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1. 发明专利

JPH0918054A LIGHT INTENSITY CONTROL DEVICE AND OPTICAL TRANSMISSION DEVICE 失效
公开(公告)号：JPH0918054A
公开(公告)日：1997-01-17
申请号：JP7278796
申请日：1996-03-27
申请人： MITSUBISHI ELECTRIC CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： MAEKAWA EIJI , SATOH SUSUMU , MOTOSHIMA KUNIAKI , KITAYAMA TADAYOSHI
IPC分类号： H04B10/60 , H01L31/12 , H01L33/00 , H04B10/079 , H04B10/293 , H04B10/40 , H04B10/50 , H04B10/564 , H04B10/572 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/26 , H04B10/28
摘要： PROBLEM TO BE SOLVED: To make a sample-and-hold circuit follow immediately a rise of input to actuate and to make the output level of the circuit hold accurately for a long time even if a mark rate on input data is greatly fluctuated by a method wherein a light intensity control device is provided with an amplifier, which receives the output of the sample-and-hold circuit and controls the luminous level of a light-emitting element which corresponds to marks or spaces of input. SOLUTION: In the case where a sample-and-hold control signal is significant in a first sample-and-hold control circuit 15, that is, in the case where a light output is '1' in mark, a current is led from a first sample-and-hold circuit 12 in the circuit 15 and the circuit 12 is put in a sample mode. That is, the circuit 12 abruptly follows an input. In the case where the light output is '0' in space, the lead-in of the current is stopped from the circuit 12 and the circuit 12 is put in a hold mode. The time constant of the circuit 12 at that time is generally set in a large time constant and the output of the circuit 12 is held constant for a long time.

2. 发明专利

JPH07264202A START CONTROLLER FOR POINT MULTI-POINT TRANSMISSION SYSTEM 失效
公开(公告)号：JPH07264202A
公开(公告)日：1995-10-13
申请号：JP5202294
申请日：1994-03-23
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： OKUMURA YASUYUKI , MAEKAWA EIJI
IPC分类号： H04L29/08 , H04L7/00 , H04L12/28
摘要： PURPOSE:To set a communication channel for a master set and each slave set at a high speed by providing a start control circuit in common to all the slave sets and plural discrete start control circuits each conducting start procedure corresponding to each slave set in parallel to the system. CONSTITUTION:The start controller for the point-multi-point transmission system that sets a communication channel for each slave set according to a prescribed start procedure among one master set 1 and plural slave sets 2-1-2-N is made up of a common start control circuit 5 in common to every slave set and discrete start control circuits 6-1-6-N corresponding respectively to the slave sets 2-1-2-N and they are provided to the master set 1. Then the common start control circuit 5 sends a signal in common to the slave sets 2-1-2-N to them to synchronize each slave set with the master set 1 and informs the result to the discrete start control circuits 6-1-6-N. According to the notice, the discrete start control circuits 6-1-6-N respectively conduct prescribed start procedure independently and respectively for the slave sets 2-1-2-N.

3. 发明专利

JPH02108344A MULTIPLEX TRANSMISSION SPEED DATA COMMUNICATION SYSTEM 失效
公开(公告)号：JPH02108344A
公开(公告)日：1990-04-20
申请号：JP26056888
申请日：1988-10-18
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MAEKAWA EIJI
IPC分类号： H04L29/08 , H04L7/00 , H04L12/40
摘要： PURPOSE:To allow plural pieces of sub-equipment to efficiently communicate through a common transmission path with main equipment by possessing a device to supervise a signal on a common outgoing transmission line and a device to control the sending of the signal to a common incoming transmission line by means of the sub-equipment, and automonously judging the propriety of communication. CONSTITUTION:Sub-equipment 2 to have a transmission speed different from that of the signal on a common outgoing transmission line 11 as the inherent transmission speed does not send a detecting signal from a signal detecting part 13, and since it does not sends a coincident signal from a speed conicidency detecting part 19, it does not transmits the signal to a common incoming transmission line 12, and the signals at the different transmission speeds do not collide on the line 12. Further, when the signal exists on the line 11 and the transmission speed of the signal corresponds to the transmission speed of the self-sub- equipment, the sub-equipment 2 sends the detecting signal from its detecting part 13, and since the consistent signal is sent from a detecting part 19, the equipment 2 can sends the signal onto the line 12, and the communication at the same speed is attained in the common transmission line. The propriety of the communication through the transmission line can be autonomously judged by the equipment 2 by sending a transmission stop signal 21 from a signal transmission control part B 20 to a main circuit part 16 by the device 2.

