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11. 发明专利

JPS63129711A QUANTIZATION SYSTEM 失效
公开(公告)号：JPS63129711A
公开(公告)日：1988-06-02
申请号：JP27623586
申请日：1986-11-19
申请人： NIPPON TELEGRAPH & TELEPHONE , MITSUBISHI ELECTRIC CORP
发明人： OKADA KENJI , AOYANAGI SHINICHI , NIIFUKU TAKESHI , OSHIMA KAZUYOSHI
IPC分类号： H03M7/36 , H03M7/38
摘要： PURPOSE:To attain more efficient quantization by assigning two quantized value to one code so as to expand the quantized level number to nearly twice. CONSTITUTION:To the range of difference values to be generated, +2M-1--(2M-1), 2N -1 (=2k+1) sets of symmetrical quantized values in the polarity around gero are provided. Then one N-bit code is assigned to the quantized characteristic value zero and the same N-bit code is assigned to quantized characteristic values Xi, -Xj satisfying the relation of Xi-(-Xj)=2M with respect to the quantized characteristic values Xi, -Xj of different code. Thus, the quantization level of the N-bit code is made equivalent to the case with using the (N+1)-bit code and the tracking performance is improved. even against a steep change in the picture with a low bit rate.

12. 发明专利

JPS6329737A OPTICAL WAVELENGTH SELECTING ELEMENT 失效
公开(公告)号：JPS6329737A
公开(公告)日：1988-02-08
申请号：JP17317986
申请日：1986-07-23
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HASHIMOTO HITOSHI , TOKURA NOBUYUKI , AOYANAGI SHINICHI
IPC分类号： G02F1/21 , G02F1/01 , G02F1/13 , G02F1/25
摘要： PURPOSE:To make incident light again incident on an optical resonator even if the polarized state o the incident light intersects the oriented direction of liquid crystal so as to realize variable selecting operations, by installing an optical rotator having a reflecting layer in part of the plate of incident light. CONSTITUTION:Two base plates 1, on which ferroelectric multilayer film filters 2, transparent electrodes 3, and orientation processing agent layers 4 are succes sively formed, respectively, are arranged in a state where the layers 4 are faced to each other and liquid crystal 5 is enclosed between the base plates 1. The two filters 2 form an optical resonator. A Farady rotator 12 and reflecting mirror 11 which provide a rotation of 45 deg.+90 deg.Xk (k: an integer) to transmitted light are formed on the base plate 1 on the incident side of optical signals. When such constitution is used, incident light is made incident to a light receiving system 9 through an incident-light fiber 7, lens system 8, and optical resonator. The light reflected by the optical resonator is passed the rotator 12 twice after it is reflected by the mirror 11. Therefore, the light is again made incident to the resonator, with its polarized direction being turned by 90 deg.+180 deg.Xk. Nonselected optical signals are emitted from the rotator 12 after the above-mentioned reflection is repeated.

13. 发明专利

JPH07250028A DUPLEX PASSIVE DOUBLE STAR OPTICAL TRANSMISSION SYSTEM 失效
公开(公告)号：JPH07250028A
公开(公告)日：1995-09-26
申请号：JP3723594
申请日：1994-03-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AOYANAGI SHINICHI , OKUMURA YASUYUKI
IPC分类号： H04B10/27 , H04B10/032 , H04B10/07 , H04B10/272 , H04B10/29 , H04L29/14 , H04B10/20
摘要： PURPOSE:To prevent any fault at one part from being propagated to the entire system while securing reliability and further to house the system even in a user equipment provided with just one pair of a transmitter and a receiver by providing a mutual connecting means for mutually connecting two pairs of transmitting/receiving means and two pairs of light joining/branching means at a center equipment. CONSTITUTION:Since two pairs of photocouplers (mutual connecting means) 4-0 and 4-1 are used between optical star couplers 1a-0, 1b-0, 1a-1 and 1b-1 and a center equipment 2, the '0' system transmitting/receiving means of the center equipment 2 is connected with the '0' system and '1' system transmitting/receiving means of user equipments 3z-3k and 3n, and the '1' system transmitting means of the center equipment 2 is connected with the '0' system and '1' system transmitting/receiving means of the user equipments 31-3k and 3n. Thus, the fault of a part common for the respective user equipments 31-3k and 3n is distinguished from the fault of a part individual for the respective user equipments 31-3k and 3n, and an active system can be individually switched to a spare system within a required range. Therefore, the range to be affected by hit or the like with switching can be suppressed at a minimum.

