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71. 发明专利

JPH0223734A OPTICAL COMMUNICATION SYSTEM 失效
公开(公告)号：JPH0223734A
公开(公告)日：1990-01-25
申请号：JP17465688
申请日：1988-07-12
申请人： FUJITSU LTD
发明人： KONDO RYUICHI , YAMASHITA HARUO , OTSUKA TOMOYUKI , NAITO HIDETOSHI
IPC分类号： G02B6/00 , G02F1/37 , H04J14/00 , H04J14/02
摘要： PURPOSE:To reduce cost and power consumption in an optical communication system by inputting an output from a second optical output modulation means to a secondary higher harmonic generation means, setting the optical wavelength to 1/2 and adding the output of a first optical output modulation means and the output of the secondary higher harmonic generation means to an optical wavelength multiplex means. CONSTITUTION:The optical output of an LED element 10 is added to an optical distributor 15, and the output is divided into two wavelengths, which are respectively given to optical switches 35 and 45. Respective data (1) and (2) are given to optical switch circuits 30 and 40 and the switches 35 and 45 are on/off- controlled. A higher harmonic generation crystal 90 is connected to the output of the switch 45, and second higher harmonic optical signal data of an input frequency is generated here. Data on the output of the crystal 90, lambda2 (0.8mum), for example, and data on the output lambda1 (1.6mum) of the optical switch 35 are transmitted to a wave synthesizer 50, whereby lambda1 and lambda2 are multiplexed. On the other hand, a wave-synthesizer 60 on a reception side separates data, which are respectively added to PIN diodes 70 and 80, changes them into data of electric signals for reception.

72. 发明专利

JPH022226A OPTICAL OUTPUT STABILIZING CIRCUIT 失效
公开(公告)号：JPH022226A
公开(公告)日：1990-01-08
申请号：JP14334288
申请日：1988-06-10
申请人： FUJITSU LTD
发明人： YAMASHITA HARUO , OTSUKA TOMOYUKI , KONDO RYUICHI , NAITO HIDETOSHI
IPC分类号： H04B10/293 , H04B10/07 , H04B10/2507 , H04B10/564 , H04B10/572 , H04L25/03 , H04L25/49
摘要： PURPOSE:To prevent deterioration in the optical output waveform against the fluctuation of the combination of mark rates by detecting each mark rate of 2 systems of data strings and using a sum signal of the detection signal so as to adjust a reference voltage, varying the bias current of a light emitting diode to adjust the optical output. CONSTITUTION:A mark rate detection circuit 16 consists of low pass filter comprising a resistor R1 and a capacitor C1 and a mark rate detection circuit 17 consists of low pass filter comprising a resistor R2 and a capacitor C2. An optical output detection circuit 15 consists of a photodiode PD, a resistor R and a capacitor C to extract a mean value and when the optical level is increased, an output VPD is lowered, and the optical level is decreased. When the optical level is decreased, the relation is opposite to above and then the constant control (APC) of the optical level is implemented in this way. The reference voltage of the APC is given by an offset circuit 19. The sum of outputs VMD1, VMD2, of the mark rate detection circuits 16, 17 revises the reference voltage to correct the mark rate.

73. 发明专利

JPS6442912A SWITCHING CIRCUIT BY FIELD EFFECT TRANSISTOR 失效
公开(公告)号：JPS6442912A
公开(公告)日：1989-02-15
申请号：JP19944187
申请日：1987-08-10
申请人： FUJITSU LTD
发明人： KONDO RYUICHI , OTSUKA TOMOYUKI , TANIGUCHI MITSUKI , NAITO HIDETOSHI
IPC分类号： H03K17/10
摘要： PURPOSE:To attain the switching at a high speed and with large amplitude by obtaining an output voltage over a permissible value between gate and drain of a FET. CONSTITUTION:When a field effect transistor (FET) 200 is turned off by an input signal fed to a gate, the FET 100 is turned off by a control signal being an output of an output control means 400 and an output control means 300 and the output becomes a voltage of power supply Vdd. On the other hand, when the FET 200 is turned on by the input signal, the output goes to the voltage of the power supply Vss by the control signal being the output of output control means 300, 400. Thus, a prescribed voltage is set for the Vdd and Vss and the output voltage of the output control means 300, 400 is set to a prescribed value, then the output voltage over the permissible value between the gate and drain of the FETs 100, 200 is obtained. Thus, the high speed switching is applied with large amplitude.

74. 发明专利

JPS63226135A BIDIRECTIONAL OPTICAL COMMUNICATION SYSTEM 失效
公开(公告)号：JPS63226135A
公开(公告)日：1988-09-20
申请号：JP6043787
申请日：1987-03-16
申请人： FUJITSU LTD
发明人： KONDO RYUICHI , OTSUKA TOMOYUKI , TANIGUCHI MITSUKI , NAITO HIDETOSHI
IPC分类号： H04B10/00 , H04B10/54
摘要： PURPOSE:To make it unnecessary to provide a light emitting element on the other station by using a part of energy of a signal light which has been sent to the other station from one opposed station, as a light source in the case of sending it to one station from the other station. CONSTITUTION:One of distributed signal light beams is delayed by an optical fiber 28, and thereafter, synthesized, so that the intensity of the composite light does not become zero. That is, by taking notice of a fact that the signal light transmitted from a master station 12 to a slave station 14 has a ternary level, and also, this time slot is an equal internal, and adjsuting the length of optical fibers 26, 28 so that the time slot of the signal light in input points D1, D2 of an optical coupler 30 is shifted by just a one-period portion, the intensity D3 of the composite light always becomes >= middle level. Therefore, this composite light can be used as a light source of a modulator 34. The information can be transmitted surely by a modulated light obtained by turning on and off such a composite light.