4. 发明专利

JPH01205620A PHASE COMPARATING CIRCUIT FOR CMI SIGNAL AND TIMING CLOCK 失效
公开(公告)号：JPH01205620A
公开(公告)日：1989-08-18
申请号：JP3019988
申请日：1988-02-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MAEKAWA EIJI , KAKINUMA TAKAMA , OGATA YOSHIFUMI , UNO KOJI
IPC分类号： H03K5/26
摘要： PURPOSE:To generate phase difference information between a CMI(Coded Mark Inversion) signal with an optional period and a timing clock, without generating information other than the phase difference information and zero information and without resetting the circuit constant in response to the period by constituting the circuit except a differential amplifier by logic circuits only. CONSTITUTION:A 1st exclusive OR output circuit 3 is realized by an exclusive OR gate EXE, and a 2nd exclusive OR output circuit 4 consists of the exclusive OR gate EXE and an inverter INV, a 1st pulse generating circuit 5, a 1st pulse generating circuit 5, a pulse elimination circuit 11 and a pulse addition circuit 14 are constituted by logic circuits only. Then a circuit 17 outputting a difference between two output signals 15, 16 of the pulse addition circuit 14 corresponding to output signals 7, 8 of the 1st and 2nd exclusive OR output cirrhosis 3, 4 is realized by a differential amplifier AMP. Thus, the phase difference information between the CMI signal with an optional period and the timing clock is generated without generating the phase difference information and the information except the zero information and without resetting the circuit constant in response the period.

5. 发明专利

JPS6461712A OPTICAL COUPLER AND ITS PRODUCTION 失效
公开(公告)号：JPS6461712A
公开(公告)日：1989-03-08
申请号：JP21797887
申请日：1987-09-02
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOKUBU TOSHINAO , KATSUYAMA YUTAKA , MAEKAWA EIJI , UKAWA KATSUNORI
IPC分类号： G02B6/28
摘要： PURPOSE:To obtain a low-loss optical coupler by providing a biconically tapered part to the section of a specified very small length in an arbitrary longitudinal place of a multicored optical fiber and forming the fiber to a biconical shape in this tapered part in nearly a translation state without twisting the fiber cores. CONSTITUTION:This optical coupler is constituted of a 1st core 1a, the 2nd core 1b, a clad 2 common to the two cores and the multicored fibers 3 and has the biconically tapered part after fusing and stretching. The light propagating in the 1st core 1a leaks to the outside of the 1st core 1a in the biconically tapered part 4, is reflected at the boundary of the outside clad layer 2 and the air and enters the 2nd core 1b or directly enters the 2nd core 1b through the inner clad 2. Various coupling ratios are obtainable by adequately designing the tapered shape of the biconically tapered part 4 which is the light coupling part.

6. 发明专利

JPS62124434A METHOD AND DEVICE FOR INSPECTING SPECIFIC REFRACTIVE INDEX DIFFERENCE OF OPTICAL FIBER 失效
公开(公告)号：JPS62124434A
公开(公告)日：1987-06-05
申请号：JP26376585
申请日：1985-11-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MIKAWA IZUMI , MAEKAWA EIJI , SHINOHARA HIROMICHI
IPC分类号： G01M11/02 , G01M11/00
摘要： PURPOSE:To prevent measurement variance from being generated by finding the specific refractive index difference of an optical fiber to be measured from the relation between the loss of connection with a reference optical fiber and wavelength. CONSTITUTION:The reference fiber 22 and fiber 21 to be measured are connected with each other to receive the light and then the light reception is performed after optical fiber 22 is removed. The connection loss between the optical fibers 21 and 22 is found from the difference between the both, so that the relation between the loss depending upon the wavelength of the light source and the wavelength is measured. Then, the specific refractive index difference is found from the relation between the loss and wavelength, so the dependency upon the incidence condition of a fiber for measurement is eliminated.