14. 发明专利

JPH06326681A CENTRALIZED MONITORING OR CENTRALIZED CONTROL CIRCUIT 失效
公开(公告)号：JPH06326681A
公开(公告)日：1994-11-25
申请号：JP11454693
申请日：1993-05-17
申请人： MITSUBISHI ELECTRIC CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： AOYANAGI SHINICHI , ICHIBAGASE HIROSHI , KOSUDA SHINICHI
IPC分类号： H04J3/12 , H04J3/14 , H04Q9/00
摘要： PURPOSE:To reduce the number of monitoring or control interfaces with an outside part and to easily cope with the increase, decrease and change of monitoring or control object circuits by providing a centralized monitoring information transmission circuit or a control information reception circuit and respective interface memories and distributing and transferring the information to the respective monitoring object circuits or control object circuits again. CONSTITUTION:Inside a transmission line terminating substrate, transmission line terminating information, path terminating information and self monitoring information, etc., are generated. Then, the monitoring object circuit 8 writes the information at the position of the specified address of a monitoring object memory 14. Also, the control object circuit 7 reads data written in a control object memory 13, instructs overhead information, duplex changeover and the lighting conditions of a lamp, etc., and performs various kinds of setting. In the meantime, a sequence ROM 16 reads arithmetic data stored in the set address and delivers them to an arithmetic circuit 15. The arithmetic circuit 15 performs data transfer and arithmetic operations between a register for the arithmetic operation within the circuit and the respective control object memories.

15. 发明专利

JPH06318908A BURST SIGNAL DETECTING CIRCUIT 失效
公开(公告)号：JPH06318908A
公开(公告)日：1994-11-15
申请号：JP13268293
申请日：1993-05-10
申请人： ANRITSU CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： OKUBO KO , AOYANAGI SHINICHI
IPC分类号： H03D3/06 , H04B10/272 , H04B10/40 , H04B10/50 , H04B10/60 , H04J3/00 , H04L7/04 , H04B10/04 , H04B10/06
摘要： PURPOSE:To detect the arrival of a burst signal with a different amplitude for each ONU(optical network unit) provided with a DC component in the burst multiplex transmission system of a PDS(passive double star) system in a short time. CONSTITUTION:An NRZ burst signal (a) outputted from an optical receiver 1 is turned to a signal (b) by performing DC cut-off at a capacitor 2. By providing a phase circuit 3 to apply phase transition to the signal (b) and calculating difference between the signal (b) and a phaser output signal (c) by using a differential amplifier 4, a bipolar signal (d) canceled the DC component is provided. A counter circuit 8 is operated by the bipolar signal (a) and after the prescribed number of pulses are counted, a burst detect signal (k) is outputted.

16. 发明专利

JPH0530552A SPACE DIVISION TYPE OPTICAL SIGNAL SELECTING CIRCUIT 失效
公开(公告)号：JPH0530552A
公开(公告)日：1993-02-05
申请号：JP17966591
申请日：1991-07-19
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SUZUKI YASUNAO , SANO KOICHI , AOYANAGI SHINICHI
IPC分类号： G02B6/28 , H04B10/27 , H04B10/272 , H04B10/29 , H04N7/22 , H04N21/647 , H04Q3/52
摘要： PURPOSE:To provide a compact and low-power consumptive circuit capable of selectively connecting different optical signals respectively inputted to M optical fibers to all of N numbers of outputs. CONSTITUTION:This space division type optical signal selecting circuit is provided with an optical branching circuit 2 for N-branching respective signals outputted from M optical fibers 8, M numbers of N-channel one-dimensional optical switches 6 for turning on and off respective outputs thereof and N numbers of one-dimensional optical OR circuit 7 for combining respective M- channel optical signals. In this constitution, N optical outputs can be obtained from M optical inputs. Consequently this selecting circuit can be utilized for image distribution service.

