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61. 发明专利

JPH02192332A OPTICAL TRANSMISSION EQUIPMENT 失效
公开(公告)号：JPH02192332A
公开(公告)日：1990-07-30
申请号：JP1171589
申请日：1989-01-20
申请人： MITSUBISHI ELECTRIC CORP
发明人： MOTOJIMA KUNIAKI , SHIYUUJI MIOKI , KITAYAMA TADAYOSHI
IPC分类号： H04B10/572 , H01S5/068 , H04B10/07 , H04B10/293 , H04B10/564
摘要： PURPOSE:To set APC(Automatic Power Control) characteristic at a satisfactory state by sufficiently increasing the driving current of a current amplifier means at respective temperature and to keep an extinction ratio and an optical output peak value constant by connecting a resistant element to a light emitting element in parallel, and providing a modulation current/temperature compensation means. CONSTITUTION:Binary transmission data inputted to a data input terminal 1 is modulated to a binary current via a modulator 2, and is supplied to the light emitting element 3. Also, a light receiving element 4 performs photoelectric conversion of the output light of the element 3 by receiving part of it, and a current amplifier 6 supplies a bias current proportional to the differential current of a signal current converted by the element 4 and a reference current from a reference current source 5 to the element 4. By connecting a resistor 9 in parallel with the element 3, the driving current of the amplifier 6 can sufficiently be increased under any temperature. Also, by providing a modulation current/temperature compensation circuit 10, the binary current of the modulator 2 can be compensated, and the bias point of the element 3 can be kept constant. In such a way, the APC characteristic can be obtained satisfactorily, and also, the distinction ratio and the optical output peak value can be held at a constant level.

62. 发明专利

JPH0252536A DIGITAL OPTICAL TRANSMITTER 失效
公开(公告)号：JPH0252536A
公开(公告)日：1990-02-22
申请号：JP20443688
申请日：1988-08-17
申请人： TOKYO TELECOM NETWORK , MITSUBISHI ELECTRIC CORP
发明人： SAKAI TOMIO , MOCHIZUKI TAKASHI , MOTOJIMA KUNIAKI , MATSUSHITA KIWAMU , KITAYAMA TADAYOSHI
IPC分类号： H04B10/2507 , H04B10/54
摘要： PURPOSE:To reduce the coherence length of a laser diode by using a sent digital signal and driving the laser diode with a current being the result of switching a high frequency signal having a sufficiently high frequency. CONSTITUTION:A digital signal to be sent is given to a digital signal input terminal 2 of a transmitter 1 and a high frequency signal having a sufficiently higher frequency than the signal band of the digital signal to be sent is given to a high frequency signal input terminal 3, the transmitter 1 uses the digital signal to be sent to switch the high frequency signal thereby generating a laser diode(LD) drive current. When the LD 4 receives modulation with a sufficiently high frequency, the multi-longitudinal mode oscillation is attained and the width of each longitudinal mode line is increased and the luminescent spectrum is processed as the multi-mode, then the coherence length of the signal light is selected to be several m or below. Thus, the length of the single mode optical fiber 5 is selected to be nearly 10m, the production of modal noise at discontinuous points of optical connectors 8, 9 or the like on a transmission line is suppressed sufficiently lower.

63. 发明专利

JPH0231529A OPTICAL TRANSMISSION EQUIPMENT 失效
公开(公告)号：JPH0231529A
公开(公告)日：1990-02-01
申请号：JP18120788
申请日：1988-07-20
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIYUUJI MIOKI , KITAYAMA TADAYOSHI
IPC分类号： H04B10/572 , H04B10/00 , H04B10/079 , H04B10/2507 , H04B10/278 , H04B10/29 , H04B10/293 , H04B10/564
摘要： PURPOSE:To reduce the excessive input of an optical signal so as to eliminate the occurrent of an unreceivable state by providing a transmitting carrier detector which detects a transmitting state and constituting a control circuit which reduces the excessive input of optical signals during transmission. CONSTITUTION:Signals inputted from a data terminal 10 are subjected to electrooptic conversion by means of an optical transmitter 3 and outputted as optical signals from a photocoupler 2 to an optical fiber 1 and light receiver 4. At the same time, a transmitting carrier detector 8 detects the transmitting signal of the optical transmitter 3 and sends a carrier detecting signal to a gain control circuit 9 and the circuit 9 reduces the gain of the light receiver. Therefore, the light receiver can receive optical signals even when the input of the optical signals to the light receiver become excessive.