7. 发明专利

JPH09307505A OPTICAL TRANSMITTER FOR BURST TRANSMISSION 失效
公开(公告)号：JPH09307505A
公开(公告)日：1997-11-28
申请号：JP11800196
申请日：1996-05-13
申请人： FUJITSU LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： IDE SATOSHI , MAEKAWA EIJI
IPC分类号： H04B10/293 , H04B10/07 , H04B10/2507 , H04B10/524 , H04B10/556 , H04B10/564 , H04B10/572 , H04B10/14 , H04B10/00 , H04B10/04 , H04B10/06
摘要： PROBLEM TO BE SOLVED: To send a transmission signal without deteriorating a duty factor by detecting a zero cross level with high precision even when the number of complicated peak detection circuits is decreased in the optical transmitter. SOLUTION: In the case of transmitting a dummy pulse signal, a duty control signal 20a generated in response to a quantity of duty deterioration of a dummy pulse string monitored by a monitor photo diode 12 is fed back to a duty adjustment circuit 40. In the case of sending a data signal 13b, the duty control signal 20a at that point of time is stored to execute duty adjustment to prevent deterioration in the duty factor.

8. 发明专利

JPH09162911A DATA TRANSMISSION/RECEPTION METHOD IN TIME-DIVISION MULTIPLE ACCESS CONNECTION SYSTEM AND TIME DIVISION MULTIPLE ACCESS CONNECTION SYSTEM 失效
公开(公告)号：JPH09162911A
公开(公告)日：1997-06-20
申请号：JP32036895
申请日：1995-12-08
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： ASHI MASAHIRO , HARA HIROAKI , HIGAKI YOSHINORI , MAEKAWA EIJI
IPC分类号： H04J3/00 , H04L12/40
摘要： PROBLEM TO BE SOLVED: To simplify constitutions in respective slave devices and to execute data communication in a state where reception timing deviation at a master device is always suppressed to a minimum in an operation state. SOLUTION: In the respective slave devices 1, the delay quantity is temporarily set to almost half of the maximum delay time in transmission data correction signal delay parts 16 with delay correction information on transmission line length from the master device. A transmission side frame timing signal (transmission data transmission start timing) is semi-fixedly generated from a timing generation part 15. Only the delay part 16 is delay-controlled with delay correction information on the fluctuation of a transmission line characteristic from the master device in the subsequent system operation state.

9. 发明专利

JPH0936875A ASYNCHRONOUS TRANSFER EQUIPMENT 失效
公开(公告)号：JPH0936875A
公开(公告)日：1997-02-07
申请号：JP18286495
申请日：1995-07-19
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKIGAWA KOUHIROU , MAEKAWA EIJI
IPC分类号： H04Q3/00 , H04L12/28 , H04L12/70 , H04L12/951
摘要： PROBLEM TO BE SOLVED: To reduce the circuit scale, to improve the transmission efficiency and to decrease the processing time by utilizing a multi-frame phase of an input STM signal so as to contain information by a frame period of the received STM signal into one cell. SOLUTION: Received STM signals by a cell conversion circuit 11 are signals of plural series having the same multi-frame structure whose multi-phases are coincident with each other, a cell conversion circuit 11, a cell overhead provision circuit 12, a cell synchronization circuit 14 and a cell inverse conversion circuit 15 are provided to each channel, and a multi-frame phase detection circuit 16 is provided to the system as a means detecting a multi-frame phase of plural series signals. Each cell conversion circuit 11 contains information of one or plural multiframes, based on a detected multi-frame phase as a unit. Thus, when multi-frame phase for all channels can be established simultaneously when cell synchronization is established.

10. 发明专利

JPH02152319A PHASE COMPARING CIRCUIT 失效
公开(公告)号：JPH02152319A
公开(公告)日：1990-06-12
申请号：JP30648888
申请日：1988-12-02
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KAKINUMA RIYUUMA , MAEKAWA EIJI
IPC分类号： H03K5/26 , H03L7/085
摘要： PURPOSE:To shorten a synchronous pulling-in time and to generate phase difference information by obtaining an exclusive logical sum between a timing clock at the change point of an input signal and the identifying signal of a logical level, and executing phase comparison between this exclusive logical sum and the input signal. CONSTITUTION:The logical level of a timing clock 102 at the rising point of an input signal 101 is identified by a D-FF1 and an identified output signal 103 and the clock 102 are outputted as an exclusive logical sum signal 104 by an EX-OR 2. The signal 104 and input signal 101 are outputted as an exclusive logical signal 105 by an EX-OR 3. The signal 105 is passed through a NOT gate 4 and defined as a logical refusing signal 106. For the signals 105 and 106, a difference signal 107 of those signals is obtained as a phase comparing signal by a differential amplifier 5. As a result, an instable pulling-in phase is changed to a stable pulling-in phase.

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