专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JP2001007829A OPTICAL MONITOR CHANNEL TRANSFER DEVICE 失效
公开(公告)号：JP2001007829A
公开(公告)日：2001-01-12
申请号：JP17275999
申请日：1999-06-18
申请人： HITACHI LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： TSUSHIMA HIDEAKI , NUNOKAWA HISAYUKI , KUWANO SHIGERU , SHIMANO KATSUHIRO , JINNO MASAHIKO
IPC分类号： H04B10/07 , H04B10/032 , H04B10/077 , H04B10/275 , H04B10/291 , H04J3/00 , H04L12/42 , H04L12/437 , H04B10/08
摘要： PROBLEM TO BE SOLVED: To provide an optical monitor channel transfer device that can transfer management information at a low cost between basic devices of an optical transmission network such as an optical branching insertion device and a repeater or the like. SOLUTION: An optical monitor channel transfer device 1 is provided with a optical reception circuit 4 that receives an optical monitor channel optical signal sent from an upstream device to obtain a optical monitor channel signal, a circuit 5 that separates an overhead part from the optical monitor channel signal, a processing circuit 6 that executes write/read of the management information of an optical transmission section and an optical multiplex section to/ from the overhead part, a circuit 7 that inserts the overhead part outputted from the processing circuit 6 to the optical monitor channel signal, and an optical transmission circuit 8 that converts the optical monitor channel signal outputted from the circuit 7 into an optical monitor channel signal of other wavelength than that of a main signal and transmits the converted signal to a downstream device.

2. 发明专利

JPH0856214A ERROR RATE MEASUREMENT DEVICE 失效
公开(公告)号：JPH0856214A
公开(公告)日：1996-02-27
申请号：JP19156694
申请日：1994-08-15
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KUWANO SHIGERU , NORIMATSU SEIJI , SHIBATA NOBURU
IPC分类号： H04L1/00
摘要： PURPOSE:To measure the bit error rate of a packet data signal generated in an optional pattern. CONSTITUTION:A reference pattern signal is generated from a data signal information signal and a packet switching information signal and compared with a received data signal outputted from a system to be measured. The generated position of an error bit in one period of packet data is adjusted so as to be set within a connection time of packet and a delayed bit number is adjusted so as to minimize the number of error bits to be counted to set up bit synchronization of a data signal. Thus, the measurement error generated because no bit synchronization is set up is excluded and the bit error rate of the received data signal is measured accurately. The reference pattern signal is generated with simple hardware configuration.

3. 发明专利

JPH0774730A MULTI-FREQUENCY LIGHT SOURCE 失效
公开(公告)号：JPH0774730A
公开(公告)日：1995-03-17
申请号：JP21754093
申请日：1993-09-01
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KUWANO SHIGERU , SHIBATA NOBURU , TOBA HIROSHI , NOSU KIYOSHI
IPC分类号： G02B6/00 , G02B6/42 , H04J14/00 , H04J14/02
摘要： PURPOSE:To attain miniaturization by using a semiconductor laser able to select an optical frequency at a high speed for an optical oscillator. CONSTITUTION:An optical oscillator 10 of a semiconductor laser able to switch an optical frequency at a high speed such as a DFB laser provides an output of lights whose frequency are f1, f2,...,fN sequentially at a switching time T and a period NT based on a control signal outputted from an optical frequency control means 11. The light is branched into N by an optical branch means 12 and an optical delay means 13 gives delay times of 0, T, 2T,..., (N-1) T (or T, 2T, 3T,...,NT) to each branched light. An optical synthesizer 14 synthesizes the lights. Thus, one optical oscillator outputs simultaneously lights of two optical frequencies. Thus, even when the oscillator is mounted on a transmitter in, e.g. an optical path changeover system, since number of optical oscillators is remarkably reduced, the cost is reduced by miniaturization and the reliability is improved.