75. 发明专利

JPS63185133A TIME DIVISION MULTIPLEXING SYSTEM 失效
公开(公告)号：JPS63185133A
公开(公告)日：1988-07-30
申请号：JP1665687
申请日：1987-01-27
申请人： FUJITSU LTD
发明人： TANIGUCHI MITSUKI , OTSUKA TOMOYUKI , NAITO HIDETOSHI , KONDO RYUICHI
IPC分类号： H04J3/06
摘要： PURPOSE:To demultiplex the channel while using the phase of the clock at the reception side by superimposing a signal being the result of time division multiplex of an n-channel signal with the clock having a frequency being 1/n of that of the transmission line speed. CONSTITUTION:The data of 1st-n-th channel data having a frequency of fb/n(b/ s) are inputted in parallel with a parallel/serial converter 10 and is formed to be serial processing by using the clock CLK of a frequency fb(Hz) to output a multiplex signal of frequency fb(b/s). Then a clock of fb/n(Hz) is outputted from the parallel/serial converter 10 and added to the said multiplex signal by an adder 28. The clock of fb/n(Hz) is extracted at the reception side and n-set of clocks with different phase are formed, the data is fetched in a D flip-flop by using the clock to reproduce each bit of the 1st-n-th channel and the multiplex signal is demultiplexed without adding a synchronizing signal bit.

76. 发明专利

JPS63169836A OPTICAL COMMUNICATION SYSTEM 失效
公开(公告)号：JPS63169836A
公开(公告)日：1988-07-13
申请号：JP104387
申请日：1987-01-08
申请人： FUJITSU LTD
发明人： KONDO RYUICHI
IPC分类号： H04B10/00 , H04B10/524 , H04B10/54 , H04B10/80
摘要： PURPOSE:To reduce power consumption by giving a comparatively large optical power including DC component to an optical signal sent from a station 1, allowing other station 2 to receive the optical signal, demultiplexing it into two, giving one to a saturation absorbing body so as to obtain a light whose optical power is constant, thereby eliminating the need for a light emitting element in the station 2. CONSTITUTION:The light emitting element 12 in a station 1 such as master station is driven by a driving section 11 receiving a transmission signal and DC, subjected to intensity modulation by a transmission signal and an optical signal including the DC component is outputted. The optical signal is sent to other station 2 such as a slave station via an optical transmission line 3 being a forward path. Then the signals demultiplexed into two by a demultiplexing section 7 in the station 2, one optical signal is subjected to conventional reception processing for the optical signal and the other optical signal is fed to a saturation absorbing body 5. In the saturation absorbing body 5, the optical power having a threshold or above is absorbed and the DC component of the optical signal subjected to intensity modulation is outputted. The output light of the saturation body 5 is fed to a modulation section 6, an optical switch 6a is driven by a driving section 10 to apply the intensity modulation of the light according to the transmission signal and the result is sent to the station 1 via an optical transmission line 4 being the return path.

77. 发明专利

JPS6298930A OPTICAL DISTRIBUTION SYSTEM 失效
公开(公告)号：JPS6298930A
公开(公告)日：1987-05-08
申请号：JP23891685
申请日：1985-10-25
申请人： FUJITSU LTD
发明人： IGUCHI KAZUO , OTSUKA TOMOYUKI , KIYONAGA TETSUYA , KONDO RYUICHI
IPC分类号： H04B10/556 , H04B10/00 , H04L25/02
摘要： PURPOSE:To utilize effectively an optical output of a light source by using a differential code formed by a differential encoder as a modulation signal of an optical modulator and sending each differential optical output of the optical modulator as an output respectively. CONSTITUTION:The optical modulator 2 employs a guide type optical switch and an optical output of a light source 1 such as a laser is inputted, an original signal enters the differential encoder 3 and the output of the differential encoder 3 is fed to the optical modulator 2 as a modulation signal. A non-inverting optical output and an inverting output outputted from the optical modulator 2 are sent to the reception side respectively via a separate transmission line. The non-inverting optical output is received by a photodetector 4 at the reception side, and after an optical signal is converted into an electric signal, a differential inverse converter 5 restores the signal into the original signal. Further, the inverting optical output is received similarly by the photodetector 6, and after the optical signal is converted into an electric signal, the signal is restored into the original signal by a differential inverse converter 7 to distribute the optical signal easily. Thus, the optical distribution system having high efficiency where the optical output of the light source is utilized effectively by nearly 100% is attained.

78. 发明专利

JPS6134176B2 失效
公开(公告)号：JPS6134176B2
公开(公告)日：1986-08-06
申请号：JP5664981
申请日：1981-04-15
申请人： FUJITSU LTD
发明人： TSUDA JUNICHI , HISAYUKI JIRO , SUCHI KOZO , UEKI SADAYUKI , KONDO RYUICHI , TAKANO KENJI
IPC分类号： G06F11/34 , G06F11/07

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