64. 发明专利

JPH01225908A OPTICAL COUPLER 失效
公开(公告)号：JPH01225908A
公开(公告)日：1989-09-08
申请号：JP5324688
申请日：1988-03-07
申请人： MITSUBISHI ELECTRIC CORP
发明人： KITAYAMA TADAYOSHI , KASAHARA MICHIAKI
IPC分类号： G02B6/38
摘要： PURPOSE:To improve the working property of mounting and removing works of an optical transmitter-receiver by providing an optical fiber receiving section in the box body of the device and holding and fixing an optical fiber fixing tube through which optical signals are inputted to and outputted from the device by means of and to a power feeding device. CONSTITUTION:An optical transmitter-receiver 12 and power feeding device 17 which inputs and outputs optical signals and electric signals from and to the device 12 are provided and a split sleeve 13, a 1st optical fiber fixing tube 14 whose leading end is inserted into the sleeve 13, and spring 15 which always pushes the tube 14 in the sleeve inserting direction are provided in the box body 12a of the device 12. Moreover, a 2nd optical fiber fixing tube 19 whose leading end is inserted into the sleeve in an insertion/removal-free state and connected with the 1st optical fiber fixing tube 14 in a plug-in state is held by and fixed to the power feeding device 17. Therefore, when this optical transmitter-receiver 12 is mounted or removed, the 1st optical fiber fixing tube 14 provided in the box body 12a of the device 12 is connected with or disconnected from the 2nd optical fiber fixing tube 19 which is held by and fixed to the power feeding device 17 in the split sleeve 13 housed in the box body 12a in the plug-in state.

65. 发明专利

JPH01125010A VARIABLE GAIN AMPLIFIER 失效
公开(公告)号：JPH01125010A
公开(公告)日：1989-05-17
申请号：JP28262087
申请日：1987-11-09
申请人： MITSUBISHI ELECTRIC CORP
发明人： NOGAMI MASAMICHI , MOTOJIMA KUNIAKI , KITAYAMA TADAYOSHI
IPC分类号： H03G3/10
摘要： PURPOSE:To reduce the fluctuation quantity of an output working point voltage even if a current distribution rate is varied by controlling the gain by raising the base voltage when a base - emitter voltage of an output transistor is high, and lowering the base voltage when the base - emitter voltage is low. CONSTITUTION:As for transistor 16, its emitter is connected to collectors of transistors 4, 5, and its base and collector are connected to the base of a transistor 7. Also, a resistance 14 and 15 form a resistance series circuit, and its one end and the other end are connected to the base of the transistor 7 and the collector of the transistor 7, respectively. As for the transistor 17, its emitter, collector and base are connected to the emitter of the transistor 16, a mutual junction point of the resistance 14, 15 and the base of the transistor 16, respectively. The fluctuation quantity Vout of an output working point voltage when a current distribution rate (m) is varied is only about 24[mV], and extremely small.

66. 发明专利

JPS63294139A OPTICAL REPEATER FOR STAR COUPLER 失效
公开(公告)号：JPS63294139A
公开(公告)日：1988-11-30
申请号：JP13091087
申请日：1987-05-27
申请人： MITSUBISHI ELECTRIC CORP
发明人： MATSUMOTO YASUSHI , KITAYAMA TADAYOSHI , SHIBAO SHINJI
IPC分类号： H04B10/27 , H04B10/272 , H04B10/29
摘要： PURPOSE:To prevent the deterioration of throughput when a collision occurs between devices on a lower-rank plex side and the violation of code rule takes place in the output of a lower-rank plex side receiving circuit, by correcting the code rule violation by means of a code rule violation correcting circuit. CONSTITUTION:A code rule violation correcting circuit 9 which inputs the output of a lower-rank plex side receiving circuit 5 monitors the code rule and, when a code rule violation is detected, code rule violation correcting circuit 9 which corrects code rule violation to be outputted is provided. When a collision occurs between lower-rank plex side devices 5, the code rule violation correcting circuit 9 detects the code rule violation produced as a result of the collision and corrects the violation. Therefore, signals having no code rule violation are inputted to a higher-rank network side transmitting circuit 13 and the deterioration of throughput can be prevented.

