminates an upper half of the waveform. A low frequency detection circuit 18 extracts the envelope from the signal, a 2nd capacitor 19 is used to smooth the envelope signal, a difference from a reference voltage is amplified by an error amplifier circuit 21 and the amplifier circuit 21 forms a feedback loop to control an output current of a current switch circuit 4. When a bias current of a laser diode 1 is set in the vicinity of an oscillation threshold current, an excellent extinction ratio is obtained.

8. 发明专利

JPH0423624A OPTICAL TRANSMITTER 失效
公开(公告)号：JPH0423624A
公开(公告)日：1992-01-28
申请号：JP12872790
申请日：1990-05-18
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIYUUJI MIOKI , KITAYAMA TADAYOSHI , NANBARA TOMOHIKO
IPC分类号： H04B10/40 , H04B10/035 , H04B10/079 , H04B10/50 , H04B10/524 , H04B10/54 , H04B10/564 , H04B10/60
摘要： PURPOSE:To reduce number of components and to enhance the reliability by adopting a structure selecting an output light electrically. CONSTITUTION:Transistors TRs 20, 21 in a bias current circuit 19 are connected in Darlington, a difference between a current supplied from a reference current source 22 or/and 23 and an output current of a photodiode 24 is amplified and fed to a laser diode 33. Thus, a changeover switch 31 is selected to select an output light of the laser diode 33. Since a high frequency component of the output light is cut off by a capacitor 25, only the low frequency component is monitored by the photo diode 24, resulting that the bias of the laser diode 33 is controlled.

9. 发明专利

JPH02268481A LASER DIODE DRIVING DEVICE 失效
公开(公告)号：JPH02268481A
公开(公告)日：1990-11-02
申请号：JP9004689
申请日：1989-04-10
申请人： MITSUBISHI ELECTRIC CORP
发明人： NANBARA TOMOHIKO
IPC分类号： H01S5/068
摘要： PURPOSE:To form stable light output through automatic control by supplying a partial pressure value by a thermistor and resistance to input of an error amplification circuit and by controlling a current value of a current source by the output voltage. CONSTITUTION:As for a relationship between a light output level and a current of a laser diode 3, if a driving current exceeds some threshold value, laser oscillation develops and light is output. Here, a bias current IB is set to a value which is slightly lower than the threshold value, and a desired light output can be acquired by superposing a modulation current thereto. If a current source 8 is connected to an output of a current amplification circuit 7 and a current value IO thereof is added, an output current value is controlled to IB+IO in the current amplification circuit 7. In this case, IB tends to increase in proportion to a temperature. Therefore, a load current of the current amplification 7 can be made constant at a proper value for stable operation by providing reverse temperature characteristic to the current source 8.

10. 发明专利

JPH02128538A OPTICAL RECEIVER 失效
公开(公告)号：JPH02128538A
公开(公告)日：1990-05-16
申请号：JP28224488
申请日：1988-11-08
申请人： MITSUBISHI ELECTRIC CORP
发明人： NANBARA TOMOHIKO
IPC分类号： H04B10/556 , H04B10/00 , H04L7/02 , H04L25/40
摘要： PURPOSE:To obtain a stable clock output by inserting an fo frequency component extracting circuit consisting of a fixed delay line and an exclusive OR gate between the output of a light reception amplifying circuit and the input of a mixer circuit. CONSTITUTION:A first fixed delay line 8 to delay the output signal of a light reception amplifying circuit 2 by a certain time is connected, and the output signal of this fixed delay line 8 and the original signal are supplied as the input to a first exclusive OR gate 9. Connection to supply the output signal of the first exclusive OR gate 9, the output of the first fixed delay line 8, and the output signal of a second fixed delay line 10 delaying the output of the gate 9 by a certain time to a second exclusive OR gate 11 as the input is repeated in series a proper number of times, and the output terminal is connected to a mixer circuit 4. Thus, a data pattern having many change points can be generated, and a stable clock output is always obtained independently of the inputted data pattern.

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