4. 发明专利

JP2003115842A WIRED/WIRELESS INTEGRATED TYPE TERMINAL DEVICE AND WIRED /WIRELESS INTEGRATED NETWORK 审中-公开
公开(公告)号：JP2003115842A
公开(公告)日：2003-04-18
申请号：JP2001307416
申请日：2001-10-03
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SUZUKI YASUNAO , UEMATSU HITOSHI , KUWANO SHIGERU
IPC分类号： H04L12/02 , H04L12/28 , H04L12/46 , H04M11/00 , H04W28/08 , H04W72/04 , H04W92/04 , H04Q7/38
摘要： PROBLEM TO BE SOLVED: To provide an integrated type terminal device and an integrated type network for mixing a wireless access system and the high speed wired access system such as an optical fiber communication. SOLUTION: The integrated type terminal device has an optical line terminating part (1-3) for terminating a high speed wired line such as optical fiber, wireless line terminating part (1-7) for terminating a radio channel, wired line terminating part (1-5) for terminating a line wired and connected through an interface, and wired/wireless line demultiplexing part (1-4) having functions for transferring data with the optical line terminating part (1-3) and demultiplexing one part of the communication bands of the optical line as a line for wired access and one remaining part as a line for wireless access.

5. 发明专利

JP2002344425A WAVELENGTH-SWITCHING COMMUNICATION APPARATUS AND COMMUNICATION NETWORK SYSTEM 失效
公开(公告)号：JP2002344425A
公开(公告)日：2002-11-29
申请号：JP2001145521
申请日：2001-05-15
申请人： MATSUSHITA COMMUNICATION IND , NIPPON TELEGRAPH & TELEPHONE
发明人： ASANO HIROAKI , FUSE MASARU , UCHIUMI KUNIAKI , KUWANO SHIGERU
IPC分类号： H04J14/00 , H04J3/00 , H04J14/02 , H04J14/08 , H04L12/44
摘要： PROBLEM TO BE SOLVED: To perform high-speed optical communication and band change, in response to requests from users in a communication network system. SOLUTION: An information signal such as a moving image from a server 15 is modulated for each user terminal 13 by different wavelengths by a wave switching communication apparatus 10, is time-division-multiplexed, according to an assigned area for each user terminal on the basis of the control by a band management controlling device 14, and is outputted on an optical fiber F. The optical signal on the optical fiber is demultiplexed by a wavelength router 11 for each wavelength assigned to each user terminal and is transmitted to each user terminal via each terminating device 12.

6. 发明专利

JP2002141927A TRUNK CHANNEL NODE DEVICE, BRANCH CHANNEL NODE DEVICE, OPTICAL ACCESS NETWORK AND CONTENTS DISTRIBUTION METHOD 失效
公开(公告)号：JP2002141927A
公开(公告)日：2002-05-17
申请号：JP2000334684
申请日：2000-11-01
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TOMONOBU KIMITAKA , KUWANO SHIGERU , UEMATSU HITOSHI
IPC分类号： H04B10/27 , H04B10/272 , H04B10/297 , H04B10/299 , H04L12/44 , H04L12/54 , H04L12/58 , H04M3/00 , H04M11/08 , H04B10/20
摘要： PROBLEM TO BE SOLVED: To provide an optical access network configuration, a trunk channel node device, a branch channel node device, and a layout of servers that reduce a new installation cost and quickly promote a broadband service to subscribers at a low cost. SOLUTION: The optical access network is provided with a server that distributes contents on request of a subscriber and an access system transmitter (OLT: Optical Line Terminal) that accommodates a subscriber side device, and the server and the access system transmitter are placed adjacent to each other.

7. 发明专利

JP2003134070A SIGNAL MULTIPLEX TRANSMITTER AND TRANSMITTING METHOD 审中-公开
公开(公告)号：JP2003134070A
公开(公告)日：2003-05-09
申请号：JP2001327894
申请日：2001-10-25
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TANAKA KIYOSHI , KOBAYASHI MASAHIRO , UEMATSU HITOSHI , KUWANO SHIGERU , FUKADA YOICHI
IPC分类号： H04J1/00
摘要： PROBLEM TO BE SOLVED: To realize voice communication of carrier grades and improvement of use efficiency of frequency by using an economical IP system access network and GbE-NIC. SOLUTION: This signal multiplex transmitter is provided with: a frequency division multiplexing means including a means for frequency multiplexing a sub-carrier signal formed by modulating a PCM signal by using sub-carriers on the side of frequency lower than 100 MHz or on the side of frequency higher than 800 MHz and a serial signal of GbE formed by performing 8B/10B encoding, and a means for frequency separating the frequency multiplexed signal into the sub-carrier signal and the serial signal of GbE; and a transmitting/ receiving means including a means for converting a frequency multiplexed electric signal into an optical signal and transmitting the resultant signal to a transmission medium, and a means for converting the optical signal received via the transmitting medium into the electric signal and outputting the resultant signal to the frequency division multiplexing means.