67. 发明专利

JPS63281533A OPTICAL REPEATER FOR COUPLER 失效
公开(公告)号：JPS63281533A
公开(公告)日：1988-11-18
申请号：JP11745987
申请日：1987-05-14
申请人： MITSUBISHI ELECTRIC CORP
发明人： MATSUMOTO YASUSHI , SHIBAO SHINJI , KITAYAMA TADAYOSHI
IPC分类号： H04B10/07 , H04B10/27 , H04B10/272 , H04B10/29
摘要： PURPOSE:To prevent a through-put reduction at the time of the signal colliding generation by giving a pattern signal without a code rule violation to a high- order side transmission circuit instead of the output of a low-order side receiving circuit when the signal collision of two low-order network side devices is detected. CONSTITUTION:When a signal collision is generated by a low-order network side star type coupler 20 for a low-order network side device 18 and a low-order side device 19, the light signal to collide at the coupler 20 is photoelectrical- converter with a low-order network side receiving circuit 5. A low-order network side collision detecting circuit 9 discriminates the code rule violation from the output signal of the circuit 5 and makes significant the output. Since the output of the circuit 9 becomes significant, a selector circuit 12 stops to output the output signal of the circuit 5 to a high-order network side transmission circuit 13 and outputs the output of a pattern generating circuit 11 to the circuit 13. By the action, the abnormality such as a code rule violation is not included to the signal inputted to the circuit 13. Thus, even when the signal collision of two low-order network sides occurs, the signal can be repeated without reducing the trough-put.

68. 发明专利

JPS6378615A DRIVING CIRCUIT FOR LIGHT EMITTING ELEMENT 失效
公开(公告)号：JPS6378615A
公开(公告)日：1988-04-08
申请号：JP22437486
申请日：1986-09-22
申请人： MITSUBISHI ELECTRIC CORP
发明人： MOTOJIMA KUNIAKI , IZAWA HIROSHI , KITAYAMA TADAYOSHI
IPC分类号： H04B10/61 , H03K17/78 , H04B10/00 , H04B10/516 , H04L25/02
摘要： PURPOSE:To increase the speed of the rise and the fall of a light output in a light emitting element, by providing a leading edge voltage supplying circuit which adds a prescribed voltage on a driving voltage at the leading edge point of a modulation signal, and a trailing edge current supplying circuit which absorbs an electric charge remaining on the light emitting element by supplying a prescribed pulse current on a driving current. CONSTITUTION:When the modulation signal which emits the light emitting element in t1-t2, and t3-t4, is inputted, since an emitter-follower transistor 1 is energized, and an emitter- follower transistor 6 is cut off, a first emitter current 24 is permitted to flow on the light emitting element 2. And a pulse current +I1 generated at the forefront of the emitter current 24 of the transistor 1 can drive the rise of the output 27 of the light emitting element at high speed by driving the light emitting element 2 more intensely than a stationary current +l0 at the leading edge. At the time of extinction, the driving voltage 21 of the light emitting element goes lower than the cathode potential level VEE 23 of the light emitting element, and the reverse operation of the above operation is performed. And the emitter current 25 of the emitter follower transistor 6 absorbs the electric charge accumulated at a junction part of the light emitting element 2 with the pulse current, the inverse of I2 generated at the forefront, and the fall of the output 27 of the light emitting element can be obtained immediately.

69. 发明专利

JPS62224142A TRANSMITTER-RECEIVER WITH COLLISION DETECTION FUNCTION 失效
公开(公告)号：JPS62224142A
公开(公告)日：1987-10-02
申请号：JP6766186
申请日：1986-03-26
申请人： MITSUBISHI ELECTRIC CORP
发明人： KOZARU YASUTAKA , MATSUMOTO YASUSHI , KITAYAMA TADAYOSHI
摘要： PURPOSE:To stably output an output signal of a collision detection circuit to a communication equipment by using a reception carrier detection protecting circuit even when a reception carrier detection signal is in the non-significant state while a reception signal is received as a collision signal. CONSTITUTION:A reception carrier detection protection circuit 11 is added to a conventional device. When a transmission carrier signal 15 is significant at a period between times 27 and 28, a reception carrier detection signal 17 is significant at a period between times 29 and 32 and non-significant between times 30 and 31 on its way, then the reset of a D-type flip-flop 22 is released at the period between the times 27 and 28, and a trigger signal is inputted at a time 29. Thus, a signal 24 being significant between the times 29 and 28 is outputted from the D flip-flop 22. Even when the significant state (from a time 30 to a time 31) at the reception carrier detection signal 17 takes place, it is protected that no output is fed to a collision detection circuit 13.

70. 发明专利

JPS6153898B2 失效
公开(公告)号：JPS6153898B2
公开(公告)日：1986-11-19
申请号：JP11116781
申请日：1981-07-14
申请人： MITSUBISHI ELECTRIC CORP
发明人： MATSUMOTO MASAHIRO , OOSHIMA KAZUYOSHI , KITAYAMA TADAYOSHI , MATSUI TERUHITO , ITO KATSUYOSHI
IPC分类号： H04B10/27 , H04B10/00 , H04B10/03 , H04B10/038 , H04B10/079 , H04B10/275 , H04B10/524 , H04L12/42

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