17. 发明专利

JPH04257139A DIGITAL SIGNAL TRANSMISSION/RECEPTION CIRCUIT 失效
公开(公告)号：JPH04257139A
公开(公告)日：1992-09-11
申请号：JP1811191
申请日：1991-02-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： ISHIKURA AKIHIKO , AOYANAGI SHINICHI
IPC分类号： H04L7/08
摘要： PURPOSE:To output a synchronized reception signal by setting the extent of delay in accordance with phase relations among a reception-side clock, a reference frame, and the reception signal at the time of the start of transmission of a digital signal from a transmission circuit to a reception circuit. CONSTITUTION:A programmable delay circuit 21 has delay lines connected in series in 30 stages, and a delay extent control circuit 24 takes out two signals in accordance with the extent of delay to be successively varied and set. A digital signal discriminating circuit 63 discriminates these two signals at the timing synchronized with the reference clock supplied from a clock frame phase source 65. A discrimination timing detecting circuit 22 fetches two discriminated output signals and decides whether two output signals are kept in the matched state within a prescribed time or not and reports the result to the circuit 24. After the extent of delay is settled by the circuit 24, it is transmitted to a transmission circuit 10, and switching to a signal source 51 is performed, and a reception circuit 20 discriminates the signal to be transmitted synchronously with the clock and the frame phase.

18. 发明专利

JPH0380377B2 失效
公开(公告)号：JPH0380377B2
公开(公告)日：1991-12-24
申请号：JP20237483
申请日：1983-10-28
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SATO KENICHI , AOYANAGI SHINICHI
IPC分类号： H04B10/556 , H04B10/00 , H04B10/07 , H04B10/2513 , H04B10/2581 , H04B10/524 , H04L25/06

19. 发明专利

JPH02297027A OPTICAL RECEIVER 失效
公开(公告)号：JPH02297027A
公开(公告)日：1990-12-07
申请号：JP11725989
申请日：1989-05-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KIKUSHIMA KOJI , AOYANAGI SHINICHI
IPC分类号： G01J1/44 , G02F1/35 , H01L31/10 , H04B10/2507 , H04B10/29 , H04B10/291 , H04B10/516 , H04B10/61
摘要： PURPOSE:To prevent the adverse influence by the ghost light generated in an optical fiber amplifier by branching received light to two signals at a prescribed ratio by an optical receiver having the optical fiber amplifier added with a rare earth element, emitting the one thereof to an optical delay circuit and the other to an amplifier circuit and providing a differential amplifier which outputs the difference between the outputs of both and the output signal. CONSTITUTION:The incident signal light on the optical receiver B is branched by a 2X2 star coupler 3 to the two signals which are respectively made incident on the optical amplifier circuit C and an optical delay line 4. While the optical fiber amplifier 8 amplifies the incident signal light and emits this light to an optical filter 9, the amplifier superposes the ghost light generated by multiple reflections between an incident terminal 8a and an exit terminal 8b as well. On the other hand, the delay time of the signal light of the optical delay line 4 is set the same as the delay time of the ghost light of the amplifier 8 and the ratio of the branching in the coupler 3 is also set according to the intensity of the light. The outputs from photodetectors 5, 10 of the two circuits are offset and adjusted in the differential amplifier 11 in this way and the component of the ghost light is not included in the received signal outputted from the amplifier 11. The signal having the good characteristics is thus obtd.

20. 发明专利

JPH02291505A LIGHT SIGNAL DISTRIBUTION SYSTEM 失效
公开(公告)号：JPH02291505A
公开(公告)日：1990-12-03
申请号：JP11181989
申请日：1989-04-28
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AOYAMA KOICHI , AOYANAGI SHINICHI
IPC分类号： G02B6/00 , G02F1/35 , H04B10/25 , H04B10/27 , H04B10/29 , H04B10/291
摘要： PURPOSE:To increase the number of ports to which a signal can be distributed by branching a light signal which is propagated in an optical fiber, and propagating the branch light signal through a single-mode optical fiber which has >=0.6mum cutoff frequency and no polarization dependency and then amplifying the signal according to the intensity of incident exciting light by a rare earth element added optical fiber amplifier. CONSTITUTION:One branch light signal from an optical branching circuit 2 is propagated through optical fibers 4 and 10 which have >=0.6mum cutoff wavelength and no polarization dependency and made incident on the rare earth element added optical fiber amplifier 9. The exciting light is made incident on this amplifier 9, which converts part of the energy into the incident light signal and amplifies the light signal with a specific gain. The amplified light signal is transmitted to an optical receiver 3 at a branch destination or a trailing-stage optical fiber for transmission. Consequently, the light signal distribution system which can easily be inserted into the transmission line, compensates light loss generated by the optical branching circuit 2, and can increase the number of distribution ports is obtained.

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