8. 发明专利

JP2003134048A TRANSMISSION CIRCUIT AND WAVEFORM SHAPING CIRCUIT 审中-公开
公开(公告)号：JP2003134048A
公开(公告)日：2003-05-09
申请号：JP2001323328
申请日：2001-10-22
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOBAYASHI MASAHIRO , KUWANO SHIGERU , TANAKA KIYOSHI
IPC分类号： H04B10/40 , H04B10/50 , H04B10/516 , H04B10/54 , H04B10/556 , H04B10/60 , H04B10/61 , H04L27/02 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/142 , H04B10/152 , H04B10/26 , H04B10/28
摘要： PROBLEM TO BE SOLVED: To enable use of components for digital signals which does not have excellent linearlity as a transmission circuit. SOLUTION: The transmission circuit is provided with an AND circuit 31, a laser driver 51, and a laser 7. Amplitude of an angle modulation signal B the angle of which is modulated by a second digital base band signal is modulated by a first digital base band signal A, an amplitude modulation signal C1 is inputted in the laser driver 51 and adjusted at a prescribed level. The laser 7 is driven by an output signal from the laser driver 51 and the amplitude modulation signal is converted into an optical signal D1.

9. 发明专利

JP2000352699A METHOD FOR VARIABLE ATTENUATION OF LIGHT AND VARIABLE OPTICAL ATTENUATOR 失效
公开(公告)号：JP2000352699A
公开(公告)日：2000-12-19
申请号：JP16414499
申请日：1999-06-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HATTORI KUNINORI , GO TAKASHI , JINNO MASAHIKO , KUWANO SHIGERU
IPC分类号： G02B6/122 , G02F1/01
摘要： PROBLEM TO BE SOLVED: To obtain a variable attenuator having small wavelength dependence of waveguide type optical parts by adjusting the phase difference when the signal light passes a second optical interferometer in such a manner that the sum of the differential value of the intensity of the transmitted light for the wavelength in a first optical interferometer and the differential value of the intensity of the transmitted light for the wavelength in the second optical interferometer is zero. SOLUTION: After the phase difference when the signal light passes a first optical interferometer is adjusted, the phase difference when the signal light passes a second optical interferometer is adjusted in such a manner that the sum of the differential value of the intensity of the transmitted light for the wavelength in the first optical interferometer at the center wavelength of the signal light and the differential value of the intensity of the transmitted light for the wavelength in the second optical interferometer is zero. The variable attenuator consists of two Mach-Zehnder interferometers 100A, 100B composed of phase adjusters 104A, 104B and the like. The adjusting amount of the phase by the phase adjuster 104B is controlled by a controlling circuit 109. The controlling circuit 109 controls the adjusting amount of the phase by the phase adjuster 104 in the form of a quadratic function for the adjusted amount of the phase by the phase adjuster 104A.

10. 发明专利

JP2000111411A LIGHT WAVEFORM OBSERVING DEVICE 失效
公开(公告)号：JP2000111411A
公开(公告)日：2000-04-21
申请号：JP28509398
申请日：1998-10-07
申请人： NTT ELECTRONICS CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： KUWANO SHIGERU , FUJISAKI KOICHI , TAKARA HIDEHIKO , YAMABAYASHI YOSHIAKI , SHAKE IPPEI
IPC分类号： G01J9/00
摘要： PROBLEM TO BE SOLVED: To make it possible to observe the signal waveform of several 10 Gb/s without making the signal processing speed high by using light sampling technology by superimposing sampling pulses on a plurality of light signals separated by a light distributing circuit. SOLUTION: The measured input light signal of a high frequency F1 is separated into N pieces (N is an integer of 2 or more) in a light distributing circuit 10. Then, the N pieces of the sampling light pulses, whose timings are deviated separately, are superimposed in optical multiplexers 21-2N. The outputs of these superimposed waveforms are inputted into N pieces of secondary nonlinear mediums 61-6N, and the correlation signal in proportion to the amplitude value of the input signal is outputted. From this output signal, only the correlation- signal component is extracted by optical filters 71-7N and inputted into optical detectors 81-8N. The output signals of the optical detectors 81-8N are amplified to the suitable level in amplifier circuits 91-9N and then converted into the digital signals in AND conversion circuits 101-10N of a sampling frequency fa. Then, the signal is recorded in memory circuits 111-11N.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式